374 results about "Phase change heat transfer" patented technology

The invention relates to a solar medium-high-temperature loop heat pipe steam generator which is composed of a loop heat pipe (1), a straight-through all-glass vacuum pipe (2), a steam pocket (3) and a sealing ring (4). The loop heat pipe (1) is a closed loop formed by an evaporation section (5), a condensation section (6), a first heat insulation section (7(A)) and a second heat insulation section (7(B)), the first heat insulation section (7(A)) is a steam ascending pipe, the second heat insulation section (7(B)) is formed by a condensing liquid descending pipe (12) and a U-shaped liquid storage pipe (13), the straight-through all-glass vacuum pipe (2) and the evaporation section (5) are placed coaxially to form an annular non-vacuum space (20), two ends of the annular non-vacuum space (20) are sealed by adopting sealing rings (4), and the steam pocket (3) is in sealed connection with the condensation section (6) of the loop heat pipe (1). The solar medium-high-temperature loop heat pipe steam generator is suitable for groove-type solar DSG technology, high-efficiency phase change of the heat pipe is utilized for heat transfer to heat water in the steam generator so as to directly generate high-temperature steam, system cost is lowered, and system running reliability is improved.

The invention relates to the research field of boiling phase change heat transfer, in particular to a boiling heat transfer device of an electronic component. The boiling heat transfer device comprises a cooling plate fixed to the surface of the electronic component, a metal foam layer is sintered or welded on the upper surface of the cooling plate, the metal foam layer is provided with square column type microstructures with the width of 50 micron to 200 micron, and the interval between the square column type microstructures is 50 micron to 200 micron.

The invention relates to a three-dimensional network porous heat-conducting heat radiation device and a preparation method thereof. The three-dimensional network porous heat-conducting heat radiationdevice comprises foam metal, high-heat-conduction high-heat-radiation material and a phase-changing heat transferring material, wherein the heat transferring performance is improved by virtue of the phase-changing heat transferring material filling pores inside a foam metal skeleton wire net, the heat radiation performance is improved by virtue of the high-heat-conduction high-heat-radiation material smeared on the surface of the foam metal skeleton, and the three-dimensional network porous heat-conducting heat radiation device is suitable for the electron industry and solves the heat radiation problem of heating elements and devices.

The invention relates to an ultrathin heat homogenizing plate structure. The ultrathin heat homogenizing plate structure comprises an upper shell plate, at least one layer of liquid suction core and a lower shell plate which are sequentially arranged. The lower surface of the upper shell plate is fixedly connected with the upper surface of the uppermost layer of the liquid suction core, and the bottom face of the bottommost layer of the liquid suction core is fixedly connected with the upper surface of the lower shell plate. By using the center of a heat source located on the lower shell plate or the upper shell plate as a center, a plurality of channels which are diffused outwards from the centers and are gradually widened are formed in one layer of the liquid suction core in a ring array mode. The effect of arranging the channels which are diffused outwards and are gradually widened by using the center of the heat source as the center is to provide diffusion paths of working medium steam. A working medium is diffused in all directions along the channels after being evaporated, the purpose of arranging the center of the heat source to be the diffused channel center lies in that the evaporated working medium carries heat of the heat source to be diffused to a whole heat homogenizing plate, the condensed working medium can flow back to the heat source position to be recycled continuously under the capillary force action of the liquid suction cores, and the ultrathin heat homogenizing plate can effectively solve the heat radiating problem of high heating flux electronic components in a narrow space through the principle of phase change heat transfer.

The invention relates to a motor with a rotor cooled. The motor comprises a stator and the rotor, the rotor is fixedly mounted to a motor shaft through a support, and a sealed support cavity is formed between the rotor and the motor shaft through the support. The motor with the rotor cooled is characterized in that the motor shaft is also provided with a cavity, the support cavity is communicated with the motor shaft cavity, and the motor shaft cavity is filled with phase change heat transfer media. According to the motor with the rotor cooled, the rotor and the rotating shaft are combined to form a heat tube structure, heat generated by the rotor during work is smoothly transmitted to a motor end cooler to be dissipated, and the temperature rise of the rotor is lowered greatly.

The invention relates to a complete methanation reaction device for synthesis gas. The device consists of a tube-shell reactor, a heat exchanger, a steam pocket, a make-up water pump, a condenser and a gas-liquid separator, wherein a catalyst is filled in a tube of the reactor; the shell pass is superheated water for removing heat; heat released in methanation reaction is absorbed through the phase change of high-pressure superheated water in the shell pass of the reactor and taken out of the device; the generated steam enters the steam pocket, is subjected to gas-liquid balance and can directly form superheated steam to be supplied to the outside; the temperature of a catalyst bed in the tube of the reactor is regulated and controlled by controlling the balance pressure of the superheated steam; reaction product exit gas exchanges heat with raw material gas and is continuously condensed; and a gaseous product and a liquid product are separated by the gas-liquid separator. The device can realize the continuous and stable operation of the complete methanation reaction of the synthesis gas, can effectively improve heat transfer efficiency and control the temperature of the reaction bed in a phase change heat transfer mode at a high temperature and under high pressure, expands the operation range of the complete methanation reaction of the synthesis gas, and can effectively recycle the heat released in the reaction.

The invention discloses a semiconductor light source mining lamp. The lamp comprises a radiating device and an aluminum substrate, wherein the surface of the aluminum substrate is provided with light emitting diode (LED) chips; the radiating device comprises a phase change heat transfer cylinder which forms a sealed cavity; the sealed cavity is filled with liquid working medium which is subjected to phase change when heated; the outer wall of the phase change heat transfer cylinder is provided with radiating fins; and the phase change heat transfer cylinder is arranged on the surface of the aluminum substrate and is away from the LED chips. In the lamp, a technical means of phase change heat transfer is adopted; and a phase change process of the liquid working medium is utilized to quickly, uninterruptedly and circularly transfer heat, and the heat produced by the LED chips is quickly transferred to a shell of the phase change heat transfer cylinder and the radiating fins, so that the junction temperature of the LED chips can be effectively reduced.

The invention discloses an efficient heat radiation device for a lithium ion power battery. The device comprises a thermal-arrest panel which can tightly fit with the battery, a U-shaped heat pipe filled with a working fluid and a radiating fin group. A bent part in the middle of the U-shaped heat pipe is embedded in the thermal-arrest panel, and overhanging parts at two ends of the U-shaped heat pipe extend out of the thermal-arrest panel. The radiating fin group is tightly secured to the overhanging parts of the U-shaped heat pipe through holes. By the device, efficient heat radiation of the lithium ion battery can be realized, and temperature uniformity between single batteries of a battery pack is raised. Thus, usability of the battery pack is raised, the thermorunaway risk is reduced, and service life of the battery pack is prolonged. A phase-change heat-transfer element heat pipe with high heat transfer coefficient is adopted. The phase-change heat-transfer element heat pip has good heat storage and heat radiation properties and has high operation reliability. Meanwhile, the device provided by the invention has advantages of simple structure and low cost, and is energy-saving and environmentally friendly.

The invention discloses an ice preventing and removing system for an aircraft wing. The system comprises a waste gas treatment device, an air pump, a shell, an evaporator, a condenser, an air line and a liquid line, wherein engine waste gas treated by the waste gas treatment device is introduced into the shell to heat the evaporator, working media are vaporized after being heated in the evaporator and then led out through the air line, and then the working media are cooled into liquid in the condenser located on the skin and give out heat, and finally flow back to the evaporator through the liquid line to finish the whole circulation. According to the system, the vapor-liquid two-phase flow phase change heat transfer design concept is adopted, vapor-liquid phase conversion of the working media is utilized to transmit heat, and then the purpose of preventing and removing ice on the aircraft wing is achieved; engine waste gas of an airplane is utilized as the heat source to increase the comprehensive utilization rate of airplane energy.

The invention relates to a solar high-temperature thermochemical coupling phase-change reactor. The solar high-temperature thermochemical coupling phase-change reactor comprises a CPC (Card Programmed Calculator) secondary optical collector, a quartz glass window, a heat plate, a heat pipe and a cylinder body, wherein a main body is coupled by the heat plate and the heat pipe, the heat plate is positioned at a photothermal conversion side, the heat pipe extending out of the heat plate is positioned at a reaction side, and the heat plate and the heat pipe are communicated into an integer; a heat absorption cavity is formed by the quartz glass window, the heat plate positioned at a heat absorption side and the inner wall of the cylinder body; and a reaction cavity is formed by the heat plate positioned at the reaction side, the heat pipe and the cylinder body. Sunlight is converged and then shines on the heat absorption side of the heat plate, optical energy is converted into heat energy, the heat energy is transferred to an internal working medium through the heat absorption side of the heat plate, the internal working medium transfers heat to the heat plate positioned at the reaction side and the wall surface of the heat pipe through phase-change heat transfer, and a reactant absorbs the heat emitted from the wall surface for chemical reaction. The solar high-temperature thermochemical coupling phase-change reactor can be used for intermediate-high temperature thermal chemical reaction, i.e. the pyrolysis or the reduction of metallic oxides, and the like, prevents the sintering or the damage caused by local overheating of the surface of the heat absorption side, reduces the temperature gradient of the reaction cavity and increase the efficiency and the stability.

The invention provides a movable heat storage and discharge device based on pulsating heat pipes and a heat storage and discharge method thereof. The heat storage and discharge device comprises a shell, a heating chamber, a phase-change material chamber, a cooling chamber and the pulsating heat pipes, wherein the heating chamber, the phase-change material chamber, the cooling chamber and the pulsating heat pipe are all arranged in the shell; the heating chamber, the phase-change material chamber and the cooling chamber are separated by stainless steel partitions; at least one group of pulsating heat pipes pass through the partitions and are arranged in the shell; the parts, which are arranged in the heating chamber and the cooling chamber, of the pulsating heat pipes include straight pipe sections and elbows, and the parts, which are arranged in the phase-change material chamber, of the pulsating heat pipes are straight pipe sections; the parts, which are arranged in the heating chamber, of the pulsating heat pipes are evaporating sections, the parts, which are arranged in the phase-change material chamber, of the pulsating heat pipes are insulation sections, and the parts, which are arranged in the cooling chamber, of the pulsating heat pipes are condensation sections; and fluid inlets and outlets are formed in one end of the cooling chamber and the heating chamber. Phase-change heat transfer of working media in the pulsating heat pipes and phase-change heat storage of phase-change materials are used, so that waste heat is absorbed, stored, transferred and released, thereby effectively recycling the waste heat.

The invention provides a numerical simulation method for solid/liquid phase change in a high-temperature heat storage container in a gravity condition. Numerical calculation is carried out for the complicated problem of phase change heat transfer while natural convection, cavitation and radiation conditions are simultaneously considered, technicians can acquire change of melting rate of solid/liquid phase change materials in the high-temperature heat storage container in a field and distribution of a flow field, a temperature field and liquid phase by the aid of a computer, and accordingly important references for optimizing the design of heat storage containers, suppressing cavitation, improving heat storage efficiency and reducing 'hot spots' and 'hot release'. By the aid of the numerical simulation method, the complicated problem of melting/solidification inside the high-temperature heat storage container in the gravity condition is simply and efficiently solved by the aid of a calculation program based on an enthalpy method, a finite control volume method and SIMPLE algorithm, and the numerical simulation method has important practical values.

The invention relates to a sub-control phase change heat transfer system. The sub-control phase change heat transfer system comprises a heat absorption device and a heat release device which are mutually communicated through a vapor pipe (11) and a condensed fluid pipe (21) so as to form a sub-control phase change heat transfer loop. The sub-control phase change heat transfer system is characterized by comprising an airflow regulating valve (6), an airflow regulating valve controller (8), a liquid flow regulating valve (24) and liquid flow regulating valve controller (25), wherein the airflow regulating valve (6) is arranged in the pipeline of the vapor pipe (11) and the opening of the airflow regulating valve (6) is controllable; and the liquid flow regulating valve (24) is arranged in the pipeline of the condensed fluid pipe (21) and the opening of the liquid flow regulating valve (24) is controllable. The invention also provides a sub-control heat transfer method. In the method, the phase change heat transfer parameters of the heat absorption device and the heat release device are respectively independently controlled.

The invention discloses a supercritical multiphase enhanced heat transfer method and a heat transfer medium. The method is to add an auxiliary phase change heat transfer material to a basic heat transfer medium, so as to ensure that: when no phase change heat transfer is carried out in the working temperature range of the basic heat transfer medium, the auxiliary phase change heat transfer material carries out phase change heat transfer; when the basic heat transfer medium carries out phase change heat transfer, the auxiliary phase change heat transfer material carries out phase change heat transfer at the phase change temperature lower than a basic phase change heat transfer medium. The method and the medium can realize the integral thermal control and thermal management on heat transfer.

The invention discloses a lunar vehicle temperature control system. The lunar vehicle temperature control system comprises a self-circulation fluid circuit, a phase-changing material energy storage device and a solar driving evaporation condensation self-reflux heat exchanging device, wherein the self-circulation fluid circuit comprises a liquid storage tank, a liquid pipeline, a porous core evaporator, a gas pipeline and a capillary pipe temperature control flow valve which is connected to the liquid pipeline; the phase-changing material energy storage device comprises an energy storage box and a phase-changing material which is arranged in the energy storage box, and the porous core evaporator is arranged in the energy storage box; the solar driving evaporation condensation self-reflux heat exchanging device comprises a vacuum pipe and a phase-changing heat conduction medium in the vacuum pipe, the vacuum pipe comprises a heat absorption evaporation area and a heat release condensation area, the heat release condensation area is arranged in the phase-changing material of the energy storage box, and a tree-shaped branch rib structure is arranged in the heat release condensation area. By adopting the temperature control system, the heat balance of a lunar vehicle body is maintained, the high-efficiency transmission of the heat can be realized without power supply, the heat supply safety and long-term running stability of the lunar vehicle can be greatly improved at moonlit night, and a reliable temperature control effect can be provided for the lunar vehicle.

The invention discloses a proton exchange membrane fuel cell based on phase-change heat transfer and a bipolar plate thereof. The bipolar plate of the fuel cell comprises a planar plate, wherein a cathode flow field with a groove structure is arranged on one side surface of the planar plate, an air inlet and a water inlet are arranged on one end of the cathode flow field, an air outlet is arranged on the other end, a water inlet diffusion area is arranged between the water inlet and the cathode flow field, and the water inlet diffusion area is composed of porous substances or polymers embedded in the groove; and an anode flow field with a groove structure is arranged on the other side surface of the planar plate. The bipolar plate has advantages of no cooling channel, small volume and low cost, and adoption of phase-change heat transfer enables heat radiation efficiency to be greatly raised. The proton exchange membrane fuel cell assembled by the bipolar plate does not need a humidifier, a cooling medium storage case, a cooling medium pump and a cooling medium heat exchanger, thereby greatly reducing volume, weight and cost of the system, and reducing a control difficulty.

The invention discloses a composite wick type special-shaped heat pipe radiator. The composite wick type special-shaped heat pipe radiator comprises a base plate, special-shaped heat pipes and radiating fins arranged on the outer sides of the heat pipes. Evaporation cavities are formed in the base plate. Each heat pipe comprises a heat pipe body with the special-shaped section. Grooves are formed in the inner wall of each heat pipe body, and protrusions are formed between the adjacent grooves. A fluffy-shaped fin fiber layer I is laid on the inner wall of each heat pipe body. Each fluffy-shaped fin fiber layer I is made of metal fibers, wherein the surface of each fluffy-shaped fin fiber layer I is provided with irregular protrusions and/or pits and each fluffy-shaped fin fiber layer I is of a fluffy-shaped fin structure. Inner spaces of the heat pipes communicate with the corresponding evaporation cavities, and the inner spaces of the heat pipes and the evaporation cavities form an airtight phase-change heat transfer cavity together. According to the composite wick type special-shaped heat pipe radiator, the fluffy-shaped fin fiber layers are sintered inside the evaporation cavities, the effect that each evaporation cavity is quickly filled with a backflow working medium can be guaranteed, the working media in the evaporation cavities can be evenly distributed, the section shape of each heat pipe is made special, wind resistance caused when airflow passes through the radiating fins and a special-shaped heat pipe bundle of the radiator can be effectively reduced, and the radiating efficiency is improved.

The invention relates to a method for determining the steel belt feeding process parameter of a crystallizer in the thick slab continuous casting process. The method comprises the steps the work condition parameter of the crystallizer in the thick slab continuous casting process is collected, and the feeding quantity of a cold steel belt is determined through the work condition parameter of the crystallizer in the thick slab continuous casting process based on the liquidus congruent melting and phase change heat transfer theory; a continuous casting slab-cold steel belt system phase change heat transfer theoretical model is built through a generalized enthalpy method, namely, a relation model among the melting time and feeding thickness of the cold steel belt, the superheat degree of casting molten steel and the initial temperature of the cold steel belt; the section size and feeding speed of the cold steel belt are determined through the continuous casting slab-cold steel belt system phase change heat transfer theoretical model according to the feeding quantity and melting time of the cold steel belt and the depth of a solidified liquid core; and the cold steel belt with the determined section size and feeding speed is preheated and fed into molten steel in the crystallizer through the position between a water opening and a narrow face of the thick slab crystallizer parallel to the wide face of the crystallizer in a low-amplitude high-vibration manner.

The invention discloses a semiconductor temperature difference power generation system, which comprises phase-change heat transfer structures and temperature difference power generation modules; each phase-change heat transfer structure is composed of an evaporating section and a condensing section, and working medium with high heat absorption capacity and less useful energy loss within a temperature range, which is chosen according to the optimal working temperature of thermoelectric material, is filled in the pipeline of the evaporating section; the phase-change heat transfer structures comprise a high-temperature phase-change heat transfer structure, a medium-temperature phase-change heat transfer structure and a low-temperature phase-change heat transfer structure; the thermoelectric materials with different optimal working temperatures, which correspond to the evaporating sections, are also chosen by the temperature difference power generation modules; thermoelectric material hot ends cling to the surfaces of the condensing sections, and thermoelectric material cold ends cling to the wall surfaces of cooling passages. The invention broadens the useable range of the phase-change heat transfer structures in the whole process of heat transfer, reduces the temperature difference between a heat source and a generator, and increases the energy utilization rate of the system, and the semiconductor temperature difference power generation system is mainly used for supplying electric energy to an automobile power system.

The invention relates to a plate type heat pipe with separation channels. According to the plate type heat pipe, one or more sets of separation channels are arranged in a plate type base body, one set of separation channels is composed of at least one evaporation channel and at least one condensation channel, the evaporation channels and the condensation channels are separated by reinforcing ribs, and capillary narrow clearances are formed in the reinforcing ribs. Working media with the phase-change heat transfer function are poured into the channels, and efficient heat transfer of the heat pipe is achieved. According to the plate type heat pipe, interface friction shear force of a vapor phase and a liquid phase in the work process of the heat pipe can be greatly reduced, and the novel plate type heat pipe has the obvious advantages of being low in heat resistance, high in heat exchange capacity, high in heat exchange efficiency, large in inclination range and the like, and is light, simple in structure, high in loading capacity, simple in manufacturing process, efficient, practical and low in cost.

The present invention provides a heat transfer device without phase transition and a manufacturing method thereof. The heat transfer device transfers heat without phase transition circularly, namely performs heat transfer without phase transition. Therefore, the heat transfer device which operates under a required working condition is provided. The heat transfer device is provided with a sealed member which limits a chamber body, and working medium which is accommodated in the chamber body, wherein the working medium is filled in the chamber body based on a temperature and a pressure under the required working condition. The invention also provides a manufacturing method thereof.

The invention relates to a distributed control phase-change heat transfer system based on graded heat exchange and a heat transfer method. The system comprises a cold source heat exchanger, a heat source heat exchanger, a vapor-liquid heat exchanger and a liquid storage tank. An upper collecting tank of the cold source heat exchanger is communicated with the vapor-liquid heat exchanger through a vapor outlet pipe of the vapor-liquid heat exchanger. A lower collecting tank of the cold source heat exchanger and a lower portion liquid side of the liquid storage tank are respectively communicated with the vapor-liquid heat exchanger through condensation fluid pipes. An upper portion vapor side of the liquid storage tank is communicated with the upper collecting tank of the cold source heat exchanger. The heat source heat exchanger comprises a low-temperature heat source heat exchanger and a high-temperature heat source heat exchanger which are arranged in series. Vapor side communication pipes on the low-temperature heat source heat exchanger and the high-temperature heat source heat exchanger are combined into a vapor pipe to be communicated with a vapor side vapor inlet of the vapor-liquid heat exchanger. A liquid side outlet of the vapor-liquid heat exchanger is communicated with an upper collecting tank of the high-temperature heat source heat exchanger through a liquid outlet pipe of the vapor-liquid heat exchanger. The liquid side outlet of the vapor-liquid heat exchanger passes through the high-temperature heat source heat exchanger and the low-temperature heat source heat exchanger, and then is communicated with an upper portion liquid side of the liquid storage tank through an overflow pipe. The distributed control phase-change heat transfer system is better in effect.