481 results about "Subcooling" patented technology

The invention provides a thermal behavior experiment system and method under a narrow rectangular channel reflooding cooling condition. The system comprises a heating water storage tank, a nitrogen tank, a steam tank, a shield pump, a preheating section, a first direct-current power supply, a second direct-current power supply, a narrow rectangular channel test section, a steam-water separator, a surge tank, a flow control valve, a silencer and an electromagnetic valve. The experimental working medium is deionized water, and re-submerging cooling experiments under different system pressures, working medium supercooling degrees, heating wall surface heat flux densities, working medium submerging speeds, heating wall surface initial temperatures and channel interior initial liquid levels can be carried out on an experimental section of a narrow rectangular channel structure. The device is suitable for narrow rectangular channel structures with different sizes, and can be used for carrying out re-submerging experiments on experiment sections with single-plate double-channel, double-plate three-channel and more channels. The system pressure and the inlet flow in the submerging process can be kept stable, and it can be ensured that the supercooling degree of a working medium, the heating wall surface temperature and the initial liquid level are controllable.

An improved heat pump including an integrated system for the management of refrigerant charge is provided. The integrated system actively adjusts charge allocation and thereby optimizes operational efficiencies in all modes of operation. In one embodiment, the integrated system includes three four-way valves, two expansion valves, two one-way check valves, and a suction line accumulator to optimize charge allocation. The four-way valves dictate the mode switch and refrigerant flow directions, and the expansion valves automatically allocate refrigerant mass in active components and store excess charge in an idle heat exchanger and suction line accumulator by controlling the compressor discharge pressure (equivalent to controlling condenser subcooling degree) as a function of the entering air and water temperatures. The integrated system provides seven working modes and is uniquely suited for spacing cooling, spacing heating, and water heating in both residential and commercial applications.

The embodiment of the invention provides a refrigerator performance prediction method and device, electronic equipment and a storage medium, and belongs to the technical field of refrigerators. The method comprises the steps that operation state parameters of a refrigerating machine unit are obtained, the refrigerating machine unit comprises a refrigerant system, the refrigerant system comprises an evaporator, a condenser and a compressor, and the operation state parameters comprise the first saturation temperature and the steam superheat degree of the evaporator, the second saturation temperature and the liquid supercooling degree of the condenser and the exhaust temperature of the compressor; calculating a first energy efficiency coefficient of the refrigerant system according to the first saturation temperature, the steam superheat degree, the second saturation temperature, the liquid supercooling degree and the exhaust temperature; obtaining rolling bearing transmission efficiency and motor efficiency of the refrigerator unit; and calculating a second energy efficiency coefficient of the refrigerator unit according to the rolling bearing transmission efficiency, the motor efficiency and the first energy efficiency coefficient. According to the embodiment, the accuracy of refrigerator performance prediction can be improved.

The invention relates to an aluminum alloy strengthening method for high-frequency pulse nanosecond laser surface remelting after low-temperature rolling, which comprises the following steps: firstly, carrying out low-temperature rolling deformation treatment on an aluminum alloy plate to obtain an aluminum alloy material with a high dislocation density fiber structure and realize deformation strengthening; afterwards, the surface of the aluminum alloy plate is subjected to high-frequency pulse nanosecond laser remelting treatment, the aluminum alloy plate is rapidly melted by means of the characteristics of high instantaneous energy density, short acting time and the like of high-frequency pulse nanosecond laser, a small molten pool is obtained, the small molten pool has the great supercooling degree, the driving force of crystallization is increased, and ultra-rapid solidification is achieved; and submicron equiaxed crystals with the grain size ranging from 0.55 micrometer to 0.7 micrometer are obtained on the surface of the aluminum alloy, and fine grain strengthening of the surface is achieved. Through the low-temperature rolling and laser remelting processes, the aluminum alloy material with the special structure is prepared, the interior of the aluminum alloy material is of a hardened state high dislocation density structure, and the surface layer of the aluminum alloy material is of a submicron equiaxed structure.

A method operating an HVAC system is provided. The method includes receiving a concentration of refrigerant. The method includes operating the HVAC system in a leak diagnostic mode if the concentration exceeds a gas concentration threshold. The method includes turning on a compressor to compress the refrigerant. The method includes receiving a first saturated liquid temperature and a first subcooled liquid temperature, and determining a first subcooled value based on the difference. The method includes turning off the compressor for a duration, and turning on the compressor after the duration has elapsed. The method includes receiving a second saturated liquid temperature and a second subcooled liquid temperature, and determining a second subcooled value based on the difference. The method includes determining that the first refrigerant circuit includes a refrigerant leak if the second subcooled value or the first subcooled value exceeds a subcooled threshold value.

The invention provides a low-temperature heat pump liquid impact prevention and supercooling degree strengthening control method based on dual-mode self-adaptive regulation and control, which comprises the following steps: monitoring the bottom temperature of a gas-liquid separator and the change rate of the temperature, and controlling the supercooling degree of the gas-liquid separator on the basis of the difference value between the temperature and a preset safety critical temperature and the difference value between the change rate and a preset minimum temperature rise rate, constructing a liquid impact risk index; based on the liquid impact risk index, the pulse power excitation intensity is calculated, the number of opened spraying channels is selected according to the pulse power excitation intensity, the pulse duty ratio of each channel is adjusted, the high-temperature gas-state refrigerant is controlled to be injected into the bottom of the gas-liquid separator, and the liquid-state refrigerant is driven to evaporate; generating a mode switching score, and generating a mode switching signal when the mode switching score exceeds a mode switching threshold value and the temperature of the gas-liquid separator reaches a safety lower limit; and according to the mode switching signal, a supercooling degree strengthening mode is switched, and the opening degree of an economizer branch electronic expansion valve is adjusted according to the deviation between the current supercooling degree and the target supercooling degree.

The invention relates to the technical field of new energy automobile heat management, and belongs to an indirect heat pump heat management system for a new energy automobile. Battery outlet water and warm core outlet water are converged and then shunted through a waterway integration mode of a five-way valve and a proportional three-way valve, and the flow is distributed through the proportional three-way valve; the mixed water enters the battery to control the water inlet temperature of the battery, so that a water-water heat exchanger can be saved, and the effects of reducing cost and improving efficiency are achieved; on the aspect of the agent side, a large-diameter electronic expansion valve is arranged at an outlet of the water-cooling condenser, the internal flow and state of the water-cooling condenser are actively controlled by adjusting the opening degree of the large-diameter electronic expansion valve, the supercooling degree can be increased, the superheat degree can be restrained, the heat exchange capacity and the accurate control capacity can be enhanced, and heating and dehumidification outlet air temperature control in spring and autumn can be better achieved.

The invention relates to the technical field of molten salt, in particular to nitro binary molten salt and a preparation method thereof. The preparation method comprises the following steps: mixing sodium carbonate and a potassium hydroxide solution, and then adding a starch-based grafted crystal inhibitor to inhibit crystallization; adding a nitric acid aqueous solution in two stages, and introducing eutectic seed crystals to guide nucleation at the end of the first stage; crystal distribution is optimized through falling film evaporation and concentration and setting of partial reflux; and after spraying granulation, carrying out short-time melting reforming and controlled cooling in an inert atmosphere. According to the method, the composition uniformity and the structural stability of the molten salt are remarkably improved, so that the product has a melting point close to a theoretical eutectic point, low supercooling degree, high melting latent heat and excellent thermal cycling stability and corrosion resistance, and is suitable for an industrial heat storage system running for a long time.

The utility model relates to the field of air conditioners, and particularly discloses a variable-flow-path heat exchanger and an air conditioner outdoor unit, the variable-flow-path heat exchanger comprises a single-cooling condenser core body, an inlet pipe assembly and an outlet pipe assembly, the single-cooling condenser core body comprises a refrigerant overheating section, and the refrigerant overheating section is communicated with the inlet pipe assembly; the refrigerant two-phase section is communicated with the refrigerant overheating section, one end of the outlet pipe assembly is communicated with the refrigerant overheating section, and the other end of the outlet pipe assembly is communicated with the refrigerant two-phase section; the refrigerant supercooling section communicates with the refrigerant two-phase section, and the refrigerant supercooling section communicates with the end, away from the refrigerant superheating section, of the inlet pipe assembly; and the heat exchange areas of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section are sequentially reduced. According to the scheme, in the process, the gas-liquid state switching of the refrigerant is matched with the heat exchange area of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section in size, so that the refrigerant keeps a stable speed when flowing in the single-cooling condenser core, and the heat exchange efficiency is improved.

The invention relates to a refrigeration system (10) for a motor vehicle (100) that is at least partially driven electrically or by an internal combustion engine, comprising a refrigerant compressor (12); a heat exchanger module (14) with a first heat exchanger surface (16), a second heat exchanger surface (18), in particular a subcooling section, and a refrigerant reservoir (20) connected to the two heat exchanger surfaces (16, 18); a first heat exchanger (22), in particular an evaporator, for conditioning interior air; a second heat exchanger (24; 28), wherein the refrigeration system (10) is configured to be operated in a cooling mode and at least one heat pump mode, including the heat exchanger module (14) and / or the second heat exchanger (24).It is provided that the refrigerant reservoir (20) assigned to the heat exchanger module (14) is fluidically integrated into the refrigeration system (10) in such a way that it can be used as a high-pressure side refrigerant reservoir (20) and / or as a low-pressure side refrigerant reservoir (20). Furthermore, a motor vehicle (100) with such a refrigeration system is described.

The invention discloses a hydrated salt phase change microcapsule and a preparation method thereof.The hydrated salt phase change microcapsule is composed of a nucleating agent modified hydrated salt phase change core material and a polymer / heat conduction material hybrid shell layer, and the phase change microcapsule is prepared by the steps that firstly, the nucleating agent modified low-supercooling-degree inorganic hydrated salt phase change core material is prepared through a melt blending method; then inducing monomer polymerization on an oil-water interface through a W / O inverse emulsion template method to form a polymer shell layer, and finally introducing the modified heat-conducting material into the polymer shell layer to construct a high-heat-conducting shell layer. The phase change microcapsule prepared by the invention has a coating rate higher than 80%, a supercooling degree lower than 3 DEG C, an apparent heat-conducting property greater than 1 W / (m.K), controllable particle size distribution (5-70 [mu] m), excellent encapsulation performance and cycling stability, and has a wide application prospect in the field of heat storage.

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 present invention relates to a bismuth alloy composition and a design method thereof. The alloy composition according to the present invention is an alloy composition comprising bismuth and a second element. The second element selected on the basis of an atomic radius difference between constituent atoms and mixing enthalpy is alloyed in an appropriate content according to a principle of improving liquid stability to provide an alloy composition satisfying a low melting point and a high degree of supercooling and exhibiting excellent flowability, which can be used as a liquid metal ion source.

The invention relates to the technical field of new energy automobile heat management, and belongs to a variable heat return quantity heat management system based on a new energy automobile R290 refrigerant, which can realize the functions of a refrigeration mode, a heat pump heating mode, a hot gas bypass mode and the like. The intermediate heat exchanger is used as a forced supercooling section and a heat regenerator of a water-cooling condenser in a refrigeration mode, and is used as an economizer in a heating mode; through the bypass ERV + EXV throttling mode, the refrigerant flow passing through the intermediate heat exchanger can be dynamically adjusted according to different compressor rotating speeds and suction superheat degrees, and the problem that the suction superheat degree is large when the intermediate heat exchanger is matched with different refrigerant flows is solved. The air suction superheat degree can be accurately adjusted, the COP is improved compared with a traditional system, and meanwhile the reliability of the compressor is guaranteed.

The invention belongs to the related technical field of additive manufacturing, and discloses an electron beam melting wire liquid nitrogen copious cooling additive manufacturing method and system.The method comprises the steps that in the electron beam melting printing forming process, liquid nitrogen is sprayed to a molten printing wire under electron beam irradiation, and the liquid nitrogen is sprayed to the molten printing wire; the molten printing wires are subjected to nitridation reaction under the action of electron beams while being subjected to liquid nitrogen cryogenic cooling, so that the crystal structure of a formed part is regulated and controlled, and the mechanical performance is enhanced; and / or liquid nitrogen is sprayed to the printing wire material which begins to be solidified, so that the printing wire material is subjected to liquid nitrogen deep cooling, and the crystal structure of the formed part is regulated and controlled to achieve mechanical property enhancement. Liquid nitrogen is introduced into the electron beam additive manufacturing device for deep cooling, the extruded printing wire is solidified at an extremely high cooling speed after being melted, a large number of homogeneous nucleation sites are formed in a melting area due to the high supercooling degree, the solidification speed is high, a microstructure is customized into uniform and fine equiaxed crystals, the strength and toughness of the material are improved, and the production cost is reduced. The mechanical property is improved.

The invention belongs to the technical field of phase change heat storage materials, and particularly relates to a phase change composite heat storage and energy storage material and a preparation method thereof. The phase-change composite heat and energy storage material comprises the following raw material components: sodium acetate trihydrate, disodium hydrogen phosphate dodecahydrate, porous silicon dioxide, nano Al2O3, expanded graphite, borax, polyacrylamide and the balance of water. The preparation method of the material comprises the following steps: S1, heating sodium acetate trihydrate to a molten state, and dipping into porous silicon dioxide; s2, adding borax, nano Al2O3, disodium hydrogen phosphate dodecahydrate, polyacrylamide and water, and stirring for dissolving; s3, adding expanded graphite, and grinding; and S4, cooling to obtain the product. The invention aims to solve the key problems of high supercooling degree, phase separation, insufficient phase change latent heat, poor comprehensive performance and the like of the existing phase change heat storage material, and a new material meeting the requirements of building heating, industrial waste heat recovery, solar heat storage and other fields on efficient heat storage and heat management is prepared.

The invention discloses a gas-liquid separator and a taper angle determination method thereof. The gas-liquid separator comprises a shell, a heat insulation barrel, a low-pressure pipeline and a high-pressure pipeline. The heat insulation barrel divides a shell cavity of the shell into an inner cavity and an outer cavity, and the heat insulation barrel is in a big-end-up conical shape; a vent hole is formed in the top of the heat-insulating cylinder, the upper ends of the inner cavity and the outer cavity are communicated through the vent hole, and the lower ends of the inner cavity and the outer cavity are communicated through a lower port of the heat-insulating cylinder; the low-pressure pipeline comprises a low-pressure inlet section, a first low-pressure pipe section and a second low-pressure pipe section which are connected in sequence, the first low-pressure pipe section is of a spiral structure and located in the heat insulation barrel, and the second low-pressure pipe section is of a spiral structure and sleeves the bottom of the heat insulation barrel; the first low-pressure pipe section is provided with a liquid discharge hole; a low-pressure outlet is formed in the top of the shell; at least part of the high-pressure pipeline is located in the shell so as to exchange heat with the liquid-phase medium separated through the low-pressure pipeline. The gas-liquid separator can perform heat exchange on the collected liquid phase refrigerant, so that the supercooling degree of the heat management system can be improved, and the refrigerating capacity is increased.

The invention relates to the technical field of heat pumps, in particular to a control method of a heat pump system, and aims to solve the problem that the opening debugging process of a throttling element is complex and time-consuming. In order to achieve the purpose, according to the control method of the heat pump system, the operation rotating speed and the opening degree of a main throttling element or the operation rotating speed and the opening degrees of the main throttling element and an auxiliary throttling element are determined through the operation frequency, the suction superheat degree, the exhaust superheat degree and the selectively obtained supercooling degree, and then a fan, the main throttling element and the auxiliary throttling element are adjusted based on the opening degrees and the air speed; the operation opening degree of the throttling element and the operation air speed of the fan are matched with the operation frequency of the compressor, so that the energy efficiency ratio of the heat pump system is increased, and the total energy consumption of the heat pump system in the whole operation process is reduced. Meanwhile, the method is simple, the opening degree of the throttling element and the rotating speed of the draught fan do not need to be debugged, the problems that in the prior art, debugging of the opening degree of the throttling element and the wind speed of the draught fan is complex and time-consuming are solved, and the requirement for quick response is met.

The invention relates to an air conditioning system, a control method and device thereof, electronic equipment and a readable storage medium. The method comprises the steps that the operation capacity change trend of the indoor unit at different target superheat degrees or different target supercooling degrees is determined, and the optimal target superheat degree or the optimal target supercooling degree of the indoor unit is determined according to the operation capacity change trend; and the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the optimal target superheat degree or the optimal target supercooling degree, so that the current operation capacity of the indoor unit is adjusted. And the current operation capacity of the indoor unit is detected, and the operation frequency of a compressor is adjusted according to the deviation between the target operation capacity of the indoor unit and the current operation capacity. The problems that according to an existing air conditioning system, the opening degree of an electronic expansion valve of an indoor unit is adjusted through the same target superheat degree or target supercooling degree under different conditions, it is difficult to achieve maximization of the heat exchange capacity of a heat exchanger of the indoor unit, and the whole machine operation energy efficiency level is low are solved.

The invention relates to the technical field of liquid nitrogen preparation, in particular to integrated equipment for preparing nitrogen by a refrigerant method, which comprises an E1 heat exchanger, a separator VF1, an E2 heat exchanger, an E3 heat exchanger, an E4 heat exchanger, a separator VF2 and a liquid storage tank VF3 which are connected in sequence, the E1 heat exchanger, the E2 heat exchanger, the E3 heat exchanger and the E4 heat exchanger are used for gradually cooling nitrogen so that the nitrogen can be converted into liquid nitrogen. According to the method, the cooling temperature is reduced to-183 DEG C in the E4 subcooler, the supercooling degree of liquid nitrogen is improved, and the liquefaction efficiency of nitrogen is better improved; and meanwhile, the vaporization phenomenon of the liquid nitrogen in the storage process is well inhibited. Even if the temperature of the storage environment fluctuates, the liquid nitrogen at-183 DEG C can be kept in a liquid state, so that the volatilization loss is reduced, the storage cost is reduced, and the stable quality of the liquid nitrogen in long-term storage is ensured.

The application provides a kind of shaped phase change material and its preparation method.The phase change material includes the following component materials according to mass percentage: 45.8-56.7% of dodecahydrate disodium hydrogen phosphate, 7.9-22.9% of sodium carbonate decahydrate, 7.6-15.9% of sodium sulfate decahydrate, 2.46-4.05% of reinforcing material, and 15-20% of adsorption material.The preparation of the phase change material includes the following steps: 1, preparing materials;2, preparing inorganic salt mixture;3, preparing molten inorganic salt mixture;4, preparing mixture and sealing;5, preparing shaped phase change material.The shaped phase change material prepared by the application has suitable phase change temperature, higher latent heat of phase change, no liquid leakage, no toxicity and non-combustibility, small supercooling degree, and no phase separation;at the same time, for the application occasions requiring transportation and storage between 20-30℃, the shaped phase change material can be used as an effective normal temperature cold storage agent to resist low temperature environment and protect specific chemicals and medicines from temperature fluctuation.

The invention discloses a reinforcement learning control method for a novel ship cooling system, and the method comprises the steps: determining an input measured value and an output action value of the novel ship cooling system, the input measured value is a state parameter strongly related to a vacuum degree / supercooling degree control target, and the output action value comprises the opening degree of a spraying valve and the rotating speed of a condensate water circulating pump; a reinforcement learning reward function is constructed, and the influence degree of the development process of the seawater heat exchanger on the vacuum degree / supercooling degree is reflected through the reward function; network parameter off-line training is carried out, wherein the network parameter off-line training comprises strategy network off-line training and value network off-line training; and deploying the strategy network and the value network after offline training to a novel cooling system control device, and performing online optimization on strategy network parameters and value network parameters until a vacuum degree / supercooling degree control effect required by an application is met. The control precision, the reliability and the operation efficiency of the novel cooling system of the ship can be improved.

The present application discloses an immersion cooling apparatus and an electronic device. The immersion cooling apparatus comprises a condensation module, a liquid storage module, a pump body and a heat exchange module. The condensation module is used to connect to a cooling module, and the cooling module is used accommodate a heating device. The liquid storage module is connected to the condensation module, and the liquid storage module is connected to the cooling module by means of the pump body. The pump body is used to convey a working medium contained in the liquid storage module to the cooling module. A housing of the heat exchange module is provided with a first heat exchange interface and a second heat exchange interface, a heat exchange flow channel is disposed in the heat exchange module, and the heat exchange flow channel is connected to the first heat exchange interface and the second heat exchange interface. The first heat exchange interface is in communication with the liquid storage module, and the second heat exchange interface is connected to the pump body. In the described solution, the heat exchange module can exchange heat with a liquid working medium in the liquid storage module, reducing the temperature of the liquid working medium, increasing the degree of supercooling of the liquid working medium, and preventing cavitation of the pump body, which can improve reliability of the pump body, and thereby improve reliability of a whole working medium circulating refrigeration system.

A method operating an HVAC system is provided. The method includes receiving a concentration of refrigerant. The method includes operating the HVAC system in a leak diagnostic mode if the concentration exceeds a gas concentration threshold. The method includes turning on a compressor to compress the refrigerant. The method includes receiving a first saturated liquid temperature and a first subcooled liquid temperature, and determining a first subcooled value based on the difference. The method includes turning off the compressor for a duration, and turning on the compressor after the duration has elapsed. The method includes receiving a second saturated liquid temperature and a second subcooled liquid temperature, and determining a second subcooled value based on the difference. The method includes determining that the first refrigerant circuit includes a refrigerant leak if the second subcooled value or the first subcooled value exceeds a subcooled threshold value.

The utility model provides an ultrahigh-pressure low-temperature fluid injection system, and particularly relates to the technical field of low-temperature equipment, the ultrahigh-pressure low-temperature fluid injection system comprises a supply system and an injection system, the supply system comprises a supply unit, a subcooler, a supercharger, an energy accumulator and a heat exchanger; the injection system comprises a nozzle unit and a recovery unit; the supply unit is sequentially connected with the subcooler, the supercharger, the energy accumulator, the heat exchanger and the nozzle unit through pipelines, fluid in the supply unit sequentially passes through the subcooler, the supercharger and the energy accumulator and is subjected to subcooling, supercharging, energy storage and cooling, stable high-pressure low-temperature fluid is obtained, and finally the fluid is sprayed out of the nozzle unit to machine an object. According to the utility model, the stable high-pressure low-temperature fluid is utilized to treat the object, and finally the impurities are recovered and treated, so that the secondary pollution can be reduced, and the cost is reduced.

The invention relates to a zero-loss methane propellant supercooling filling system and method, and the system comprises a liquid nitrogen supply unit, a methane supply unit, a supercooling methane storage tank, a heat exchange pipeline unit and a temperature control unit; the heat exchange pipeline unit comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a separation and recovery module; the liquid nitrogen supply unit is connected with the cold end of the first heat exchanger. The cold ends of the first heat exchanger, the second heat exchanger and the third heat exchanger are sequentially connected in series. Methane output by the methane supply unit exchanges heat with the third heat exchanger and then is input into the supercooled methane storage tank; methane output by the exhaust end of the supercooled methane storage tank exchanges heat with the second heat exchanger and then is input into the separation and recovery module; and the separation and recovery module is connected with the supercooled methane storage tank and the methane supply unit and is used for converging the recovered methane into the supercooled methane storage tank and / or returning the recovered methane to the methane supply unit. According to the method, freezing in methane supercooling filling is effectively avoided, and lossless filling is achieved.

The invention discloses a liquid hydrogen filling device and method, and belongs to the technical field of liquid hydrogen. The device comprises a liquid hydrogen supply tank, a liquid hydrogen receiving tank, a filling pipeline and a pressurizing pipeline, the bottom of the liquid hydrogen supply tank is communicated with the bottom of the liquid hydrogen receiving tank through a filling pipeline; evaporation ends of the low-temperature heat pipes are positioned in the hydrogen adsorption module, and condensation ends of the low-temperature heat pipes are positioned in the metal cavity and are provided with metal fins; the head end of the pressurizing pipeline is divided into two branches, the first branch is connected with the filling pipeline, the first pressurizing valve, the intermittent heater and the metal cavity, the second branch is connected with the top of the liquid hydrogen receiving tank and the second pressurizing valve, and the two branches are combined and then connected with the liquid hydrogen supply tank. The pressure in the receiving tank in the filling process is reduced through the hydrogen adsorption module, the filling success rate is increased, meanwhile, liquid hydrogen is used for conducting non-contact cooling on the hydrogen adsorption module, vaporized hydrogen obtained after cooling serves as pressurized gas of the supply tank, the pressure in the hydrogen adsorption module is kept stable, and a certain supercooling degree is provided for operation of the liquid hydrogen pump.

In the conventional refrigerant leakage detection method, when a failure occurs in the temperature sensor or the pressure sensor, the refrigerant leakage may not be detected.SOLUTION: The refrigerant leakage detection system 1 includes the chiller 10 and the input unit 110. The chilled water chiller 10 has a refrigerant circuit 50 through which a refrigerant circulates. The input unit 110 acquires the degree of supercooling and the expansion valve opening degree from the cold water chiller 10. The controller 120 performs refrigerant leakage determination using the degree of subcooling, or refrigerant leakage determination using the expansion valve opening degree. When the priority of the refrigerant leak determination using the degree of subcooling is higher than the priority of the refrigerant leak determination using the expansion valve opening degree, the controller 120 switches between the refrigerant leak determination using the degree of subcooling and the refrigerant leak determination using the expansion valve opening degree on the basis of whether or not the degree of subcooling is normal.SELECTED DRAWING: Figure 4

The invention provides an inorganic salt / carbon aerogel composite phase change material and a preparation method thereof, and belongs to the technical field of phase change material preparation. The composite phase change material is prepared through electrochemical stripping, HF etching, freeze drying, high-temperature carbonization and vacuum impregnation. The electrochemical exfoliated graphene and the TiC / carbon aerogel are combined together through self-assembly to construct a heterogeneous interface and increase effective nucleation sites, so that the energy potential barrier of phonon scattering and nucleation is reduced, and the thermal conductivity is improved while the degree of supercooling is reduced; the aerogel adsorbing the inorganic salt phase change material forms hydrogel with a compact network through self-assembly, crystallization of the hydrated salt is promoted, and the hydrated salt inorganic phase change material is limited in a porous material by utilizing the confinement effect of a nano material, so that the hydrated salt inorganic phase change material is not easy to leak, and relatively good latent heat is maintained.

The utility model relates to the technical field of air conditioners, in particular to a composite cooling air conditioning system which comprises an outdoor heat exchange assembly, an indoor heat exchange assembly and a refrigerant power assembly. The outdoor heat exchange assembly comprises a cooling tower, a water-cooling heat exchanger and an air-cooling heat exchanger; the water-cooling heat exchanger is communicated with the air-cooling heat exchanger; a pre-cooling piece and a water supply assembly are arranged in the cooling tower; cooling liquid of the water supply assembly is in contact with the water-cooling heat exchanger after passing through the pre-cooling piece. An outdoor fan is arranged on the air outlet side of the air-cooled heat exchanger; and the pre-cooling piece is arranged between the air-cooling heat exchanger and the water-cooling heat exchanger. Refrigerant is firstly condensed and cooled in the air-cooling heat exchanger and then enters the water-cooling heat exchanger to be cooled for the second time, and the cooling mode of the water-cooling condenser is air cooling and water cooling, so that the temperature of the refrigerant is lower, the supercooling degree of the refrigerant in the system is improved, and the condensation enthalpy difference value of the refrigerant is increased; therefore, the whole system is more energy-saving in the operation process.