389 results about "Thermal circuit" patented technology

The invention relates to a fused salt heat storage system based on heat energy grading matching. The system comprises a first-stage heat exchange unit, a second-stage heat exchange unit, a third-stage heat exchange unit and a mixing unit, and the first-stage heat exchange unit comprises a first-stage fused salt heat storage loop and a first-stage heat exchange adjusting valve and is used for absorbing and storing high-grade heat of exhaust gas of an exhaust pipeline of a boiler furnace; the second-stage heat exchange unit comprises a second-stage fused salt heat storage loop and a second-stage heat exchange regulating valve and is used for absorbing and storing high-grade heat of main steam extraction of a main steam extraction pipeline of a high-pressure cylinder of the steam turbine; the third-stage heat exchange unit comprises a third-stage fused salt heat storage loop and a third-stage heat exchange regulating valve and is used for absorbing and storing low-grade heat of air exhaust of an intermediate-pressure cylinder of an air exhaust pipeline of the intermediate-pressure cylinder of the steam turbine; the mixing unit mixes the three kinds of exhaust heat and outputs working medium fluid meeting the target temperature so as to adapt to different preset operation working conditions of the thermal power generating unit. Therefore, heat energy can be stored and released in a gradient mode through the system, wide-temperature-range efficient utilization is achieved, and the flexibility and energy efficiency of the thermal power generating unit are improved.

The embodiment of the invention discloses a transformer winding overheating fault diagnosis method, and relates to the technical field of power equipment state monitoring, and the method comprises the steps: building a temperature field model of a target transformer under a normal working condition and a plurality of preset winding overheating fault working conditions through a finite element simulation method, and obtaining a temperature field model of the target transformer based on a simulation result; calculating to obtain a group of fault temperature rise critical values corresponding to the positions of the winding sections; when the transformer runs on line, actual measurement temperature rise data of a plurality of positions on the surface of a box body of the transformer are obtained, and the actual measurement temperature rise data are compared with a fault temperature rise critical value so as to locate a winding section where an overheating fault occurs; for the fault section, solving an actual overheating temperature rise value of the fault section through an inversion calculation method by utilizing a preset transformer equivalent thermal circuit model and combining the actually measured top layer oil temperature and bottom layer oil temperature data; high-precision simulation is arranged offline, an efficient algorithm is used online, the diagnosis precision and efficiency are both considered, the accuracy is high, and the practicability is high.

The invention belongs to the technical field of power distribution automation of a power system, and particularly relates to a self-adaptive load control method and system for an intelligent cable branch box, and the method comprises the steps: collecting and preprocessing the current data of a branch loop and the temperature data of a cable joint in real time, obtaining a data confidence factor, and extracting a current change rate and a temperature rise rate; obtaining a load prediction value in a future set time period through a load trend prediction model; calculating the residual heat tolerance time for reaching the limit tolerance temperature; calculating an output load control adjustment coefficient based on the adaptive load control decision model and a particle swarm optimization algorithm; and judging a current state interval according to the load control adjustment coefficient, and controlling an execution end to execute a grading response strategy of through-flow maintenance, short-time overload monitoring and early warning and breaking current limiting in combination with the residual heat tolerance time. According to the method, the residual heat tolerance time is calculated in combination with load prediction and a transient thermal circuit model, and hierarchical response of load control is realized through a particle swarm optimized radial basis function neural network decision.

The invention relates to the technical field of power equipment monitoring and fault diagnosis, and discloses a power transformer fault early warning method and system. The method comprises the following steps: acquiring a load current sequence, an environment temperature sequence and a top oil temperature sequence of a transformer; calculating an initial actually measured temperature rise based on the top oil temperature and the environment temperature, and determining thermal response lag time through cross-correlation analysis; carrying out translation correction on the load current according to the lag time, and constructing a time-aligned excitation input set and an actually measured temperature rise sequence based on a common effective time window; substituting the excitation input set into a thermal circuit model based on a thermal balance differential equation to calculate a theoretical reference temperature rise, calculating a residual error in combination with an actually measured temperature rise sequence, performing moving average filtering, and constructing a fault feature vector; and inputting the fault feature vector into a fault diagnosis classification model to determine a fault type and severity, and generating a grading early warning instruction according to the fault type and severity. According to the method, thermal hysteresis interference can be eliminated, and accurate quantitative early warning of the latent thermal fault of the transformer under the dynamic working condition is realized.

The invention provides a transformer heavy overload evaluation analysis method and device, and the method comprises the steps: building a thermal circuit model of load-induced heat point temperature rise of a transformer according to the heating power, equivalent heat capacity and equivalent heat resistance of an internal winding of the transformer, and load-induced heat top oil temperature rise of the transformer; converting a heat flow source in the heat circuit model into a hot pressure source based on the Thevenin theorem, constructing an equivalent heat circuit model of the heat circuit model, and calculating load heating hot spot temperature rise of the transformer under different load rates according to the equivalent heat circuit model; according to the historical environment heating temperatures of the transformer under different load rates, obtaining predicted environment heating temperatures of the transformer under different load rates; and obtaining winding hot-spot temperatures of the transformer under different load rates according to the load heating hot-spot temperature rise and the predicted environment heating temperature of the transformer under the same load rate. According to the invention, the thermal state sensing precision of the transformer under the dynamic load is improved.

A thermal management system and method, a computer device, a vehicle and a storage medium. A four-way valve (17) can regulate the connection relationship between an electric drive circuit and a battery circuit, and a three-way valve can regulate the connection relationship between a heating apparatus, a heating circuit and the battery circuit. Therefore, said system can meet the requirement of the heating circuit selectively heating a passenger compartment and a battery (31) and the requirement of the electric drive circuit using electric drive waste heat to selectively heat the battery and the passenger compartment; and for some scenarios of vehicle use at year-round high temperatures, no heat pump system is required, thus making designed valve parts and system piping simpler, reducing the cost and resource waste of the thermal management system, and lowering the complexity of piping control.

The invention discloses a laminated half-bridge power semiconductor module with a temperature sensor, and the module comprises a heat dissipation bottom plate, an insulating ceramic layer, a functional metal layer which forms a circuit pattern, and a low-side power semiconductor chip and a high-side power semiconductor chip which are disposed on the functional metal layer, the low-side power semiconductor chip and the high-side power semiconductor chip are connected in an up-and-down stacking mode through a middle metal layer and are electrically connected with the power terminal, the first temperature sensor is fixedly arranged on the upper surface of the ceramic material to jointly form a sensing composite body, and the first temperature sensor is electrically connected with the high-side power semiconductor chip. The temperature sensor has the beneficial effects that the temperature sensor is directly and fixedly arranged on the key heat flow path metal conductor by taking the high-thermal-conductivity and insulating ceramic material as a carrier, so that a thermal circuit is effectively shortened, the response speed is increased, the measurement precision is improved, the junction temperature is truly reflected, the junction temperature of the chip is rapidly and accurately monitored, and the high-voltage insulation safety is ensured.

To provide a thermal circuit model generation device, a state monitoring device, a thermal circuit model generation method, and a program capable of suppressing the number of components of a temperature measurement unit.SOLUTION: A thermal circuit model generation device according to an embodiment of the present invention is a device that generates thermal circuit information of an object that inputs and outputs a current, and includes a region generation unit and a thermal resistance generation unit. The area generation part generates at least a first calculation area and a second calculation area along a first axis of a corresponding area corresponding to the object. The thermal resistance generation unit generates, in a first calculation region, a first thermal resistance in a first axis direction according to a first heat transfer surface orthogonal to a first axis and a first heat transfer distance in the first axis direction based on a main propagation component of a heat flow propagating in a direction different from the first axis and a second axis orthogonal to the first axis.SELECTED DRAWING: Figure 4

The application relates to the technical field of solar power generation, in particular to a combined cooling, heating and power (CCHP) system. A first heat storage circuit is used for collecting solar energy and storing the solar energy as low-temperature heat energy; a second heat storage circuit is coupled with the first heat storage circuit and is used for converting the low-temperature heat energy into high-temperature heat energy and storing the high-temperature heat energy; a user heat circuit is coupled with the first heat storage circuit and / or the second heat storage circuit and is used for transmitting a heat source to a user heat end; a user cold circuit is coupled with the first heat storage circuit and / or the second heat storage circuit and is used for generating a cold source and transmitting the cold source to a user cold end; and a power generation circuit is coupled with the second heat storage circuit and is used for converting the high-temperature heat energy into electric energy. Through the synergistic integration of multi-stage energy storage, hierarchical heat coupling and multi-end energy output, the application realizes efficient and full-grade cascade utilization of solar energy, significantly reduces heat loss, meets the multiple demands of users for power generation, heat supply and refrigeration, greatly improves the overall energy utilization efficiency of the system and avoids resource waste.

The invention provides refrigeration equipment, a control method and a control device, and relates to the technical field of refrigeration control, and the control method is suitable for a refrigeration system with double refrigeration circuits and a cooling water heat exchange circuit. The refrigeration equipment comprises a first refrigeration loop, a second refrigeration loop and a first heat exchange loop. Based on the environment load signal, the start and stop states of the first compressor and the second compressor are dynamically controlled, and energy efficiency scheduling under different loads is achieved; the air suction and exhaust parameters and the liquid outlet temperature of each refrigerating circuit are collected, the superheat degree is calculated, the opening degree of an electronic expansion valve is adjusted, and stable liquid supply of an evaporator is ensured; meanwhile, the opening degree of an electric adjusting valve of each plate heat exchanger is controlled according to the exhaust temperature or pressure, and the condensate water flow is adjusted; and condensation control is further optimized in combination with liquid outlet temperature feedback. According to the method, efficient operation and condensation decoupling of the system under different load working conditions can be achieved, and the overall refrigeration performance and stability are improved.

The invention relates to the technical field of commercial spaceflight, in particular to a self-repairing liquid metal heat pipe for commercial spaceflight, which comprises a polyether-ether-ketone composite pipe, gallium bismuth zinc liquid gold, a micro-nano repairing film, a main hot runner, a pressure detector, a standby hot runner and an emergency plugging valve, and the main hot runner is an axial through channel in the polyether-ether-ketone composite pipe, and the standby hot runners are annularly and circumferentially arrayed along the inner wall of the main hot runner. Compared with heat conduction in the prior art, medium leakage is stopped through cooperative plugging in a damaged scene, so that the heat conduction efficiency is improved, and the service life of the heat exchanger is prolonged. And meanwhile, the detector is in signal linkage with the plugging valve, a heat transfer loop is rapidly switched in the case of serious damage, the continuous and stable thermal control function is achieved, and therefore the on-orbit operation life of a spacecraft is further prolonged.

The application discloses a heat recovery system, method, device, equipment and medium, comprising: obtaining a target operating state of an air conditioning loop; when the target operating state is a refrigeration state, controlling a refrigeration sub-loop and a second sub-loop to operate; when the target operating state is a heating state, controlling a heating sub-loop and a first sub-loop to operate, or controlling the heating sub-loop, the first sub-loop and the second sub-loop to operate. The application realizes heat exchange between the air conditioning loop and the heat dissipation loop of the vehicle system through a water-cooled condenser, recycles heat of the vehicle system in the heating state, thereby reducing energy consumption of the air conditioning equipment using the vehicle power supply, improving the heat recovery rate of the vehicle system, that is, improving the utilization rate of heat generated by the vehicle system during operation, realizing effective utilization of the vehicle waste heat, improving the heating comfort of the passenger cabin, reducing the vehicle power consumption, and thereby improving the cruising range of the automobile at low temperature.

The invention relates to the technical field of automobile thermal management, and discloses a dynamic thermal management control method, device and equipment for an extended-range automobile and a medium, and the method comprises the steps that the temperature of a warm core side water outlet is determined according to the temperature of a warm core side water inlet of a cabin warm core loop, the flow of warm core cooling liquid and a cabin thermal load; the battery side water outlet temperature is determined according to the battery side water inlet temperature, the battery cooling liquid flow and the battery thermal load of the battery heat exchange loop; according to the warm core side water outlet temperature, the battery side water outlet temperature, the warm core cooling liquid flow and the battery cooling liquid flow, a mixed water temperature calculation value of the junction is determined; and the engine water outlet temperature of the engine cooling loop is obtained, the mixed water temperature calculation value is compared with the engine water outlet temperature, and heat management control is carried out according to the comparison result. According to the invention, sensorless multi-loop thermal management cooperative control is realized, the hardware cost and the failure rate are greatly reduced, and the energy utilization rate is effectively improved.

The application discloses a kind of conductor operation risk assessment method, system and its terminal equipment, belong to conductor state assessment technical field, this method is: based on real-time operating tension and conductor structure parameter acquisition interlayer comprehensive contact thermal resistance set;Based on real-time line current, conductor structure parameter and preset skin effect coefficient calculation unit length heat generation rate, based on unit length heat generation rate and interlayer comprehensive contact thermal resistance set constructs radial temperature distribution thermal circuit model;Conductor surface layer temperature and ambient temperature are input in radial temperature distribution thermal circuit model to obtain real-time temperature;Based on real-time temperature and temperature-mechanical property degradation model obtains tensile strength, to based on tensile strength and conductor structure parameter calculation limit bearing capacity;Based on real-time operating tension to obtain actual share load and calculate safety margin, to based on safety margin and preset safety threshold value output the risk assessment result of to-be-measured conductor, realize to the precise dynamic evaluation of each layer failure risk in conductor internal.

The invention provides a cold and heat double-storage and double-supply system which comprises an energy conversion unit, an energy storage unit and an energy release unit. The energy conversion unit comprises an ice slurry heat pump and an ice making main machine; the energy storage unit comprises an energy storage tank; the energy releasing unit comprises a heat exchanger; the cold end of the ice slurry heat pump is connected with the cold carrying side of the ice-making main machine through a first pipeline to form a circulation loop; the energy charging side of the energy storage tank is connected with the water side of the ice-making main machine through a second pipeline to form a cold storage loop; the energy charging side of the energy storage tank is connected with the hot end of the ice slurry heat pump through a third pipeline to form a heat storage loop; the energy release side of the energy storage tank is connected with one side of the heat exchanger through a fourth pipeline to form an energy release loop; the other side of the heat exchanger is used for being connected with a user side so as to achieve cooling or heating. The energy conversion unit is configured to provide cold energy for the ice-making main machine by the ice slurry heat pump when the energy storage tank stores cold; and when the energy storage tank stores heat, the ice making main machine provides heat for the ice slurry heat pump.

The pressurization system comprises a liquid outlet pipeline, a vaporizer, a buffer tank and a heat exchange loop, the liquid outlet pipeline is communicated to a low-temperature container, the vaporizer and the buffer tank are both communicated to the liquid outlet pipeline, and the buffer tank is located on the downstream of the vaporizer, so that the buffer tank can store gaseous media heated and vaporized by the vaporizer. The heat exchange loop is communicated to the buffer tank and is communicated with a circulating pump and a heat exchange device, the circulating pump can drive a gaseous medium in the buffer tank to flow along the heat exchange loop, the heat exchange device is connected to the low-temperature container, and the gaseous medium can conduct heat exchange on the low-temperature container through the heat exchange device; the heat carried by the gaseous medium is transferred into the low-temperature container, and the liquid medium in the low-temperature container absorbs heat and is vaporized, so that the volume of the medium in the low-temperature container is increased, the pressure in the low-temperature container is improved, the low-temperature container can be quickly pressurized when being at a low liquid level, and liquid supply or gas supply of the low-temperature container is facilitated.

The invention discloses an ORC power generation and three-mode heat storage system driven by hot dry rock terrestrial heat, and relates to the technical field of hot dry rock resource exploitation. The system comprises an organic Rankine cycle loop, a heat storage loop and a waste heat loop. The Rankine cycle loop comprises a generator, a turbo expander, a condenser and an evaporator, the turbo expander adopts a CO2 working medium as a circulating hot working medium, and the heat storage loop comprises a cold tank, a heat exchanger and a hot tank which are connected in sequence. According to the heat storage loop, the heat storage temperature range (150-300 DEG C) is highly matched with the temperature range (150-200 DEG C) of the hot dry rock, the performance of the organic Rankine cycle loop adopting the CO2 working medium is further improved compared with that of a traditional working medium, the waste heat loop is additionally arranged, waste heat of the condenser is used for heating low-temperature water generated by the heat exchanger through the waste heat loop, and the heat storage temperature range (150-300 DEG C) is greatly improved. The water temperature injected into the hot dry rock is increased, the energy utilization rate is increased, and the energy efficiency is improved.

This utility model discloses a heating system for a cable-laying vessel with waste heat recovery, belonging to the field of cable-laying vessels. The heating system includes a diesel engine cylinder liner, a hot water boiler system, a seawater cooling system, a first heat exchanger, and a second heat exchanger. The first heat exchanger's first heat exchange circuit is connected to the diesel engine cylinder liner, its second heat exchange circuit is connected to the hot water boiler system, its third heat exchange circuit is connected to the diesel engine cylinder liner, and its fourth heat exchange circuit is connected to the seawater cooling system. This heating system for a cable-laying vessel with waste heat recovery has a waste heat recovery function and can use the recovered heat to heat the cabins or preheat the cooling water in the seawater cooling system.

The invention discloses a cold and heat demand coupling type waste heat recovery system, a control method and a storage medium. The cold and heat demand coupling type waste heat recovery system comprises a plurality of heat supply loops, a plurality of cold supply loops and a controller. A first temperature sensor is arranged on a water outlet pipe of the leaf storage room to obtain a first temperature; a third temperature sensor is arranged on a water outlet pipe at the heat absorption end of the heat exchanger to obtain a third temperature; the controller controls opening and closing of a heat supply loop and a cold supply loop according to the first temperature and the third temperature; the water source heat pump supplies heat to the tobacco leaf storage room and supplies cold to the tobacco shred storage room at the same time, cold and heat complementation of the tobacco leaf storage room and the tobacco shred storage room is achieved, the water inlet temperature of the low-temperature side of the water source heat pump is improved through the heat exchanger, and therefore the system energy efficiency is improved; the air source heat pump is arranged, relative cold and heat sources are supplemented in time when the cold and heat requirements of the system are not equal, and stable operation of the system is guaranteed; by arranging various heat supply loops and cold supply loops, heat supply in winter and heat supply and cold supply in summer can be met.

Provided in the present application are an electric vehicle thermal management system and a control method therefor. The electric vehicle thermal management system comprises a heat pump loop, a waste heat loop and a heat storage bypass; the heat pump loop is successively provided with an evaporator, a compressor, a condenser and a throttle valve in the flow direction of a refrigerant; the waste heat loop is successively provided with a first waste heat pipe, a heat source component, a second waste heat pipe and the evaporator in the flow direction of a cooling liquid; the heat storage bypass is connected in parallel to a branch section of the second waste heat pipe, and the heat storage bypass is provided with a heat storage device. In the electric vehicle thermal management system provided by the present application, a portion of heat released by the heat source component during operation can be transferred to the evaporator by means of the second waste heat pipe, and another portion of the heat can be released by means of the heat storage device in the heat storage bypass, so as to provide heat for vaporization of the refrigerant in the evaporator, thereby ensuring normal operation of the heat pump loop. The present application does not require starting a PTC backup heat source, and thus does not consume additional electric energy of a power battery, thus reducing energy consumption of electric vehicles.

The utility model discloses a temperature control system and an energy storage device, relates to the equipment technical field, the temperature control system comprises a liquid cooling main circuit, a liquid cooling branch circuit, a heat exchange loop, a valve group and a pump group, the liquid cooling main circuit is used for circulating heat exchange fluid capable of realizing heat exchange with a heat management object, the liquid cooling branch circuit is used for reducing the temperature of the heat exchange fluid in the liquid cooling main circuit, and the valve group is used for controlling the pump group. The heat exchange loop dissipates heat to the outside through the compression refrigeration set and exchanges heat with the liquid cooling main path through the heat exchange device, the valve set is used for adjusting the proportion of heat exchange fluid between the liquid cooling main path and the liquid cooling branch path, and the pump set is used for driving the heat exchange fluid in the liquid cooling main path to flow. The temperature of fluid in the liquid cooling main circuit is reduced, the heat exchange loop dissipates heat to the outside through the compression refrigeration set and exchanges heat with the liquid cooling main circuit through the heat exchange device, and by means of the mode that the two kinds of heat exchange are mixed for operation, the auxiliary power consumption of the temperature control system can be greatly reduced, and the efficiency of the temperature control system is improved.

Vehicle (1), comprising: - a radome device (2) for a radar sensor (3) of the vehicle (1), comprising: ▪ a radome (14) with a central area (13) which is transparent to electromagnetic radiation from the radar sensor (3), and ▪ a heating element (16) for temperature control of the central area (13) of the radome (14), wherein a heating power can be introduced into the central area (13) of the radome (14) by means of electrical energy, wherein: ▪ the central area (13) has a preferred deposition area (12) within which precipitation (10) from an environment (4) of the vehicle (1) preferentially accumulates when the radome device (2) is arranged as intended on the vehicle (1), ▪ a total heating power different from the heating power can be introduced into the preferred deposition area (12), and ▪ the heating element (16) has at least a first heating circuit (17) and a second heating circuit (18) haswherein the central area (13) with / without the preferred deposit area (12) can be temperature-controlled by means of the first heating circuit (17) and exclusively the preferred deposit area (12) can be temperature-controlled by means of the second heating circuit (18),- a computing device (5) which is configured to: ▪ receive environmental data describing the environment (4) of the vehicle (1) and / or at least the central area (13) of the radome (14), ▪ detect precipitation (10) and / or a deposit (9) of precipitation (10) within the central area (13) of the radome (14) based on the environmental data, and ▪ output a first heating signal to the heating element (16) for temperature-controlling the radome (14) by means of the first heating circuit (17) depending on the detected precipitation (10) and / or the detected deposit (9) of precipitation (10).

The invention relates to the technical field of lead-bismuth reactors, and particularly discloses a liquid lead-bismuth alloy thermal stripe oscillation experiment device and method. The device comprises an experiment loop, a gas protection loop, a data acquisition device and an integrated control module. According to the experimental loop, a magnetic pump is used for driving lead-bismuth fluid and an air cooler to realize cooling through a cold and hot double-loop structure, lead-bismuth jet flow with temperature difference is formed, and the lead-bismuth jet flow is mixed in a three-inlet experimental section to simulate a hot stripe oscillation phenomenon. The method comprises the steps of gas replacement, preheating, loop filling, temperature and flow rate regulation and control, data acquisition and the like. The device can truly simulate a lead bismuth alloy thermal stripe oscillation process, effectively prevents high-temperature oxidation, has a modular experimental section structure, can research thermal stress responses under different structures, and provides reliable experimental data for reactor safety design.

The invention discloses an ultrahigh-temperature compressed air energy storage system and method, and relates to the technical field of heat energy engineering. The system comprises a compression energy storage subsystem, an expansion power generation subsystem, a heat regenerator and a fused salt heat storage loop. The compression energy storage subsystem comprises a compressor unit and a heat storage heat exchanger unit, and the expansion power generation subsystem comprises a heat release heat exchanger unit and an expansion unit which alternately operate in time; the heat storage heat exchanger set, the heat regenerator and the compressor set which are used for storing compression heat in the compression process, and the heat release heat exchanger set, the heat regenerator and the expansion set which are used for releasing heat to heat air in the expansion process can be integrated into the same physical equipment set. According to the invention, ultrahigh-temperature compression can be realized, a heat storage temperature area is perfectly matched with binary nitrate solar salt, a low-temperature heat storage system is omitted, the problems of low energy storage efficiency, complex system and high cost of existing compressed air are solved, step-type improvement of efficiency is realized, the system is simplified, and the cost is obviously reduced.

The present application relates to a system (100) for producing domestic hot water and heat for central heating, the system (100) comprising: a heat generator (1) for obtaining heat from a heat source, the heat generator (1) having a generator outlet port (1.1) and a generator return port (1.2); a central heating circuit (3) having a heating supply port (3.1) and a heating return port (3.2); a tank (11) having a top and a bottom, the tank (11) containing a thermal storage medium (12); a first tapping coil (7) immersed in the thermal storage medium (12) in the bottom of the tank (11); a second tapping coil (6) immersed in the thermal storage medium (12) in the top of the tank (11); and means (8, 9, 13, 14) for warming domestic hot water; wherein the heat generator (1), the second tapping coil (6), the central heating circuit (3) and the first tapping coil (7) are fluidly connected in series so as to allow fluid to flow from the heat generator (1) back to the heat generator (1) via at least one of the second tapping coil (6), the central heating circuit (3) and the first tapping coil(7); the system (100) further comprising: a first three-way valve (2) fluidly connected to the generator outlet port (1.1), the second tapping coil (6) and the heating supply port (3.1), and configured to selectively bypass or flow fluid through the second tapping coil (6); a second three-way valve (4) fluidly connected to the heating supply port (3.1) and the heating return port (3.2), and configured to selectively bypass or flow fluid through the central heating circuit (3); and a third three-way valve (5) fluidly connected to the first tapping coil (7) and the generator return port (1.2), and configured to selectively bypass or flow fluid through the first tapping coil (7).

This application discloses a server heat dissipation device and a server heat dissipation control method. The server heat dissipation device includes a heat dissipation circuit, a heat exchange circuit for exchanging heat with the heat dissipation circuit, a cooling component, and a heat exchange box. The heat dissipation circuit has a first heat dissipation section, a first heat exchange section, and a cooling element connected sequentially along the flow direction of a first cooling medium. The cooling element is used for heat exchange with the load. The heat exchange circuit includes a compressor, a second heat dissipation section, and a second heat exchange section connected sequentially along the flow direction of a second cooling medium. Both the first heat dissipation section and the second heat dissipation section are located at the cooling component. The cooling component dissipates heat from the first cooling medium located in the first heat dissipation section after heat exchange with the load, and dissipates heat from the second cooling medium located in the second heat dissipation section after compression by the compressor. Both the first heat exchange section and the second heat exchange section are located in the heat exchange box and cooperate in heat exchange within the heat exchange box, solving the technical problem of poor flexibility in server heat dissipation devices in related technologies.

The present application belongs to the technical field of indoor temperature control, and particularly relates to a cooling fan, which comprises a machine body, a heat exchange loop and a fan arranged in the machine body, the heat exchange loop comprising an insulation box, a pump body and a water discharge heat exchanger; at least two cold conducting plates are arranged in the insulation box, and a cold source is arranged between two adjacent cold conducting plates for cooling the cold conducting plates; a flow channel is arranged in the cold conducting plate for filling with a cold carrier; the pump body is connected with the cold conducting plate for driving the cold carrier to the water discharge heat exchanger; the water discharge heat exchanger is arranged at an air outlet of the fan for cooling the air blown out through the air outlet. The cooling fan provided by the present application has small overall volume, high heat exchange efficiency and good refrigeration effect, and can effectively realize local area cooling and save energy.

The application discloses a battery pack heating pre-charging control circuit and a control method, and relates to the field of battery management systems.The circuit comprises a battery pack, a heating film, a discharging switch, a first heating switch, a second heating switch, a pre-charging switch, a load / charger and a controller.When the pre-charging is started, the first heating switch and the pre-charging switch are closed to turn on the pre-charging circuit, and an improved pre-charging circuit is realized.When the pre-charging process is finished, the discharging switch is normally closed.When the heating is started, the first heating switch and the second heating switch are closed to turn on the heating circuit, and the heating circuit is realized.The pre-charging circuit mainly comprises the heating film and the pre-charging switch, and the role of the pre-charging resistor is replaced by the heating film.Because the resistance value of the heating film is smaller than that of the general pre-charging resistor, the energy loss is reduced, the heat generation is lowered, and the reliability of the battery pack system is improved.

The invention discloses a liquid hydrogen heat exchange experimental device, which relates to the field of aero-engines and comprises a liquid hydrogen loop, a nitrogen heating loop, a test section, a measurement and control module and a safety protection module, wherein the liquid hydrogen loop is used for providing supercritical hydrogen meeting a preset working condition; the nitrogen heating loop is used for heating nitrogen to a target working condition temperature and providing a convection heating environment for the test section; the test section comprises a straight pipe type sealing sleeve, supercritical hydrogen circulates in an inner pipe of the straight pipe type sealing sleeve, and high-temperature nitrogen circulates in an outer pipe of the straight pipe type sealing sleeve; the measurement and control module comprises a controller, and the controller and the heater are configured to dynamically adjust the flow of hydrogen and nitrogen and the heating power of nitrogen so as to simulate transient working conditions; the safety protection module is used for conducting steady state judgment and safety monitoring according to data collected by the liquid hydrogen side sensor and the nitrogen side sensor. According to the invention, the convective heat transfer performance of supercritical hydrogen can be accurately measured under low-temperature, high-pressure and safe conditions, and reliable experimental support is provided for thermal management of a hydrogen fuel aero-engine.