135 results about "Phase change heat transfer" patented technology

The invention belongs to the field of phase change heat storage, and discloses a phase change heat exchange fin parameter optimization method and a related device.According to the method, a three-dimensional parameterized model of a tree-shaped fractal fin containing the length ratio, the width fractal dimension and the fin number is established, representative parameter sample points are efficiently generated through Box-Behnken experimental design, and the representative parameter sample points are optimized; and a liquid phase rate and a total heat storage capacity response value are obtained by combining numerical simulation of phase change heat transfer, and multi-target parameter global optimization is realized based on a second-order polynomial regression model. By the adoption of the method, optimization efficiency and precision are remarkably improved, on the premise that a large number of repeated experiments or simulations are not needed, the optimal fin structure parameters capable of cooperatively strengthening heat conduction, promoting melting of the phase-change materials and maximizing the heat storage capacity are rapidly obtained, and a reliable design basis is provided for engineering application of the fractal fin strengthening phase-change heat storage technology.

The invention relates to the technical field of copper pipe heat dissipation, in particular to a micro-channel heat dissipation device based on a copper pipe structure, which comprises a heat dissipation substrate, a copper pipe type heat dissipation channel and a liquid cooling circulation system, the copper pipe type heat dissipation channel is composed of a plurality of plastic copper pipes and replaces a traditional micro-channel or vapor chamber structure. The copper pipe is embedded or fixed in the heat dissipation substrate or on the surface of the heat dissipation substrate, cooling liquid circulates in the copper pipe, and efficient heat dissipation is achieved through the combined action of forced convection heat exchange and heat transfer; the copper pipe has good plasticity and can be subjected to three-dimensional bending forming according to heat source distribution and spatial layout, through the synergistic effect of forced convection and phase change heat transfer, the heat transfer efficiency is improved, particularly, extremely high local heat flow density can be coped, the chip is effectively prevented from being overheated, and the heat transfer efficiency is improved. The heat dissipation channel can be bent and formed in a three-dimensional space according to heat source distribution, accurate matching with the heat source form is achieved, limitation of traditional plane heat dissipation is broken through, and optimal configuration of heat dissipation capacity and heat flux density is achieved.

The invention belongs to the technical field of aluminum-silicon-based metal materials, and particularly relates to a high-thermal-conductivity composite metal material and a preparation method and application thereof, and the high-thermal-conductivity composite metal material is suitable for heat dissipation requirements of 5G communication equipment, electric vehicle power batteries, spacecraft thermal control systems and the like. A nanocrystalline aluminum alloy matrix is formed by aluminum, magnesium, silicon, scandium and other metal elements, and the problems of anisotropy, obvious thermal response lag, obvious poor cycling stability, boiling critical phenomenon and the like do not exist; meanwhile, the nanocrystalline aluminum alloy matrix comprises a high-density dislocation grid, so that the overall heat transfer efficiency is further improved; in addition, a micro-channel is formed in the nanocrystalline aluminum alloy matrix, liquid metal is poured into the micro-channel to serve as a phase change working medium, and therefore the synergistic effect of active heat transportation and passive heat conduction is achieved. The catalyst layer is used for promoting evaporation-condensation circulation of liquid metal and strengthening phase change heat transfer of a liquid metal working medium; the interface bonding and wettability are enhanced, and the attachment of liquid metal and the channel wall is improved; and phase change working medium oxidation and side reaction are inhibited.

The invention relates to the technical field of cabinet cooling, and particularly discloses a dual-cooling type communication base station cabinet, which comprises a cabinet body, a circulating cooling unit arranged at the top of the cabinet body and a conduction cooling unit arranged at the side part of the cabinet body, active forced exhaust of the circulating cooling unit and passive heat exchange and phase change heat transfer of the conduction cooling unit are combined, so that the dual cooling effect is improved; when the ventilation net plate is blocked due to moisture, and the exhaust efficiency in the air inlet cover is reduced, the trigger piece automatically starts the driving piece, the driving piece is linked with a rotating shaft of the motor, the vibrating piece is driven to vibrate meshes of the ventilation net plate up and down in a reciprocating mode, hardened blocks are promoted to be broken, and meanwhile the friction piece is driven to conduct transverse reciprocating friction on the ventilation net plate. And the trigger part disconnects the driving part until the discharge efficiency is recovered and the temperature is reduced to a normal range, so that the meshes are effectively prevented from being blocked, smooth air inlet is maintained, and the maintenance requirement is reduced.

The invention discloses a temperature difference self-power-generation device utilizing waste heat of a buried steam pipeline and a working method, and belongs to the technical field of heat energy recovery and self power supply. The first heat-conducting plate is arranged on the outer wall of the steam pipeline, the hot-end ceramic substrate, the thermoelectric element, the cold-end ceramic substrate and the second heat-conducting plate are arranged outside the first heat-conducting plate, and the thermoelectric element is connected with the cathode lead and the anode lead. The second heat-conducting plate is connected with a heat pipe, and the upper end of the heat pipe extends out of the ground. Through the design that the annular thermoelectric power generation piece is attached to the outer wall of the steam pipeline, the contact thermal resistance of a heat source and the power generation piece is effectively reduced, it is ensured that the hot end is evenly heated, and the heat energy conversion efficiency is improved; a cold-end heat dissipation structure combining the heat pipes and the heat dissipation fins is adopted, cold-end heat is efficiently transmitted to surface air through the phase change heat transfer characteristic of a working medium, the cold-end temperature is remarkably reduced, the effective temperature difference of the thermoelectric power generation piece is maintained, and therefore the power generation efficiency is stably improved.

This invention relates to the field of micro / nano-structure-enhanced heat transfer surfaces, providing a 3D printing-assisted method and product for fabricating multi-scale three-dimensional metal surface structures. The method includes: fabricating a micron-level high-precision three-dimensional structure mask using 3D printing technology; the three-dimensional structure mask includes a cutout portion and a body portion; the cutout portion matches a three-dimensional structure model; performing material conversion on a metal substrate with the three-dimensional structure mask fixed thereon to obtain a target metal, wherein the metal substrate may be machined beforehand; the target metal surface has a three-dimensional structure matching the three-dimensional structure model. The 3D printing-assisted method for fabricating multi-scale three-dimensional metal surface structures provided by this invention improves the precision of the metal structure by increasing the precision of the template, fabricating multi-scale, multi-material heat transfer structures with micron-level precision and complex structures on the metal surface, thereby improving the metal phase change heat transfer efficiency.

This invention relates to the field of thermal management and sensing monitoring technology, specifically an intelligent sensing system and method for the working fluid state within a pulsating heat pipe based on temperature monitoring. The method involves arranging pipe sections on a pulsating heat pipe, composed of alternating frictional and non-frictional materials. A ring-shaped copper electrode is attached to the outer wall of the frictional material section and connected to an electrometer, while thermocouples are used to measure temperature in the non-frictional material section. As the working fluid flows through the frictional section, it generates solid-liquid (vapor) frictional charge signals, which are transmitted synchronously with the temperature signal to a processing system. Feature extraction and model analysis are then used to perceive the working fluid's flow state and phase change characteristics in real time, thereby achieving intelligent sensing of the working fluid flow and heat transfer characteristics within the pipe. This invention has advantages such as simple structure, high real-time performance, high sensitivity, and non-invasive monitoring, and can be widely applied to the monitoring of the working fluid state and thermal performance analysis and evaluation of pulsating heat pipes and other phase change heat transfer components.

The invention discloses a heat transfer calculation method for pulsating heat pipes with adjustable inclination angles and liquid filling rates. The heat transfer performance of the pulsating heat pipes with different inclination angles and liquid filling rates is researched by adopting a numerical method; calculating the heat transfer process by solving the energy equation of the steam bomb and the energy and momentum equation of the liquid bomb, so as to predict the pulsation phenomenon of the working medium in the pulsating heat pipe; on the basis of a momentum heat mass transfer model, calculating the phase change heat transfer capacity through film condensation and a down-flow film boiling heat transfer coefficient, investigating the influence of different inclination angles on the liquid film thickness and the down-flow film speed, and increasing the influence of the down-flow film on the liquid elastic length; and the liquid bomb pulsation condition of the pulsating heat pipe under different inclination angles and different liquid filling rates is researched, and then the heat transfer performance of the pulsating heat pipe is calculated. The working heat transfer performance of the pulsating heat pipes with different inclination angles and liquid filling rates and the motion state of the working medium are analyzed and calculated, and guidance is provided for parameter development and engineering application of the pulsating heat pipes.

The invention discloses an observation device capable of actively regulating and controlling phase change heat transfer and mass transfer of a thin capillary core, and relates to the field of porous phase change heat transfer. The device is applied to the two-dimensional thin capillary core with the thickness not exceeding 100 microns, the migration characteristic of the phase change interface in the capillary core can be directly observed, the problems that migration of the phase change interface and the surface in the actual capillary core is not consistent, and the phase change interface cannot be directly observed are solved, the evaporation quality in two different liquid supply modes can be measured, and the measurement accuracy is high. Local heat flow of the thin capillary core is controlled through the auxiliary heat source so as to regulate and control migration of the phase change interface; the liquid working medium in the capillary core starts to evaporate after being heated by applying the axial main heat load of the capillary core and the auxiliary heat load at the bottom of the capillary core, and the capillary core is designed into a two-dimensional sheet, so that the humidity degree of the capillary core can be observed through a high-speed camera and the temperature distribution of the capillary core measured by an infrared thermometer is combined; therefore, the migration characteristic of the evaporation interface of the capillary core is directly displayed according to the observed position of the phase-change interface of the capillary core and the change of the temperature field, the phase-change heat and mass transfer rule of the capillary core is researched by combining the evaporation mass and the temperature, and the method has guiding significance for the optimization design of the pore structure of the capillary core.

The utility model relates to heat dissipation copper pipe technical field especially, relates to a heat dissipation copper pipe with composite groove. Its technical scheme includes: copper pipe base pipe and composite groove structure, the copper pipe base pipe inner wall is equipped with the composite groove structure formed by two different tooth shape combinations along the axial direction, the composite groove structure includes the front section main tooth shape area and rear section auxiliary tooth shape area, the front section main tooth shape area is deep straight groove, the rear section auxiliary tooth shape area is shallow straight groove, the front section main tooth shape area with the rear section auxiliary tooth shape area is connected through transition cone surface. The utility model heat dissipation copper pipe sets up deep straight groove in evaporation section to increase capillary pumping force and storage capacity, strengthens phase change heat transfer, sets up shallow straight groove in condensation section to reduce flow resistance and even liquid film thickness, and is connected smoothly two section flow channel through transition cone surface, to be efficient evaporation and efficient condensation in the same pipe body in consideration of, realizes overall circulation resistance reduction and heat transfer performance promotion.

The application relates to a new energy automobile "three-electricity" thermal control system based on a loop heat pipe in the technical field of new energy automobile thermal management, which comprises three-electricity components and a loop heat pipe; the three-electricity components comprise an electric drive, an electric control and a battery pack; the loop heat pipe comprises an evaporator assembly, a main condenser, a secondary condenser, a cold plate assembly, a pipeline system and a stop valve; the cold plate assembly comprises an electric control cold plate group and a battery pack cold plate group. The loop heat pipe in the application forms a self-adapting passive phase change heat transfer two-phase fluid loop in the three-electricity components, does not need to provide additional power consumption by a pump, has better energy-saving effect, only needs to control the temperature of a liquid accumulator, and has simple control logic; the system thermal resistance is small, and the temperature uniformity can be guaranteed to be within 1 DEG C.

This invention discloses a dual-cycle, installation-free, energy-saving air conditioner that recovers waste heat for refrigeration, belonging to the field of air conditioning and refrigeration technology. It incorporates a compression refrigeration system and an adsorption refrigeration system within the casing. A sealed phase-change heat transfer coupler is fitted onto the outer wall of the compressor's high-pressure pipe. The inner sleeve of the coupler, along with the outer sleeve wound around the generator's outer wall, forms a vacuum phase-change loop via a steam riser and a liquid return pipe, transferring compressed waste heat across the system to the generator. A double-layer jacket for condensation heat recovery is fitted onto the outer wall of the second condenser, connected to an auxiliary heating coil via an electronic flow control valve, an intermediate heat exchanger, and a circulating pump. This auxiliary heating coil, alternately wound around the generator with the outer sleeve, forms a dual heat source compensation. The insulation box is divided into a desorption chamber and a cold air chamber. Cold air from the cold air chamber is guided to the compressor and the second condenser for secondary cooling via an electric air valve and a duct. The control unit coordinates and regulates each actuator based on multiple temperature thresholds. This invention achieves dynamic coupling of dual-cycle waste heat recovery and cold source reuse, eliminating the need for an outdoor unit and improving the overall system energy efficiency.

The invention discloses a locally replaceable ICRF antenna limiter and an assembly method thereof, and belongs to the technical field of nuclear fusion engineering and plasma-oriented parts. The limiter comprises a cooling substrate with an internal cooling flow channel and a plurality of limiter units arranged in an array. Each limiter unit is composed of a front end armor, a side edge protection plate, a back supporting plate, a heat pipe assembly and a fastener. The evaporation section of the heat pipe assembly is clamped between the front-end armor and the back supporting plate in an interference fit mode, and the condensation section of the heat pipe assembly is inserted into the insertion opening of the cooling base plate and is sealed through a sealing piece. According to the invention, heat pipe phase change heat transfer is combined with a modular plugging structure, so that a damaged unit can be independently and rapidly replaced under the condition that an overall cooling loop is not influenced. And meanwhile, physical isolation between the high-heat-flow surface and a cooling main loop is achieved through the heat pipe, the heat exchange area is expanded through the condensation section, heat exchange is enhanced through the porous metal layer, and the heat dissipation capacity and operation safety are remarkably improved.

The utility model discloses a phase change cold storage device and laser equipment, and belongs to the technical field of refrigeration equipment, the phase change cold storage device comprises a cold storage device, a refrigeration flow path and a cold taking flow path, the cold storage device is provided with a heat exchange cavity, and comprises a first coil pipe, a second coil pipe, a phase change heat exchange medium and a plurality of fins arranged in an array, and the first coil pipe, the second coil pipe and the phase change heat exchange medium are arranged in the heat exchange cavity. The fins are connected with the first coil pipe and the second coil pipe, and the multiple fins make contact with the phase change heat exchange medium. The outlet end of the refrigeration flow path is communicated with the inlet end of the first coil pipe, the inlet end of the refrigeration flow path is communicated with the outlet end of the first coil pipe, and the refrigeration flow path is configured to introduce a refrigerant into the first coil pipe to provide cooling capacity for the phase-change heat exchange medium; the outlet end of the cooling flow path communicates with the inlet end of the second coil pipe, the inlet end of the cooling flow path communicates with the outlet end of the second coil pipe, and the cooling flow path is configured to introduce cooling liquid into the second coil pipe, absorb the cooling capacity of the phase change heat exchange medium, reduce the size and weight of the phase change cold storage device and meet the field use requirement.

The utility model discloses an efficient heat dissipation insulator with a built-in heat pipe, which comprises an insulator main body, an upper fitting, a heat pipe, a heat dissipation medium and a lower fitting, and is characterized in that the upper fitting and the lower fitting are respectively fixed at the top and the bottom of a shell of the insulator main body; the heat pipe is fixedly connected with the interior of the upper fitting through a process of embedding first and then welding, an axial heat conduction channel from the top to the bottom of the insulator is formed, and the heat dissipation medium is filled in an inner cavity formed between the inner wall of the insulator body and the heat pipe. According to the utility model, the heat pipe is directly integrated in the upper fitting, so that the heat conduction path is obviously shortened, the heat accumulated at the top of the insulator is rapidly conducted to the lower fitting to be released by utilizing the high-efficiency phase change heat transfer characteristic of the heat pipe, and the heat dissipation efficiency is greatly improved while the insulation performance is ensured; the structure is compact, and industrial production is facilitated.

This utility model discloses a heat dissipation auxiliary device adapted to a surface-emitting laser projection device, relating to the field of laser equipment heat dissipation technology. The technical solution includes a laser housing, a heat dissipation shell at the bottom of the laser housing, a heat dissipation component inside the heat dissipation shell, and limiting components on both sides of the heat dissipation shell. The heat dissipation component includes multiple retaining frames, with heat-conducting plates inserted inside the retaining frames, and multiple heat-conducting pipes installed on one side of the heat-conducting plates. This utility model employs a combined liquid cooling and air cooling technology. The heat-conducting pipes rapidly dissipate heat from the heat-conducting plates through phase change heat transfer, while the fan component forces airflow to accelerate heat dissipation. The synergistic effect of these two technologies improves heat dissipation efficiency. The heat dissipation component is detachably connected to the heat dissipation shell via retaining frames and retaining shells. The limiting components enable quick assembly and disassembly of the heat dissipation shell and the laser housing. Maintenance does not require destructive disassembly; simply rotating a knob unlocks the limiting components, shortening maintenance time.

The utility model relates to the field of chip heat dissipation, especially a high performance loop heat pipe heat dissipation device for chip heat dissipation, the evaporator is composed of evaporation end cover, evaporation bottom surface and sintered porous capillary core, the sintered porous capillary core divides the inner chamber of evaporator into the liquid storage cavity of upper part and the evaporation area of lower part, the inner surface of evaporation bottom surface is equipped with micron level micro channel structure, and the sintered porous capillary core is welded on evaporation bottom surface. In the utility model, through the synergistic effect of micro channel structure in the evaporator and sintered porous capillary core, cooperate the double-sided fine capillary condensing structure on the condenser, strengthen the phase change heat transfer process, to realize the heat dissipation performance of extremely low thermal resistance, super high heat flow density and big total heat transfer quantity, the heat dissipation capacity is greatly promoted compared with the existing liquid cooling technology, can satisfy the severe heat dissipation demand of high performance chip, and the system operation is stable and reliable, improves the heat dissipation effect of high heat density chip.

This document discloses a hybrid cooling device, comprising a first coolant, a radiator, a cold plate including a hollow body to receive the first coolant, a closed-loop piping connecting the radiator and the cold plate to circulate the first coolant therebetween, and a main heat sink. The main heat sink is thermally coupled to the outer surface of the cold plate to absorb heat from the cold plate and dissipate it into the ambient air. The hybrid cooling device also includes an auxiliary heat sink, a plurality of heat pipes extending from the cold plate to the auxiliary heat sink, and a second coolant. The second coolant is sealed within each of the plurality of heat pipes to transfer heat from a first end section to a second end section of the heat pipe via phase change heat transfer.

This invention relates to a three-dimensional coupled heat transfer calculation method and system for granular phase change heat accumulators, encompassing the field of phase change heat accumulators. The method includes: constructing a one-dimensional heat transfer model of the interior of each phase change particle in the heat accumulator; obtaining the simulated particle packing morphology using the discrete element method (DEM); analyzing this result to extract the particle ID, 3D coordinates of the sphere's center, and radius parameters; generating particle geometric entities based on the 3D coordinates and radius parameters of each particle's center, and simultaneously generating the tank geometric entity of the heat accumulator, thus obtaining a three-dimensional flow field calculation domain model of the fluid domain; naming each spherical orifice in the three-dimensional flow field calculation domain model according to the particle ID and importing it into CFD software for mesh generation; solving the one-dimensional heat transfer model and the solver independently for each particle, with the solver solving the meshed three-dimensional flow field calculation domain model and the one-dimensional heat transfer model solving the phase change heat transfer process inside the particle, achieving coupling through data exchange on the particle's outer wall surface. This invention significantly improves computational efficiency while effectively ensuring computational accuracy.

The invention discloses a mixed wettability nanowire modified three-stage enhanced boiling heat transfer structure and a preparation method thereof, and belongs to the technical field of micro-nano processing and enhanced phase change heat transfer. According to the structure, two kinds of functional micro-column arrays, namely a micro-cylinder array modified by a super-hydrophilic nanowire and a micro-square column array modified by a super-hydrophobic nanowire, are integrated on a substrate. An efficient liquid supplementing channel is constructed through the strong capillary action, and local dryness is effectively inhibited; the latter is used as a low-superheat-degree nucleation site, rapid generation and separation of bubbles are promoted, bubble coalescence can be effectively inhibited through the millimeter-level spacing, and formation of a steam film is delayed. The two types of micro-columns are orderly distributed in space, and a bubble separation path and a liquid backflow channel are collaboratively optimized. The structure integrates the multi-scale enhanced boiling heat transfer advantages of the millimeter-scale hydrophobic nucleation interval, the micron-scale cylinder and the nano-scale linear structure, the heat transfer coefficient and the critical heat flux are improved, and the structure has important application potential in the high-heat flux heat dissipation fields of high-power electronic devices, aerospace, new energy equipment and the like.

The application discloses an ice slurry composite phase change heat exchange system and a carbon dioxide energy storage system, and relates to the technical field of carbon dioxide energy storage. The heat exchange system comprises a carbon dioxide side circulation unit, an ice making and melting device, a storage unit and a transportation unit. The carbon dioxide side circulation unit is used for constructing a flow path for making carbon dioxide flow through the ice making and melting device to absorb heat and evaporate in the charging process, and constructing a flow path for making carbon dioxide flow through the ice making and melting device to release heat and condense in the discharging process. The ice making and melting device is coupled with the carbon dioxide side circulation unit to perform heat exchange. The ice making and melting device is internally provided with ice slurry medium. The storage unit comprises an ice slurry storage tank and a solution storage tank. The storage unit supplies ice slurry medium to the ice making and melting device or receives ice slurry medium discharged from the ice making and melting device. The transportation unit is used for controlling the transportation of the ice slurry medium between the ice making and melting device and the storage unit. The application can improve heat exchange efficiency, improve flexibility and reduce cost.

This invention provides a mine-use localized fire extinguishing inert gas fire extinguisher, relating to the field of phase change equipment technology for fire extinguishing materials. It includes a housing assembly, a feeding mechanism, an air intake and exhaust assembly, a heat exchange assembly, an external support component, a connecting support component, a drive motor, a material box assembly, and a support base. This invention connects the high-pressure fluid inlet of the ejector to the mine's compressed air system. Utilizing the jet principle, high-speed fluid from the compressed air system is introduced into the ejector. The fluid is mixed and accelerated through the low-pressure fluid inlet of the ejector, introducing air from the mine roadway. Therefore, the gas ejected by the ejector includes air from the mine's compressed air system and air from the mine roadway, serving as a heat source for phase change heat transfer. The gas ejected by the ejector is injected into the interior of the heat exchange tube. Since the heat exchange tube rotates continuously, heat exchange gas is introduced sequentially. After one rotation, the heat exchange tube passes through the ejector's outlet again, injecting new gas. The existing heat-exchanged gas flows out through the exhaust pipe.

This utility model relates to a drying heat recovery device applied in the field of drying technology. It includes a heat exchange component, a condensation component fixedly connected to the lower end of the heat exchange component, and a condensate tank fixedly connected to the lower end of the condensation component. The heat exchange component includes a mounting shell, with an air inlet and an air outlet fixedly connected to the upper end of the mounting shell. The air inlet is located to the left of the air outlet. A partition is fixedly connected to the inner cavity of the mounting shell, dividing the mounting shell into two channels: a cooling channel on the left and a heating channel on the right. By adding a phase change substance inside the heat pipe, the synergistic effect of phase change heat transfer and tube bundle condensation effectively achieves the graded recovery of sensible and latent heat in the drying exhaust gas. This lowers the dew point of the recovered water vapor gas, allowing it to reabsorb moisture from the material and recirculate into the dryer to dry the material. This allows some of the residual heat to be used again in the dryer, further improving the latent heat recovery effect.

The condensation strengthening surface structure is installed on the top or the bottom or the side wall of the phase change heat transfer assembly and comprises a base body and a plurality of condensation islands distributed on the surface of the base body, the wettability of the surfaces of the condensation islands is lower than that of the surface of the base body, so that areas with wettability differences are formed, and the wettability of the condensation islands is higher than that of the surface of the base body. The method is used for promoting condensation liquid drops to preferentially nucleate, gather and quickly separate at a condensation island position. Compared with the prior art, by optimizing the surface wetting characteristic and the liquid drop dynamic behavior at the condensation end, cooperative regulation and control of rapid nucleation, separation and ordered liquid discharge of the condensate are achieved, the liquid film retention effect can be remarkably reduced, and the heat transfer efficiency of the condensation end and the working medium circulation stability are improved. The method has the advantages of remarkable condensation enhancement, high adaptability and the like, and is beneficial to improving the overall heat management performance of a high-heat-flux electronic device and a compact heat dissipation device.

The invention discloses a high-efficiency pollution-free terrestrial heat exploitation method, and relates to the technical field of terrestrial heat exploitation. Comprising the following steps: S1, drilling preparation; s2, wire-line coring drilling operation is carried out; s3, a target stratum is reached, and a drill bit is recycled; s4, selecting and tripping in a gravity assisted heat pipe; and S5, terrestrial heat extraction operation. Terrestrial heat is extracted by means of phase change heat transfer of the gravity assisted heat pipe, underground hot water does not need to be extracted, and the problems of consumption of underground water resources and possible environmental pollution caused by the consumption are avoided; once the gravity assisted heat pipe is tripped into a well and works normally, extra power drive is not needed, heat transfer can be achieved only through natural phase change and circulation of a working medium, and investment cost is basically not needed in the operation process. The gravity assisted heat pipe is of a continuous long pipe structure, threaded connection is not needed, and heat collection operation can be conducted more reliably; the gravity assisted heat pipe is provided with the groove body used for containing and guiding backflow liquid, the backflow liquid can be prevented from affecting the heat collection effect, and more efficient heat collection is achieved.

The invention discloses a method for calculating the total heat loss of geothermal fluid in the flowing process of a geothermal shaft. According to the method, the influence of phase change heat transfer and fouling heat resistance on the total heat loss of the geothermal fluid is considered at the same time. The result shows that the total heat loss is gradually increased along with the shallow depth of the geothermal shaft, and once the geothermal fluid is flashed, the total heat loss is rapidly increased. In addition, according to an energy conservation equation, the total heat loss of the geothermal fluid is mainly divided into three parts which are respectively caused by specific enthalpy, kinetic energy and potential energy. The calculation result can deduce that the specific enthalpy is the main reason causing the total heat loss, and the change trend of the specific enthalpy is basically consistent with the total heat loss. The calculation result is mainly used for revealing main factors causing the total heat loss of the geothermal fluid, the total heat loss of the geothermal fluid is reduced by improving a shaft structure, a geothermal exploitation mode and other measures, and finally the overall utilization efficiency of geothermal energy is improved.

This application discloses a gradually expanding printed circuit board heat exchanger core and heat exchanger adapted to two-phase flow. It includes a cover plate, a bottom plate, a cold side plate layer, and a hot side plate layer. The cold side gradually expanding channel adopts a flow channel structure with progressively increasing width. The cross-sectional area of ​​the flow channel dynamically adapts to the volume change of the gas-liquid phase transition, reducing pressure drop fluctuations and bubble aggregation caused by gas phase expansion. The parallel layout of the diversion channel and the gradually expanding channel, combined with the porous structure of the inner wall, optimizes the uniformity of medium distribution and significantly improves flow stability through graded distribution and enhanced surface wettability. The hot side heat exchange channel incorporates turbulence ribs, which enhance convective heat transfer and phase change heat transfer by disrupting the thermal boundary layer and inducing turbulence. It supports heterogeneous working fluid combinations such as supercritical CO2-water and liquid hydrogen-liquid oxygen. This heat exchanger can improve heat exchange efficiency while reducing pressure drop, balancing compactness, reliability, and wide operating condition adaptability. It achieves optimized two-phase flow and efficient heat exchange, meeting the extreme heat exchange requirements of aerospace, new energy, and other fields.

The invention discloses a super-long gravity heat pipe and a machining method, and relates to the technical field of super-long gravity heat pipe machining. Comprising a continuous pipe, an evaporation section and a condensation section, the length of the continuous pipe is not smaller than 1000 m, and the two ends of the continuous pipe are connected with the evaporation section and the condensation section respectively in an air-tight sealing mode; the interior of the continuous pipe is in a vacuum state and is filled with a working medium matched with the working temperature interval of the continuous pipe. The working medium is one of ethyl alcohol, acetone, water, heat conduction oil and liquid metal. According to the invention, working media such as ethanol, acetone, water, conduction oil or liquid metal are flexibly selected according to working temperature intervals, and a wide range from-50 DEG C to 800 DEG C is covered; flow resistance caused by boiling point differences of working media is remarkably reduced in the internal high-vacuum state, and the phase change heat transfer efficiency is improved; and steel belt precise slitting and laser / high-frequency welding technologies are adopted, so that the wall thickness of the pipe is uniform, the welding seam strength is high, and leakage is avoided.

The invention discloses a finished cement product cooling device, and relates to the technical field of cement cooling, the finished cement product cooling device comprises a shell and a multi-layer cooling module, the top of the shell is provided with a feed port, and the bottom of the shell is provided with a discharge port; the multiple layers of cooling modules are arranged in the shell at intervals in the vertical direction and used for bearing and conveying cement materials step by step. Each layer of cooling module comprises a grid plate, an air cavity and a heat pipe assembly; the air cavity is formed below the grid plate; the heat pipe assembly is based on the phase change heat transfer principle and comprises an evaporation section and a condensation section. Wherein each layer of grid plate is obliquely arranged, and the higher end of each layer of grid plate is alternately connected to the left side wall or the right side wall of the shell and obliquely extends downwards towards the opposite side wall, so that two adjacent layers of grid plates are arranged in a crossed manner, and materials are guided to form a zigzag gliding path; an airflow supply system is further arranged, and the airflow supply system is communicated with all the air cavities and used for supplying airflow to the air cavities. The efficient cement cooling device can achieve efficient cement cooling in a limited space.

The invention provides a flexible two-phase change heat transfer device, which comprises a body covering a chamber, the chamber is provided with a working liquid and a capillary structure body, the body is provided with at least one corrugated section, the corrugated section is provided with a plurality of corrugations, and the capillary structure body is provided with a plurality of capillary structures. The corrugation section at least has a corrugation feature including each corrugation height or each corrugation width or a corrugation pitch between corrugations, and the corrugations do not interfere with each other when the corrugation section of the body is bent at different bending degrees by means of the difference of the corrugation features.