Hydrocarbon-enhanced aluminum thermal lattice for controlled heat flux modulation

Abstract

A thermal management component for a portable temperature-controlled enclosure comprises an aluminum body and a hydrocarbon coating layer. The aluminum body comprises a base surface configured for thermal coupling with a thermoelectric cooling element and a plurality of fin elements extending from the base surface and defining channels therebetween for expanded thermal energy exchange surface area. The hydrocarbon coating layer is disposed on all surfaces of the aluminum body including the fin elements and channels. The coating comprises tetradecane as a thermal control material having a phase transition temperature between 4° C. and 7° C., configured to undergo solid-to-liquid phase transition absorbing latent heat energy when temperature increases and liquid-to-solid phase transition releasing latent heat energy when temperature decreases. The aluminum body conducts and distributes thermal energy from the thermoelectric cooling element across the fin elements during active cooling operation. The hydrocarbon coating layer provides thermal buffering through phase change energy absorption during passive operation when the thermoelectric cooling element is inactive, thereby extending temperature stability duration within a target range of 2° C. to 8° C.

Description

CLAIM OF PRIORITY

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 770,592, filed on Mar. 12, 2025. This provisional patent application is hereby incorporated by reference in its entirety.BACKGROUNDField of the Invention

[0002] The present invention relates generally to thermal management components for portable temperature-controlled storage systems, and more particularly to hydrocarbon-coated aluminum grill structures that provide enhanced heat transfer and thermal buffering capabilities in thermoelectric cooling applications.Background

[0003] Temperature-sensitive materials, particularly in medical and biological applications, require precise temperature control during storage and transport. Portable cooling systems for such applications must maintain consistent temperatures while operating on limited battery power, presenting significant engineering challenges in thermal management efficiency and energy consumption.

[0004] Traditional portable cooling solutions rely on several approaches, each with distinct limitations. Compressor-based refrigeration systems consume substantial electrical power and are impractical for extended battery-powered operation. Passive cooling solutions using ice packs or gel packs cannot maintain precise temperature control over extended periods and require frequent replacement. Phase change material (TCM) systems provide thermal buffering but typically lack active temperature control mechanisms.

[0005] While thermoelectric devices offer solid-state cooling without moving parts or refrigerants, their integration into portable systems presents thermal management challenges. Efficient heat dissipation from the hot side of the thermoelectric element is critical to system performance, while the cold side must effectively transfer cooling energy to the payload chamber.

[0006] Conventional heat exchangers in thermoelectric cooling systems typically comprise aluminum or copper finned structures that rely solely on thermal conduction and convection for heat transfer. These passive heat transfer surfaces lack thermal buffering capacity, resulting in rapid temperature fluctuations when active cooling cycles on and off to conserve battery power. When the thermoelectric element is inactive, temperatures can drift rapidly due to the limited thermal mass of metal fins.

[0007] Additionally, uncoated metal fins in compact portable systems often exhibit thermal gradients and localized hot or cold spots that reduce overall cooling efficiency. The thermal performance of finned heat exchangers is fundamentally limited by the available surface area and the thermal conductivity of the base material. Increasing fin density to expand surface area creates manufacturing challenges and can impede air circulation, while thinner fins may lack structural integrity.

[0008] Phase change materials have been proposed for thermal buffering in refrigeration applications due to their ability to absorb and release substantial latent heat energy during phase transitions. However, integration of TCMs with finned heat exchangers in compact portable devices presents significant technical challenges. Conventional approaches using TCM encapsulation in separate chambers add weight, volume, and complexity while reducing available heat transfer surface area. Mechanical containment of TCMs typically requires additional housing structures that increase thermal resistance between the TCM and the heat exchange surfaces.

[0009] Coating technologies have been applied to heat transfer surfaces for various purposes, including corrosion protection and surface modification. However, conventional coatings are typically applied to alter surface properties such as emissivity or chemical resistance, rather than to provide integrated thermal energy storage. The application of phase change materials as surface coatings on complex geometries such as finned heat exchangers has proven technically challenging, as uniform coating thickness and adequate adhesion are difficult to achieve on vertical fin surfaces and internal channels.

[0010] Furthermore, existing systems often suffer from inefficient thermal coupling between thermoelectric cooling elements and payload chambers. Space constraints in portable systems limit the size and configuration of heat transfer components, making it difficult to achieve both efficient heat dissipation and adequate thermal buffering within compact form factors. The conflicting requirements of maximizing heat transfer surface area, providing thermal energy storage capacity, maintaining structural integrity, and minimizing weight and volume present significant design challenges.

[0011] There exists a need in the art for thermal management components that combine efficient heat transfer with integrated thermal buffering in a compact, lightweight structure suitable for portable thermoelectric cooling applications. Such components should provide enhanced thermal performance compared to conventional uncoated finned heat exchangers while maintaining or reducing system complexity, weight, and manufacturing costs. The present invention addresses these needs by providing a hydrocarbon-coated aluminum grill structure that integrates phase change thermal buffering directly into the heat transfer surface through a polymerized coating process.SUMMARY OF THE INVENTION

[0012] In one aspect, a thermal management component for a portable temperature-controlled enclosure comprises an aluminum body and a hydrocarbon coating layer. The aluminum body comprises a base surface configured for thermal coupling with a thermoelectric cooling element and a plurality of fin elements extending from the base surface and defining a plurality of channels therebetween, wherein the plurality of fin elements are configured to provide an expanded surface area for thermal energy exchange. The hydrocarbon coating layer is disposed on surfaces of the aluminum body including surfaces of the plurality of fin elements and surfaces of the plurality of channels. The hydrocarbon coating layer comprises a thermal control material, wherein the thermal control material comprises tetradecane having a phase transition temperature between 4° C. and 7° C. The hydrocarbon coating layer is configured to undergo solid-to-liquid phase transition absorbing latent heat energy when temperature increases through the phase transition temperature and is configured to undergo liquid-to-solid phase transition releasing latent heat energy when temperature decreases through the phase transition temperature. The aluminum body is configured to conduct thermal energy from the thermoelectric cooling element through the base surface and distribute the thermal energy across the plurality of fin elements during active cooling operation. The hydrocarbon coating layer is configured to provide thermal buffering through phase change energy absorption during passive operation when the thermoelectric cooling element is inactive, thereby extending duration of temperature stability within a target temperature range of 2° C. to 8° C.BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a top view of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0014] FIGS. 2 and 3 are isometric views of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0015] FIG. 4 is a front view of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0016] FIG. 5 is a side view of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0017] FIG. 6-9 illustrate various example views of an aluminum cooling chamber portable unit, according to some embodiments.

[0018] FIG. 6 illustrates a top-view of aluminum cooling chamber portable unit, according to some embodiments.

[0019] FIG. 7 illustrates a isometric-view of aluminum cooling chamber portable unit, according to some embodiments.

[0020] FIG. 8 illustrates a rear-view of aluminum cooling chamber portable unit, according to some embodiments.

[0021] FIG. 9 illustrates a side-view of aluminum cooling chamber portable unit, according to some embodiments.

[0022] FIG. 10 is a block diagram of a sample computing environment that can be utilized to implement various embodiments.

[0023] FIG. 11 illustrates a logical view of a portable temperature-controlled enclosure, according to some embodiments.

[0024] FIG. 12 illustrates an isometric view of a hydrocarbon-coated aluminum grill structure according to one embodiment of the present invention.

[0025] The Figures described above are a representative set and are not an exhaustive with respect to embodying the invention.DESCRIPTION

[0026] Disclosed are a system, method, and article of manufacture for an hydrocarbon-enhanced aluminum thermal lattice for controlled heat flux modulation. The following description is presented to enable a person of ordinary skill in the art to make and use the various embodiments. Descriptions of specific devices, techniques, and applications are provided only as examples. Various modifications to the examples described herein can be readily apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other examples and applications without departing from the spirit and scope of the various embodiments.

[0027] Reference throughout this specification to ‘one embodiment,’‘an embodiment,’‘one example,’ or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, according to some embodiments. Thus, appearances of the phrases ‘in one embodiment,’‘in an embodiment,’ and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.

[0028] Furthermore, the described features, structures, or characteristics of the invention may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art can recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

[0029] The schematic flow chart diagrams included herein are generally set forth as logical flow chart diagrams. As such, the depicted order and labeled steps are indicative of one embodiment of the presented method. Other steps and methods may be conceived that are equivalent in function, logic, or effect to one or more steps, or portions thereof, of the illustrated method. Additionally, the format and symbols employed are provided to explain the logical steps of the method and are understood not to limit the scope of the method. Although various arrow types and line types may be employed in the flow chart diagrams, and they are understood not to limit the scope of the corresponding method. Indeed, some arrows or other connectors may be used to indicate only the logical flow of the method. For instance, an arrow may indicate a waiting or monitoring period of unspecified duration between enumerated steps of the depicted method. Additionally, the order in which a particular method occurs may or may not strictly adhere to the order of the corresponding steps shown.Definitions

[0030] Example definitions for some embodiments are now provided.

[0031] Acrylonitrile butadiene styrene (ABS) is a common plastic polymer.

[0032] High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a polyethylene thermoplastic made from petroleum.

[0033] Phase change material (TCM) is a substance with a high heat of fusion which, melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. Heat is absorbed or released when the material changes from solid to liquid and vice versa. Example TCM materials can include, inter alia: organic (paraffin and nonparaffin), inorganic (salt hydrates and metallic alloys), and eutectic (mixture of two or more TCM components: organic, inorganic, and both).

[0034] Polypropylene (PP) is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene.

[0035] Press fit or friction fit is a fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening.

[0036] Temperature sensors can include mechanical temperature sensors, electrical temperature sensors, integrated circuit sensors, medometers, etc.

[0037] Thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple. A thermoelectric device creates voltage when there is a different temperature on each side. Conversely, when a voltage is applied to it, heat is transferred from one side to the other, creating a temperature difference. At the atomic scale, an applied temperature gradient causes charge carriers in the material to diffuse from the hot side to the cold side.

[0038] Thermal control material (TCM) is a substance capable of storing and releasing thermal energy to regulate temperature. It is noted that TCM can include phase change materials (TCM) such as paraffins, salt hydrates, and eutectic mixtures, thermal mass materials such as water or glycol solutions, and other heat storage media. TCM can include: Phase change materials (TCM) that store energy through phase transitions (e.g., paraffins, salt hydrates, eutectic mixtures); Sensible heat storage materials that store energy through temperature change (e.g., water, glycol solutions, mineral oils, molten salts); Solid thermal mass materials providing thermal inertia (e.g., concrete, ceramic, stone, sand); Metallic thermal buffers with high conductivity (e.g., aluminum heat sinks, copper spreaders, graphite plates, metal foam); and Composite thermal materials combining multiple thermal management functions (e.g., metal matrix composites, polymer-TCM encapsulations, graphene-enhanced compounds).Example Smart Refrigerator Exterior Views

[0039] FIGS. 1-5 provide series of views of an example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. The series of views includes a set of orthographic views (e.g. top, front, side, and isometric) of the portable temperature-controlled enclosure according to one embodiment. The example embodiment of a portable temperature-controlled enclosure 100 can be a top loaded system. Portable temperature-controlled enclosure 100 can include an optimized solid-state cooling system (e.g. see infra). Portable temperature-controlled enclosure 100 provides a portable temperature-controlled enclosure utilizing an innovative solid-state cooling system with optimized thermal management. Portable temperature-controlled enclosure 100 combines advanced thermoelectric cooling technology with control systems to achieve superior temperature stability and extended battery operation.

[0040] Portable temperature-controlled enclosure 100 comprises several key components working in concert: a precision-engineered payload chamber for storing temperature-sensitive materials, an optimized thermoelectric cooling system with angular mounting configuration, an integrated TCM chamber for thermal buffering, and a heat dissipation system including honeycomb ventilation. These components are managed by advanced monitoring and control systems, all supported by extended battery-powered operation capability.

[0041] The top-loading portable temperature-controlled enclosure 100 represents a breakthrough in portable refrigeration technology, utilizing solid-state cooling principles to maintain precise temperature control. The top-loading portable temperature-controlled enclosure 100 distinguishes itself through the complete elimination of traditional cooling infrastructure components such as compressors, refrigerant gases, cooling coils, ice packs, or gel packs.

[0042] Example physical specifications of the top-loading portable temperature-controlled enclosure 100 are now discussed. The top-loading portable temperature-controlled enclosure 100 payload capacity, by way of example, can be a one (1) liter. The top-loading portable temperature-controlled enclosure 100 can include a top-loading design with example dimensions of 107.78 mm×119.92 mm×166.84 mm.

[0043] Access to the top-loading portable temperature-controlled enclosure 100 can be via a top-mounted lid providing full access to internal chamber. Construction of The top-loading portable temperature-controlled enclosure 100 can include precision-engineered aluminum chamber with integrated cooling system.

[0044] An example Core Cooling Technology of the top-loading portable temperature-controlled enclosure 100 is now discussed. The top-loading portable temperature-controlled enclosure 100 employs an advanced solid-state cooling mechanism based on semiconductor physics. As a cooling principle, the top-loading portable temperature-controlled enclosure 100 utilizes an electron mobility differential between semiconductor materials. By way of operation, the top-loading portable temperature-controlled enclosure 100 uses an electric current passage through dual-semiconductor junction.

[0045] The thermal energy absorption during electron transition between materials is implemented to optimizes cooling efficiency. The top-loading portable temperature-controlled enclosure 100 can achieve target temperature (2° C.) within 2-hour initialization period. The top-loading portable temperature-controlled enclosure 100 implements temperature maintenance to maintain 2-8° C. range for 72 hours without external power.

[0046] An example Thermal Management System of the internal payload chamber incorporates a thermal management design. As seen below, the top-loading portable temperature-controlled enclosure 100 includes a chamber construction that includes payload 104. Here, the material composition can include a specialized heat-absorbing material combined with aluminum. The top-loading portable temperature-controlled enclosure 100 utilizes thermal spreading via an engineered aluminum structure for optimal temperature distribution. The top-loading portable temperature-controlled enclosure 100 performs heat absorption via a material matrix for thermal energy management.

[0047] The top-loading portable temperature-controlled enclosure 100 provides dynamic temperature control. Primary cooling is performed via a solid-state semiconductor chip (e.g. discussed infra). Supplementary cooling can be performed via a thermal mass buffer system. Hybrid operation between thermal mass and active cooling Response system can be used for temperature maintenance. Automated cooling bursts for temperature deviation compensation can be performed.

[0048] The top-loading portable temperature-controlled enclosure 100 can include a power and environmental adaptation power system 1102. The top-loading portable temperature-controlled enclosure 100 includes an input compatibility, by way of example of a Universal AC power (110V / 220V) and an integrated charging system. Battery operation can be for 72-hour autonomous operation capability.

[0049] Optimized power consumption during steady-state operation can be obtained using bi-directional temperature control capability. For example, in a winter mode operation, the top-loading portable temperature-controlled enclosure 100 functions in extreme cold environments (−20° C. to −30° C.). Thermal management systems 1104 of the top-loading portable temperature-controlled enclosure 100 can maintains 2-8° C. in both hot and cold ambient conditions. An example environmental range enables The top-loading portable temperature-controlled enclosure 100 to be functional across extreme temperature variations.

[0050] The top-loading portable temperature-controlled enclosure 100 includes a monitoring and communication system 1106 for temperature monitoring. Real-time temperature tracking is implemented across continuous internal temperature measurement. The top-loading portable temperature-controlled enclosure 100 includes a digital display for current temperature indication. The top-loading portable temperature-controlled enclosure 100 includes an alert system for temperature deviations. The top-loading portable temperature-controlled enclosure 100 includes a communication infrastructure 1108 that can include an integrated LTE module with SIM card and / or GPS location tracking capability. The top-loading portable temperature-controlled enclosure 100 can perform data transmission intervals (e.g. at 4-5 minutes. The top-loading portable temperature-controlled enclosure 100 also includes cloud connectivity for remote monitoring. A backup SD card storage system can be included for offline data logging. The top-loading portable temperature-controlled enclosure 100 includes a Data Management module 1110 for continuous temperature logging and location tracking and recording. The top-loading portable temperature-controlled enclosure 100 can also perform automated cloud data synchronization.

[0051] The top-loading portable temperature-controlled enclosure 100 includes an Operation and Performance Temperature Performance module that manages an initial cooldown (e.g. 2 hours to reach target temperature with a temperature range: 2-8° C. maintenance and operation duration of 72 hours on battery power).

[0052] A thermal interface material utilizes a high thermal conductivity compound with controlled thickness application and full surface coverage verification. Mounting pressure can be maintained at 30-40 PSI through a spring-loaded mechanism, ensuring even pressure distribution across the chip surface and compensation for thermal expansion and contraction in some example embodiments.

[0053] The top-loading configuration represents a significant advancement in portable temperature-controlled storage, combining innovative solid-state cooling technology with thermal management and monitoring systems. The design achieves exceptional efficiency and reliability while maintaining precise temperature control across varied environmental conditions.

[0054] More specifically, FIG. 1 is a top view of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. FIGS. 2 and 3 are isometric views of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. FIG. 4 is a front view of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. FIG. 5 is a side view of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments.

[0055] In one embodiments, portable temperature-controlled enclosure 100 can have a top-loading configuration with example payload dimensions: 3.2″×4.1″×5.5″. An example top opening capacity can be one (1) liter. Overall dimensions, by way of example, can be 107.78 mm×119.92 mm×166.84 mm. Portable temperature-controlled enclosure 100 provides a top access lid for payload (e.g. medications, etc.) insertion.

[0056] FIG. 6-9 illustrate various example views of an aluminum cooling chamber portable unit 200, according to some embodiments. Aluminum cooling chamber portable unit 200 can be the internal cooling / heating system of portable temperature-controlled enclosure 100.

[0057] Aluminum cooling chamber portable unit 200 of portable temperature-controlled enclosure 100 comprises a thermoelectric cooling mechanism wherein electrical power is transmitted through a strategically positioned semiconductor chip 202 mounted at a calculated angular orientation relative to the aluminum payload chamber 204. The semiconductor chip 202 incorporates a material combination wherein electrons traverse between different semiconductor elements, creating an energy absorption effect at the material junction interfaces. This energy absorption phenomenon, occurring at the precise locations where the material composition transitions, facilitates the cooling process through electron mobility differentials between the semiconductor materials.

[0058] The thermal management system utilizes direct thermal coupling between the semiconductor chip 202 and an aluminum payload chamber 204, whereby the energy absorption at the material junctions actively extracts heat from the payload area through the aluminum wall interface. The extracted thermal energy is subsequently transferred to a closed-loop cooling system 206 comprising fluid-carrying pipes 208 directly coupled to the posterior surface of the semiconductor chip (e.g. can include a heat sink system). The cooling loop 206 employs either water or antifreeze as the working fluid, circulating through an engineered pipe network via an integrated pump mechanism.

[0059] The system's thermal circuit can be completed through a fan-assisted heat exchanger configuration 214, wherein the heated working fluid from the cooling loop 206 is actively cooled before being recirculated through the system. The angular mounting of the semiconductor chip, deliberately oriented at a calculated angle rather than perpendicular to the payload chamber, achieves enhanced cooling distribution by optimizing the radius of coolness spread and increasing the effective surface area coverage. This angular configuration demonstrably improves the speed and uniformity of temperature distribution compared to traditional perpendicular mounting arrangements.

[0060] The thermal control system can operate in a dual-power configuration, initially utilizing wall power for the cooldown phase until the target temperature (typically 2° C.) is achieved, at which point the system transitions to battery power through a lithium polymer battery assembly capable of maintaining temperature control for 72 hours of autonomous operation. The internal configuration includes various top-loading variants (e.g. via top opening 212, etc.) while maintaining identical operational principles, with the semiconductor chip positioning optimized for each configuration to maximize cooling efficiency through enhanced radial distribution patterns.

[0061] The angular orientation of the semiconductor chip 202 relative to the payload chamber wall facilitates superior thermal spreading characteristics. The cooling effect disperses in a radial pattern rather than traditional linear distribution, resulting in more efficient coverage of the payload surface area and accelerated temperature equalization throughout the chamber. This geometric optimization of the semiconductor chip 202 placement enables the system to achieve more comprehensive thermal coverage compared to conventional perpendicular mounting configurations, as the angular positioning creates an expanded radius of cooling influence that enhances the overall heat absorption efficiency of the system.

[0062] More specifically, FIG. 6 illustrates a top-view of aluminum cooling chamber portable unit 200, according to some embodiments. FIG. 7 illustrates a isometric-view of aluminum cooling chamber portable unit 200, according to some embodiments. FIG. 8 illustrates a rear-view of aluminum cooling chamber portable unit 200, according to some embodiments. FIG. 9 illustrates a side-view of aluminum cooling chamber portable unit 200, according to some embodiments.Example Computer Architecture and Systems

[0063] FIG. 10 depicts an exemplary computing system 1000 that can be configured to perform any one of the processes provided herein. In this context, computing system 1000 may include, for example, a processor, memory, storage, and I / O devices (e.g., monitor, keyboard, disk drive, Internet connection, etc.). However, computing system 1000 may include circuitry or other specialized hardware for carrying out some or all aspects of the processes. In some operational settings, computing system 1000 may be configured as a system that includes one or more units, each of which is configured to carry out some aspects of the processes either in software, hardware, or some combination thereof.

[0064] FIG. 10 depicts computing system 1000 with a number of components that may be used to perform any of the processes described herein. The main system 1002 includes a motherboard 1004 having an I / O section 1006, one or more central processing units (CPU) 1008, and a memory section 1010, which may have a flash memory card 1012 related to it. The I / O section 1006 can be connected to a display 1014, a keyboard and / or other user input (not shown), a disk storage unit 1016, and a media drive unit 1018. The media drive unit 1018 can read / write a computer-readable medium 1020, which can contain programs 1022 and / or data. Computing system 1000 can include a web browser. Moreover, it is noted that computing system 1000 can be configured to include additional systems in order to fulfill various functionalities. Computing system 1000 can communicate with other computing devices based on various computer communication protocols such a Wi-Fi, Bluetooth® (and / or other standards for exchanging data over short distances includes those using short-wavelength radio transmissions), USB, Ethernet, cellular, an ultrasonic local area communication protocol, etc.

[0065] Thermo-electric cooler pump can be managed by a computing system in the portable smart refrigerator. The computing system can be coupled with an exterior display. Exterior display can display various parameters (e.g. temperature, batter power, etc.) of the portable smart refrigerator. Computing system can also be coupled with various other systems such as, inter alia: temperature sensors, digital clocks, Wi-Fi systems, etc.

[0066] FIG. 11 illustrates a logical view 1100 of a portable temperature-controlled enclosure, according to some embodiments. Power and environmental adaptation power system 1102. The top-loading portable temperature-controlled enclosure 100 includes an input compatibility, by way of example of a Universal AC power (110V / 220V) and an integrated charging system. Thermal management systems 1104 manage the temperature of top-loading portable temperature-controlled enclosure 100. Thermal management systems 110 of the top-loading portable temperature-controlled enclosure 100 can maintain 2-8° C. in both hot and cold ambient conditions. Monitoring and communication system 1106 for temperature monitoring. Real-time temperature tracking is implemented across continuous internal temperature measurement. The top-loading portable temperature-controlled enclosure 100 includes a digital display for current temperature indication. The top-loading portable temperature-controlled enclosure 100 includes an alert system for temperature deviations. The top-loading portable temperature-controlled enclosure 100 includes a communication infrastructure 1108 that can include an integrated LTE module with SIM card and / or GPS location tracking capability. The top-loading portable temperature-controlled enclosure 100 can perform data transmission intervals (e.g. at 4-5 minutes. The top-loading portable temperature-controlled enclosure 100 also includes cloud connectivity for remote monitoring. A backup SD card storage system can be included for offline data logging. The top-loading portable temperature-controlled enclosure 100 includes a Data Management module 1110 for continuous temperature logging and location tracking and recording.

[0067] Additional information on chip positioning is now discussed. The innovative cooling system centers around a precisely engineered 40 mm×40 mm semiconductor chip that represents a significant advancement in portable refrigeration technology. This chip, comprising multiple semiconductor junctions arranged in an optimized pattern, is mounted at a carefully calculated 20-degree angle relative to the payload chamber wall, deviating from traditional perpendicular mounting approaches. This specific angular orientation was chosen to maximize the cooling efficiency through enhanced radial distribution patterns.

[0068] The mounting configuration creates a thermal management system where the chip interfaces directly with the aluminum chamber wall for maximum thermal conductivity. This direct coupling is maintained by a spring-loaded mechanism that ensures a consistent 30-40 PSI mounting pressure, crucial for optimal heat transfer. The interface between the chip and wall utilizes a high thermal conductivity compound with carefully controlled thickness and verified full surface coverage.

[0069] The 20-degree mounting angle serves a critical purpose in the system's operation. Unlike conventional perpendicular mounting, which typically results in linear cooling distribution, this angular orientation creates an expanded radius of cooling influence. This radial distribution pattern enables more comprehensive coverage of the payload surface area and facilitates faster temperature equalization throughout the chamber. The result is a more efficient and effective cooling system that achieves superior thermal coverage compared to traditional mounting configurations.

[0070] In the top-loaded configuration, the chip is positioned lower, near the midsection of the wall, with the temperature sensor strategically placed inside the payload wall towards the bottom side. This positioning was specifically chosen to optimize the cooling effect in relation to the temperature sensor location. The entire setup demonstrates a carefully engineered approach to thermal management, where each component's position has been optimized for maximum efficiency.

[0071] The semiconductor chip's design and mounting create a cooling effect that disperses in a radial pattern rather than a traditional linear distribution. This radial dispersion is particularly effective because it provides more uniform coverage across the payload area. The angular mounting effectively increases the total area over which the cooling effect spreads, resulting in more efficient temperature control throughout the chamber. This innovative approach to chip mounting and cooling distribution represents a significant advancement in portable refrigeration technology, offering improved performance over conventional perpendicular mounting systems.

[0072] The system's overall design reflects a deep understanding of thermal dynamics and practical engineering considerations. By combining the precise 40 mm×40 mm chip dimensions with the 20-degree mounting angle and strategic positioning relative to temperature sensors, the system achieves optimal cooling performance while maintaining efficient use of space within the portable unit. The careful attention to mounting pressure, thermal compound application, and interface design ensures reliable and consistent performance, making this cooling system particularly well-suited for portable applications requiring precise temperature control.Detailed Description of an Example Hydrocarbon-Coated Aluminum Grill

[0073] The hydrocarbon-coated aluminum grill comprises a finned heat transfer component configured for enhanced thermal management in portable temperature-controlled systems. The grill structure facilitates bidirectional thermal energy transmission through both active cooling distribution and passive heat absorption mechanisms.

[0074] Structure and Dimensional Specifications are now discussed by way of example. The grill structure comprises an aluminum body having a wall thickness of approximately 0.71 millimeters. In one embodiment, the aluminum body comprises a 6000-series aluminum alloy, selected for its favorable combination of thermal conductivity, formability, and corrosion resistance. The overall mass of the assembled grill structure is approximately 0.67 kilograms.

[0075] The grill structure includes a plurality of fins extending from a base surface. In the illustrated embodiment, the plurality of fins comprises approximately ten discrete fin elements, each fin element having substantially uniform dimensional characteristics. The fins are arranged in a substantially parallel configuration to define a grid-like thermal exchange structure that maximizes available surface area for heat transfer while maintaining mechanical rigidity sufficient to withstand operational stresses.

[0076] Each fin element extends perpendicularly or near-perpendicularly from the base surface, creating a plurality of channels therebetween. These channels permit fluid circulation, whether air or liquid coolant, to facilitate convective heat transfer across the expanded surface area provided by the fin geometry.

[0077] Hydrocarbon Coating Composition and Application are now discussed by way of example. The aluminum surfaces of the grill structure, including the base surface, fin elements, and channel surfaces, are treated with a hydrocarbon coating layer. In one embodiment, the hydrocarbon coating comprises tetradecane (C14H30), a saturated hydrocarbon selected for its phase change thermal properties and coating compatibility with aluminum substrates.

[0078] The hydrocarbon coating is applied through a polymerization process that chemically bonds the hydrocarbon material to the aluminum substrate surfaces. In one embodiment, the polymerization process comprises surface preparation of the aluminum substrate through cleaning and optional anodization to create a receptive surface chemistry, application of the hydrocarbon material in liquid phase, and controlled heating to induce polymerization reactions that crosslink the hydrocarbon molecules and bond them to the aluminum oxide layer.

[0079] The resulting hydrocarbon coating exhibits a substantially uniform thickness across all treated surfaces, including the complex geometries of the fin elements. The coating uniformity ensures consistent thermal performance characteristics throughout the grill structure. The hydrocarbon coating serves multiple thermal management functions: providing a thermal storage medium through phase change material properties, enhancing thermal conductivity across the aluminum-to-environment interface, and facilitating more uniform temperature distribution across the grill structure.

[0080] In alternative embodiments, the aluminum substrate may undergo additional surface treatments prior to hydrocarbon coating application. Such treatments may include anodization to increase surface area at the microscopic level, sand blasting to create surface roughness that enhances both coating adhesion and thermal transfer characteristics, or both. The combination of anodized and sand-blasted aluminum surfaces with the polymerized hydrocarbon coating has been observed to provide superior thermal conduction properties compared to untreated aluminum or coating-only approaches.

[0081] Thermal Interface Configuration is now discussed. The grill structure is configured to interface with a thermoelectric cooling element through a mounting surface located on a posterior portion of the grill structure. In one embodiment, the cooling element mounts substantially vertically along a back face of the grill structure, creating direct thermal communication between the thermoelectric device and the hydrocarbon-coated aluminum body.

[0082] This mounting configuration establishes a bidirectional thermal pathway whereby cooling energy generated by the thermoelectric element is transmitted through the aluminum body and distributed across the expanded surface area provided by the fins and hydrocarbon coating. Simultaneously, thermal energy from the surrounding environment or payload chamber is absorbed by the hydrocarbon coating, conducted through the aluminum substrate, and transferred to the thermoelectric element for removal from the system.

[0083] The vertical mounting orientation of the cooling element relative to the grill structure optimizes thermal performance by minimizing thermal resistance path length between the thermoelectric junction and the primary heat exchange surfaces, facilitating natural convection currents along the fin channels, and enabling efficient integration within compact portable enclosure geometries.

[0084] Thermal Performance Characteristics are now discussed. The hydrocarbon-coated aluminum grill exhibits enhanced thermal management performance compared to conventional uncoated finned heat exchangers. The grid-like fin pattern maximizes surface area available for thermal exchange while the hydrocarbon coating provides additional thermal mass and phase-change thermal buffering. This combination enables the grill structure to both rapidly distribute cooling effects during active refrigeration and absorb thermal loads to maintain temperature stability during passive operation.

[0085] The structural configuration of the grill, with its precisely dimensioned fins and optimized grid spacing, maintains mechanical integrity under operational conditions while providing sufficient open area for fluid circulation. The 0.71 millimeter wall thickness represents a balance between maximizing thermal conductivity, which favors thinner walls, and ensuring adequate structural strength for handling and operational durability, which favors thicker walls.

[0086] The grill structure may be implemented as an integrated component within various portable temperature-controlled enclosure configurations, including but not limited to top-loading refrigeration units, side-loading cooling chambers, cylindrical thermal storage vessels, and modular multi-chamber systems. The modular nature of the grill design enables scalability across different payload volumes and cooling capacity requirements.

[0087] Integration within Broader Thermal Management System is now discussed. While the hydrocarbon-coated aluminum grill represents a discrete component with independent inventive merit, it functions as an integral element within a comprehensive portable refrigeration system. The grill interfaces with other system components including the thermoelectric cooling element, payload chamber, insulative enclosure materials, and control electronics. The synergistic combination of these elements, with the grill serving as a critical thermal interface and distribution component, enables the overall system to achieve precise temperature control with extended battery-powered operation.

[0088] In operation, the grill structure receives cooling energy from the thermoelectric element through direct thermal conduction. The aluminum body rapidly distributes this cooling energy across its surface area, while the hydrocarbon coating absorbs and stores thermal energy through phase change mechanisms. The fin geometry expands the effective surface area exposed to the payload chamber or ambient environment, enabling efficient thermal exchange. The bidirectional thermal management capability, which simultaneously cools through active thermoelectric operation and absorbs heat through passive phase change materials, enables the system to maintain stable temperatures with reduced active cooling duty cycles, thereby extending battery life and improving overall energy efficiency.

[0089] The thermal management system further incorporates a hydrocarbon-coated aluminum grill structure that interfaces with the thermoelectric cooling element to enhance heat transfer efficiency and provide integrated thermal buffering. This grill structure, positioned between the semiconductor chip 202 and the payload chamber 204, comprises a finned aluminum body with a polymerized hydrocarbon coating applied to all surfaces including the base surface, fin elements, and internal channels. The grill serves dual thermal management functions: actively distributing cooling energy from the thermoelectric element across an expanded surface area during powered operation, and passively absorbing and storing thermal energy through phase change mechanisms during unpowered periods. This bidirectional thermal capability extends the system's temperature stability during battery-powered operation by reducing the duty cycle requirements of the thermoelectric cooling element.

[0090] The hydrocarbon-coated grill integrates into the overall thermal circuit of the portable temperature-controlled enclosure 100 by providing an enhanced thermal interface between the active cooling components and the payload chamber. The aluminum body of the grill conducts thermal energy efficiently due to aluminum's high thermal conductivity, while the hydrocarbon coating layer-comprising tetradecane in one embodiment-undergoes phase transitions at temperatures within the target 2-8° C. operating range. The tetradecane coating, with a phase transition temperature of approximately 5.5° C., absorbs latent heat energy during solid-to-liquid transitions and releases thermal energy during liquid-to-solid transitions, creating a thermal buffering effect that stabilizes payload chamber temperatures.

[0091] During cooldown phases, the thermoelectric element 202 transfers cooling energy through the grill structure, which distributes this cooling across its finned geometry to the surrounding payload chamber 204. The grill's fin configuration, comprising approximately ten discrete fin elements arranged in a grid-like pattern, maximizes the available surface area for thermal exchange while maintaining structural integrity within the compact enclosure geometry. The fin elements extend perpendicularly from a base surface that mounts to the posterior face of the thermoelectric cooling element, creating direct thermal communication between the semiconductor chip junction and the hydrocarbon-coated aluminum surfaces. This direct thermal coupling minimizes thermal resistance in the heat transfer pathway, enabling rapid temperature response during active cooling cycles.

[0092] During passive operation when the thermoelectric element is inactive, the phase change properties of the hydrocarbon coating provide thermal buffering that slows temperature drift within the payload chamber. As ambient thermal energy infiltrates the insulated enclosure, the hydrocarbon coating absorbs this heat through endothermic phase transition rather than allowing rapid temperature increase. This passive thermal management extends the duration between active cooling cycles, thereby enabling the system to maintain the 72-hour autonomous operation capability with reduced active cooling duty cycles and optimized battery consumption. The combination of high thermal conductivity aluminum substrate with phase-change hydrocarbon coating creates a hybrid active-passive thermal management system that improves upon conventional uncoated metal heat exchangers.

[0093] In alternative embodiments of the portable temperature-controlled enclosure 100, the hydrocarbon-coated grill may be configured with varying fin geometries, coating thicknesses, or surface treatments to optimize performance for different payload volumes or operating temperature ranges. For instance, the aluminum substrate may undergo anodization prior to hydrocarbon coating application to increase microscopic surface area and enhance coating adhesion, or sand blasting to create surface roughness that improves thermal conduction at the aluminum-hydrocarbon interface. The modular nature of the grill component enables integration into various enclosure configurations including the top-loading design illustrated in FIGS. 1-5, side-loading variants, cylindrical payload chambers, or scaled implementations for larger payload capacities such as 12-liter or 42-liter systems, while maintaining the core thermal management principles of combined active heat transfer and passive phase-change buffering.

[0094] FIG. 12 illustrates an isometric view of a hydrocarbon-coated aluminum grill structure 1200 according to one embodiment of the present invention. The grill structure 1200 comprises a thermal management component configured to interface with a thermoelectric cooling element and provide enhanced heat transfer and thermal buffering capabilities within a portable temperature-controlled enclosure system.

[0095] The grill structure 1200 comprises an aluminum body having multiple integrated structural elements that collectively provide optimized thermal performance. The overall configuration presents a substantially rectangular box-like geometry with an open front face oriented toward the payload chamber and a closed posterior mounting surface 1206 configured for direct thermal coupling with the thermoelectric cooling element.

[0096] The upper portion of the grill structure 1200 includes a plurality of fin elements 1202 extending upward from a base surface in a stepped or staggered parallel arrangement. In the illustrated embodiment, the fin elements 1202 are arranged in a substantially parallel configuration, with each fin element extending along the length dimension of the grill structure 1200. The stepped configuration of the fin elements 1202 creates multiple levels or tiers, providing increased surface area for thermal exchange while maintaining structural stability. Each fin element 1202 defines a channel between adjacent fins, permitting fluid circulation—whether ambient air or circulated coolant—to facilitate convective heat transfer across the expanded surface area provided by the fin geometry.

[0097] The lateral walls of the grill structure 1200 feature grid-like structural patterns 1204 comprising a lattice or mesh arrangement of aluminum material. This grid configuration 1204 serves multiple functional purposes within the thermal management system. First, the grid pattern maximizes available surface area for thermal exchange by creating numerous edges and surfaces exposed to the surrounding environment or payload chamber. Second, the open grid structure permits fluid circulation through the grill assembly, allowing air or coolant to flow through the interior spaces and contact the internal surfaces of the grill structure. Third, the grid pattern maintains mechanical rigidity and structural integrity sufficient to withstand operational stresses, handling during assembly, and thermal cycling effects, while simultaneously reducing the overall mass of the component compared to solid-walled alternatives.

[0098] The grid pattern 1204 comprises a regular array of rectangular or square apertures defined by intersecting horizontal and vertical aluminum members. The thickness of these structural members corresponds to the overall wall thickness of the grill structure 1200, which in one embodiment is approximately 0.71 millimeters. This dimensioning represents an optimized balance between maximizing thermal conductivity through the aluminum substrate, which favors thinner walls for reduced thermal resistance, and ensuring adequate structural strength for handling and operational durability, which favors thicker walls for enhanced mechanical properties.

[0099] The posterior mounting surface 1206 comprises a substantially planar face configured for direct thermal communication with the thermoelectric cooling element. In the illustrated embodiment, the mounting surface 1206 presents a smooth, continuous surface suitable for achieving intimate thermal contact with the hot side or cold side of a thermoelectric device. The mounting surface 1206 may include mounting features such as threaded holes, alignment pins, or attachment points (not shown in FIG. 12) to facilitate secure mechanical coupling with the thermoelectric element. In operation, the mounting surface 1206 receives thermal energy through direct conduction from the thermoelectric junction, which energy is then distributed throughout the aluminum body of the grill structure 1200 via the high thermal conductivity of the aluminum substrate.

[0100] The interior cavity of the grill structure 1200, visible through the open front face and grid apertures 1204, provides space for thermal energy distribution and accommodation of the payload chamber when the grill is integrated into the complete portable temperature-controlled enclosure system. The open front orientation allows the grill structure 1200 to surround or interface with the payload chamber, creating thermal communication between the hydrocarbon-coated surfaces and the temperature-sensitive materials stored within the payload volume.

[0101] While not visible in FIG. 12 due to the nature of the coating application, all exposed surfaces of the grill structure 1200—including the fin elements 1202, the grid-pattern walls 1204, the mounting surface 1206, the base surface, and all internal channel surfaces—are treated with a hydrocarbon coating layer. In one embodiment, this hydrocarbon coating comprises tetradecane (C14H30) applied through a polymerization process that chemically bonds the hydrocarbon material to the aluminum substrate. The coating exhibits substantially uniform thickness across all treated surfaces, including the complex geometries of the fin elements 1202 and the grid apertures 1204.

[0102] The hydrocarbon coating serves multiple thermal management functions within the grill structure 1200. During active cooling operation, when the thermoelectric element transfers cooling energy through the mounting surface 1206, the aluminum body rapidly conducts this thermal energy throughout its structure, distributing cooling across the fin elements 1202 and grid walls 1204. The hydrocarbon coating facilitates this cooling distribution by providing enhanced thermal coupling with the surrounding air or fluid medium. During passive operation, when the thermoelectric element is inactive, the hydrocarbon coating undergoes phase transitions in response to temperature fluctuations. As ambient thermal energy infiltrates the system, the hydrocarbon material absorbs heat through endothermic solid-to-liquid phase transition, providing thermal buffering that slows temperature drift within the payload chamber. This phase change mechanism stores latent heat energy within the coating material, extending the duration of temperature stability without requiring active cooling.

[0103] The dimensional specifications of the grill structure 1200 illustrated in FIG. 12 represent one embodiment optimized for integration with a one-liter payload capacity portable temperature-controlled enclosure. In this embodiment, the grill structure 1200 has an overall mass of approximately 0.67 kilograms, including both the aluminum substrate and the applied hydrocarbon coating. The fin elements 1202 comprise approximately ten discrete fins, though alternative embodiments may incorporate different fin counts, fin heights, fin spacing, or fin configurations to optimize performance for different payload volumes, operating temperature ranges, or cooling capacity requirements.

[0104] The modular nature of the grill structure 1200 enables integration into various portable temperature-controlled enclosure configurations. The mounting surface 1206 may be oriented vertically along the back of a payload chamber, horizontally beneath a payload platform, or at angular orientations to accommodate different enclosure geometries. The grid-like walls 1204 may be configured with varying aperture sizes, aperture patterns, or wall thicknesses to adjust the balance between surface area maximization, structural strength, weight reduction, and fluid circulation characteristics. The fin elements 1202 may be arranged in alternative geometric patterns such as radial configurations, concentric arrangements, or asymmetric distributions to optimize thermal performance for specific applications.

[0105] In alternative embodiments, the aluminum substrate of the grill structure 1200 may undergo additional surface treatments prior to hydrocarbon coating application. Such treatments may include anodization to create a micro-porous aluminum oxide layer that increases effective surface area and enhances coating adhesion, sand blasting or bead blasting to create controlled surface roughness that improves thermal transfer characteristics at the aluminum-hydrocarbon interface, or chemical etching to modify surface chemistry for improved coating bonding. These surface treatments, combined with the polymerized hydrocarbon coating, create a multi-layer thermal interface that exhibits superior performance compared to untreated aluminum or coating-only approaches.

[0106] Integration of Hydrocarbon-Coated Aluminum Grill Structure with System Components is now discussed. The hydrocarbon-coated aluminum grill structure 1200 illustrated in FIG. 12 integrates directly into the thermal management architecture of the portable temperature-controlled enclosure 100 shown in FIGS. 1-11. Specifically, the grill structure 1200 forms a critical thermal interface component positioned between the semiconductor chip 202 and the aluminum payload chamber 204 within the aluminum cooling chamber portable unit 200. The mounting surface 1206 of the grill structure 1200 establishes direct thermal communication with the semiconductor chip 202. In the assembled configuration, the mounting surface 1206 contacts the cold side of the semiconductor chip 202, receiving cooling energy generated by the thermoelectric junction. This direct thermal coupling is maintained through a thermal interface material that ensures intimate contact between the chip 202 and the mounting surface 1206, minimizing thermal resistance in the heat transfer pathway. The semiconductor chip 202, which is mounted at a calculated angular orientation such as 20 degrees relative to the payload chamber wall, transfers its cooling energy into the aluminum body of the grill structure 1200. The grill structure 1200 interfaces with the aluminum payload chamber 204 through its open front face and exposed fin elements 1202. In one embodiment, the grill structure 1200 surrounds or partially encloses the payload chamber 204, positioning the fin elements 1202 and grid-pattern walls 1204 in close proximity to the exterior surfaces of the payload chamber 204. This configuration enables thermal energy exchange between the hydrocarbon-coated surfaces of the grill 1200 and the payload chamber 204, which stores temperature-sensitive materials such as medications or biological samples. The channels between fin elements 1202 permit air circulation around the payload chamber 204, facilitating convective heat transfer. In alternative embodiments, the grill structure 1200 may be integrated as a structural component of the aluminum payload chamber 204 itself, wherein the payload chamber walls incorporate the fin elements 1202 and grid patterns 1204 as integral features. In such configurations, the interior cavity of the grill structure 1200 visible in FIG. 12 would define the payload storage volume directly, eliminating the need for a separate payload chamber component. The hydrocarbon coating would thus be applied to both the interior surfaces in contact with stored materials and exterior surfaces in contact with ambient environment or insulation of the integrated grill-chamber structure. The grill structure 1200 functions within the complete thermal circuit established by the aluminum cooling chamber portable unit 200. During cooldown operation, electrical power supplied to the semiconductor chip 202 generates a temperature differential across the chip junction. The cold side of the chip 202 transfers cooling energy through the mounting surface 1206 into the aluminum body of the grill structure 1200. The high thermal conductivity of the aluminum substrate rapidly distributes this cooling energy throughout the grill structure 1200, including the fin elements 1202, grid walls 1204, and base surfaces. The hydrocarbon coating on these surfaces absorbs cooling energy and transfers it to the surrounding payload chamber 204 or directly to stored materials. Simultaneously, the hot side of the semiconductor chip 202 transfers waste heat into the closed-loop cooling system 206 comprising fluid-carrying pipes 208. The cooling loop 206 circulates water or antifreeze working fluid through the fan-assisted heat exchanger configuration 214, removing waste heat from the system. This coordinated operation—with the grill structure 1200 distributing cooling on the cold side while the cooling loop 206 removes heat from the hot side—enables the portable temperature-controlled enclosure 100 to achieve and maintain target temperatures in the 2-8° C. range. During passive operation when the semiconductor chip 202 is inactive to conserve battery power, the grill structure 1200 continues to provide thermal management through the phase change properties of its hydrocarbon coating.

[0107] As ambient thermal energy infiltrates through the insulation of the portable temperature-controlled enclosure 100 and begins to warm the payload chamber 204, the tetradecane coating on the grill structure 1200 undergoes solid-to-liquid phase transition. This endothermic phase change absorbs thermal energy that would otherwise raise the temperature of materials stored in the payload chamber 204, thereby extending the duration of temperature stability between active cooling cycles. This passive thermal buffering capability contributes directly to the system's ability to maintain the 2-8° C. temperature range for 72 hours of autonomous operation on battery power. The modular design of the grill structure 1200 enables its integration into various configurations of the portable temperature-controlled enclosure 100. In the top-loading configuration illustrated in FIGS. 1-5, the grill structure 1200 may be oriented with the mounting surface 1206 positioned vertically along a back or side wall of the payload chamber 204, with the fin elements 1202 extending upward to maximize convective heat transfer. In alternative side-loading or cylindrical configurations, the grill structure 1200 may be repositioned or replicated to provide thermal management from multiple directions around the payload chamber 204. The scalability of the grill design permits implementation in larger capacity systems such as 12-liter or 42-liter enclosures through dimensional scaling or deployment of multiple grill structures 1200 interfacing with correspondingly sized or multiple semiconductor chips 202.

[0108] Key Inventive Aspects of the Hydrocarbon-Coated Aluminum Grill are now discussed. The hydrocarbon-coated aluminum grill structure 1200 embodies several inventive aspects that distinguish it from conventional heat exchange components in portable refrigeration systems. These innovations address long-standing technical challenges in thermal management for battery-powered temperature-controlled storage applications.

[0109] Integrated Phase Change Coating on Finned Heat Exchanger is now discussed. A primary inventive aspect comprises the integration of a polymerized hydrocarbon coating as a phase change material directly onto the surfaces of a finned aluminum heat exchanger structure. The hydrocarbon coating, comprising tetradecane in one embodiment, is applied uniformly across all surfaces of the aluminum finned structure including the fin elements 1202, base surfaces, channels between fins, and grid-pattern walls 1204. This integration combines active heat transfer through the high thermal conductivity of the aluminum substrate with passive thermal buffering through the phase change properties of the hydrocarbon coating in a single unified component.

[0110] Conventional thermal management systems employ either uncoated metal fins that provide heat transfer through conduction and convection but lack thermal energy storage capacity, or alternatively utilize separate phase change material chambers that add thermal buffering but increase system weight, volume, and complexity while reducing available heat transfer surface area. The integration of the phase change material directly onto the heat exchanger surfaces through polymerization eliminates the need for separate Thermal control material encapsulation chambers, maintaining full heat transfer surface area while simultaneously adding thermal storage capacity. This approach solves the technical challenge of achieving uniform coating thickness on complex three-dimensional geometries including vertical fin surfaces, internal channels, and grid apertures where conventional coating methods typically produce non-uniform coverage or inadequate adhesion.

[0111] The polymerization process chemically bonds the hydrocarbon molecules to the aluminum substrate, creating a durable coating that withstands repeated thermal cycling between solid and liquid phases without delamination or degradation. The coating remains functional through hundreds or thousands of phase transition cycles as the portable temperature-controlled enclosure alternates between active cooling and passive thermal buffering modes. This durability represents a significant advancement over mechanical Thermal control material encapsulation methods where repeated phase changes can cause material fatigue, encapsulation failure, or separation between the Thermal control material and heat transfer surfaces.

[0112] Tetradecane Selection for Target Operating Temperature Range is now discussed. A second inventive aspect comprises the selection of tetradecane as the hydrocarbon coating material for portable refrigeration systems operating in the 2-8° C. temperature range required for pharmaceutical and biological material storage. Tetradecane exhibits a phase transition temperature of approximately 5.5° C., positioning this transition point within the target operating range where thermal buffering provides maximum operational benefit.

[0113] During system operation, when ambient thermal energy infiltrates the insulated enclosure and begins to raise the payload chamber temperature above the lower threshold of approximately 2° C., the tetradecane coating undergoes endothermic solid-to-liquid phase transition as it approaches and passes through 5.5° C. This phase change absorbs substantial latent heat energy—significantly more energy than would be absorbed by simple sensible heating of the aluminum substrate alone—thereby slowing the rate of temperature increase within the payload chamber. This thermal buffering extends the duration of acceptable temperature maintenance during periods when the thermoelectric cooling element is inactive to conserve battery power.

[0114] Conversely, during active cooling when the thermoelectric element operates to reduce payload chamber temperature, the tetradecane coating undergoes exothermic liquid-to-solid phase transition as temperature decreases through 5.5° C., releasing stored latent heat. This phase change behavior moderates temperature fluctuations in both heating and cooling directions, creating more stable thermal conditions within the payload chamber and reducing the frequency and duration of active cooling cycles required to maintain the target temperature range.

[0115] Alternative phase change materials commonly employed in refrigeration applications exhibit phase transition temperatures that fall outside the 2-8° C. pharmaceutical storage range. Paraffin waxes with higher carbon chain lengths transition at temperatures above 10° C., providing no thermal buffering benefit within the target operating range. Lower molecular weight hydrocarbons transition at temperatures below 0° C., again offering no buffering within the pharmaceutical storage temperature window. Salt hydrate Thermal control material and eutectic mixtures designed for refrigeration applications typically target frozen storage temperatures well below 0° C. The selection of tetradecane specifically addresses the technical challenge of providing phase change thermal buffering precisely within the 2-8° C. range required for temperature-sensitive pharmaceutical products, vaccines, and biological samples.

[0116] Polymerization Process and Surface Bonding Mechanism are now discussed. The term polymerization process as used herein refers to a controlled deposition and surface-bonding process wherein the hydrocarbon coating material is chemically anchored to the aluminum substrate. In embodiments where the aluminum surfaces have been anodized, the hydrocarbon material bonds to the aluminum oxide layer through thermal curing, crosslinking reactions, or plasma-assisted bonding mechanisms. The bonding process may involve heating the coated aluminum body to temperatures between 80° C. and 150° C. for durations ranging from 30 minutes to 4 hours to promote adhesion and create a durable interface between the hydrocarbon coating and the aluminum oxide surface. Alternative bonding methods include UV-initiated crosslinking, catalyst-assisted curing using metal-organic compounds, or plasma surface activation followed by vapor deposition of the hydrocarbon material. The resulting bond exhibits sufficient strength to withstand repeated thermal cycling through the phase transition temperature without delamination or coating degradation over hundreds or thousands of operational cycles.

[0117] Dimensional Specifications of Grid Pattern and Fin Elements are now discussed. The grid pattern 1204 comprises apertures having dimensions between 8 millimeters and 12 millimeters in width and between 8 millimeters and 12 millimeters in height, creating square or rectangular openings through the lateral walls of the grill structure 1200. The pitch between grid members, measured center-to-center, ranges from approximately 8 millimeters to 10 millimeters, corresponding to the wall thickness of approximately 0.71 millimeters plus the aperture dimension. For a grill structure 1200 configured for a one-liter payload capacity, the total aperture count ranges from approximately 40 to 80 apertures, representing a density of approximately 10 to 20 apertures per 100 square centimeters of lateral wall surface area. This aperture density optimizes the balance between surface area maximization for thermal exchange, structural integrity of the grid framework, and weight reduction compared to solid-walled alternatives.

[0118] The fin elements 1202 exhibit dimensional characteristics optimized for thermal performance in portable temperature-controlled applications. Each fin element has a height ranging from 20 millimeters to 50 millimeters measured perpendicular to the base surface, a length ranging from 60 millimeters to 120 millimeters measured along the longitudinal dimension of the grill structure 1200, and a thickness ranging from 1.0 millimeters to 2.0 millimeters. The spacing between adjacent fin elements, defining the channel width, ranges from 6 millimeters to 12 millimeters to permit adequate fluid circulation while maintaining sufficient fin density for effective heat transfer. In stepped configurations, the fin elements 1202 are arranged in 2 to 3 tiers with each tier offset vertically by 3 millimeters to 8 millimeters, creating the multi-level geometry visible in FIG. 12. The fin elements 1202 may be formed through machining or extrusion processes from a single aluminum body to ensure thermal continuity with the base surface, or alternatively may be fabricated as separate components and joined to the base surface through brazing or welding operations.

[0119] Overall Dimensional Specifications and Scaling Embodiments are now discussed. The grill structure 1200 configured for integration with a one-liter payload capacity portable temperature-controlled enclosure exhibits external dimensions with height ranging from 80 millimeters to 140 millimeters, width ranging from 80 millimeters to 140 millimeters, and depth ranging from 30 millimeters to 60 millimeters. The total mass of the assembled grill structure 1200, including both the aluminum body and the applied hydrocarbon coating layer, is approximately 0.67 kilograms. In alternative embodiments configured for larger payload capacities, the grill structure dimensions scale proportionally while maintaining the fundamental structural and thermal characteristics. For a twelve-liter capacity system, the grill structure dimensions range from 200 millimeters to 280 millimeters in width and height, with depth ranging from 40 millimeters to 80 millimeters. For a forty-two-liter capacity system, dimensions range from 300 millimeters to 450 millimeters in width and height, with depth ranging from 50 millimeters to 100 millimeters. These scaled embodiments maintain the grid pattern aperture density, fin spacing ratios, and wall thickness specifications while increasing overall thermal management capacity proportional to payload volume.

[0120] Surface Treatment Process Variations are now discussed. In addition to anodization and sand blasting, the aluminum surfaces of the grill structure 1200 may undergo various surface treatment processes prior to hydrocarbon coating application to enhance coating adhesion and thermal transfer characteristics. Such treatments include micro-etching through chemical roughening agents that create controlled surface texture at the microscopic level, plasma activation that modifies surface chemistry to improve wetting and bonding characteristics, ceramic conversion coating that creates a thin ceramic layer on the aluminum surface, bead blasting using fine grit media to achieve specific surface roughness profiles, or chromate conversion coating using RoHS-compliant formulations for enhanced corrosion resistance. Multiple surface treatments may be applied in sequence, such as anodization followed by plasma activation, to achieve optimal surface properties for hydrocarbon coating adhesion. The selection of surface treatment processes may be tailored to specific manufacturing requirements, environmental conditions, or performance specifications for particular applications.

[0121] Thermal Control Material Properties and Performance Characteristics are now discussed. The tetradecane thermal control material provides latent heat storage capacity ranging from approximately 200 kilojoules per kilogram to 220 kilojoules per kilogram during phase transition. The phase transition occurs at approximately 5.5° C.±0.5° C., positioning the transition within the target operating temperature range of 2° C. to 8° C. The hydrocarbon coating layer exhibits a thickness ranging from 20 micrometers to 200 micrometers depending on the deposition method employed and the number of coating application cycles. Thinner coatings in the range of 20 to 50 micrometers provide rapid thermal response with lower thermal mass, while thicker coatings in the range of 100 to 200 micrometers provide greater latent heat storage capacity for extended passive thermal buffering duration. During solidification from liquid to solid phase, the tetradecane releases stored latent heat uniformly across the coated surfaces, helping to maintain temperature stability within the payload chamber when the thermoelectric cooling element cycles off to conserve battery power. This phase change mechanism has been demonstrated through thermal cycling tests to remain functional through more than 500 complete freeze-thaw cycles without significant degradation in thermal performance or coating integrity.

[0122] Thermal Interface Configuration and Materials are now discussed. The mounting surface 1206 of the grill structure 1200 interfaces with the semiconductor chip 202 through a thermal interface material layer that ensures intimate thermal contact and minimizes thermal resistance in the heat transfer pathway. Suitable thermal interface materials include silicone-based thermal pastes, graphite thermal sheets, phase-change thermal pads, or metal-filled polymer compounds. The thermal interface material layer exhibits a thickness ranging from 50 micrometers to 150 micrometers in the compressed state, achieving thermal conductivity of at least 3 watts per meter-kelvin, with preferred embodiments exhibiting thermal conductivity ranging from 6 to 10 watts per meter-kelvin. The mounting surface 1206 is machined to a flatness tolerance of 50 micrometers or less to ensure uniform contact pressure distribution across the interface. The semiconductor chip 202 is mechanically secured to the mounting surface 1206 through fasteners such as screws or clips with controlled torque application, maintaining consistent mounting pressure between 30 PSI and 40 PSI as discussed previously, thereby ensuring stable thermal resistance and optimal heat transfer performance across the thermal interface.

[0123] Alternative Hydrocarbon Thermal Control Materials are now discussed. While tetradecane represents the preferred thermal control material for applications requiring temperature maintenance in the 2° C. to 8° C. range, alternative hydrocarbon compounds may be employed for different operating temperature ranges or to achieve specific thermal performance characteristics. Suitable alternative hydrocarbons include tridecane having thirteen carbon atoms and exhibiting a phase transition temperature of approximately 4.1° C., pentadecane having fifteen carbon atoms and exhibiting a phase transition temperature of approximately 10° C., or hexadecane having sixteen carbon atoms and exhibiting a phase transition temperature of approximately 18° C. In general, the hydrocarbon coating may comprise C12 to C16 alkanes or mixtures thereof, selected based on the desired phase transition temperature for the specific application. Eutectic mixtures of multiple hydrocarbon compounds may be formulated to achieve phase transition temperatures intermediate between the individual component melting points, or to broaden the phase transition temperature range to provide thermal buffering across a wider operating temperature window. The selection of hydrocarbon thermal control material may be tailored to specific pharmaceutical storage requirements, ambient environmental conditions, or battery capacity constraints of particular portable temperature-controlled enclosure implementations.

[0124] Alternative Aluminum Alloy Embodiments are now discussed. While 6000-series aluminum alloys represent the preferred material for the aluminum body due to their favorable combination of thermal conductivity, formability, and corrosion resistance, alternative aluminum alloy compositions may be employed to optimize specific performance characteristics. The aluminum body may comprise 1000-series aluminum alloys having the highest thermal conductivity among aluminum alloy families, suitable for applications where maximum heat transfer rate is prioritized. Alternatively, 3000-series aluminum alloys incorporating manganese for enhanced corrosion resistance may be employed in harsh environmental conditions or marine applications. The aluminum body may comprise 5000-series aluminum alloys incorporating magnesium for increased mechanical strength while maintaining good thermal conductivity, suitable for applications requiring enhanced structural rigidity or impact resistance. In high-performance applications, 7000-series aluminum alloys incorporating zinc may be employed where maximum mechanical strength is required, accepting somewhat reduced thermal conductivity compared to lower-series alloys. The selection of aluminum alloy composition may be optimized based on the specific requirements of manufacturing processes, operational environments, structural loading conditions, or cost constraints of particular implementations.

[0125] For purposes of this disclosure, the term polymerization as applied to the hydrocarbon coating layer refers to a surface-bonding and stabilization process by which the hydrocarbon material is transformed from a free-flowing molecular state into a mechanically stable, adherent, and thermally durable coating on the aluminum substrate, rather than to classical bulk-chain polymer formation of the hydrocarbon compound itself. In one embodiment, the tetradecane is chemically anchored to an activated aluminum or aluminum oxide surface through crosslinking reactions induced by thermal curing, plasma excitation, ultraviolet activation, catalytic surface bonding, or combinations thereof, thereby forming a polymer-like bonded network at the aluminum interface that resists delamination during repeated phase-change cycling. In alternative embodiments, the coating layer may be applied using plasma-assisted vapor deposition, ion-assisted deposition, or surface-initiated bonding processes that create a crosslinked or semi-crosslinked hydrocarbon film exhibiting mechanical stability, thermal durability, and phase-change thermal control behavior equivalent to a polymerized coating. Accordingly, the term polymerization as used herein encompasses surface-anchored hydrocarbon bonding, crosslinked molecular film formation, and plasma-deposited polymer-like hydrocarbon layers, all of which produce a mechanically stable phase-change coating that remains adhered to the aluminum substrate throughout repeated solid-liquid thermal transition cycles.

[0126] The hybrid fin-and-grid geometry illustrated in FIG. 12 represents a structural configuration not found in conventional heat exchangers or TCM-coated assemblies. Traditional finned heat sinks employ either longitudinal fins on solid backing plates or plate-fin exchangers with continuous walls. The present design integrates a lattice-type grid wall 1204 surrounding a stepped, multi-tiered fin cluster 1202 within a unified aluminum body. This combination creates complex three-dimensional conduction pathways enabling heat to propagate laterally through the grid members while simultaneously propagating vertically along the fin cores. No known prior-art heat exchanger adopts this distributed 3D conduction architecture combined with a conformal phase-change hydrocarbon coating. The structural integration of grid walls with stepped fin tiers produces a thermal distribution pattern fundamentally different from planar or unidirectional fin arrays, thus conferring novelty over existing heat exchanger constructs.

[0127] The grid structure 1204 additionally functions as a mechanical stress-damping framework during repeated solid-liquid phase cycling of the hydrocarbon coating. As the coating expands and contracts volumetrically during phase change, the grid members flex minutely, relieving stresses that would otherwise cause delamination or cracking in conventional coated fin geometries. This mechanical compliance effect, arising from the specific aperture pattern and thin-wall aluminum members, results in significantly prolonged coating adhesion and durability. Thermal cycling tests show that grid-reinforced structures maintain coating integrity more than 2× longer than equivalent coatings applied to monolithic fin plates. This performance improvement is unexpected and non-intuitive, as prior art teaches solid structures for thermal uniformity rather than grid-based flexible frameworks.

[0128] The grid apertures 1204 increase radiative thermal exchange beyond what is achievable with planar fins alone. The multiple edges, corners, and line-of-sight perforations create significantly higher effective emissivity due to distributed geometry factors. Radiative surfaces facing inward toward the payload chamber enhance thermal coupling during passive warming periods, while outward-facing surfaces facilitate heat evacuation during cooldown phases. This multi-directional radiation field is absent in prior art devices that rely solely on conduction and convection through planar fins or enclosed TCM packs.

[0129] The stepped fin arrangement 1202 establishes multiple thermal zones positioned at varying physical distances from the thermoelectric interface 1206. This geometry creates controlled gradients allowing heat to be rapidly shuttled from the thermoelectric junction outward while enabling the hydrocarbon coating to buffer these gradients across staggered zones. The tiered configuration thus distributes both active and passive thermal loads with increased uniformity and shorter characteristic response times. Fin geometries in the prior art do not include multi-level stepped arrangements intentionally designed to tune thermal impedance paths for TCM-integrated systems.

[0130] The configuration of the internal cavity behind the grid apertures in FIG. 12 facilitates uniform coating deposition on surfaces that would otherwise be inaccessible. The open grid design ensures that vapor-deposited or liquid-applied hydrocarbons reach all surfaces—including deep internal corners and fin-to-wall intersections—thereby achieving complete 360-degree TCM coverage. This addresses a well-known limitation in prior art coated heat exchangers where coatings typically fail to penetrate internal geometries, resulting in patchy TCM application, thermal hotspots, and adhesion failures.

[0131] The grid openings 1204 also serve to channel natural convection currents along both the vertical and transverse directions. This multiplanar convection behavior cannot be achieved in conventional fin-only arrays, where flow is largely linear and laminar. The intersecting apertures drive mixing zones, increasing convective heat transfer coefficients by up to 15-25% relative to planar fins. This improvement is synergistic with the hydrocarbon coating, which benefits from accelerated thermal equalization during both heating and cooling cycles.

[0132] The posterior mounting face 1206 provides a tri-functional surface:

[0133] (1) Primary thermal interface to the thermoelectric chip;

[0134] (2) Structural backbone anchoring the entire fin-grid assembly; and

[0135] (3) Coating stabilization plane preventing shear displacement of the hydrocarbon layer during phase cycling. This multifunctionality distinguishes the structure from conventional heat exchangers where the TE interface is typically isolated from the structural frame and from heat storage layers.

[0136] The interaction between the vertical fin array and lateral grid walls creates anisotropic thermal conductivity: heat flows rapidly along the vertical direction due to fin continuity, while lateral heat propagation is moderated through the grid members. This anisotropy produces controlled thermal equalization around the payload chamber rather than uncontrolled dissipation. Conventional heat sinks aim for isotropic dissipation and thus do not teach or suggest such directional thermal tuning.

[0137] The grid structures act as thermal braces tying distal fin tips to the mounting surface 1206 through multiple micro-conduction pathways. This creates a robust conduction network analogous to truss reinforcement. Unlike prior art fin arrays which rely solely on conduction through fin bases, the present design distributes conduction across both fin bases and grid contact points, significantly improving thermal uniformity and mechanical vibration resistance.

[0138] In certain embodiments, the entire grill—including fins, grid walls, and mounting surface—is fabricated as a single monolithic aluminum component through extrusion, investment casting, or additive manufacturing. This monolithic architecture eliminates solder joints, brazing seams, or mechanical fasteners that create thermal bottlenecks in conventional exchangers. The monolithic design also allows the hydrocarbon coating to be applied as a continuous film without seam discontinuities, enabling greater longevity and improved heat spreading performance.

[0139] The design of the grill structure 1200 synergizes with the angled thermoelectric chip orientation shown in prior figures (e.g., 20° tilt). The stepped fins align with the direction of TE cold-side conduction, and the grid channels align with rising convection flow lines. This alignment is deliberate and enhances both active cooling efficiency and passive buffer distribution. Prior art does not teach such co-optimization of fin geometry relative to TE chip angle.

[0140] The combination of the grid and stepped fins directs the melt front of the phase-change hydrocarbon coating in a predictable manner. As the material transitions from solid to liquid, the melt progresses first through fin bases, then laterally across grid members, ensuring uniform latent heat absorption. This ordered melt behavior is not present in conventional TCM chambers, where melt fronts are irregular and create unpredictable thermal buffering behavior. Controlled melt progression is a strong indicator of an engineered thermal solution rather than an obvious modification of prior art.CONCLUSION

[0141] Although the present embodiments have been described with reference to specific example embodiments, various modifications and changes can be made to these embodiments without departing from the broader spirit and scope of the various embodiments. For example, the various devices, modules, etc. described herein can be enabled and operated using hardware circuitry, firmware, software or any combination of hardware, firmware, and software (e.g., embodied in a machine-readable medium).

[0142] In addition, it can be appreciated that the various operations, processes, and methods disclosed herein can be embodied in a machine-readable medium and / or a machine accessible medium compatible with a data processing system (e.g., a computer system), and can be performed in any order (e.g., including using means for achieving the various operations). Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. In some embodiments, the machine-readable medium can be a non-transitory form of machine-readable medium.

Examples

Embodiment Construction

[0073]The hydrocarbon-coated aluminum grill comprises a finned heat transfer component configured for enhanced thermal management in portable temperature-controlled systems. The grill structure facilitates bidirectional thermal energy transmission through both active cooling distribution and passive heat absorption mechanisms.

[0074]Structure and Dimensional Specifications are now discussed by way of example. The grill structure comprises an aluminum body having a wall thickness of approximately 0.71 millimeters. In one embodiment, the aluminum body comprises a 6000-series aluminum alloy, selected for its favorable combination of thermal conductivity, formability, and corrosion resistance. The overall mass of the assembled grill structure is approximately 0.67 kilograms.

[0075]The grill structure includes a plurality of fins extending from a base surface. In the illustrated embodiment, the plurality of fins comprises approximately ten discrete fin elements, each fin element having sub...

CLAIM OF PRIORITY

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 770,592, filed on Mar. 12, 2025. This provisional patent application is hereby incorporated by reference in its entirety.BACKGROUNDField of the Invention

[0002] The present invention relates generally to thermal management components for portable temperature-controlled storage systems, and more particularly to hydrocarbon-coated aluminum grill structures that provide enhanced heat transfer and thermal buffering capabilities in thermoelectric cooling applications.Background

[0003] Temperature-sensitive materials, particularly in medical and biological applications, require precise temperature control during storage and transport. Portable cooling systems for such applications must maintain consistent temperatures while operating on limited battery power, presenting significant engineering challenges in thermal management efficiency and energy consumption.

[0004] Traditional portable cooling solutions rely on several approaches, each with distinct limitations. Compressor-based refrigeration systems consume substantial electrical power and are impractical for extended battery-powered operation. Passive cooling solutions using ice packs or gel packs cannot maintain precise temperature control over extended periods and require frequent replacement. Phase change material (TCM) systems provide thermal buffering but typically lack active temperature control mechanisms.

[0005] While thermoelectric devices offer solid-state cooling without moving parts or refrigerants, their integration into portable systems presents thermal management challenges. Efficient heat dissipation from the hot side of the thermoelectric element is critical to system performance, while the cold side must effectively transfer cooling energy to the payload chamber.

[0006] Conventional heat exchangers in thermoelectric cooling systems typically comprise aluminum or copper finned structures that rely solely on thermal conduction and convection for heat transfer. These passive heat transfer surfaces lack thermal buffering capacity, resulting in rapid temperature fluctuations when active cooling cycles on and off to conserve battery power. When the thermoelectric element is inactive, temperatures can drift rapidly due to the limited thermal mass of metal fins.

[0007] Additionally, uncoated metal fins in compact portable systems often exhibit thermal gradients and localized hot or cold spots that reduce overall cooling efficiency. The thermal performance of finned heat exchangers is fundamentally limited by the available surface area and the thermal conductivity of the base material. Increasing fin density to expand surface area creates manufacturing challenges and can impede air circulation, while thinner fins may lack structural integrity.

[0008] Phase change materials have been proposed for thermal buffering in refrigeration applications due to their ability to absorb and release substantial latent heat energy during phase transitions. However, integration of TCMs with finned heat exchangers in compact portable devices presents significant technical challenges. Conventional approaches using TCM encapsulation in separate chambers add weight, volume, and complexity while reducing available heat transfer surface area. Mechanical containment of TCMs typically requires additional housing structures that increase thermal resistance between the TCM and the heat exchange surfaces.

[0009] Coating technologies have been applied to heat transfer surfaces for various purposes, including corrosion protection and surface modification. However, conventional coatings are typically applied to alter surface properties such as emissivity or chemical resistance, rather than to provide integrated thermal energy storage. The application of phase change materials as surface coatings on complex geometries such as finned heat exchangers has proven technically challenging, as uniform coating thickness and adequate adhesion are difficult to achieve on vertical fin surfaces and internal channels.

[0010] Furthermore, existing systems often suffer from inefficient thermal coupling between thermoelectric cooling elements and payload chambers. Space constraints in portable systems limit the size and configuration of heat transfer components, making it difficult to achieve both efficient heat dissipation and adequate thermal buffering within compact form factors. The conflicting requirements of maximizing heat transfer surface area, providing thermal energy storage capacity, maintaining structural integrity, and minimizing weight and volume present significant design challenges.

[0011] There exists a need in the art for thermal management components that combine efficient heat transfer with integrated thermal buffering in a compact, lightweight structure suitable for portable thermoelectric cooling applications. Such components should provide enhanced thermal performance compared to conventional uncoated finned heat exchangers while maintaining or reducing system complexity, weight, and manufacturing costs. The present invention addresses these needs by providing a hydrocarbon-coated aluminum grill structure that integrates phase change thermal buffering directly into the heat transfer surface through a polymerized coating process.SUMMARY OF THE INVENTION

[0012] In one aspect, a thermal management component for a portable temperature-controlled enclosure comprises an aluminum body and a hydrocarbon coating layer. The aluminum body comprises a base surface configured for thermal coupling with a thermoelectric cooling element and a plurality of fin elements extending from the base surface and defining a plurality of channels therebetween, wherein the plurality of fin elements are configured to provide an expanded surface area for thermal energy exchange. The hydrocarbon coating layer is disposed on surfaces of the aluminum body including surfaces of the plurality of fin elements and surfaces of the plurality of channels. The hydrocarbon coating layer comprises a thermal control material, wherein the thermal control material comprises tetradecane having a phase transition temperature between 4° C. and 7° C. The hydrocarbon coating layer is configured to undergo solid-to-liquid phase transition absorbing latent heat energy when temperature increases through the phase transition temperature and is configured to undergo liquid-to-solid phase transition releasing latent heat energy when temperature decreases through the phase transition temperature. The aluminum body is configured to conduct thermal energy from the thermoelectric cooling element through the base surface and distribute the thermal energy across the plurality of fin elements during active cooling operation. The hydrocarbon coating layer is configured to provide thermal buffering through phase change energy absorption during passive operation when the thermoelectric cooling element is inactive, thereby extending duration of temperature stability within a target temperature range of 2° C. to 8° C.BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a top view of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0014] FIGS. 2 and 3 are isometric views of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0015] FIG. 4 is a front view of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0016] FIG. 5 is a side view of example embodiment of a portable temperature-controlled enclosure, according to some embodiments.

[0017] FIG. 6-9 illustrate various example views of an aluminum cooling chamber portable unit, according to some embodiments.

[0018] FIG. 6 illustrates a top-view of aluminum cooling chamber portable unit, according to some embodiments.

[0019] FIG. 7 illustrates a isometric-view of aluminum cooling chamber portable unit, according to some embodiments.

[0020] FIG. 8 illustrates a rear-view of aluminum cooling chamber portable unit, according to some embodiments.

[0021] FIG. 9 illustrates a side-view of aluminum cooling chamber portable unit, according to some embodiments.

[0022] FIG. 10 is a block diagram of a sample computing environment that can be utilized to implement various embodiments.

[0023] FIG. 11 illustrates a logical view of a portable temperature-controlled enclosure, according to some embodiments.

[0024] FIG. 12 illustrates an isometric view of a hydrocarbon-coated aluminum grill structure according to one embodiment of the present invention.

[0025] The Figures described above are a representative set and are not an exhaustive with respect to embodying the invention.DESCRIPTION

[0026] Disclosed are a system, method, and article of manufacture for an hydrocarbon-enhanced aluminum thermal lattice for controlled heat flux modulation. The following description is presented to enable a person of ordinary skill in the art to make and use the various embodiments. Descriptions of specific devices, techniques, and applications are provided only as examples. Various modifications to the examples described herein can be readily apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other examples and applications without departing from the spirit and scope of the various embodiments.

[0027] Reference throughout this specification to ‘one embodiment,’‘an embodiment,’‘one example,’ or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, according to some embodiments. Thus, appearances of the phrases ‘in one embodiment,’‘in an embodiment,’ and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.

[0028] Furthermore, the described features, structures, or characteristics of the invention may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art can recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

[0029] The schematic flow chart diagrams included herein are generally set forth as logical flow chart diagrams. As such, the depicted order and labeled steps are indicative of one embodiment of the presented method. Other steps and methods may be conceived that are equivalent in function, logic, or effect to one or more steps, or portions thereof, of the illustrated method. Additionally, the format and symbols employed are provided to explain the logical steps of the method and are understood not to limit the scope of the method. Although various arrow types and line types may be employed in the flow chart diagrams, and they are understood not to limit the scope of the corresponding method. Indeed, some arrows or other connectors may be used to indicate only the logical flow of the method. For instance, an arrow may indicate a waiting or monitoring period of unspecified duration between enumerated steps of the depicted method. Additionally, the order in which a particular method occurs may or may not strictly adhere to the order of the corresponding steps shown.Definitions

[0030] Example definitions for some embodiments are now provided.

[0031] Acrylonitrile butadiene styrene (ABS) is a common plastic polymer.

[0032] High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a polyethylene thermoplastic made from petroleum.

[0033] Phase change material (TCM) is a substance with a high heat of fusion which, melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. Heat is absorbed or released when the material changes from solid to liquid and vice versa. Example TCM materials can include, inter alia: organic (paraffin and nonparaffin), inorganic (salt hydrates and metallic alloys), and eutectic (mixture of two or more TCM components: organic, inorganic, and both).

[0034] Polypropylene (PP) is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene.

[0035] Press fit or friction fit is a fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening.

[0036] Temperature sensors can include mechanical temperature sensors, electrical temperature sensors, integrated circuit sensors, medometers, etc.

[0037] Thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple. A thermoelectric device creates voltage when there is a different temperature on each side. Conversely, when a voltage is applied to it, heat is transferred from one side to the other, creating a temperature difference. At the atomic scale, an applied temperature gradient causes charge carriers in the material to diffuse from the hot side to the cold side.

[0038] Thermal control material (TCM) is a substance capable of storing and releasing thermal energy to regulate temperature. It is noted that TCM can include phase change materials (TCM) such as paraffins, salt hydrates, and eutectic mixtures, thermal mass materials such as water or glycol solutions, and other heat storage media. TCM can include: Phase change materials (TCM) that store energy through phase transitions (e.g., paraffins, salt hydrates, eutectic mixtures); Sensible heat storage materials that store energy through temperature change (e.g., water, glycol solutions, mineral oils, molten salts); Solid thermal mass materials providing thermal inertia (e.g., concrete, ceramic, stone, sand); Metallic thermal buffers with high conductivity (e.g., aluminum heat sinks, copper spreaders, graphite plates, metal foam); and Composite thermal materials combining multiple thermal management functions (e.g., metal matrix composites, polymer-TCM encapsulations, graphene-enhanced compounds).Example Smart Refrigerator Exterior Views

[0039] FIGS. 1-5 provide series of views of an example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. The series of views includes a set of orthographic views (e.g. top, front, side, and isometric) of the portable temperature-controlled enclosure according to one embodiment. The example embodiment of a portable temperature-controlled enclosure 100 can be a top loaded system. Portable temperature-controlled enclosure 100 can include an optimized solid-state cooling system (e.g. see infra). Portable temperature-controlled enclosure 100 provides a portable temperature-controlled enclosure utilizing an innovative solid-state cooling system with optimized thermal management. Portable temperature-controlled enclosure 100 combines advanced thermoelectric cooling technology with control systems to achieve superior temperature stability and extended battery operation.

[0040] Portable temperature-controlled enclosure 100 comprises several key components working in concert: a precision-engineered payload chamber for storing temperature-sensitive materials, an optimized thermoelectric cooling system with angular mounting configuration, an integrated TCM chamber for thermal buffering, and a heat dissipation system including honeycomb ventilation. These components are managed by advanced monitoring and control systems, all supported by extended battery-powered operation capability.

[0041] The top-loading portable temperature-controlled enclosure 100 represents a breakthrough in portable refrigeration technology, utilizing solid-state cooling principles to maintain precise temperature control. The top-loading portable temperature-controlled enclosure 100 distinguishes itself through the complete elimination of traditional cooling infrastructure components such as compressors, refrigerant gases, cooling coils, ice packs, or gel packs.

[0042] Example physical specifications of the top-loading portable temperature-controlled enclosure 100 are now discussed. The top-loading portable temperature-controlled enclosure 100 payload capacity, by way of example, can be a one (1) liter. The top-loading portable temperature-controlled enclosure 100 can include a top-loading design with example dimensions of 107.78 mm×119.92 mm×166.84 mm.

[0043] Access to the top-loading portable temperature-controlled enclosure 100 can be via a top-mounted lid providing full access to internal chamber. Construction of The top-loading portable temperature-controlled enclosure 100 can include precision-engineered aluminum chamber with integrated cooling system.

[0044] An example Core Cooling Technology of the top-loading portable temperature-controlled enclosure 100 is now discussed. The top-loading portable temperature-controlled enclosure 100 employs an advanced solid-state cooling mechanism based on semiconductor physics. As a cooling principle, the top-loading portable temperature-controlled enclosure 100 utilizes an electron mobility differential between semiconductor materials. By way of operation, the top-loading portable temperature-controlled enclosure 100 uses an electric current passage through dual-semiconductor junction.

[0045] The thermal energy absorption during electron transition between materials is implemented to optimizes cooling efficiency. The top-loading portable temperature-controlled enclosure 100 can achieve target temperature (2° C.) within 2-hour initialization period. The top-loading portable temperature-controlled enclosure 100 implements temperature maintenance to maintain 2-8° C. range for 72 hours without external power.

[0046] An example Thermal Management System of the internal payload chamber incorporates a thermal management design. As seen below, the top-loading portable temperature-controlled enclosure 100 includes a chamber construction that includes payload 104. Here, the material composition can include a specialized heat-absorbing material combined with aluminum. The top-loading portable temperature-controlled enclosure 100 utilizes thermal spreading via an engineered aluminum structure for optimal temperature distribution. The top-loading portable temperature-controlled enclosure 100 performs heat absorption via a material matrix for thermal energy management.

[0047] The top-loading portable temperature-controlled enclosure 100 provides dynamic temperature control. Primary cooling is performed via a solid-state semiconductor chip (e.g. discussed infra). Supplementary cooling can be performed via a thermal mass buffer system. Hybrid operation between thermal mass and active cooling Response system can be used for temperature maintenance. Automated cooling bursts for temperature deviation compensation can be performed.

[0048] The top-loading portable temperature-controlled enclosure 100 can include a power and environmental adaptation power system 1102. The top-loading portable temperature-controlled enclosure 100 includes an input compatibility, by way of example of a Universal AC power (110V / 220V) and an integrated charging system. Battery operation can be for 72-hour autonomous operation capability.

[0049] Optimized power consumption during steady-state operation can be obtained using bi-directional temperature control capability. For example, in a winter mode operation, the top-loading portable temperature-controlled enclosure 100 functions in extreme cold environments (−20° C. to −30° C.). Thermal management systems 1104 of the top-loading portable temperature-controlled enclosure 100 can maintains 2-8° C. in both hot and cold ambient conditions. An example environmental range enables The top-loading portable temperature-controlled enclosure 100 to be functional across extreme temperature variations.

[0050] The top-loading portable temperature-controlled enclosure 100 includes a monitoring and communication system 1106 for temperature monitoring. Real-time temperature tracking is implemented across continuous internal temperature measurement. The top-loading portable temperature-controlled enclosure 100 includes a digital display for current temperature indication. The top-loading portable temperature-controlled enclosure 100 includes an alert system for temperature deviations. The top-loading portable temperature-controlled enclosure 100 includes a communication infrastructure 1108 that can include an integrated LTE module with SIM card and / or GPS location tracking capability. The top-loading portable temperature-controlled enclosure 100 can perform data transmission intervals (e.g. at 4-5 minutes. The top-loading portable temperature-controlled enclosure 100 also includes cloud connectivity for remote monitoring. A backup SD card storage system can be included for offline data logging. The top-loading portable temperature-controlled enclosure 100 includes a Data Management module 1110 for continuous temperature logging and location tracking and recording. The top-loading portable temperature-controlled enclosure 100 can also perform automated cloud data synchronization.

[0051] The top-loading portable temperature-controlled enclosure 100 includes an Operation and Performance Temperature Performance module that manages an initial cooldown (e.g. 2 hours to reach target temperature with a temperature range: 2-8° C. maintenance and operation duration of 72 hours on battery power).

[0052] A thermal interface material utilizes a high thermal conductivity compound with controlled thickness application and full surface coverage verification. Mounting pressure can be maintained at 30-40 PSI through a spring-loaded mechanism, ensuring even pressure distribution across the chip surface and compensation for thermal expansion and contraction in some example embodiments.

[0053] The top-loading configuration represents a significant advancement in portable temperature-controlled storage, combining innovative solid-state cooling technology with thermal management and monitoring systems. The design achieves exceptional efficiency and reliability while maintaining precise temperature control across varied environmental conditions.

[0054] More specifically, FIG. 1 is a top view of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. FIGS. 2 and 3 are isometric views of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. FIG. 4 is a front view of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments. FIG. 5 is a side view of example embodiment of a portable temperature-controlled enclosure 100, according to some embodiments.

[0055] In one embodiments, portable temperature-controlled enclosure 100 can have a top-loading configuration with example payload dimensions: 3.2″×4.1″×5.5″. An example top opening capacity can be one (1) liter. Overall dimensions, by way of example, can be 107.78 mm×119.92 mm×166.84 mm. Portable temperature-controlled enclosure 100 provides a top access lid for payload (e.g. medications, etc.) insertion.

[0056] FIG. 6-9 illustrate various example views of an aluminum cooling chamber portable unit 200, according to some embodiments. Aluminum cooling chamber portable unit 200 can be the internal cooling / heating system of portable temperature-controlled enclosure 100.

[0057] Aluminum cooling chamber portable unit 200 of portable temperature-controlled enclosure 100 comprises a thermoelectric cooling mechanism wherein electrical power is transmitted through a strategically positioned semiconductor chip 202 mounted at a calculated angular orientation relative to the aluminum payload chamber 204. The semiconductor chip 202 incorporates a material combination wherein electrons traverse between different semiconductor elements, creating an energy absorption effect at the material junction interfaces. This energy absorption phenomenon, occurring at the precise locations where the material composition transitions, facilitates the cooling process through electron mobility differentials between the semiconductor materials.

[0058] The thermal management system utilizes direct thermal coupling between the semiconductor chip 202 and an aluminum payload chamber 204, whereby the energy absorption at the material junctions actively extracts heat from the payload area through the aluminum wall interface. The extracted thermal energy is subsequently transferred to a closed-loop cooling system 206 comprising fluid-carrying pipes 208 directly coupled to the posterior surface of the semiconductor chip (e.g. can include a heat sink system). The cooling loop 206 employs either water or antifreeze as the working fluid, circulating through an engineered pipe network via an integrated pump mechanism.

[0059] The system's thermal circuit can be completed through a fan-assisted heat exchanger configuration 214, wherein the heated working fluid from the cooling loop 206 is actively cooled before being recirculated through the system. The angular mounting of the semiconductor chip, deliberately oriented at a calculated angle rather than perpendicular to the payload chamber, achieves enhanced cooling distribution by optimizing the radius of coolness spread and increasing the effective surface area coverage. This angular configuration demonstrably improves the speed and uniformity of temperature distribution compared to traditional perpendicular mounting arrangements.

[0060] The thermal control system can operate in a dual-power configuration, initially utilizing wall power for the cooldown phase until the target temperature (typically 2° C.) is achieved, at which point the system transitions to battery power through a lithium polymer battery assembly capable of maintaining temperature control for 72 hours of autonomous operation. The internal configuration includes various top-loading variants (e.g. via top opening 212, etc.) while maintaining identical operational principles, with the semiconductor chip positioning optimized for each configuration to maximize cooling efficiency through enhanced radial distribution patterns.

[0061] The angular orientation of the semiconductor chip 202 relative to the payload chamber wall facilitates superior thermal spreading characteristics. The cooling effect disperses in a radial pattern rather than traditional linear distribution, resulting in more efficient coverage of the payload surface area and accelerated temperature equalization throughout the chamber. This geometric optimization of the semiconductor chip 202 placement enables the system to achieve more comprehensive thermal coverage compared to conventional perpendicular mounting configurations, as the angular positioning creates an expanded radius of cooling influence that enhances the overall heat absorption efficiency of the system.

[0062] More specifically, FIG. 6 illustrates a top-view of aluminum cooling chamber portable unit 200, according to some embodiments. FIG. 7 illustrates a isometric-view of aluminum cooling chamber portable unit 200, according to some embodiments. FIG. 8 illustrates a rear-view of aluminum cooling chamber portable unit 200, according to some embodiments. FIG. 9 illustrates a side-view of aluminum cooling chamber portable unit 200, according to some embodiments.Example Computer Architecture and Systems

[0063] FIG. 10 depicts an exemplary computing system 1000 that can be configured to perform any one of the processes provided herein. In this context, computing system 1000 may include, for example, a processor, memory, storage, and I / O devices (e.g., monitor, keyboard, disk drive, Internet connection, etc.). However, computing system 1000 may include circuitry or other specialized hardware for carrying out some or all aspects of the processes. In some operational settings, computing system 1000 may be configured as a system that includes one or more units, each of which is configured to carry out some aspects of the processes either in software, hardware, or some combination thereof.

[0064] FIG. 10 depicts computing system 1000 with a number of components that may be used to perform any of the processes described herein. The main system 1002 includes a motherboard 1004 having an I / O section 1006, one or more central processing units (CPU) 1008, and a memory section 1010, which may have a flash memory card 1012 related to it. The I / O section 1006 can be connected to a display 1014, a keyboard and / or other user input (not shown), a disk storage unit 1016, and a media drive unit 1018. The media drive unit 1018 can read / write a computer-readable medium 1020, which can contain programs 1022 and / or data. Computing system 1000 can include a web browser. Moreover, it is noted that computing system 1000 can be configured to include additional systems in order to fulfill various functionalities. Computing system 1000 can communicate with other computing devices based on various computer communication protocols such a Wi-Fi, Bluetooth® (and / or other standards for exchanging data over short distances includes those using short-wavelength radio transmissions), USB, Ethernet, cellular, an ultrasonic local area communication protocol, etc.

[0065] Thermo-electric cooler pump can be managed by a computing system in the portable smart refrigerator. The computing system can be coupled with an exterior display. Exterior display can display various parameters (e.g. temperature, batter power, etc.) of the portable smart refrigerator. Computing system can also be coupled with various other systems such as, inter alia: temperature sensors, digital clocks, Wi-Fi systems, etc.

[0066] FIG. 11 illustrates a logical view 1100 of a portable temperature-controlled enclosure, according to some embodiments. Power and environmental adaptation power system 1102. The top-loading portable temperature-controlled enclosure 100 includes an input compatibility, by way of example of a Universal AC power (110V / 220V) and an integrated charging system. Thermal management systems 1104 manage the temperature of top-loading portable temperature-controlled enclosure 100. Thermal management systems 110 of the top-loading portable temperature-controlled enclosure 100 can maintain 2-8° C. in both hot and cold ambient conditions. Monitoring and communication system 1106 for temperature monitoring. Real-time temperature tracking is implemented across continuous internal temperature measurement. The top-loading portable temperature-controlled enclosure 100 includes a digital display for current temperature indication. The top-loading portable temperature-controlled enclosure 100 includes an alert system for temperature deviations. The top-loading portable temperature-controlled enclosure 100 includes a communication infrastructure 1108 that can include an integrated LTE module with SIM card and / or GPS location tracking capability. The top-loading portable temperature-controlled enclosure 100 can perform data transmission intervals (e.g. at 4-5 minutes. The top-loading portable temperature-controlled enclosure 100 also includes cloud connectivity for remote monitoring. A backup SD card storage system can be included for offline data logging. The top-loading portable temperature-controlled enclosure 100 includes a Data Management module 1110 for continuous temperature logging and location tracking and recording.

[0067] Additional information on chip positioning is now discussed. The innovative cooling system centers around a precisely engineered 40 mm×40 mm semiconductor chip that represents a significant advancement in portable refrigeration technology. This chip, comprising multiple semiconductor junctions arranged in an optimized pattern, is mounted at a carefully calculated 20-degree angle relative to the payload chamber wall, deviating from traditional perpendicular mounting approaches. This specific angular orientation was chosen to maximize the cooling efficiency through enhanced radial distribution patterns.

[0068] The mounting configuration creates a thermal management system where the chip interfaces directly with the aluminum chamber wall for maximum thermal conductivity. This direct coupling is maintained by a spring-loaded mechanism that ensures a consistent 30-40 PSI mounting pressure, crucial for optimal heat transfer. The interface between the chip and wall utilizes a high thermal conductivity compound with carefully controlled thickness and verified full surface coverage.

[0069] The 20-degree mounting angle serves a critical purpose in the system's operation. Unlike conventional perpendicular mounting, which typically results in linear cooling distribution, this angular orientation creates an expanded radius of cooling influence. This radial distribution pattern enables more comprehensive coverage of the payload surface area and facilitates faster temperature equalization throughout the chamber. The result is a more efficient and effective cooling system that achieves superior thermal coverage compared to traditional mounting configurations.

[0070] In the top-loaded configuration, the chip is positioned lower, near the midsection of the wall, with the temperature sensor strategically placed inside the payload wall towards the bottom side. This positioning was specifically chosen to optimize the cooling effect in relation to the temperature sensor location. The entire setup demonstrates a carefully engineered approach to thermal management, where each component's position has been optimized for maximum efficiency.

[0071] The semiconductor chip's design and mounting create a cooling effect that disperses in a radial pattern rather than a traditional linear distribution. This radial dispersion is particularly effective because it provides more uniform coverage across the payload area. The angular mounting effectively increases the total area over which the cooling effect spreads, resulting in more efficient temperature control throughout the chamber. This innovative approach to chip mounting and cooling distribution represents a significant advancement in portable refrigeration technology, offering improved performance over conventional perpendicular mounting systems.

[0072] The system's overall design reflects a deep understanding of thermal dynamics and practical engineering considerations. By combining the precise 40 mm×40 mm chip dimensions with the 20-degree mounting angle and strategic positioning relative to temperature sensors, the system achieves optimal cooling performance while maintaining efficient use of space within the portable unit. The careful attention to mounting pressure, thermal compound application, and interface design ensures reliable and consistent performance, making this cooling system particularly well-suited for portable applications requiring precise temperature control.Detailed Description of an Example Hydrocarbon-Coated Aluminum Grill

[0073] The hydrocarbon-coated aluminum grill comprises a finned heat transfer component configured for enhanced thermal management in portable temperature-controlled systems. The grill structure facilitates bidirectional thermal energy transmission through both active cooling distribution and passive heat absorption mechanisms.

[0074] Structure and Dimensional Specifications are now discussed by way of example. The grill structure comprises an aluminum body having a wall thickness of approximately 0.71 millimeters. In one embodiment, the aluminum body comprises a 6000-series aluminum alloy, selected for its favorable combination of thermal conductivity, formability, and corrosion resistance. The overall mass of the assembled grill structure is approximately 0.67 kilograms.

[0075] The grill structure includes a plurality of fins extending from a base surface. In the illustrated embodiment, the plurality of fins comprises approximately ten discrete fin elements, each fin element having substantially uniform dimensional characteristics. The fins are arranged in a substantially parallel configuration to define a grid-like thermal exchange structure that maximizes available surface area for heat transfer while maintaining mechanical rigidity sufficient to withstand operational stresses.

[0076] Each fin element extends perpendicularly or near-perpendicularly from the base surface, creating a plurality of channels therebetween. These channels permit fluid circulation, whether air or liquid coolant, to facilitate convective heat transfer across the expanded surface area provided by the fin geometry.

[0077] Hydrocarbon Coating Composition and Application are now discussed by way of example. The aluminum surfaces of the grill structure, including the base surface, fin elements, and channel surfaces, are treated with a hydrocarbon coating layer. In one embodiment, the hydrocarbon coating comprises tetradecane (C14H30), a saturated hydrocarbon selected for its phase change thermal properties and coating compatibility with aluminum substrates.

[0078] The hydrocarbon coating is applied through a polymerization process that chemically bonds the hydrocarbon material to the aluminum substrate surfaces. In one embodiment, the polymerization process comprises surface preparation of the aluminum substrate through cleaning and optional anodization to create a receptive surface chemistry, application of the hydrocarbon material in liquid phase, and controlled heating to induce polymerization reactions that crosslink the hydrocarbon molecules and bond them to the aluminum oxide layer.

[0079] The resulting hydrocarbon coating exhibits a substantially uniform thickness across all treated surfaces, including the complex geometries of the fin elements. The coating uniformity ensures consistent thermal performance characteristics throughout the grill structure. The hydrocarbon coating serves multiple thermal management functions: providing a thermal storage medium through phase change material properties, enhancing thermal conductivity across the aluminum-to-environment interface, and facilitating more uniform temperature distribution across the grill structure.

[0080] In alternative embodiments, the aluminum substrate may undergo additional surface treatments prior to hydrocarbon coating application. Such treatments may include anodization to increase surface area at the microscopic level, sand blasting to create surface roughness that enhances both coating adhesion and thermal transfer characteristics, or both. The combination of anodized and sand-blasted aluminum surfaces with the polymerized hydrocarbon coating has been observed to provide superior thermal conduction properties compared to untreated aluminum or coating-only approaches.

[0081] Thermal Interface Configuration is now discussed. The grill structure is configured to interface with a thermoelectric cooling element through a mounting surface located on a posterior portion of the grill structure. In one embodiment, the cooling element mounts substantially vertically along a back face of the grill structure, creating direct thermal communication between the thermoelectric device and the hydrocarbon-coated aluminum body.

[0082] This mounting configuration establishes a bidirectional thermal pathway whereby cooling energy generated by the thermoelectric element is transmitted through the aluminum body and distributed across the expanded surface area provided by the fins and hydrocarbon coating. Simultaneously, thermal energy from the surrounding environment or payload chamber is absorbed by the hydrocarbon coating, conducted through the aluminum substrate, and transferred to the thermoelectric element for removal from the system.

[0083] The vertical mounting orientation of the cooling element relative to the grill structure optimizes thermal performance by minimizing thermal resistance path length between the thermoelectric junction and the primary heat exchange surfaces, facilitating natural convection currents along the fin channels, and enabling efficient integration within compact portable enclosure geometries.

[0084] Thermal Performance Characteristics are now discussed. The hydrocarbon-coated aluminum grill exhibits enhanced thermal management performance compared to conventional uncoated finned heat exchangers. The grid-like fin pattern maximizes surface area available for thermal exchange while the hydrocarbon coating provides additional thermal mass and phase-change thermal buffering. This combination enables the grill structure to both rapidly distribute cooling effects during active refrigeration and absorb thermal loads to maintain temperature stability during passive operation.

[0085] The structural configuration of the grill, with its precisely dimensioned fins and optimized grid spacing, maintains mechanical integrity under operational conditions while providing sufficient open area for fluid circulation. The 0.71 millimeter wall thickness represents a balance between maximizing thermal conductivity, which favors thinner walls, and ensuring adequate structural strength for handling and operational durability, which favors thicker walls.

[0086] The grill structure may be implemented as an integrated component within various portable temperature-controlled enclosure configurations, including but not limited to top-loading refrigeration units, side-loading cooling chambers, cylindrical thermal storage vessels, and modular multi-chamber systems. The modular nature of the grill design enables scalability across different payload volumes and cooling capacity requirements.

[0087] Integration within Broader Thermal Management System is now discussed. While the hydrocarbon-coated aluminum grill represents a discrete component with independent inventive merit, it functions as an integral element within a comprehensive portable refrigeration system. The grill interfaces with other system components including the thermoelectric cooling element, payload chamber, insulative enclosure materials, and control electronics. The synergistic combination of these elements, with the grill serving as a critical thermal interface and distribution component, enables the overall system to achieve precise temperature control with extended battery-powered operation.

[0088] In operation, the grill structure receives cooling energy from the thermoelectric element through direct thermal conduction. The aluminum body rapidly distributes this cooling energy across its surface area, while the hydrocarbon coating absorbs and stores thermal energy through phase change mechanisms. The fin geometry expands the effective surface area exposed to the payload chamber or ambient environment, enabling efficient thermal exchange. The bidirectional thermal management capability, which simultaneously cools through active thermoelectric operation and absorbs heat through passive phase change materials, enables the system to maintain stable temperatures with reduced active cooling duty cycles, thereby extending battery life and improving overall energy efficiency.

[0089] The thermal management system further incorporates a hydrocarbon-coated aluminum grill structure that interfaces with the thermoelectric cooling element to enhance heat transfer efficiency and provide integrated thermal buffering. This grill structure, positioned between the semiconductor chip 202 and the payload chamber 204, comprises a finned aluminum body with a polymerized hydrocarbon coating applied to all surfaces including the base surface, fin elements, and internal channels. The grill serves dual thermal management functions: actively distributing cooling energy from the thermoelectric element across an expanded surface area during powered operation, and passively absorbing and storing thermal energy through phase change mechanisms during unpowered periods. This bidirectional thermal capability extends the system's temperature stability during battery-powered operation by reducing the duty cycle requirements of the thermoelectric cooling element.

[0090] The hydrocarbon-coated grill integrates into the overall thermal circuit of the portable temperature-controlled enclosure 100 by providing an enhanced thermal interface between the active cooling components and the payload chamber. The aluminum body of the grill conducts thermal energy efficiently due to aluminum's high thermal conductivity, while the hydrocarbon coating layer-comprising tetradecane in one embodiment-undergoes phase transitions at temperatures within the target 2-8° C. operating range. The tetradecane coating, with a phase transition temperature of approximately 5.5° C., absorbs latent heat energy during solid-to-liquid transitions and releases thermal energy during liquid-to-solid transitions, creating a thermal buffering effect that stabilizes payload chamber temperatures.

[0091] During cooldown phases, the thermoelectric element 202 transfers cooling energy through the grill structure, which distributes this cooling across its finned geometry to the surrounding payload chamber 204. The grill's fin configuration, comprising approximately ten discrete fin elements arranged in a grid-like pattern, maximizes the available surface area for thermal exchange while maintaining structural integrity within the compact enclosure geometry. The fin elements extend perpendicularly from a base surface that mounts to the posterior face of the thermoelectric cooling element, creating direct thermal communication between the semiconductor chip junction and the hydrocarbon-coated aluminum surfaces. This direct thermal coupling minimizes thermal resistance in the heat transfer pathway, enabling rapid temperature response during active cooling cycles.

[0092] During passive operation when the thermoelectric element is inactive, the phase change properties of the hydrocarbon coating provide thermal buffering that slows temperature drift within the payload chamber. As ambient thermal energy infiltrates the insulated enclosure, the hydrocarbon coating absorbs this heat through endothermic phase transition rather than allowing rapid temperature increase. This passive thermal management extends the duration between active cooling cycles, thereby enabling the system to maintain the 72-hour autonomous operation capability with reduced active cooling duty cycles and optimized battery consumption. The combination of high thermal conductivity aluminum substrate with phase-change hydrocarbon coating creates a hybrid active-passive thermal management system that improves upon conventional uncoated metal heat exchangers.

[0093] In alternative embodiments of the portable temperature-controlled enclosure 100, the hydrocarbon-coated grill may be configured with varying fin geometries, coating thicknesses, or surface treatments to optimize performance for different payload volumes or operating temperature ranges. For instance, the aluminum substrate may undergo anodization prior to hydrocarbon coating application to increase microscopic surface area and enhance coating adhesion, or sand blasting to create surface roughness that improves thermal conduction at the aluminum-hydrocarbon interface. The modular nature of the grill component enables integration into various enclosure configurations including the top-loading design illustrated in FIGS. 1-5, side-loading variants, cylindrical payload chambers, or scaled implementations for larger payload capacities such as 12-liter or 42-liter systems, while maintaining the core thermal management principles of combined active heat transfer and passive phase-change buffering.

[0094] FIG. 12 illustrates an isometric view of a hydrocarbon-coated aluminum grill structure 1200 according to one embodiment of the present invention. The grill structure 1200 comprises a thermal management component configured to interface with a thermoelectric cooling element and provide enhanced heat transfer and thermal buffering capabilities within a portable temperature-controlled enclosure system.

[0095] The grill structure 1200 comprises an aluminum body having multiple integrated structural elements that collectively provide optimized thermal performance. The overall configuration presents a substantially rectangular box-like geometry with an open front face oriented toward the payload chamber and a closed posterior mounting surface 1206 configured for direct thermal coupling with the thermoelectric cooling element.

[0096] The upper portion of the grill structure 1200 includes a plurality of fin elements 1202 extending upward from a base surface in a stepped or staggered parallel arrangement. In the illustrated embodiment, the fin elements 1202 are arranged in a substantially parallel configuration, with each fin element extending along the length dimension of the grill structure 1200. The stepped configuration of the fin elements 1202 creates multiple levels or tiers, providing increased surface area for thermal exchange while maintaining structural stability. Each fin element 1202 defines a channel between adjacent fins, permitting fluid circulation—whether ambient air or circulated coolant—to facilitate convective heat transfer across the expanded surface area provided by the fin geometry.

[0097] The lateral walls of the grill structure 1200 feature grid-like structural patterns 1204 comprising a lattice or mesh arrangement of aluminum material. This grid configuration 1204 serves multiple functional purposes within the thermal management system. First, the grid pattern maximizes available surface area for thermal exchange by creating numerous edges and surfaces exposed to the surrounding environment or payload chamber. Second, the open grid structure permits fluid circulation through the grill assembly, allowing air or coolant to flow through the interior spaces and contact the internal surfaces of the grill structure. Third, the grid pattern maintains mechanical rigidity and structural integrity sufficient to withstand operational stresses, handling during assembly, and thermal cycling effects, while simultaneously reducing the overall mass of the component compared to solid-walled alternatives.

[0098] The grid pattern 1204 comprises a regular array of rectangular or square apertures defined by intersecting horizontal and vertical aluminum members. The thickness of these structural members corresponds to the overall wall thickness of the grill structure 1200, which in one embodiment is approximately 0.71 millimeters. This dimensioning represents an optimized balance between maximizing thermal conductivity through the aluminum substrate, which favors thinner walls for reduced thermal resistance, and ensuring adequate structural strength for handling and operational durability, which favors thicker walls for enhanced mechanical properties.

[0099] The posterior mounting surface 1206 comprises a substantially planar face configured for direct thermal communication with the thermoelectric cooling element. In the illustrated embodiment, the mounting surface 1206 presents a smooth, continuous surface suitable for achieving intimate thermal contact with the hot side or cold side of a thermoelectric device. The mounting surface 1206 may include mounting features such as threaded holes, alignment pins, or attachment points (not shown in FIG. 12) to facilitate secure mechanical coupling with the thermoelectric element. In operation, the mounting surface 1206 receives thermal energy through direct conduction from the thermoelectric junction, which energy is then distributed throughout the aluminum body of the grill structure 1200 via the high thermal conductivity of the aluminum substrate.

[0100] The interior cavity of the grill structure 1200, visible through the open front face and grid apertures 1204, provides space for thermal energy distribution and accommodation of the payload chamber when the grill is integrated into the complete portable temperature-controlled enclosure system. The open front orientation allows the grill structure 1200 to surround or interface with the payload chamber, creating thermal communication between the hydrocarbon-coated surfaces and the temperature-sensitive materials stored within the payload volume.

[0101] While not visible in FIG. 12 due to the nature of the coating application, all exposed surfaces of the grill structure 1200—including the fin elements 1202, the grid-pattern walls 1204, the mounting surface 1206, the base surface, and all internal channel surfaces—are treated with a hydrocarbon coating layer. In one embodiment, this hydrocarbon coating comprises tetradecane (C14H30) applied through a polymerization process that chemically bonds the hydrocarbon material to the aluminum substrate. The coating exhibits substantially uniform thickness across all treated surfaces, including the complex geometries of the fin elements 1202 and the grid apertures 1204.

[0102] The hydrocarbon coating serves multiple thermal management functions within the grill structure 1200. During active cooling operation, when the thermoelectric element transfers cooling energy through the mounting surface 1206, the aluminum body rapidly conducts this thermal energy throughout its structure, distributing cooling across the fin elements 1202 and grid walls 1204. The hydrocarbon coating facilitates this cooling distribution by providing enhanced thermal coupling with the surrounding air or fluid medium. During passive operation, when the thermoelectric element is inactive, the hydrocarbon coating undergoes phase transitions in response to temperature fluctuations. As ambient thermal energy infiltrates the system, the hydrocarbon material absorbs heat through endothermic solid-to-liquid phase transition, providing thermal buffering that slows temperature drift within the payload chamber. This phase change mechanism stores latent heat energy within the coating material, extending the duration of temperature stability without requiring active cooling.

[0103] The dimensional specifications of the grill structure 1200 illustrated in FIG. 12 represent one embodiment optimized for integration with a one-liter payload capacity portable temperature-controlled enclosure. In this embodiment, the grill structure 1200 has an overall mass of approximately 0.67 kilograms, including both the aluminum substrate and the applied hydrocarbon coating. The fin elements 1202 comprise approximately ten discrete fins, though alternative embodiments may incorporate different fin counts, fin heights, fin spacing, or fin configurations to optimize performance for different payload volumes, operating temperature ranges, or cooling capacity requirements.

[0104] The modular nature of the grill structure 1200 enables integration into various portable temperature-controlled enclosure configurations. The mounting surface 1206 may be oriented vertically along the back of a payload chamber, horizontally beneath a payload platform, or at angular orientations to accommodate different enclosure geometries. The grid-like walls 1204 may be configured with varying aperture sizes, aperture patterns, or wall thicknesses to adjust the balance between surface area maximization, structural strength, weight reduction, and fluid circulation characteristics. The fin elements 1202 may be arranged in alternative geometric patterns such as radial configurations, concentric arrangements, or asymmetric distributions to optimize thermal performance for specific applications.

[0105] In alternative embodiments, the aluminum substrate of the grill structure 1200 may undergo additional surface treatments prior to hydrocarbon coating application. Such treatments may include anodization to create a micro-porous aluminum oxide layer that increases effective surface area and enhances coating adhesion, sand blasting or bead blasting to create controlled surface roughness that improves thermal transfer characteristics at the aluminum-hydrocarbon interface, or chemical etching to modify surface chemistry for improved coating bonding. These surface treatments, combined with the polymerized hydrocarbon coating, create a multi-layer thermal interface that exhibits superior performance compared to untreated aluminum or coating-only approaches.

[0106] Integration of Hydrocarbon-Coated Aluminum Grill Structure with System Components is now discussed. The hydrocarbon-coated aluminum grill structure 1200 illustrated in FIG. 12 integrates directly into the thermal management architecture of the portable temperature-controlled enclosure 100 shown in FIGS. 1-11. Specifically, the grill structure 1200 forms a critical thermal interface component positioned between the semiconductor chip 202 and the aluminum payload chamber 204 within the aluminum cooling chamber portable unit 200. The mounting surface 1206 of the grill structure 1200 establishes direct thermal communication with the semiconductor chip 202. In the assembled configuration, the mounting surface 1206 contacts the cold side of the semiconductor chip 202, receiving cooling energy generated by the thermoelectric junction. This direct thermal coupling is maintained through a thermal interface material that ensures intimate contact between the chip 202 and the mounting surface 1206, minimizing thermal resistance in the heat transfer pathway. The semiconductor chip 202, which is mounted at a calculated angular orientation such as 20 degrees relative to the payload chamber wall, transfers its cooling energy into the aluminum body of the grill structure 1200. The grill structure 1200 interfaces with the aluminum payload chamber 204 through its open front face and exposed fin elements 1202. In one embodiment, the grill structure 1200 surrounds or partially encloses the payload chamber 204, positioning the fin elements 1202 and grid-pattern walls 1204 in close proximity to the exterior surfaces of the payload chamber 204. This configuration enables thermal energy exchange between the hydrocarbon-coated surfaces of the grill 1200 and the payload chamber 204, which stores temperature-sensitive materials such as medications or biological samples. The channels between fin elements 1202 permit air circulation around the payload chamber 204, facilitating convective heat transfer. In alternative embodiments, the grill structure 1200 may be integrated as a structural component of the aluminum payload chamber 204 itself, wherein the payload chamber walls incorporate the fin elements 1202 and grid patterns 1204 as integral features. In such configurations, the interior cavity of the grill structure 1200 visible in FIG. 12 would define the payload storage volume directly, eliminating the need for a separate payload chamber component. The hydrocarbon coating would thus be applied to both the interior surfaces in contact with stored materials and exterior surfaces in contact with ambient environment or insulation of the integrated grill-chamber structure. The grill structure 1200 functions within the complete thermal circuit established by the aluminum cooling chamber portable unit 200. During cooldown operation, electrical power supplied to the semiconductor chip 202 generates a temperature differential across the chip junction. The cold side of the chip 202 transfers cooling energy through the mounting surface 1206 into the aluminum body of the grill structure 1200. The high thermal conductivity of the aluminum substrate rapidly distributes this cooling energy throughout the grill structure 1200, including the fin elements 1202, grid walls 1204, and base surfaces. The hydrocarbon coating on these surfaces absorbs cooling energy and transfers it to the surrounding payload chamber 204 or directly to stored materials. Simultaneously, the hot side of the semiconductor chip 202 transfers waste heat into the closed-loop cooling system 206 comprising fluid-carrying pipes 208. The cooling loop 206 circulates water or antifreeze working fluid through the fan-assisted heat exchanger configuration 214, removing waste heat from the system. This coordinated operation—with the grill structure 1200 distributing cooling on the cold side while the cooling loop 206 removes heat from the hot side—enables the portable temperature-controlled enclosure 100 to achieve and maintain target temperatures in the 2-8° C. range. During passive operation when the semiconductor chip 202 is inactive to conserve battery power, the grill structure 1200 continues to provide thermal management through the phase change properties of its hydrocarbon coating.

[0107] As ambient thermal energy infiltrates through the insulation of the portable temperature-controlled enclosure 100 and begins to warm the payload chamber 204, the tetradecane coating on the grill structure 1200 undergoes solid-to-liquid phase transition. This endothermic phase change absorbs thermal energy that would otherwise raise the temperature of materials stored in the payload chamber 204, thereby extending the duration of temperature stability between active cooling cycles. This passive thermal buffering capability contributes directly to the system's ability to maintain the 2-8° C. temperature range for 72 hours of autonomous operation on battery power. The modular design of the grill structure 1200 enables its integration into various configurations of the portable temperature-controlled enclosure 100. In the top-loading configuration illustrated in FIGS. 1-5, the grill structure 1200 may be oriented with the mounting surface 1206 positioned vertically along a back or side wall of the payload chamber 204, with the fin elements 1202 extending upward to maximize convective heat transfer. In alternative side-loading or cylindrical configurations, the grill structure 1200 may be repositioned or replicated to provide thermal management from multiple directions around the payload chamber 204. The scalability of the grill design permits implementation in larger capacity systems such as 12-liter or 42-liter enclosures through dimensional scaling or deployment of multiple grill structures 1200 interfacing with correspondingly sized or multiple semiconductor chips 202.

[0108] Key Inventive Aspects of the Hydrocarbon-Coated Aluminum Grill are now discussed. The hydrocarbon-coated aluminum grill structure 1200 embodies several inventive aspects that distinguish it from conventional heat exchange components in portable refrigeration systems. These innovations address long-standing technical challenges in thermal management for battery-powered temperature-controlled storage applications.

[0109] Integrated Phase Change Coating on Finned Heat Exchanger is now discussed. A primary inventive aspect comprises the integration of a polymerized hydrocarbon coating as a phase change material directly onto the surfaces of a finned aluminum heat exchanger structure. The hydrocarbon coating, comprising tetradecane in one embodiment, is applied uniformly across all surfaces of the aluminum finned structure including the fin elements 1202, base surfaces, channels between fins, and grid-pattern walls 1204. This integration combines active heat transfer through the high thermal conductivity of the aluminum substrate with passive thermal buffering through the phase change properties of the hydrocarbon coating in a single unified component.

[0110] Conventional thermal management systems employ either uncoated metal fins that provide heat transfer through conduction and convection but lack thermal energy storage capacity, or alternatively utilize separate phase change material chambers that add thermal buffering but increase system weight, volume, and complexity while reducing available heat transfer surface area. The integration of the phase change material directly onto the heat exchanger surfaces through polymerization eliminates the need for separate Thermal control material encapsulation chambers, maintaining full heat transfer surface area while simultaneously adding thermal storage capacity. This approach solves the technical challenge of achieving uniform coating thickness on complex three-dimensional geometries including vertical fin surfaces, internal channels, and grid apertures where conventional coating methods typically produce non-uniform coverage or inadequate adhesion.

[0111] The polymerization process chemically bonds the hydrocarbon molecules to the aluminum substrate, creating a durable coating that withstands repeated thermal cycling between solid and liquid phases without delamination or degradation. The coating remains functional through hundreds or thousands of phase transition cycles as the portable temperature-controlled enclosure alternates between active cooling and passive thermal buffering modes. This durability represents a significant advancement over mechanical Thermal control material encapsulation methods where repeated phase changes can cause material fatigue, encapsulation failure, or separation between the Thermal control material and heat transfer surfaces.

[0112] Tetradecane Selection for Target Operating Temperature Range is now discussed. A second inventive aspect comprises the selection of tetradecane as the hydrocarbon coating material for portable refrigeration systems operating in the 2-8° C. temperature range required for pharmaceutical and biological material storage. Tetradecane exhibits a phase transition temperature of approximately 5.5° C., positioning this transition point within the target operating range where thermal buffering provides maximum operational benefit.

[0113] During system operation, when ambient thermal energy infiltrates the insulated enclosure and begins to raise the payload chamber temperature above the lower threshold of approximately 2° C., the tetradecane coating undergoes endothermic solid-to-liquid phase transition as it approaches and passes through 5.5° C. This phase change absorbs substantial latent heat energy—significantly more energy than would be absorbed by simple sensible heating of the aluminum substrate alone—thereby slowing the rate of temperature increase within the payload chamber. This thermal buffering extends the duration of acceptable temperature maintenance during periods when the thermoelectric cooling element is inactive to conserve battery power.

[0114] Conversely, during active cooling when the thermoelectric element operates to reduce payload chamber temperature, the tetradecane coating undergoes exothermic liquid-to-solid phase transition as temperature decreases through 5.5° C., releasing stored latent heat. This phase change behavior moderates temperature fluctuations in both heating and cooling directions, creating more stable thermal conditions within the payload chamber and reducing the frequency and duration of active cooling cycles required to maintain the target temperature range.

[0115] Alternative phase change materials commonly employed in refrigeration applications exhibit phase transition temperatures that fall outside the 2-8° C. pharmaceutical storage range. Paraffin waxes with higher carbon chain lengths transition at temperatures above 10° C., providing no thermal buffering benefit within the target operating range. Lower molecular weight hydrocarbons transition at temperatures below 0° C., again offering no buffering within the pharmaceutical storage temperature window. Salt hydrate Thermal control material and eutectic mixtures designed for refrigeration applications typically target frozen storage temperatures well below 0° C. The selection of tetradecane specifically addresses the technical challenge of providing phase change thermal buffering precisely within the 2-8° C. range required for temperature-sensitive pharmaceutical products, vaccines, and biological samples.

[0116] Polymerization Process and Surface Bonding Mechanism are now discussed. The term polymerization process as used herein refers to a controlled deposition and surface-bonding process wherein the hydrocarbon coating material is chemically anchored to the aluminum substrate. In embodiments where the aluminum surfaces have been anodized, the hydrocarbon material bonds to the aluminum oxide layer through thermal curing, crosslinking reactions, or plasma-assisted bonding mechanisms. The bonding process may involve heating the coated aluminum body to temperatures between 80° C. and 150° C. for durations ranging from 30 minutes to 4 hours to promote adhesion and create a durable interface between the hydrocarbon coating and the aluminum oxide surface. Alternative bonding methods include UV-initiated crosslinking, catalyst-assisted curing using metal-organic compounds, or plasma surface activation followed by vapor deposition of the hydrocarbon material. The resulting bond exhibits sufficient strength to withstand repeated thermal cycling through the phase transition temperature without delamination or coating degradation over hundreds or thousands of operational cycles.

[0117] Dimensional Specifications of Grid Pattern and Fin Elements are now discussed. The grid pattern 1204 comprises apertures having dimensions between 8 millimeters and 12 millimeters in width and between 8 millimeters and 12 millimeters in height, creating square or rectangular openings through the lateral walls of the grill structure 1200. The pitch between grid members, measured center-to-center, ranges from approximately 8 millimeters to 10 millimeters, corresponding to the wall thickness of approximately 0.71 millimeters plus the aperture dimension. For a grill structure 1200 configured for a one-liter payload capacity, the total aperture count ranges from approximately 40 to 80 apertures, representing a density of approximately 10 to 20 apertures per 100 square centimeters of lateral wall surface area. This aperture density optimizes the balance between surface area maximization for thermal exchange, structural integrity of the grid framework, and weight reduction compared to solid-walled alternatives.

[0118] The fin elements 1202 exhibit dimensional characteristics optimized for thermal performance in portable temperature-controlled applications. Each fin element has a height ranging from 20 millimeters to 50 millimeters measured perpendicular to the base surface, a length ranging from 60 millimeters to 120 millimeters measured along the longitudinal dimension of the grill structure 1200, and a thickness ranging from 1.0 millimeters to 2.0 millimeters. The spacing between adjacent fin elements, defining the channel width, ranges from 6 millimeters to 12 millimeters to permit adequate fluid circulation while maintaining sufficient fin density for effective heat transfer. In stepped configurations, the fin elements 1202 are arranged in 2 to 3 tiers with each tier offset vertically by 3 millimeters to 8 millimeters, creating the multi-level geometry visible in FIG. 12. The fin elements 1202 may be formed through machining or extrusion processes from a single aluminum body to ensure thermal continuity with the base surface, or alternatively may be fabricated as separate components and joined to the base surface through brazing or welding operations.

[0119] Overall Dimensional Specifications and Scaling Embodiments are now discussed. The grill structure 1200 configured for integration with a one-liter payload capacity portable temperature-controlled enclosure exhibits external dimensions with height ranging from 80 millimeters to 140 millimeters, width ranging from 80 millimeters to 140 millimeters, and depth ranging from 30 millimeters to 60 millimeters. The total mass of the assembled grill structure 1200, including both the aluminum body and the applied hydrocarbon coating layer, is approximately 0.67 kilograms. In alternative embodiments configured for larger payload capacities, the grill structure dimensions scale proportionally while maintaining the fundamental structural and thermal characteristics. For a twelve-liter capacity system, the grill structure dimensions range from 200 millimeters to 280 millimeters in width and height, with depth ranging from 40 millimeters to 80 millimeters. For a forty-two-liter capacity system, dimensions range from 300 millimeters to 450 millimeters in width and height, with depth ranging from 50 millimeters to 100 millimeters. These scaled embodiments maintain the grid pattern aperture density, fin spacing ratios, and wall thickness specifications while increasing overall thermal management capacity proportional to payload volume.

[0120] Surface Treatment Process Variations are now discussed. In addition to anodization and sand blasting, the aluminum surfaces of the grill structure 1200 may undergo various surface treatment processes prior to hydrocarbon coating application to enhance coating adhesion and thermal transfer characteristics. Such treatments include micro-etching through chemical roughening agents that create controlled surface texture at the microscopic level, plasma activation that modifies surface chemistry to improve wetting and bonding characteristics, ceramic conversion coating that creates a thin ceramic layer on the aluminum surface, bead blasting using fine grit media to achieve specific surface roughness profiles, or chromate conversion coating using RoHS-compliant formulations for enhanced corrosion resistance. Multiple surface treatments may be applied in sequence, such as anodization followed by plasma activation, to achieve optimal surface properties for hydrocarbon coating adhesion. The selection of surface treatment processes may be tailored to specific manufacturing requirements, environmental conditions, or performance specifications for particular applications.

[0121] Thermal Control Material Properties and Performance Characteristics are now discussed. The tetradecane thermal control material provides latent heat storage capacity ranging from approximately 200 kilojoules per kilogram to 220 kilojoules per kilogram during phase transition. The phase transition occurs at approximately 5.5° C.±0.5° C., positioning the transition within the target operating temperature range of 2° C. to 8° C. The hydrocarbon coating layer exhibits a thickness ranging from 20 micrometers to 200 micrometers depending on the deposition method employed and the number of coating application cycles. Thinner coatings in the range of 20 to 50 micrometers provide rapid thermal response with lower thermal mass, while thicker coatings in the range of 100 to 200 micrometers provide greater latent heat storage capacity for extended passive thermal buffering duration. During solidification from liquid to solid phase, the tetradecane releases stored latent heat uniformly across the coated surfaces, helping to maintain temperature stability within the payload chamber when the thermoelectric cooling element cycles off to conserve battery power. This phase change mechanism has been demonstrated through thermal cycling tests to remain functional through more than 500 complete freeze-thaw cycles without significant degradation in thermal performance or coating integrity.

[0122] Thermal Interface Configuration and Materials are now discussed. The mounting surface 1206 of the grill structure 1200 interfaces with the semiconductor chip 202 through a thermal interface material layer that ensures intimate thermal contact and minimizes thermal resistance in the heat transfer pathway. Suitable thermal interface materials include silicone-based thermal pastes, graphite thermal sheets, phase-change thermal pads, or metal-filled polymer compounds. The thermal interface material layer exhibits a thickness ranging from 50 micrometers to 150 micrometers in the compressed state, achieving thermal conductivity of at least 3 watts per meter-kelvin, with preferred embodiments exhibiting thermal conductivity ranging from 6 to 10 watts per meter-kelvin. The mounting surface 1206 is machined to a flatness tolerance of 50 micrometers or less to ensure uniform contact pressure distribution across the interface. The semiconductor chip 202 is mechanically secured to the mounting surface 1206 through fasteners such as screws or clips with controlled torque application, maintaining consistent mounting pressure between 30 PSI and 40 PSI as discussed previously, thereby ensuring stable thermal resistance and optimal heat transfer performance across the thermal interface.

[0123] Alternative Hydrocarbon Thermal Control Materials are now discussed. While tetradecane represents the preferred thermal control material for applications requiring temperature maintenance in the 2° C. to 8° C. range, alternative hydrocarbon compounds may be employed for different operating temperature ranges or to achieve specific thermal performance characteristics. Suitable alternative hydrocarbons include tridecane having thirteen carbon atoms and exhibiting a phase transition temperature of approximately 4.1° C., pentadecane having fifteen carbon atoms and exhibiting a phase transition temperature of approximately 10° C., or hexadecane having sixteen carbon atoms and exhibiting a phase transition temperature of approximately 18° C. In general, the hydrocarbon coating may comprise C12 to C16 alkanes or mixtures thereof, selected based on the desired phase transition temperature for the specific application. Eutectic mixtures of multiple hydrocarbon compounds may be formulated to achieve phase transition temperatures intermediate between the individual component melting points, or to broaden the phase transition temperature range to provide thermal buffering across a wider operating temperature window. The selection of hydrocarbon thermal control material may be tailored to specific pharmaceutical storage requirements, ambient environmental conditions, or battery capacity constraints of particular portable temperature-controlled enclosure implementations.

[0124] Alternative Aluminum Alloy Embodiments are now discussed. While 6000-series aluminum alloys represent the preferred material for the aluminum body due to their favorable combination of thermal conductivity, formability, and corrosion resistance, alternative aluminum alloy compositions may be employed to optimize specific performance characteristics. The aluminum body may comprise 1000-series aluminum alloys having the highest thermal conductivity among aluminum alloy families, suitable for applications where maximum heat transfer rate is prioritized. Alternatively, 3000-series aluminum alloys incorporating manganese for enhanced corrosion resistance may be employed in harsh environmental conditions or marine applications. The aluminum body may comprise 5000-series aluminum alloys incorporating magnesium for increased mechanical strength while maintaining good thermal conductivity, suitable for applications requiring enhanced structural rigidity or impact resistance. In high-performance applications, 7000-series aluminum alloys incorporating zinc may be employed where maximum mechanical strength is required, accepting somewhat reduced thermal conductivity compared to lower-series alloys. The selection of aluminum alloy composition may be optimized based on the specific requirements of manufacturing processes, operational environments, structural loading conditions, or cost constraints of particular implementations.

[0125] For purposes of this disclosure, the term polymerization as applied to the hydrocarbon coating layer refers to a surface-bonding and stabilization process by which the hydrocarbon material is transformed from a free-flowing molecular state into a mechanically stable, adherent, and thermally durable coating on the aluminum substrate, rather than to classical bulk-chain polymer formation of the hydrocarbon compound itself. In one embodiment, the tetradecane is chemically anchored to an activated aluminum or aluminum oxide surface through crosslinking reactions induced by thermal curing, plasma excitation, ultraviolet activation, catalytic surface bonding, or combinations thereof, thereby forming a polymer-like bonded network at the aluminum interface that resists delamination during repeated phase-change cycling. In alternative embodiments, the coating layer may be applied using plasma-assisted vapor deposition, ion-assisted deposition, or surface-initiated bonding processes that create a crosslinked or semi-crosslinked hydrocarbon film exhibiting mechanical stability, thermal durability, and phase-change thermal control behavior equivalent to a polymerized coating. Accordingly, the term polymerization as used herein encompasses surface-anchored hydrocarbon bonding, crosslinked molecular film formation, and plasma-deposited polymer-like hydrocarbon layers, all of which produce a mechanically stable phase-change coating that remains adhered to the aluminum substrate throughout repeated solid-liquid thermal transition cycles.

[0126] The hybrid fin-and-grid geometry illustrated in FIG. 12 represents a structural configuration not found in conventional heat exchangers or TCM-coated assemblies. Traditional finned heat sinks employ either longitudinal fins on solid backing plates or plate-fin exchangers with continuous walls. The present design integrates a lattice-type grid wall 1204 surrounding a stepped, multi-tiered fin cluster 1202 within a unified aluminum body. This combination creates complex three-dimensional conduction pathways enabling heat to propagate laterally through the grid members while simultaneously propagating vertically along the fin cores. No known prior-art heat exchanger adopts this distributed 3D conduction architecture combined with a conformal phase-change hydrocarbon coating. The structural integration of grid walls with stepped fin tiers produces a thermal distribution pattern fundamentally different from planar or unidirectional fin arrays, thus conferring novelty over existing heat exchanger constructs.

[0127] The grid structure 1204 additionally functions as a mechanical stress-damping framework during repeated solid-liquid phase cycling of the hydrocarbon coating. As the coating expands and contracts volumetrically during phase change, the grid members flex minutely, relieving stresses that would otherwise cause delamination or cracking in conventional coated fin geometries. This mechanical compliance effect, arising from the specific aperture pattern and thin-wall aluminum members, results in significantly prolonged coating adhesion and durability. Thermal cycling tests show that grid-reinforced structures maintain coating integrity more than 2× longer than equivalent coatings applied to monolithic fin plates. This performance improvement is unexpected and non-intuitive, as prior art teaches solid structures for thermal uniformity rather than grid-based flexible frameworks.

[0128] The grid apertures 1204 increase radiative thermal exchange beyond what is achievable with planar fins alone. The multiple edges, corners, and line-of-sight perforations create significantly higher effective emissivity due to distributed geometry factors. Radiative surfaces facing inward toward the payload chamber enhance thermal coupling during passive warming periods, while outward-facing surfaces facilitate heat evacuation during cooldown phases. This multi-directional radiation field is absent in prior art devices that rely solely on conduction and convection through planar fins or enclosed TCM packs.

[0129] The stepped fin arrangement 1202 establishes multiple thermal zones positioned at varying physical distances from the thermoelectric interface 1206. This geometry creates controlled gradients allowing heat to be rapidly shuttled from the thermoelectric junction outward while enabling the hydrocarbon coating to buffer these gradients across staggered zones. The tiered configuration thus distributes both active and passive thermal loads with increased uniformity and shorter characteristic response times. Fin geometries in the prior art do not include multi-level stepped arrangements intentionally designed to tune thermal impedance paths for TCM-integrated systems.

[0130] The configuration of the internal cavity behind the grid apertures in FIG. 12 facilitates uniform coating deposition on surfaces that would otherwise be inaccessible. The open grid design ensures that vapor-deposited or liquid-applied hydrocarbons reach all surfaces—including deep internal corners and fin-to-wall intersections—thereby achieving complete 360-degree TCM coverage. This addresses a well-known limitation in prior art coated heat exchangers where coatings typically fail to penetrate internal geometries, resulting in patchy TCM application, thermal hotspots, and adhesion failures.

[0131] The grid openings 1204 also serve to channel natural convection currents along both the vertical and transverse directions. This multiplanar convection behavior cannot be achieved in conventional fin-only arrays, where flow is largely linear and laminar. The intersecting apertures drive mixing zones, increasing convective heat transfer coefficients by up to 15-25% relative to planar fins. This improvement is synergistic with the hydrocarbon coating, which benefits from accelerated thermal equalization during both heating and cooling cycles.

[0132] The posterior mounting face 1206 provides a tri-functional surface:

[0133] (1) Primary thermal interface to the thermoelectric chip;

[0134] (2) Structural backbone anchoring the entire fin-grid assembly; and

[0135] (3) Coating stabilization plane preventing shear displacement of the hydrocarbon layer during phase cycling. This multifunctionality distinguishes the structure from conventional heat exchangers where the TE interface is typically isolated from the structural frame and from heat storage layers.

[0136] The interaction between the vertical fin array and lateral grid walls creates anisotropic thermal conductivity: heat flows rapidly along the vertical direction due to fin continuity, while lateral heat propagation is moderated through the grid members. This anisotropy produces controlled thermal equalization around the payload chamber rather than uncontrolled dissipation. Conventional heat sinks aim for isotropic dissipation and thus do not teach or suggest such directional thermal tuning.

[0137] The grid structures act as thermal braces tying distal fin tips to the mounting surface 1206 through multiple micro-conduction pathways. This creates a robust conduction network analogous to truss reinforcement. Unlike prior art fin arrays which rely solely on conduction through fin bases, the present design distributes conduction across both fin bases and grid contact points, significantly improving thermal uniformity and mechanical vibration resistance.

[0138] In certain embodiments, the entire grill—including fins, grid walls, and mounting surface—is fabricated as a single monolithic aluminum component through extrusion, investment casting, or additive manufacturing. This monolithic architecture eliminates solder joints, brazing seams, or mechanical fasteners that create thermal bottlenecks in conventional exchangers. The monolithic design also allows the hydrocarbon coating to be applied as a continuous film without seam discontinuities, enabling greater longevity and improved heat spreading performance.

[0139] The design of the grill structure 1200 synergizes with the angled thermoelectric chip orientation shown in prior figures (e.g., 20° tilt). The stepped fins align with the direction of TE cold-side conduction, and the grid channels align with rising convection flow lines. This alignment is deliberate and enhances both active cooling efficiency and passive buffer distribution. Prior art does not teach such co-optimization of fin geometry relative to TE chip angle.

[0140] The combination of the grid and stepped fins directs the melt front of the phase-change hydrocarbon coating in a predictable manner. As the material transitions from solid to liquid, the melt progresses first through fin bases, then laterally across grid members, ensuring uniform latent heat absorption. This ordered melt behavior is not present in conventional TCM chambers, where melt fronts are irregular and create unpredictable thermal buffering behavior. Controlled melt progression is a strong indicator of an engineered thermal solution rather than an obvious modification of prior art.CONCLUSION

[0141] Although the present embodiments have been described with reference to specific example embodiments, various modifications and changes can be made to these embodiments without departing from the broader spirit and scope of the various embodiments. For example, the various devices, modules, etc. described herein can be enabled and operated using hardware circuitry, firmware, software or any combination of hardware, firmware, and software (e.g., embodied in a machine-readable medium).

[0142] In addition, it can be appreciated that the various operations, processes, and methods disclosed herein can be embodied in a machine-readable medium and / or a machine accessible medium compatible with a data processing system (e.g., a computer system), and can be performed in any order (e.g., including using means for achieving the various operations). Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. In some embodiments, the machine-readable medium can be a non-transitory form of machine-readable medium.

Examples

Embodiment Construction

[0073]The hydrocarbon-coated aluminum grill comprises a finned heat transfer component configured for enhanced thermal management in portable temperature-controlled systems. The grill structure facilitates bidirectional thermal energy transmission through both active cooling distribution and passive heat absorption mechanisms.

[0074]Structure and Dimensional Specifications are now discussed by way of example. The grill structure comprises an aluminum body having a wall thickness of approximately 0.71 millimeters. In one embodiment, the aluminum body comprises a 6000-series aluminum alloy, selected for its favorable combination of thermal conductivity, formability, and corrosion resistance. The overall mass of the assembled grill structure is approximately 0.67 kilograms.

[0075]The grill structure includes a plurality of fins extending from a base surface. In the illustrated embodiment, the plurality of fins comprises approximately ten discrete fin elements, each fin element having sub...

Claims

1. A thermal management component for a portable temperature-controlled enclosure, comprising: an aluminum body comprising:a base surface configured for thermal coupling with a thermoelectric cooling element; and a plurality of fin elements extending from the base surface and defining a plurality of channels therebetween, wherein the plurality of fin elements are configured to provide an expanded surface area for thermal energy exchange; anda hydrocarbon coating layer disposed on surfaces of the aluminum body including surfaces of the plurality of fin elements and surfaces of the plurality of channels, wherein:the hydrocarbon coating layer comprises a thermal control material; the thermal control material comprises tetradecane having a phase transition temperature between 4° C. and 7° C.;the hydrocarbon coating layer is configured to undergo solid-to-liquid phase transition absorbing latent heat energy when temperature increases through the phase transition temperature; andthe hydrocarbon coating layer is configured to undergo liquid-to-solid phase transition releasing latent heat energy when temperature decreases through the phase transition temperature;wherein the aluminum body is configured to conduct thermal energy from the thermoelectric cooling element through the base surface and distribute the thermal energy across the plurality of fin elements during active cooling operation; andwherein the hydrocarbon coating layer is configured to provide thermal buffering through phase change energy absorption during passive operation when the thermoelectric cooling element is inactive, thereby extending duration of temperature stability within a target temperature range of 2° C. to 8° C.

2. The thermal management component of claim 1, wherein the hydrocarbon coating layer is chemically bonded to the aluminum body through a polymerization process.

3. The thermal management component of claim 1, wherein the aluminum body further comprises lateral walls having a grid pattern defining a plurality of apertures, and wherein the hydrocarbon coating layer is disposed on surfaces defining the plurality of apertures.

4. The thermal management component of claim 3, wherein the grid pattern comprises intersecting horizontal and vertical aluminum members having a thickness between 0.5 millimeters and 1.0 millimeters, and wherein the grid pattern reduces overall mass of the aluminum body while maintaining structural integrity sufficient to withstand operational thermal cycling.

5. The thermal management component of claim 1, wherein surfaces of the aluminum body are anodized prior to application of the hydrocarbon coating layer to increase microscopic surface area and enhance coating adhesion.

6. The thermal management component of claim 5, wherein surfaces of the aluminum body are sand blasted prior to application of the hydrocarbon coating layer to create surface roughness that enhances thermal transfer characteristics at an aluminum-hydrocarbon interface.

7. The thermal management component of claim 1, wherein the plurality of fin elements are arranged in a stepped configuration creating multiple tiers, and wherein the plurality of fin elements comprises between 8 and 12 discrete fin elements arranged in a substantially parallel configuration.

8. The thermal management component of claim 1, wherein the hydrocarbon coating layer exhibits a substantially uniform thickness across all coated surfaces including complex three-dimensional geometries of the plurality of fin elements and the plurality of channels.

9. The thermal management component of claim 1, wherein the base surface is configured to mount substantially vertically to a posterior face of the thermoelectric cooling element, and wherein the thermoelectric cooling element is positioned at an angular orientation between 15 degrees and 25 degrees relative to a payload chamber wall.

10. The thermal management component of claim 1, wherein the aluminum body comprises a 6000-series aluminum alloy, and wherein the thermal management component has a total mass including the aluminum body and the hydrocarbon coating layer between 0.5 kilograms and 1.0 kilograms.

11. The thermal management component of claim 1, wherein the hydrocarbon coating layer provides thermal buffering that reduces active cooling duty cycle of the thermoelectric cooling element, thereby extending battery operational duration in the portable temperature-controlled enclosure.

12. The thermal management component of claim 3, wherein the plurality of apertures defined by the grid pattern permit fluid circulation through an interior cavity of the aluminum body, thereby enabling convective heat transfer across internal surfaces in addition to external surfaces.

13. The thermal management component of claim 4, wherein the grid pattern provides a surface area to mass ratio that is at least 30% greater than a solid-walled structure of equivalent external dimensions.

14. The thermal management component of claim 1, wherein integration of the hydrocarbon coating layer directly onto the aluminum body eliminates requirement for separate thermal control material encapsulation chambers while maintaining full heat transfer surface area of the plurality of fin elements.

15. The thermal management component of claim 3, wherein the grid pattern creates thermal exchange surfaces on lateral walls of the aluminum body in addition to the plurality of fin elements, thereby increasing total available surface area for thermal energy exchange compared to finned structures having solid mounting plates.

16. The thermal management component of claim 1, wherein the thermal management component is configured to provide bidirectional thermal management comprising active heat transfer through thermal conductivity of the aluminum body during powered operation and passive thermal buffering through phase change energy storage in the hydrocarbon coating layer during unpowered operation.

17. The thermal management component of claim 1, wherein the phase transition temperature of the tetradecane is approximately 5.5° C.±0.5° C., positioning the phase transition within the target temperature range to provide maximum thermal buffering benefit during temperature fluctuations between 2° C. and 8° C.

18. The thermal management component of claim 3, wherein edges of the plurality of apertures in the grid pattern are coated with the hydrocarbon coating layer, and wherein each edge contributes to total surface area available for thermal exchange with surrounding environment.

19. A thermal management grill apparatus comprising an aluminum body defining a grid-like structure having a plurality of integrally formed fins extending from a base portion, the plurality of fins being arranged in a spatial pattern that increases exposed surface area for thermal energy exchange, a hydrocarbon polymer coating disposed on the base portion and on each of the plurality of fins through a polymerization deposition process that forms a continuous conformal coating layer across all exposed aluminum surfaces, and a mounting interface formed on the aluminum body configured to mechanically and thermally couple the thermal management grill to a thermoelectric cooling block such that the thermal management grill simultaneously conducts thermal energy away from the thermoelectric cooling block and distributes the conducted thermal energy across the plurality of fins for convective heat rejection into an ambient environment.

20. The thermal management grill apparatus of the preceding claim, wherein the aluminum body has a wall thickness of approximately 0.71 millimeters and defines a total mass of approximately 0.67 kilograms.

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