264 results about "Phase change heat transfer" patented technology

Disclosed in the present invention is a heat dissipation structure integrating a heat dissipation plate and a phase change heat transfer device, comprising a heat dissipation plate and a vapor chamber. The heat dissipation plate is provided with a flow channel allowing for flowing of a dielectric material, an inlet allowing for flowing of the dielectric material into the flow channel, and an outlet allowing for flowing of the dielectric material from the flow channel. In addition, the upper end surface of the heat dissipation plate is further provided with an opening, and the vapor chamber is blocked on the opening in the upper end surface of the heat dissipation plate to directly perform contact heat transfer with the dielectric material in the heat dissipation plate. The present invention can efficiently solve the problem of insufficient heat exchange efficiency between the vapor chamber and a cooling medium material during composite heat dissipation of the vapor chamber and the heat dissipation plate, and effectively improve the cooling efficiency of the composite heat dissipation mode of the vapor chamber and the heat dissipation plate. Since the vapor chamber has high structural requirements, there is no need to make significant modifications to components, and in the present application, there is no need to change the internal structure of the vapor chamber, thereby making the production and processing easier to implement.

The gradually-expanded printed circuit board type heat exchange inner core comprises a cover plate, a bottom plate, a cold side plate layer and a hot side plate layer, a cold side gradually-expanded channel is of a flow channel structure with the width gradually expanded, and the sectional area of a flow channel dynamically adapts to gas-liquid phase change and volume change. And pressure drop fluctuation and bubble aggregation caused by gas phase expansion are reduced, the shunt channels and the divergent channels are arranged in parallel, an inner wall porous structure is combined, medium distribution uniformity is optimized through graded distribution and surface wettability enhancement, and the flow stability is remarkably improved. The turbulent flow ribs are arranged in the heat exchange channel on the heat side, combination of heterogeneous working media such as supercritical CO2-water and liquid hydrogen-liquid oxygen is supported by destroying a heat boundary layer, inducing turbulent flow and strengthening convective heat exchange and phase change heat transfer, the heat exchanger can improve the heat exchange efficiency while reducing pressure drop, compactness, reliability and wide working condition adaptability are considered, and the heat exchange efficiency is improved. Two-phase flow optimization and efficient heat exchange are achieved, and the extreme heat exchange requirements in the fields of aerospace, new energy and the like are met.

The invention belongs to the technical field of ocean engineering and water electrolysis hydrogen production. In order to solve the problems that a traditional water cooling system is large in size and low in heat dissipation efficiency, a multi-scale thermal sensing network is deployed to collect data; establishing a multi-phase-change cross-scale heat transfer model; constructing a two-stage gradient composite cooling module; constructing and optimizing a cooling decision algorithm; designing a cooperative control loop; deep reinforcement learning control is implemented; creating a functional surface; and constructing a dynamic optimization system. The characteristics of part of the steps are limited, efficient heat management can be achieved, and stable operation of the floating type offshore hydrogen production platform cooling system is guaranteed.

The invention discloses a joint heat dissipation structure and a robot in the technical field of robots. The joint heat dissipation structure comprises a joint, the joint is provided with a shell, a containing cavity is formed in the inner side of the shell, a motor is fixedly arranged in the containing cavity, the joint heat dissipation structure is further provided with a heat dissipation assembly used for reducing the temperature in the containing cavity, the heat dissipation assembly is a pulsating heat pipe, and the pulsating heat pipe comprises an evaporation section and a condensation section. The evaporation section is attached to the outer wall of the motor, and the condensation section is attached to the inner wall of the shell. The pulsating heat pipe is used for heat dissipation, based on the phase change heat transfer principle, no extra fan or pump is needed, self-oscillation flowing is achieved completely through thermal driving, and the overall energy consumption of the robot is remarkably reduced. The pulsating heat pipe is small in occupied space, light in weight, simple in structure, low in maintenance cost and suitable for long-term operation, and joint movement flexibility and load capacity are effectively improved; the condensation section is attached to the inner wall of the shell, the joint shell can be heated while heat dissipation is conducted, and the warm touch feeling can be provided without extra energy consumption.

The invention discloses a graphite electrode cooling device of a graphitization furnace, the graphitization furnace and a cooling method, and relates to the technical field of graphite electrode cooling, the graphite electrode cooling device of the graphitization furnace comprises a cooling mechanism, the cooling mechanism comprises an adhesion layer and a plate type heat pipe, an adhesion layer is arranged on the surface of the graphite electrode exposed outside the graphitization furnace, the plate type heat pipe is arranged on one side, far away from the surface of the graphite electrode, of the adhesion layer, the plate type heat pipe comprises a sealing shell, a medium cavity is formed in the sealing shell, a capillary core layer is arranged on the inner wall of the medium cavity, and a cooling medium is stored in the medium cavity; according to the graphite electrode cooling device of the graphitization furnace, the plate type heat pipe is attached to the surface of the exposed graphite electrode, circulating water cooling is not needed, phase change heat transfer of a cooling medium is utilized, the heat dissipation efficiency is improved, phase change heat transfer is not conducted under the low-temperature condition, and invalid heat exchange is avoided.

The invention relates to a high-power water-cooling permanent magnet synchronous motor for engineering machinery, in particular to a high-efficiency heat dissipation motor system adopting a double-heat-pipe coupling cooling structure, which is characterized in that array flat heat pipes and high-speed working condition self-backflow rotating heat pipes are respectively integrated in a stator and a rotor, so that stator-rotor double-channel, phase-change and rapid heat conduction is realized; and the thermal control capability and reliability of the motor are improved. According to the motor, a plurality of ultrathin flat heat pipes are symmetrically arranged on the outer circle of a stator and are in one-to-one correspondence with winding notches, so that a rapid and efficient stator heat conduction path is formed; and meanwhile, the hollow rotating shaft made of sintered copper powder is designed into a rotating heat pipe structure, so that the heat of the rotor can be quickly transferred to the water-cooling casing through a bearing area, and the efficient cooling of the rotor assembly is realized. The double-heat-pipe structure constructs a stator and rotor independent heat dissipation channel through a phase change heat transfer mechanism, motor size constraint is not changed, temperature rise of windings and permanent magnets is remarkably reduced, heat balance and system stability are improved, and the double-heat-pipe structure is particularly suitable for high-load working conditions such as engineering machinery.

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 phase change heat transfer, and particularly discloses a multi-field coupling enhanced phase change heat transfer visualization experiment research device which comprises a vacuum cavity provided with a heat exchange block mounting hole, an auxiliary cooling device mounting hole, first to fifth thermocouple mounting holes, a wire mounting hole, an electric field, a magnetic field mounting position and an electromagnetic wave incident port. The heat exchange block is mounted in the heat preservation sleeve; the auxiliary cooling device is mounted in the auxiliary cooling device mounting hole; a heating rod mounting hole is formed in the bottom of the end cover; the heating rod is mounted in the heating rod mounting hole; the heat preservation sleeve is installed in the heat exchange block installation hole and provided with an ultrasonic oscillation generating device installation position. The electric field-magnetic field generating device is provided with an electric field generating device and a magnetic field generating device. The influence of the superheat degree and the supercooling degree on enhanced thin liquid film boiling heat transfer and enhanced condensation heat transfer can be researched by changing the heating rod and the heat exchange fluid flow.

The invention discloses an immersion phase change cooling device and cooling method for a net-forming type energy storage converter. The device comprises a power module phase change cooling unit, a condensation module, a liquid storage tank and a heat exchanger, the power module heating element is soaked in a refrigerant of the power module phase change cooling unit, the refrigerant absorbs heat and is heated to generate phase change vaporization, and a liquid refrigerant is converted into a gas refrigerant to be used for reducing the temperature of the power module heating element. A gaseous refrigerant flows to a condensation module, the condensation module exchanges heat with the gaseous refrigerant, so that the gaseous refrigerant is converted into a liquid refrigerant through phase change, and the liquid refrigerant flows to a heat exchanger and exchanges heat with air in the cabinet to reduce the temperature of elements in the cabinet; and the liquid refrigerant continues to flow into the power module phase change cooling unit to cool the power module, so that the immersion phase change cooling circulation process of the structure network type energy storage converter is realized. According to the invention, through phase-change heat exchange, the heat dissipation problem of sudden increase of heat consumption caused by short-time multi-time overload of the grid-forming type energy storage converter is solved, and the heat dissipation efficiency and reliability are improved.

The invention relates to the technical field of liquid nitrogen jet precooling, in particular to a low-temperature cold air generating device and a liquid nitrogen jet system.The low-temperature cold air generating device comprises a shell, and a plugging cone is arranged in the shell; an annular cavity is formed between the plugging cone and the inner wall of the shell, and a plurality of flow equalizing plates are arranged in the annular cavity; a liquid collecting ring is arranged on the shell in the circumferential direction, and the liquid collecting ring is connected with a liquid nitrogen source; and a plurality of jet holes are formed in the shell corresponding to the liquid collecting ring. The low-temperature cold air generating device is arranged to be in a side spraying mode of the annular wall face, so that in the whole low-temperature cold air generating process, liquid nitrogen does not make direct or indirect contact with air before entering the device; the problems of insufficient utilization of latent heat, poor two-phase flow stability of liquid nitrogen in the pipe and large structural local stress caused by heat exchange between the liquid nitrogen and air before spraying of the spraying holes are effectively solved, meanwhile, the device can meet the requirement of a scene with the high requirement for miniaturization of the device, and the application range is wide. The problems that an existing low-temperature cold air generating device is poor in phase change heat transfer and mass transfer uniformity and low in heat exchange efficiency are solved.

The present invention relates to a Tesla valve-type ultra-thin planar thermal diode based on phase change heat transfer technology. The diode comprises a tube body, within which are disposed an evaporation end, a liquid working fluid cavity, a Tesla valve flow channel, a liquid wick filled with liquid working fluid, and a condensation end. The wick is disposed within the liquid working fluid cavity. The condensation end, the wick, and the evaporation end are sequentially connected to form a liquid working fluid path, while the evaporation end, the Tesla valve flow channel, and the condensation end are sequentially connected to form a gaseous working fluid path. The Tesla valve utilizes the fluid acceleration characteristics and unidirectional conductivity of the fluid to improve the unidirectional thermal conductivity of the ultra-thin planar thermal diode. During forward heating, the gaseous working fluid flows from the evaporation end to the condensation end, flowing downstream within the Tesla valve with low air resistance and high thermal conductivity. During reverse heating, the gaseous working fluid flows from the condensation end to the evaporation end, flowing countercurrently within the Tesla valve with high air resistance and low thermal conductivity, thereby achieving the effect of a thermal diode. The diode can be widely used in the microelectronics industry.

The invention discloses a subtractive etching micro-nano multistage rough structure copper surface for strengthening boiling heat transfer and a preparation method thereof, and relates to the technical field of micro-nano composite structure strengthening phase change heat transfer. The etched micro-nano multistage coarse structure completely covers the surface of the copper substrate, the micro-nano multistage coarse structure comprises micron-scale concave cavities, nano-scale concave cavities / holes and nano-scale granular bulges, and the micron-scale concave cavities, the nano-scale concave cavities / holes and the nano-scale granular bulges jointly form a multistage structure; performing ultrasonic cleaning on the target metal substrate by using a cleaning solution; and a mixed aqueous solution of ammonium persulfate and chlorate is used as an etching solution, and the cleaned target metal substrate is left to stand in the etching solution for etching. And after the etching is finished, cleaning to obtain the etched micro-nano composite rough structure surface. Ammonium persulfate and chlorate are used as solutes, and the mass ratio of the solutes to the solvent is 1: 3. The mass ratio of the ammonium persulfate to the chlorate in the solute is (1: 9)-(3: 7). The method has high production efficiency, shows good thermal stability in a boiling test, and is beneficial to industrial large-scale application and production.

The invention discloses a flue gas waste heat utilization system based on a vacuum heat pipe technology and an optimized operation method thereof, and the system combines supercritical water gasification, synthesis gas combustion power generation and vacuum heat pipe waste heat recovery to form an efficient integrated energy conversion system. The system core comprises a supercritical water gasification reactor, a combustor, a supercritical turbine and a waste heat recovery network composed of high-temperature, medium-temperature and low-temperature vacuum heat pipes, and is coupled with an organic Rankine cycle to achieve deep utilization of low-grade heat energy. The vacuum heat pipe is of a sectional type structural design, thorough isolation of the smoke side and the water side is achieved, rapid heat transfer is completed under the small temperature difference based on self-circulation formed by phase change heat transfer of an internal medium and capillary force driving, and gradient utilization of smoke waste heat is achieved. Through optimal matching of the vacuum heat pipe network and the supercritical water gasification power generation system, the technical problems that a traditional waste heat recovery device is low in heat exchange efficiency and prone to ash deposition corrosion are solved, and the comprehensive energy efficiency of the system is improved.

The invention relates to the technical field of new energy automobile heat management, in particular to an R290 integrated secondary loop energy efficiency improving heat management system for an electric automobile, which comprises a refrigerant side loop and a water side loop, the refrigerant side loop is filled with an R290 refrigerant and used for achieving refrigerant circulation phase-change heat exchange. The water side loop comprises a passenger compartment water loop, a battery water loop and a motor water loop; the passenger compartment water loop is filled with a coolant and is used for exchanging heat with a passenger compartment and adjusting the temperature of the passenger compartment; the battery water loop is filled with a coolant and is used for carrying out heat management on the battery and realizing absorption and transfer of battery heat; the motor water loop is filled with a coolant and is used for cooling the motor and maintaining the working temperature of the motor; the coolant in the water side loop and the R290 refrigerant in the refrigerant side loop are located in different pipelines.

The invention belongs to the technical field of 3C product manufacturing, and discloses a phase change heat transfer middle frame and a manufacturing method thereof.The phase change heat transfer middle frame comprises a middle frame body, and a plurality of through holes are formed in the surface of the middle frame body; the phase change heat transfer part is installed on the inner wall of the middle frame, and the phase change heat transfer part is used for conducting uniform heat dissipation on the interior of the middle frame; the phase change heat transfer component comprises two adaptive frames and a phase change heat transfer mechanism located in the centers of the two adaptive frames. The phase change heat transfer mechanism comprises a pipeline, and a mounting assembly, an evaporator, a liquid storage device and a condenser which are respectively mounted on the pipeline, through the cooperation of the middle frame, the pipeline, a capillary structure and other structures, rapid and uniform heat dissipation is realized, and the problems that an existing device is difficult to conduct heat to a screen through a hinge, and the heat dissipation effect is poor are solved. Although the heating element has basic heat conduction capability, the heating element is limited by the characteristic of poor temperature uniformity, and heat is easy to accumulate at the corresponding position of the heating element.

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 relates to the technical field of electronic component heat dissipation, and discloses a micro-fluidic regulation liquid drop overheating surface heat dissipation device based on intelligent monitoring, which comprises an electrode plate body, an electrowetting surface is arranged above the electrode plate body, a plurality of liquid drops are arranged on the electrowetting surface, and the electrode plate body is connected with an external control circuit module. The liquid drops and the electrode plate body form a conductive path; the control system comprises a control module and a temperature acquisition module, the temperature acquisition module is used for acquiring the environmental space temperature, the control module is connected with the external control circuit module, and when the acquired temperature exceeds a set temperature threshold value, the control module controls the electrode plate body to form an electric field gradient through the external control circuit module, so that the liquid drops move towards an overheated point, and the liquid drops are heated. And the liquid drops absorb heat through evaporation. The liquid drop migration speed is remarkably increased, the system adopts a phase change heat transfer mechanism, evaporation or boiling replaces sensible heat transfer, and the unit area heat dissipation efficiency is remarkably improved compared with a traditional scheme.

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 an intelligent temperature control vacuum cup based on a phase change material and a preparation method thereof, the intelligent temperature control vacuum cup comprises a cup body, the cup body is composed of an inner container and a stainless steel shell, and a heat transfer layer is arranged between the inner container and the stainless steel shell; the phase change heat transfer assembly is arranged in the heat transfer layer and used for heat transfer between the inner container and the stainless steel shell; the heat transfer control assembly, the temperature display heat preservation assembly and the control assembly are arranged below the inner container, and the heat transfer control assembly and the temperature display heat preservation assembly achieve temperature monitoring, temperature display and phase change heat transfer under regulation and control of the control assembly. In actual use, through the phase change heat transfer assembly and the heat transfer control assembly, the problems that a vacuum cup in the current market mainly relies on a vacuum heat insulation layer to slow down heat loss, the temperature control mode is single and passive, and the heat conduction efficiency cannot be dynamically adjusted according to the liquid temperature are solved; a user does not need to manually open a cover for heat dissipation or help external cold water for auxiliary cooling, operation is easy, and the scalding risk is avoided.

The present invention relates to the field of new energy, and discloses a regional multi-energy complementary zero-carbon energy supply system that couples reversible solid oxide cell technology with a closed CO2 network, including RSOC thermal-mass-electricity reversible conversion, a closed CO2 circulation network, renewable energy power, an external heat source, chemical energy storage, natural cold and heat sources, and end-use energy modules. In the present invention, the RSOC operates bidirectionally in the power generation and electrolysis modes, and couples with the chemical energy storage module to achieve regional multi-time-scale energy balance. Photovoltaic power generation supplies power to both the RSOC electrolysis and end users simultaneously. In the external heat source module, concentrating solar heat collection and industrial waste heat can be integrated with the RSOC module to reduce the electrolysis power consumption. The closed CO2 network uses pressurized low-temperature CO2 as the circulating working fluid for the regional heating and cooling network. It can fully utilize the waste heat of the RSOC and natural cold and heat resources on the source side; at the end, it greatly improves the heating and cooling capacity of the network through phase change heat transfer to achieve passive cooling of users, and at the same time couples with a water source heat pump to meet different-grade heating demands, with net zero carbon emissions throughout the process.

The present invention provides an enhanced heat dissipation structure of and a heat dissipation method for a high-power heating device. The enhanced heat dissipation structure of a high-power heating device comprises a high-power heating device; the upper surface of the high-power heating device is provided with a phase change heat transfer device; the phase change heat transfer device is filled with a phase change working medium; an evaporation end of the phase change heat transfer device is in contact with the high-power heating device; a condensation end of the phase change heat transfer device is far away from the high-power heating device; and a contact surface of the high-power heating device and the phase change heat transfer device is provided with a heat conduction interface material. Heat of the high-power heating device can be transferred to the phase change heat transfer device by means of the heat conduction interface material, and then vapor-liquid phase change heat transfer is carried out in the phase change heat transfer device to achieve efficient diffusion of heat, thus increasing the equivalent heat dissipation area of the high-power heating device, and ensuring effective heat dissipation of the high-power heating device.

The invention provides a small-size light-weight high-power chip microstructure air cooling radiator, and belongs to the technical field of radiators. The present invention comprises: a substrate; the cavity is provided with a liquid working medium with latent heat of vaporization and is arranged on the substrate; the microstructure is arranged on the bottom surface in the cavity; the fins are provided with inner-section fins, middle-section fins and outer-section fins which are arranged on the periphery of the cavity in a crossed manner; and the fan is arranged above the fins. High-strength evaporation and boiling of the microstructure are utilized to strengthen coupling of a phase change heat transfer process and a heat conduction heat transfer process of each section of fins, the heating amount of a high-power chip is shared, the optimal height from a fan to the fins of the radiator is determined by utilizing a fin cross arrangement mode among the sections of fins and by means of the height of a distance cap, and the heat dissipation efficiency is improved. The forced convection heat transfer coefficient between the surfaces of the fins and the air is further improved, the heat transfer resistance of the high-power air-cooled radiator is remarkably reduced, the heat dissipation performance is improved, the weight of the high-power air-cooled radiator is reduced, and the size of the air-cooled radiator 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.

The invention relates to the technical field of power module packaging, in particular to a power module insulation-heat dissipation packaging structure based on gas-liquid phase change mass transfer. In order to solve the problem that the existing material cannot balance the requirements of heat dissipation and insulation, the invention provides the following technical scheme: the heat dissipation structure comprises two groups of semiconductor chips to be packaged, two groups of insulated vapor chamber substrates are arranged below the semiconductor chips, and the two groups of insulated vapor chamber substrates are correspondingly arranged; the insulating vapor chamber substrate comprises an upper-layer copper plate for welding a semiconductor chip, an upper-layer copper liquid absorption core is arranged below the upper-layer copper plate, a plurality of groups of ceramic liquid absorption cores are arranged in an array of the upper-layer copper liquid absorption core, and lower-layer copper liquid absorption cores are connected below the ceramic liquid absorption cores; the packaging structure combines phase change heat transfer and insulation transformation of the vapor chamber, has good insulativity and efficient heat transfer capability, rapidly exports and uniformly distributes high heat, adapts to high-power density and miniaturized heat dissipation and insulation requirements, and improves long-term reliability.

The invention belongs to the technical field of data center energy saving, and discloses a data center intelligent cooling PUE optimization system which comprises a wet bulb variable flow cooling module, a critical phase change water cooling module, a free cooling AHU air conditioning box module, a heat exchanger module for providing energy through liquid cooling and an I T machine room PUE evaluation module. On the basis that the original indoor layout is not changed, the automatic critical phase change water cooling system replaces traditional air cooling, the heat dissipation efficiency is improved through phase change heat transfer, the unit failure rate is reduced by over 60%, and stable operation of the data center is guaranteed. Meanwhile, a free cold control method is introduced, mechanical refrigeration dependence is reduced by means of a natural cold source, cooling energy consumption is reduced by 30%-40%, and energy conservation and cost reduction are achieved; in addition, the PUE monitoring, tracking and evaluating system cooperates with all the modules, energy consumption is monitored in real time, accurate regulation and control are achieved, the system adapts to environment and load changes, the data center is promoted to develop towards the intelligent and green direction, and reliability and economical efficiency are both achieved.

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.