573 results about "Subcooling" patented technology

The invention discloses an LNG storage tank BOG liquefaction recovery system and a control method thereof.The system comprises an LNG storage tank, an LNG buffer tank, an LNG pump and a refrigerating machine, the LNG pump is installed in the LNG buffer tank, when BOG in the LNG storage tank needs to be recovered, BOG conveyed by the LNG storage tank is cooled and liquefied through the refrigerating machine and then returns to the LNG storage tank, recovery of BOG gas in the LNG storage tank is achieved, and in the BOG recovery process, the BOG is recovered through the refrigerating machine. And when the supercooling degree of the LNG storage tank needs to be maintained, the LNG conveyed by the LNG storage tank is cooled through the refrigerating machine, the cooled LNG returns into the LNG storage tank, and after the cooled LNG is mixed with the LNG in the LNG storage tank, the temperature of the LNG in the LNG storage tank is reduced, so that the supercooling degree of the LNG storage tank is maintained. The whole system is simple in structure, BOG in the LNG storage tank can be liquefied and recycled, and the supercooling degree of the LNG storage tank can be maintained.

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 invention provides a heat exchange piece testing device, a testing system and a testing method. The heat exchange piece testing device comprises a compressor, a condenser, a subcooler, a first temperature and pressure sensor, a first expansion valve, a second temperature and pressure sensor and a second expansion valve, a first fan is arranged on one side of the condenser, a second fan is arranged on one side of the subcooler, and an inlet of the condenser is communicated with an outlet of the compressor. A first flow path is arranged between an outlet of the condenser and a first port of the heat exchange piece, a second flow path is arranged between a second port of the heat exchange piece and an inlet of the compressor, and in a refrigeration mode, the first flow path sequentially passes through the subcooler, the first temperature pressure sensor and the first expansion valve; the second flow path sequentially passes through a second temperature pressure sensor and a second expansion valve, the rotating speed of the first fan is adjustable to control the condensing pressure, the rotating speed of the second fan is adjustable to control the degree of supercooling, the opening degree of the first expansion valve is adjustable to control the degree of superheat, and the opening degree of the second expansion valve is adjustable to control the evaporation pressure.

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 a horizontal integrated hairpin type feed water heater for a power plant. The horizontal integrated hairpin type feed water heater comprises a left pipe box, a right pipe box, two pipe plates, a group of feed water inlet and outlet pipes, a U-shaped pipe bundle, two straight-section shells, a hairpin bend connected with the two straight-section shells, a steam inlet, a drain outlet and other parts. The device is particularly suitable for heaters with small pipe side feed water flow and higher temperature rise; the high-temperature feed water and the low-temperature feed water are distributed in the two relatively independent tube boxes, so that the temperature difference stress of a tube plate and a tube box sealing head is avoided; the overheating section, the condensation section and the subcooling section are integrated in one device, so that the occupied area of the device and the number of connecting pipelines can be reduced; deformation stress caused by thermal displacement difference of two sections of barrel bodies of the equipment can be greatly reduced through four-support configuration; the overall height of the equipment can be reduced through horizontal arrangement, and overhaul and maintenance are facilitated.

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 utility model discloses an air-cooled heat pump evaporation spraying system controlled by supercooling degree, which comprises a refrigerating system and a spraying system, and an atomizing nozzle of the spraying system is aligned with a condenser of the refrigerating system. The spraying system comprises a water storage tank, an electronic water treatment instrument, a constant pressure pump, a countercurrent heat exchanger A, a countercurrent heat exchanger B and an atomizing nozzle which are sequentially connected with a water outlet of the water storage tank through a pipeline, an outdoor environment temperature sensor, and an exhaust temperature sensor mounted on an exhaust port pipeline of the compressor; the upstream temperature sensor and the pressure sensor are installed on a pipeline in front of the electronic expansion valve, and the constant pressure pump, the environment temperature sensor, the exhaust temperature sensor, the upstream temperature sensor and the pressure sensor are electrically connected with the controller and are monitored and controlled by the controller. By means of the mode, whether spraying is needed or not is determined according to the degree of supercooling, and the condensation area and the evaporation area of a refrigerating system are increased.

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 discloses a preparation method for producing an ultra-pure oxygen-free copper rod through an up-drawing continuous casting method, and belongs to the technical field of metal material machining. Comprising the following steps: selecting a cathode copper sheet as a raw material, performing oxygen-free copper rod traction in a three-body furnace consisting of a melting furnace, a transition bin and a holding furnace by adopting an up-drawing continuous casting method, adding the dried electrolytic copper sheet and charcoal into the melting furnace, and adjusting the temperature of a melt in the melting furnace; the molten copper liquid automatically flows into a transition bin to be subjected to standing and impurity removal, and charcoal and graphite flakes are laid on the surface of the copper liquid; a graphite crystallizer is inserted into molten copper, a guide rod is connected, a guide rod is prepared, the inlet and outlet water temperature of the crystallizer is adjusted, and the traction speed and pitch of a cast rod are set. According to the method, the oxygen content of the produced ultra-pure oxygen-free copper rod can be reduced to 3 ppm or below by controlling the quality of the cathode copper sheet of the copper rod, the temperature of the copper liquid, the solidification supercooling degree of the copper rod, the rod casting speed, the conditions of the crystallizer and combined control over charcoal and graphite flake reduction, and the application additional value of the oxygen-free copper rod is greatly improved.

The invention discloses an LNG storage tank supercooling degree maintaining system and a control method thereof. The LNG storage tank supercooling degree maintaining system comprises an LNG storage tank, an LNG pump pool, an LNG pump and a refrigerating machine, and the LNG pump is installed in the LNG pump pool; a liquid phase outlet and a bottom liquid inlet are formed in the bottom of the LNG storage tank, a top liquid inlet is formed in the top of the LNG storage tank, a liquid phase inlet is formed in the bottom of the LNG pump pool, when the system works, LNG in the LNG storage tank is conveyed to the refrigerating machine through the LNG pump to be cooled, the cooled LNG returns to the bottom liquid inlet of the LNG storage tank to reduce the temperature of the LNG in the LNG storage tank, and therefore the supercooling degree of the LNG storage tank is maintained; or returning to a top liquid inlet of the LNG storage tank to reduce the temperature of part of BOG in the LNG storage tank and liquefy the part of BOG to ensure that the LNG storage tank is not overpressure. The LNG storage tank can be cooled and depressurized, so that the supercooling degree of the LNG storage tank is maintained within the LNG inlet liquid supercooling degree range required by the operation of the immersed pump of the LNG station, and cavitation caused by insufficient supercooling degree of sucked LNG of the immersed pump is effectively avoided.

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.

A heat pump system according to an aspect of the disclosed invention may comprise: a compressor for compressing a refrigerant; a refrigerant-water heat exchanger in which heat exchange is performed between the compressed refrigerant and introduced water; an expansion valve for expanding refrigerant condensed in the refrigerant-water heat exchanger; an outdoor heat exchanger in which heat exchange is performed between the refrigerant expanded by the expansion valve and outdoor air; a high pressure sensor for sensing a high pressure saturation temperature of the refrigerant compressed in the compressor; an inflow water temperature sensor for sensing the temperature of water entering the refrigerant-water heat exchanger; a condensation temperature sensor for sensing the temperature of the refrigerant condensed in the refrigerant-water heat exchanger; an outdoor temperature sensor for sensing an outdoor temperature; and a control part which determines a reference supercooling degree of the refrigerant on the basis of the sensing results of the outdoor temperature sensor and the inflow water temperature sensor and an operating frequency of the compressor, determines a current supercooling degree of the refrigerant on the basis of the sensing results of the high pressure sensor and the condensation temperature sensor, and compares the reference supercooling degree and the current supercooling degree so as to determine whether there is a leak of the refrigerant.

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.

A phase change material composition for latent heat storage is provided. The composition includes a eutectic mixture of two or more salt hydrates, and at least one salt additive each selected from a bromide salt and a bromide salt hydrate. The mixture of salt hydrates has a melting temperature above room temperature. The at least one salt additive decreases the melting temperature of the mixture and reduces a degree of supercooling of the mixture. The mixture of salt hydrates may be a mixture of calcium chloride hexahydrate and magnesium chloride hexahydrate. The salt additives may include both calcium bromide and magnesium bromide. The melting temperature of the phase change material composition may be in a range of approximately 15 to 25° C. A thermal energy storage system including the phase change material composition and a method of heat management in the thermal energy storage system are also provided.

The utility model provides a liquid oxygen deep supercooling system, which relates to the field of low-temperature filling of carrier rockets, and is characterized in that a liquid oxygen storage tank stores liquid oxygen, and a liquid nitrogen storage tank stores liquid nitrogen; a tube pass inside the subcooler is communicated with the liquid oxygen storage tank, and a shell pass outside the subcooler is communicated with the liquid nitrogen storage tank; the supplied liquid oxygen and the liquid nitrogen are subjected to heat exchange in the subcooler, and the liquid oxygen is cooled by the liquid nitrogen; in the process, the vacuum generator is used for vacuumizing the shell pass, the temperature of the liquid nitrogen serving as the refrigerant is further reduced under the condition that the air pressure is reduced, the liquid nitrogen in the shell pass is further cooled, the temperature of the liquid oxygen is further reduced, the super-cooled liquid oxygen is prepared, the super-cooled liquid oxygen can be filled into the rocket, and the overall performance of the rocket is further improved.

The invention relates to the technical field of compression refrigeration, in particular to an air conditioner heat pump system and an air conditioner. The air conditioner heat pump system comprises a heat regenerator and a throttling component. The heat regenerator is provided with a first heat regeneration pipe and a second heat regeneration pipe; the throttling component is arranged on a refrigerant channel between the condenser and the evaporator and communicates with the first heat return pipe and the second heat return pipe. And under the refrigerating working condition and the heating working condition, the refrigerant before throttling enters the first heat return pipe, and the refrigerant after throttling enters the second heat return pipe, so that the refrigerant in the first heat return pipe exchanges heat with the refrigerant in the second heat return pipe. According to the heat exchanger, through the throttling component, a refrigerant before throttling can enter the first heat return pipe, the refrigerant after throttling can enter the second heat return pipe, and the refrigerant in the first heat return pipe exchanges heat with the refrigerant in the second heat return pipe, so that the refrigerant in the first heat return pipe is reduced, and the supercooling degree of the refrigerant is improved; the problem that in the prior art, an air conditioner heat pump system cannot improve the supercooling degree of a refrigerant under the heating working condition is solved.

The invention provides a cold plate surface anti-condensation control method and system based on model prediction, and the method comprises the steps: 1, obtaining cold plate surface temperature data and a cold plate surface condensation image when a liquid cooling plate operates for a preset period of time through a cold plate cooling experiment and CFD simulation, supercooling degree and condensation delay time data are obtained through the condensation image; 2, performing multi-parameter nonlinear fitting on the cold plate surface temperature data in the cold plate operation process to form a cold plate surface temperature prediction model; and step 3, utilizing the prediction model, controlling the MPC to control a fluid inlet valve of the cold plate through model prediction, and closing the valve before condensation on the surface of the cold plate. The MPC is controlled through model prediction to control the fluid inlet valve of the cold plate, the valve is closed before dew formation on the surface of the cold plate, the dew formation risk is remarkably reduced, the workload of a refrigeration system is reduced, the liquid cooling plate operates at a smaller safety temperature difference, and the reliability of the liquid cooling system 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 provides a shaped phase change material and a preparation method thereof. The phase change material is prepared from the following raw materials in percentage by mass: 45.8 to 56.7 percent of sodium phosphate dibasic dodecahydrate, 7.9 to 22.9 percent of sodium carbonate decahydrate, 7.6 to 15.9 percent of sodium sulfate decahydrate, 2.46 to 4.05 percent of a reinforcing material and 15 to 20 percent of an adsorbing material. The preparation method of the phase change material comprises the following steps: 1, preparing materials; 2, preparing an inorganic salt mixture; 3, preparing a molten inorganic salt mixture; 4, preparing a mixed material and sealing; and 5, preparing the shaped phase change material. The shaped phase-change material prepared by the invention has the advantages of proper phase-change temperature, higher phase-change latent heat, no liquid leakage, no toxicity, no inflammability, small supercooling degree and no phase separation; meanwhile, for application occasions where transportation and storage need to be carried out at the temperature of 20-30 DEG C, the shaped phase change material can serve as an effective normal-temperature cold storage agent and is used for resisting a low-temperature environment so as to protect specific chemicals and pharmaceuticals from being influenced by temperature fluctuation.

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.