43 results about "Phase change temperature" patented technology

This invention discloses a steel slag cement stone phase change material and its preparation method. The steel slag cement stone phase change material comprises the following components by weight: 50-65 parts cement matrix; 15-25 parts phase change temperature-regulating steel slag filler; 15-25 parts phase change temperature-regulating mineral filler; the phase change temperature-regulating steel slag filler comprises the following components by weight: 10-15 parts steel slag powder, 3-6 parts first phase change material, and 2-4 parts graphene powder; the phase change temperature-regulating mineral filler comprises the following components by weight: 8-12 parts metakaolin, 3-6 parts second phase change material, and 2-4 parts hexagonal boron nitride. The phase change composite material of this invention can absorb and release heat in different phase change temperature zones to delay road surface heating and reduce peak temperature; the phase change material has high encapsulation efficiency and is not prone to leakage during the melting period; at the same time, it maintains or improves the mechanical strength, wear resistance, and thermal conductivity of the cement matrix, thereby meeting the requirements of road engineering construction and service.

This invention relates to high-energy-density phase change composite materials, their preparation methods, and applications, belonging to the field of phase change composite material technology. To address the problems of low energy density, insufficient mechanical properties, and poor processability of current phase change materials, this invention provides a high-energy-density phase change composite material, specifically a lightweight porous cellulose phase change composite aerogel. Internally, it consists of a three-dimensional network framework formed by the cross-linking of vinyl-functionalized cellulose nanocrystals and cellulose nanofibers. The phase change material is uniformly loaded within the pores of this three-dimensional network, with a loading amount of 65.53~91.02 wt%. The phase change temperature range of the composite material is 20~80℃. This invention's phase change composite material, relying on a hierarchical confinement structure, achieves efficient encapsulation and high loading of the phase change material, with a phase change enthalpy as high as 133.2 J / g. It also possesses excellent mechanical and thermal cycling stability and 3D printing performance, making it suitable for scenarios with wide temperature fluctuations and applicable to the field of intelligent thermal management.

The application provides a slow heat-storage-heat conduction synergic temperature control anti-cracking cement-based material and a preparation method thereof, and relates to the technical field of cement-based building materials. The material constructs a slow heat-storage-heat conduction synergic temperature control system by introducing a slow heat polymer, phase change capsules with different phase change temperature thresholds and liquid alloy heat conduction materials into a cement base. The slow heat polymer is used for delaying the early hydration reaction of cement and reducing the initial heat release rate. The phase change capsules with different phase change temperature thresholds absorb hydration heat in stages during the hydration process, realizing the step-by-step regulation of hydration temperature rise. The liquid alloy heat conduction material has the characteristics of phase change heat storage and high heat conduction, and can form an efficient heat transfer channel in the cement base, promote the uniform diffusion of heat and reduce the local temperature gradient. The synergistic effect of the three makes the hydration heat release peak present a hump distribution, effectively inhibits the temperature rise peak and temperature stress in the hydration process of cement, and significantly improves the anti-cracking performance of the cement-based material.

This invention belongs to the field of intelligent actuators and flexible actuators, and relates to a segmented shape memory alloy driven actuator with adjustable stiffness and its control method. The actuator includes a flexible shell, an isolation element, a shape memory alloy driving element, and a phase change stiffness control material. The isolation element divides the flexible shell into multiple axially arranged cavity structures. The phase change stiffness control material fills each cavity, and the phase change temperatures are not completely identical. Each temperature parameter and driving force satisfies a preset matching relationship. The control method involves controlling the heating temperature of the shape memory alloy driving element to sequentially unlock the equivalent stiffness of the cavities through phase changes of the phase change stiffness control material. This allows for multi-segment controllable equivalent stiffness adjustment under a single driving source. The actuator of this invention has a simple structure and programmable response, making it suitable for soft robots, deformable support structures, and intelligent execution systems.

This invention discloses a modifier for red bed soft rock, its preparation, and its application in improved construction, belonging to the field of road engineering technology. The modifier comprises the following components by weight: 60-100 parts slag, 10-30 parts fly ash, and 1-10 parts alkali activator. This invention targets the characteristics of red bed soft rock, designing a modifier that significantly improves the strength and water stability of the modified red bed soft rock, meeting the requirements of highway subgrade for bearing capacity and deformation resistance. The bonding reaction between the modifier and the red bed soft rock is an irreversible process, maintaining subgrade strength and water stability for a long time and reducing later maintenance costs. The invention also introduces a phase change temperature-controlled curing film method to reduce the impact of temperature fluctuations on the road surface and subgrade, while allowing for self-regulation of humidity and reuse. This invention solves problems such as high treatment costs, significant environmental damage, limited improvement effects, uneven reinforcement, rapid water evaporation during watering curing, uneven curing, and large temperature fluctuations associated with red bed soft soil treatment.

This application provides a method, apparatus, and refrigerator for dynamic scheduling of refrigerator cooling capacity, relating to the field of refrigerator technology. The method includes: acquiring phase change temperature distribution information and historical operating condition information of the compressor in each compartment; determining the cooling capacity mobility in each compartment based on the average temperature and phase change temperature distribution information, and determining the phase change response delay time in each compartment based on the phase change temperature distribution information; determining the system thermal inertia coefficient in each compartment based on the cooling capacity mobility and phase change response delay time; determining the heat load rate in each compartment based on the average temperature and historical operating time of the compressor; determining the target compartment that meets preset forward-looking start-up conditions based on the system thermal inertia coefficient and heat load rate in each compartment, and determining the cooling capacity demand of the target compartment and at least one cooling supply compartment; and allocating the schedulable cooling capacity from each cooling supply compartment to the target compartment, thus solving the problem of precise matching of cooling capacity supply and demand.

This invention relates to the field of functional fabric technology, specifically to a hybrid fiber with phase change temperature control fiber and its preparation method. The raw materials for preparing the hybrid fiber, by weight, consist of 70-80 parts polymer matrix, 13-21 parts phase change material, 3-5 parts polyethylene glycol-b-polyglycidyl methacrylate (PEG-b-GMA), 0.6-1.5 parts KH-580, 0.3-1 parts thermally conductive reinforcing phase, and 0.5-1.2 parts functional auxiliaries; the thermally conductive reinforcing phase is micron-sized boron nitride modified with a silane coupling agent using a wet process. This invention, through the synergistic effect of PEG-b-GMA and the anchoring agent KH-580, can simultaneously solve the problems of poor dispersion, easy leakage of phase change material, and poor mechanical properties in existing blended spinning phase change temperature control fibers. The improved fiber properties can meet the requirements of industrial weaving. This invention uses conventional blended spinning processes, requires no additional specialized equipment, has controllable auxiliary agent costs, is simple to operate, and is easy to implement on existing production lines.

This invention relates to the field of phase change energy storage materials technology, specifically to a high-energy-storage composite phase change material for low-temperature applications and its preparation method. Addressing the problems of high supercooling, slow crystallization rate, and poor heat transfer performance in existing low-temperature phase change materials, this invention uses a glycylglycine aqueous system as the high-energy-storage matrix, introduces organic sugar alcohols as phase change temperature regulators, and constructs heterogeneous nucleation sites by adding inorganic nanoparticles. These nanoparticles significantly reduce the nucleation energy barrier of the system, effectively suppressing supercooling and improving the internal heat transfer efficiency of the material. The material obtained by this invention crystallizes rapidly and releases heat efficiently, making it widely applicable in cold chain logistics and food preservation.

This invention discloses a transient calculation method and system for the temperature field of a phase change capsule based on a thermal network, relating to the field of phase change capsule technology. The method includes: constructing a physical model of the phase change capsule and initializing its parameters; constructing a four-node thermal network model; the phase change process: preheating stage: all heat on the solid surface is used for temperature rise, solving the four-node coupled heat transfer equations, and outputting the transient temperature values ​​of each node; melting stage: the solid surface temperature is fixed at the phase change temperature, solving the equations, calculating the enthalpy of the two-phase mixture based on the net heat flow of the gas and liquid phases, updating the solid and liquid mass and volume, and outputting the transient temperature values ​​of each node; complete liquefaction stage: the solid disappears, the liquid nodes directly exchange heat with the shell wall, calculating the heat transfer coefficient, solving the equations, and outputting the transient temperature values ​​of each node; stage transition smoothing is applied between the preheating and melting stages and between the melting and complete liquefaction stages of each node. This invention significantly improves computational efficiency, provides a complete physical model, and exhibits good numerical stability.

The application belongs to the technical field of refrigerator ice maker control, and relates to a refrigerator control method, a water storage box assembly, a refrigerator, a storage medium and a program product. The method is characterized in that a PCM temperature insulation material with a phase change temperature of 2-5 DEG C is wrapped outside the water storage box, a small circulating pump, an ultrasonic transducer and a low-power heating film are arranged inside, and hierarchical control is performed based on water temperature: when the water temperature is less than or equal to 3 DEG C, the circulating pump is started; when the water temperature is less than or equal to 2 DEG C, the ultrasonic transducer is dynamically started and stopped to destroy ice crystal nuclei; when the water temperature is less than or equal to 1 DEG C and continuously decreases, a PWM-modulated heating film is started to perform compensation heating; and when the water temperature is greater than or equal to 4 DEG C, only the circulating pump is intermittently operated. The application effectively inhibits water body freezing through the synergistic effect of passive heat preservation and active disturbance, and the average power consumption is less than 10 W.

This invention discloses a gel-based composite phase change energy storage material and its preparation method. The material comprises the following components in the indicated mass fractions: 70%–80% phase change matrix; 5%–10% temperature regulator; 1%–3% nucleating agent; 0.5%–1.5% thermal conductivity enhancer; 10%–15% gel skeleton; and 0.5%–2% thickener. This invention precisely controls the phase change temperature to -25°C to -20°C using the temperature regulator, meeting the requirements for frozen product transportation; it utilizes synergistic nucleating agents and functionalized multi-walled carbon nanotubes to control the supercooling to within 2°C; the carbon aerogel skeleton and surface gel protective layer achieve dual leak prevention, exhibiting excellent cycle stability, with a phase change enthalpy decay rate of less than 5% after 500 cycles; simultaneously, the thermal conductivity is significantly improved, and the raw materials are environmentally friendly and biodegradable, showing broad application prospects in the cold chain logistics field.

The embodiment of the present application relates to the technical field of heat pump, and specifically provides a heat pump system, which comprises a compressor, a condenser, a throttling element and an evaporator, the condenser comprises multi-section condenser pipelines, wherein the compressor, the condenser, the throttling element and the evaporator form a working medium loop, and mixed working medium circulates in the working medium loop; wherein the heat pump system further comprises a regenerator, which can communicate with at least part of the multi-section condenser pipelines, so as to heat the low-pressure working medium in the working medium loop by using the working medium flowing through the at least part of the multi-section condenser pipelines. Through such a structure, on the one hand, the drying quality of the heat pump system can be improved in the early stage of drying by means of supplementary heating of the low-pressure working medium by the regenerator. On the other hand, the mixed working medium can improve the phase change temperature of the working medium, and thus can ensure the drying effect in the later stage of drying by means of fully recovering the heat in the air flow.

An apparatus and method for extinguishing a thermal runaway in an electronic component is provided. The apparatus comprises a heatsink affixed to the electronic component, a reservoir containing coolant, and one or more Phase Change Material (PCM) plugs blocking coolant contained in the reservoir, where the PCM plugs, in response to the electronic component being at an approximate temperature of the Phase Change Temperature (PCT) of the PCM plugs, melt, thereby causing coolant to being dispersed onto the electronic component. The method comprises, in response to the electronic component reaching a temperature indicative of a thermal runaway event occurring in the electronic component, melting one or more phase change material (PCM) plugs, wherein the PCM plugs block coolant from draining out of a reservoir. In response to the PCM plugs melting, releasing the coolant from the reservoir onto the electronic component to extinguish the thermal runaway event.

The application relates to a kind of silica-polyurethane composite phase change microcapsules for water-based drilling fluid and a preparation method and application thereof, and belongs to the technical field of oilfield drilling fluid.The application successfully obtains a kind of phase change microcapsule with ternary nitrate / graphene composite phase change material as core material and silica-polyurethane composite material as shell material by sol-gel interface polymerization method.The phase change microcapsule of the application circulates to the bottom of well high-temperature stratum along with drilling fluid, when the temperature of system reaches its phase change temperature, the core material generates phase change endothermic behavior from solid to liquid, avoids the rapid rise of drilling fluid temperature, thereby improving the high-temperature stability of drilling fluid.When drilling fluid circulates into upper low-temperature stratum, microcapsule generates phase change exothermic behavior, realizes multiple cycle temperature control effect.

This invention belongs to the technical field of external warming patch products, and discloses a constant-temperature moxibustion patch formula and its preparation method based on the synergistic temperature control of phase change microcapsules and iron powder oxidation. The constant-temperature moxibustion patch includes a patch body, which, in order of application from the skin side to the outside, comprises an artemisia heat-triggered release layer, a phase change microcapsule temperature control layer, an iron powder oxidation heating layer, and an oxygen-limiting breathable backing layer. The phase change microcapsule temperature control layer contains phase change microcapsules with a phase change temperature of 42-47℃, and the phase change microcapsules exhibit a gradient distribution in the thickness direction, with a higher content near the skin side and a lower content near the iron powder oxidation heating layer. The ratio of the total latent heat of the phase change microcapsules to the theoretical heat release of the iron powder is 0.06-0.18. This invention helps to reduce temperature peaks, prolong the duration of the suitable warming range, and improve the stability of the release of volatile components from artemisia.

This invention belongs to the field of thermal management and energy recovery technology, and discloses a zero-energy thermal management and power supply system for wearable electronic devices. The system sequentially constructs a phase change temperature homogenization layer, a thermoelectric power generation layer, and a radiative heat dissipation layer. The phase change temperature homogenization layer uses a flexible directional thermally conductive phase change material prepared by combining a cellulose-based three-dimensional thermally conductive framework with docosane to achieve chip temperature homogenization and temperature fluctuation smoothing. The thermoelectric power generation layer uses a PDMS substrate combined with a thermoelectric leg array, balancing flexibility and power generation performance. The radiative heat dissipation layer uses a PAL-350A flexible radiative film, achieving zero-energy passive heat dissipation through an 8~13μm atmospheric window. In working mode, the system recovers waste heat from the chip to power the device, and in standby mode, it utilizes residual human body heat to power the device. It can achieve zero-energy heat dissipation under all operating conditions and low-power device self-powering, while also possessing excellent flexibility and compatibility, adapting to the complex curved surfaces and dynamic deformation requirements of wearable devices.

The application discloses a heat dissipation device and electronic equipment, and relates to the technical field of heat dissipation. The heat dissipation device comprises a shell, a heat dissipation piece and a first phase change piece. The shell is provided with a containing groove, and the outer wall surface of the shell is connected with a heat dissipation piece. The heat dissipation piece and the containing groove jointly form a sealed cavity, and the sealed cavity is provided with a phase change heat conduction medium. The first phase change piece is arranged in the sealed cavity, and the first phase change piece is used for absorbing heat of the heat dissipation piece to change phase. The phase change temperature of the first phase change piece is lower than that of the phase change heat conduction medium. In the application, the heat dissipation piece is connected with the heat dissipation piece through the shell, the phase change heat conduction medium in the sealed cavity can absorb heat of the heat dissipation piece and change phase, the heat generated by the heat dissipation piece is transmitted to the heat dissipation piece through the phase change heat conduction medium, the heat transfer performance from the heat dissipation piece to the heat dissipation piece is improved, and therefore, the problem of poor heat transfer effect caused by the heat conduction silicone grease in the related art can be solved, and the technical effect of improving the heat dissipation performance of the heat dissipation piece is achieved.

The application discloses a kind of based on heat network's phase change capsule temperature field transient calculation method and system, it is related to phase change capsule technical field, including: constructing phase change capsule physical model and parameter initialization;Four-node heat network model is constructed;Phase change process: preheating stage: all solid surface heat is used for temperature rise, solve four-node coupled heat transfer equation group, output each node transient temperature value;Melting stage: solid surface temperature is fixed at phase change temperature, solve equation group, according to gas phase, liquid phase net heat flow calculation two-phase mixture enthalpy, update solid-liquid mass and volume and output each node transient temperature value;Complete liquefaction stage: solid disappears, liquid node directly exchanges heat with shell wall, calculate heat transfer coefficient, solve equation group, output each node transient temperature value;To each node preheating stage and melting stage between and each node melting stage and complete liquefaction stage between with stage transition smoothing processing.The application greatly improves calculation efficiency, physical model is complete, and numerical stability is good.

The application relates to the technical field of phase change cold storage material preparation, in particular to a high-performance phase change cold storage material and a preparation method thereof, which comprises the following raw materials in parts by weight: a phase change temperature regulator 15-22 parts, an energy storage agent 0.1-0.5 parts, a heat-conducting agent 10-15 parts, a solvent 65-70 parts and a thickening agent 0.5-1 part; the heat-conducting agent is functional expanded graphite. The phase change cold storage material disclosed by the application has large phase change latent heat, high heat-conducting performance and high cold storage performance.

We offer temperature-regulating textile products with excellent heat retention capabilities, keeping you warm in winter and cool in summer. [Solution] The fabric comprises a surface fabric layer 1 containing phase-change fibers, a filling layer 2 consisting of batting containing phase-change fibers, and a back fabric layer 3 containing phase-change fibers, with these three layers integrally fixed by quilting stitching or adhesive bonding. The unit mass of the surface fabric layer and the back fabric layer is 50 to 400 g / m2, and the unit mass of the filling layer is 50 to 300 g / m2. The phase-change fibers have a phase-change temperature of 15 to 38°C and a heat storage capacity of 20 J / g or more. This provides excellent responsiveness and sustainability of heat absorption and release, and achieves a comfortable feel that is flexible, highly breathable, and less prone to stuffiness.

The application relates to the technical field of functional fibers, and relates to a self-repairing material applied to phase change temperature control and a preparation method thereof.The self-repairing material comprises, from inside to outside, a phase change energy storage layer, a shaping constraint layer, a physical protection layer and a self-repairing shell layer, wherein the phase change energy storage layer is prepared from an amphiphilic phase change material, a surfactant and water, the shaping constraint layer is polyethylene glycol, the physical protection layer is tin quantum dots, and the self-repairing shell layer is collagen nanofiber.The preparation method comprises the following steps: mixing the amphiphilic phase change material, the surfactant and water to form a mixed solution, then shaping and drying the mixed solution to obtain a phase change micellar fiber; and then immersing and drying the phase change micellar fiber in polyethylene glycol solution, tin quantum dot dispersion and collagen nanofiber dispersion in sequence to obtain the self-repairing material.The self-repairing material has high phase change temperature control capability, high mechanical strength, high self-repairing efficiency and excellent stability.

The application provides a spraying material based on crystal phase change cooling and a preparation method thereof, and comprises the following components in mass fractions: core-shell structure particles 10-15 parts, reinforcing agent 1-3 parts, rheological modifier 1 part and sulphoaluminate clinker 100 parts; wherein the core-shell structure particles have the crystal phase change cooling function. The spraying material provided by the application combines the phase change material microcapsules with suitable phase change temperatures and encapsulation stability with the functional coating system for mines, forms an intelligent coating which is firmly attached, has the fire-retardant and antistatic properties and has the sustained heat regulating capacity, and improves the toughness of the spraying material. The preparation method of the spraying material has the characteristics of simple process, low cost and easy popularization and application.

The application discloses a buried flexible composite pipe external binning temperature control wax-proofing and stress regulation method and device, and relates to the technical field of oil and natural gas transportation. The method comprises the following steps: determining a target pipe section, and determining the environmental boundary parameters and the operation boundary parameters of the target pipe section. Then, based on the parameters, the PCM phase change temperature is designed, the PCM phase change layer thickness is calculated, and the PCM phase change latent heat is calculated. Then, according to the calculation results, the selection and structure parameters of the PCM are determined. An outer wrapping PCM composite protective sleeve is installed outside the target pipe section, which comprises an anti-pressure wear-resistant outer protective layer, a PCM sealing cavity layer and a heat conduction enhancement layer. The outer wrapping PCM composite protective sleeve is used to absorb heat in the pipeline operation temperature rising stage and release heat in the temperature dropping or shutdown stage, so that the temperature control wax-proofing and stress regulation are realized. The problems that the existing measures such as external insulation, heat tracing or heating station often have high energy consumption, complex reconstruction, great construction influence and poor engineering implementability are solved.

The application relates to a test base and a solar test device. The test base comprises a base, a phase change module and a heating module. The base is provided with a bearing surface for bearing a to-be-tested piece. The phase change module is thermally coupled with the base. The phase change module comprises a phase change medium configured to adjust the temperature of the base by phase change heat absorption or heat release. The heating module is thermally coupled with the base and used for heating the base. The phase change module and the heating module are combined. When the temperature of the base exceeds the phase change temperature of the phase change medium, the phase change medium absorbs heat. When the temperature of the base is lower than the phase change temperature of the phase change medium, the phase change material releases heat. The test base provided by the application can realize accurate, efficient and energy-saving base temperature control and can realize the test work on the solar cell.

The disclosed technology can be implemented to provide a method of determining thermal conductivity of a sample. The method includes controlling a heat source to raise a temperature of the heat source to an elevated temperature that is higher than a phase transition temperature of a phase change material, placing the sample between and in thermal contact with the phase change material and the heat source below the phase transition temperature to allow thermal conduction through the sample from the heat source to the phase change material, thereby raising an initial temperature of the phase change material to the phase transition temperature to cause the phase change material to transition from a first phase to a second phase, performing a measurement on at least one of the sample or the phase change material, and determining the thermal conductivity of the sample based on the measurement.

The application discloses a kind of preparation method and system of gradient freeze-thaw simulation material, the method is first according to simulation demand to determine target gradient parameter;Then design and prepare by base material, phase change material, heat conduction enhancer and moisture regulator constitute multilayer composite material, by adjusting each layer component to form phase change temperature, heat conduction performance and the controllable gradient of water content in material interior;Finally, the gradient material sample of assembled good cooperates with the preset gradient temperature control program, drives sample to occur non-uniform freeze-thaw.The application overcomes the defect that traditional homogeneous material cannot simulate freeze-thaw gradient effect in nature, realizes the high-precision, high-efficiency reproduction of temperature field, moisture field coupling, simulation error is small (≤±1.5 DEG C), and can be widely applied to frozen soil engineering, slope stability, environmental migration and agricultural freeze damage prevention and other fields of physical model test.

The application discloses a battery thermal runaway response method, system, device, medium and product based on a phase change material, and the method comprises the following steps: monitoring a temperature field distribution of a target battery pack in real time; wherein a phase change material layer with different phase change temperature levels is embedded in a plurality of preset positions of the target battery pack; comparing the temperature of the target battery pack with preset phase change temperature thresholds under each phase change temperature level according to the temperature field distribution; determining a thermal runaway response level in which the target battery pack is currently located according to a comparison result, and triggering the phase change of the phase change material layer corresponding to the thermal runaway response level, so that highly synchronized matching with a thermal runaway dynamic process is realized, and the physical and chemical properties of the phase change material are changed to timely respond to thermal runaways of different levels, and accurate responses to different stages of thermal runaways are also realized.

The application provides an isothermal heating method, a phase change measurement method and a pulsed laser isothermal heating system. The isothermal heating method comprises the following steps: obtaining a target sample; and irradiating a target region on the target sample with a target laser within a preset target time length, so that the temperature of the target region is maintained at a preset temperature within a preset temperature error. Through the isothermal heating method, the accuracy and consistency of experimental results are ensured, so that the corresponding relationship between the phase change temperature and the phase change time can be accurately determined.

This invention discloses a method for determining the suitable phase change temperature of phase change materials for crack prevention in asphalt pavements, relating to the field of road engineering technology. First, a TSRST test is conducted on the target asphalt mixture. The low-temperature cracking characteristic temperature is determined as a threshold based on the inflection point of the temperature-stress curve. Dates with a daily minimum temperature below this threshold are defined as high-risk days for low-temperature cracking. Multi-year meteorological data is collected, and representative values ​​of high-risk day temperatures are determined using statistical methods, and typical representative days are selected. A pavement temperature field model for representative days is established, and the hourly temperature of key control layers is calculated. Based on the hourly temperature distribution, a phase change matching degree evaluation index is constructed, and the suitable phase change temperature is optimized using the maximization of the matching degree as the criterion. This invention achieves precise matching between the phase change temperature and the pavement temperature field, improves the latent heat utilization efficiency of the phase change material, and is suitable for low-temperature crack-resistant design of asphalt pavements in cold regions.