408 results about "Supercooling" patented technology

The invention discloses a dynamic load adaptive charging pile liquid cooling control method, relates to the technical field of thermal management, and solves the problems of temperature prediction deviation, local hot spot leak detection and protective supercooling caused by a simplified thermal model based on fixed parameters and key temperature points under rapid load fluctuation. Parameterization time-varying heat supply network parallel multi-rate observation is constructed, a heat exchange coefficient and node heat capacity are identified and calibrated through recursion with physical constraints, transmission time delay is merged into an extended state in an explicit mode, short-window high-frequency sampling and local temperature field reconstruction are triggered based on residual errors, and the time-varying heat supply network parallel multi-rate observation is achieved. A control sequence is issued in parallel by adopting hierarchical rolling type control with a second-order moment uncertainty constraint; based on the scheme, the short-term temperature field prediction precision and the local hot spot identification capability are improved, and the cooling resource directional utilization efficiency and the charging system operation continuity are remarkably improved.

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 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 invention discloses a switchgear control device and method based on an electrolytic dehumidification membrane with a wide working range, which relates to the technical field of moisture-proof dehumidification equipment. The wide working range (−10 to 70° C., 20%-100% RH) is applicable in cold, hot, and other extreme environments, with no icing, frosting, or damage due to supercooling, overheating, and other issues.

The invention relates to the technical field of energy control, and provides an ultra-low environment temperature carbon dioxide-based dual energy supply control system, which comprises a main circulation unit, an auxiliary circulation unit, a heat exchange water path module and a controller, a CO2 heating loop is adopted in the main cycle, and an R134a condensation supercooling loop is adopted in the auxiliary cycle; a controller constructs a directed graph structure based on thermodynamic topology, a three-branch convolution mechanism is adopted to model an energy transfer path, embedded representation is optimized and controlled in combination with an interval-contrast loss function, and an accurate control instruction is generated to adjust components such as a compressor and a throttling valve; in the aspect of fault diagnosis, a time parameterization convolution-symmetric GRU model is constructed, a Legendre polynomial is utilized to model a time convolution kernel, a Verlet integral mechanism is combined to reconstruct a hidden state path, and accurate identification of an abnormal trend in multi-source data is realized. According to the system, the energy supply stability and the intelligent level in the extremely low-temperature environment are improved.

The invention discloses a biological material supercooling storage system and a working method thereof. The biological material supercooling storage system comprises a sample carrier for storing and placing a biological material; the sample cavity is used for providing a subcooled storage environment of-30 to-5 DEG C for the biological material; the temperature control module is used for providing a controllable cooling rate for the interior of the refrigeration module, the cooling rate is greater than 2 DEG C / min in a temperature interval of above 5 DEG C, the cooling rate is 1-2 DEG C / min in a temperature interval of 0-5 DEG C, and the cooling rate is less than 1 DEG C / min in a temperature interval of below 0 DEG C; the electromagnetic excitation module is used for generating a low-frequency to very high-frequency 50Hz-300MHz electromagnetic field in the sample, and inhibiting the formation and growth of ice crystals in the sample by using the non-thermal effect of the electromagnetic field; the cooperative control module is used for achieving cooperative control over the cooling rate, the supercooling temperature and the electromagnetic field intensity so as to maintain long-term storage of the samples in a liquid state at the supercooling temperature, the storage temperature of the biological materials is reduced, meanwhile, the biological materials are not frozen, and liquid-state storage of the biological materials with different sources and different sizes at the low temperature can be achieved.

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 utility model discloses a midsole secondary foaming forming machine cooling device which comprises a base, the top of the base is fixedly connected with a fixing block, one side of the fixing block is provided with a round through groove, a placing assembly used for placing a mold is arranged in the round through groove, the top of the base is fixedly connected with a bearing seat, and the bearing seat is provided with a bearing block. A cylinder is rotationally connected into the bearing seat through a bearing, a cavity is formed in the cylinder, a spiral pipe is fixedly connected into the cavity, and a connecting frame is fixedly connected to the inner wall of the cylinder. According to the utility model, the surface of the mold can be uniformly cooled through rotating centrifugal force, the problems of local supercooling and insufficient cooling of the mold are reduced, the deviation of medium and low density is reduced, the rotating speed required by different foaming materials can be matched, the rotating speed adjusting time is shortened, and the convenience of the device is improved; and the placing frame can be pushed to the middle of the cylinder, so that the production efficiency of the device is improved.

The invention relates to the technical field of heat management, in particular to a heating control system of a photovoltaic street lamp energy storage device, which comprises an early warning monitoring module for judging whether the energy storage device enters a low-temperature early warning state or not according to real-time temperature data. And if entering the early warning state, the hot area modeling module extracts temperature gradient characteristics through thermal infrared threshold segmentation, constructs a heating efficiency model and calculates the optimal heating power, and the partition heat supply module drives heating elements to perform partition heating according to the optimal power. If not, the temperature difference evaluation module calculates a difference value matrix through the temperature uniformity image and judges whether a local supercooling area exists or not. And if yes, the supercooling heat compensation module generates a compensation heating signal to directionally heat the supercooling area until the temperature of the energy storage device is in a normal working interval without early warning and with uniformity. According to the system, efficient and energy-saving low-temperature heating control is achieved through intelligent zoning and directional heating.

The invention provides a collaborative model prediction control method for a regional cooling system penetrating through a source network load full chain, and belongs to the technical field of intelligent control of cooling systems. Collecting and preprocessing meteorological and operation characteristic data of the system; inputting the data into an Attention-LSTM cold load prediction model, determining an optimal step length in combination with thermal inertia analysis, and outputting a cold load prediction sequence; based on the unified energy path theory, a pipe network quasi-steady-state hydraulic and thermal coupling mechanism model is constructed; by taking load prediction as input and the coupling model as constraint, establishing an optimization model containing three targets of pump consumption power and the like; rolling optimization is carried out by adopting a multi-target particle swarm optimization algorithm, and optimal operation parameters meeting thermal unbalance degree constraints are obtained; and in combination with the peak-valley electricity price, a cold source unit and cold storage device collaborative scheduling strategy is formulated, and a final control instruction is generated. The phenomena of insufficient cold supply at the tail end and local supercooling caused by hydraulic imbalance of a pipe network and large hysteresis characteristics are effectively solved, and optimal control over the operation cost is achieved.

The invention relates to a system for full-supercooling large-flow liquid methane filling and a using method of the system. The full-supercooling large-flow liquid methane filling system is stable, reliable, high in automation degree, capable of dynamically adjusting the supercooling temperature and flow of liquid methane and high in accuracy, and comprises a storage box, a pressurization module, a recovery module, a methane filling module, a control module and a nitrogen filling module, and the pressurization module comprises a methane pressurization tank; the methane filling module comprises a methane filling tank, the nitrogen filling module comprises a nitrogen filling tank and a subcooler, the recovery module comprises a methane recovery tank, and the control module pressurizes the methane recovery tank and the methane filling tank by controlling the pressurization module and adjusts the filling flow and temperature of methane to prevent condensation by controlling the methane filling module and the nitrogen filling module. Flow stabilization and backflow are carried out by controlling the methane filling module and the recovery module.

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 invention belongs to the technical field of clothes processing equipment, and particularly relates to a series-connection supercooling deep dehumidification heat pump clothes dryer and a control method.The series-connection supercooling deep dehumidification heat pump clothes dryer comprises a drying chamber, a circulating air duct, a heat pump system, a rotating wheel dehumidification device, a dehumidification air duct, a subcooler and a control system, and an evaporator and a condenser are arranged in the drying air duct; first-stage condensation dehumidification and second-stage adsorption dehumidification are achieved; the rotating wheel dehumidification device is provided with a dehumidification area and a moisture absorption area, external fresh air is introduced through a dehumidification air duct for dynamic regeneration, and the subcooler and the heat pump system are connected in series and used for heating the fresh air and improving the supercooling degree of a refrigerant. Dynamic adjustment of the drying process is achieved through a multi-stage dehumidification structure and a fan variable speed control strategy, the dehumidification depth and the heat recovery efficiency are improved, the drying time is shortened, energy consumption is reduced, and the clothes care effect is improved.

The invention discloses a low-temperature phase change energy storage material and a preparation method thereof, and relates to the technical field of cold storage materials. The provided organic phase-change material is formed by jointly matching alkane and fatty alcohol, the melting temperature of the organic phase-change material is 0-10 DEG C, the crystallization temperature is-5-5 DEG C, and the melting temperature and the crystallization temperature can be adjusted according to requirements. The material has high latent heat of phase change, and can be efficiently used in scenes of cold chain transportation, refrigeration house energy conservation and the like. The material is non-toxic and harmless, has stable cycle performance, and effectively overcomes the defects of poor cycle performance, easy phase separation, large supercooling degree and the like of an inorganic material. The material is applied to cold storage energy conservation or cold chain transportation, and the effects of energy conservation, environmental protection and electric charge saving can be achieved by utilizing the valley electricity energy storage principle.

This invention discloses a method for preparing a uniform microstructure on the surface of a containerless solidified niobium alloy for a space station, relating to the field of containerless materials science experimental technology. The method first screens for highly supercooled samples suitable for preparing a uniform microstructure using this method in containerless space station experiments; calculates or experimentally determines the primary phase dendrite growth rate, the cooling rate coefficient of radiative heat dissipation during the cooling stage, and the primary phase nucleation rate; and conducts containerless space station experiments to allow the niobium alloy to undergo deep supercooling and rapid solidification within a determined suitable supercooling range, thus obtaining a solidified alloy sample with a uniform surface microstructure. This invention actively controls the distribution of dendrites and eutectic phases, resulting in a surface microstructure with uniformly distributed dendrites and interdendritic eutectic phases.

The embodiment of the present application discloses a supercooling degree control method, device and system. The supercooling degree includes at least one of the supercooling degree of the condenser outlet and the supercooling degree of the expansion valve inlet. The inlet of the condenser is communicated with the compressor, the outlet of the condenser is communicated with the evaporator, the expansion valve and the electromagnetic valve are arranged in the communication pipeline of the condenser and the evaporator, the condensing fan is arranged near the condenser, the control method comprises: obtaining the current temperature and pressure of the condenser outlet and the current temperature and pressure of the expansion valve inlet; determining the current supercooling degree of the condenser outlet according to the current temperature and pressure of the condenser outlet, and determining the current supercooling degree of the expansion valve inlet according to the current temperature and pressure of the expansion valve inlet; and controlling the working state of the condensing fan, the expansion valve and the electromagnetic valve according to the current supercooling degree of the condenser outlet and the current supercooling degree of the expansion valve inlet. The supercooling degree control method, device and system provided by the embodiment of the present application can improve the control reliability.

The utility model provides a full supercooled liquid methane filling system. The full supercooled liquid methane filling system comprises a refrigerant filling module, a supercooled liquid methane module and a liquid methane filling module. Wherein the refrigerant filling module is connected with a liquid methane supercooling storage tank of the supercooling liquid methane module through a filling pipeline and is used for supercooling liquid methane in the liquid methane storage tank. And the supercooled liquid methane module is connected with the liquid methane filling module through a pipeline and is used for filling cooled liquid methane into the rocket storage tank. The liquid methane supercooling storage tank comprises a liquid methane storage tank and a heat preservation layer located outside the liquid methane storage tank, and a refrigerant interlayer is arranged between the liquid methane storage tank and the heat preservation layer and used for containing the refrigerant provided by the refrigerant filling module and cooling liquid methane in the liquid methane storage tank. According to the filling system, the liquid methane supercooling efficiency can be improved, liquid methane crystallization is avoided, the supercooling process is stable and efficient, and the economic benefit of the supercooling filling process is high.

The application relates to an air conditioner control method and device, air conditioner equipment, a storage medium and a computer program product. The current operating parameter and the current condenser inlet air temperature of an air conditioner in a refrigeration mode are acquired, the current supercooling degree prediction value is obtained by performing supercooling degree prediction based on the current operating parameter of the air conditioner, the current supercooling degree target value is determined according to the current condenser inlet air temperature, finally, the current air conditioner adjustment strategy is obtained based on the difference between the current supercooling degree prediction value and the current supercooling degree target value, and the air conditioner is controlled to operate based on the current air conditioner adjustment strategy. The application can predict the supercooling degree at the condenser outlet by using the existing system parameters of a portable air source heat pump air conditioner, without modifying the structure and adding additional hardware equipment, thereby improving the adaptive adjustment capability of the air conditioner condenser and optimizing the control strategy of the portable air source heat pump air conditioner.

The utility model discloses a kind of multi-connection heat pipe air conditioning systems, comprising: primary side refrigeration pipeline, including the compressor unit, condenser connected in turn, throttling device and heat exchanger;Secondary side refrigeration pipeline is connected in indoor terminal, including the first pipeline and the second pipeline in parallel arrangement, first pipeline and heat exchanger are connected in series to carry out heat exchange, the second pipeline is connected in series with condenser, the outlet end of first pipeline and the outlet end of second pipeline meet, and liquid accumulator and refrigerant pump unit are sequentially connected;Supercooling pipeline, the inlet end of supercooling pipeline is connected to the downstream of throttling device, and outlet end is connected to the suction side of compressor unit;The middle section of supercooling pipeline is arranged in the inside of liquid accumulator, using part low-temperature refrigerant in primary side refrigeration pipeline to carry out active heat exchange to liquid accumulator in secondary side refrigeration pipeline, reduce the refrigerant pressure in liquid accumulator under extreme hot weather such as summer;Overcome the problem of slow start caused by the pressure of traditional system is too high due to liquid accumulator.

The utility model discloses a supercooling integrated gas-liquid separator which belongs to the technical field of air conditioners and comprises a tank body, an air inlet pipe and an air outlet pipe, the top of the tank body is connected with the air outlet pipe and the air inlet pipe, one end of the air outlet pipe and one end of the air inlet pipe are both located inside the tank body, the other end of the air outlet pipe and the other end of the air inlet pipe are both located outside the tank body, and a supercooling double pipe and an auxiliary path inlet pipe are arranged in the tank body. The upper portion of the supercooling double pipe is connected with the upper portion of the auxiliary path inlet pipe through a tee joint, and the lower portion of the supercooling double pipe is connected with the lower portion of the auxiliary path inlet pipe through an electronic expansion valve. The supercooling coil is arranged in the gas-liquid separator, the supercooling function and the gas-liquid separation function are integrated into the gas-liquid separator, the space of the tank body is fully utilized, secondary heat exchange of a high-pressure side refrigerant and a low-pressure side refrigerant is achieved, the supercooling degree of the high-pressure side refrigerant is increased, the superheat degree of the low-pressure side refrigerant is improved, and the system performance is improved.

According to the efficient steam heat pump system with the subcooler and the control method, the outlet end of a compressor is connected with the inlet end of a condenser, the outlet end of the condenser is connected with a refrigerant inlet of the subcooler through a liquid storage device, and a refrigerant outlet of the subcooler is connected with an inlet of an evaporator through an electronic expansion valve; the evaporator outlet is connected with the inlet end of the compressor; the flow of cold water entering the subcooler is controlled through the proportional three-way adjusting valve, the water outlet end of the subcooler is connected with the water inlet end of the condenser, the flow of the cold water entering the condenser is adjusted through the flow adjusting valve, and redundant flow enters the redundant heat storage box through the electric valve. The supercooler and the redundant heat storage box are additionally arranged, so that the supercooling degree of a refrigerant is accurately controlled, the system efficiency is improved, the comprehensive utilization rate of energy can be effectively improved, and the system operation cost is reduced.

The embodiment of the invention provides an estimation method and device for refrigerant stock of a refrigerating system and the refrigerating system. The method comprises the steps that first temperature information and first pressure information of a refrigerant at an outlet of a condenser and second temperature information of a refrigerant at an inlet of an expansion valve are obtained; according to the first pressure information and the first temperature information, the supercooling degree of an outlet of the condenser is determined; according to the difference between the supercooling degree of the outlet of the condenser and a preset supercooling degree threshold value, it is judged that abnormal flash gas exists in the refrigerating system; according to the first temperature information, the second temperature information and latent heat of vaporization of the refrigerant under the first pressure information, the flash gas ratio is calculated, the supercooling degree of an outlet of the condenser is corrected, and the corrected supercooling degree is obtained; and according to the corrected supercooling degree of the condenser outlet, the refrigerant stock of the refrigerating system is estimated based on a correlation model of the corrected supercooling degree of the condenser outlet and the refrigerant stock. According to the technical scheme provided by the embodiment of the invention, the accuracy of quality estimation of the refrigerant stock can be improved.

The utility model relates to the technical field of gear dies, and discloses a gear hot die forging die with a cooling channel, a lower die is mounted at the center of the upper surface of a bottom plate, a positioning column for positioning is fixedly mounted at the side end, corresponding to the lower die, of the upper surface of the bottom plate, and a top plate for supporting is fixedly mounted at the upper end of the positioning column; the upper heat conduction layer is in close contact with the cooling water pipe, and the lower heat conduction layer is connected with the cooling water pipe through a connecting pipe, so that the double heat conduction structure greatly improves the heat conduction efficiency, and the mold can be rapidly cooled in cooperation with the heat dissipation effect of the ventilation opening; and the cooling water pipe, the auxiliary pipe and the annular pipe are arranged in a surrounding manner, so that all parts of the mold can be uniformly cooled, the local overheating or supercooling condition is avoided, the uniformity of a mold temperature field is ensured, and the consistency and stability of gear forming are favorably improved.

A heat pump system according to an aspect of the disclosed invention may include: a compressor for compressing a refrigerant; a refrigerant-water heat exchanger performing heat exchange between the compressed refrigerant and the introduced water; an expansion valve for expanding the refrigerant condensed in the refrigerant-water heat exchanger; an outdoor heat exchanger performing heat exchange 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; the water inlet temperature sensor is used for sensing the temperature of water entering the refrigerant-water heat exchanger; the condensation temperature sensor is used for sensing the temperature of the refrigerant condensed in the refrigerant-water heat exchanger; the outdoor temperature sensor is used for sensing the outdoor temperature; the control component determines the reference supercooling degree of the refrigerant based on the sensing results of the outdoor temperature sensor and the water inlet temperature sensor and the operation frequency of the compressor, determines the current supercooling degree of the refrigerant based on the sensing results of the high pressure sensor and the condensation temperature sensor, and compares the reference supercooling degree with the current supercooling degree. To determine whether there is a refrigerant leak.

The invention discloses a liquid oxygen circulation supercooling system, and relates to the technical field of liquid oxygen storage management, liquid oxygen is stored in a liquid oxygen storage tank, the liquid oxygen enters a self-pressurization vaporizer from a vaporization liquid inlet pipe to be vaporized, oxygen generated by vaporization enters the liquid oxygen storage tank from a vaporization steam exhaust pipe, so that the pressure in the liquid oxygen storage tank is increased, and the liquid oxygen is discharged into a pipe needing to be cooled after being increased; the supercooling process is realized when the liquid oxygen in the pipe needing to be cooled flows through the cooler, and the liquid oxygen flows back to the liquid oxygen storage tank again after being supercooled; the device is applied before a launching task starts, liquid oxygen in the liquid oxygen storage tank is supercooled through continuous liquid oxygen circulating flow, compared with supercooling when liquid oxygen is injected into a rocket, supercooling is conducted in advance in the storage stage, injection peak flow does not need to be matched, the size of the device is smaller, and the manufacturing cost is lower.

The application provides a control method, a control device and a heat pump system, and the control method comprises the following steps: obtaining the exhaust temperature of a compressor; determining whether the exhaust temperature of the compressor meets a first set temperature condition; obtaining the supercooling degree of the economizer; and adjusting the main electronic expansion valve and / or the auxiliary electronic expansion valve according to the interval range of the supercooling degree of the economizer. The application provides a control method, a control device and a heat pump system, and the supercooling degree of the economizer is detected and determined when the exhaust temperature is too high and needs to be inhibited, the supercooling degree of the economizer is detected, the auxiliary valve is adjusted while the main valve is closed, the supercooling degree of the economizer is increased, the air supplement is increased, and the exhaust temperature is reduced.

The invention belongs to the technical field of microstructure simulation in the solidification process, and particularly relates to a nickel-based superalloy laser welding solidification structure evolution law prediction method and system.The method comprises the steps that simulation parameters are determined, a macroscopic temperature field is simulated to obtain molten pool temperature field data, a cellular automaton model is constructed, and grids are divided; initializing state variables such as component concentration and solid-phase fraction; coupling temperature field data, solving an optimized solute diffusion and redistribution equation to obtain a concentration field, updating a solid phase fraction according to local supercooling drive, and marking grain growth; counting a solid-phase fraction, and updating a solid-phase position; and judging whether the temperature of the cladding layer is lower than the solidus temperature and the solid fraction reaches a complete solidification threshold value or not, and if yes, outputting weld microstructure and target element concentration data. According to the method, the evolution law of the welding macroscopic temperature field and the structure and solute concentration field can be effectively predicted, experiments are replaced with numerical simulation, the cost is reduced, the technical blank is filled up, and reliable support is provided for precise regulation and control of the nickel-based high-temperature alloy laser welding process.