432 results about "Thermal techniques" patented technology

The invention belongs to the technical field of intelligent heat supply, and provides a green power consumption heat storage and release matching control method and system based on a water heat storage boiler, and the method comprises the steps: firstly obtaining a heat load prediction sequence and an electric power spot market price prediction sequence of a heat supply system; secondly, regarding the heat supply network as a graph structure composed of nodes and pipelines, and establishing a pipe network dynamic model for describing the hydraulic and thermal characteristics of the heat supply pipe network; and finally, with the purpose of minimizing the comprehensive operation cost of the heat supply system in the whole scheduling period, and with the whole network heat balance, heat source operation, centralized heat storage device operation, heat supply network safety and user comfort as constraint conditions, solving to obtain a source network load storage cooperative control strategy. The purpose of integrated collaborative optimization of the heat source, the energy storage, the pipe network and the load is achieved, a scheduling strategy with better economical efficiency can be generated, and the problems that the absorption capacity is insufficient, and the overall operation economical efficiency of the system is not high are solved.

The invention relates to the technical field of geothermal energy utilization and underground heat exchange, in particular to a medium-deep layer buried pipe heat exchanger seepage thermal response rapid prediction method based on artificial intelligence, and the method comprises the steps: obtaining temperature field snapshot data of a medium-deep layer buried pipe heat exchanger system under different operation conditions; performing orthogonal decomposition on the temperature field snapshot data to obtain main modal characteristics and corresponding amplitudes; the parameters of all the operation conditions serve as input variables, all the main modal features and the corresponding amplitudes serve as output variables, a BP neural network is trained, and an artificial intelligence agent model is constructed; and obtaining parameters of a target operation condition, inputting the parameters into the artificial intelligence agent model, outputting the amplitude of each main mode under the target operation condition, reconstructing a temperature field, and completing rapid prediction of the seepage thermal response of the medium-deep layer buried pipe heat exchanger under the target operation condition. According to the method, the temperature field distribution of the DBHE system under the action of underground water seepage can be quickly predicted.

The invention belongs to the field of phase change heat storage, and discloses a phase change heat exchange fin parameter optimization method and a related device.According to the method, a three-dimensional parameterized model of a tree-shaped fractal fin containing the length ratio, the width fractal dimension and the fin number is established, representative parameter sample points are efficiently generated through Box-Behnken experimental design, and the representative parameter sample points are optimized; and a liquid phase rate and a total heat storage capacity response value are obtained by combining numerical simulation of phase change heat transfer, and multi-target parameter global optimization is realized based on a second-order polynomial regression model. By the adoption of the method, optimization efficiency and precision are remarkably improved, on the premise that a large number of repeated experiments or simulations are not needed, the optimal fin structure parameters capable of cooperatively strengthening heat conduction, promoting melting of the phase-change materials and maximizing the heat storage capacity are rapidly obtained, and a reliable design basis is provided for engineering application of the fractal fin strengthening phase-change heat storage technology.

The invention relates to the technical field of intelligent heat supply, and discloses a load prediction energy-saving regulation and control method for secondary network heat supply. Extreme weather is identified through the multi-source meteorological data, and graded early warning signals are generated; collecting and processing data flow of a heat supply pipe network and an indoor sensor; fusing the data flow and the early warning signal, and generating a thermal load prediction value subjected to physical constraint and dynamic compensation by adopting a hybrid prediction model; based on the early warning level and the predicted value, a multi-objective optimization problem is solved in a rolling mode through model prediction control, and a water supply temperature and water pump frequency setting curve is generated; and finally, after instruction smoothing and safety verification, an execution mechanism is driven to complete accurate regulation and control. According to the invention, by constructing a sensing, predicting, optimizing and executing full-link intelligent regulation and control system, the industrial problem that the rapid mutability of extreme weather is not matched with the slow dynamic response of the system is solved, and the regulation and control quality and the energy efficiency level of the heat supply system are remarkably improved.

The invention discloses a heat supply network source side renewable energy source regulation and control method and system, a medium and a product, and relates to the technical field of renewable energy source integration and heat supply. According to the method, the regulation and control system collects the real-time water return temperature of the primary side main water return pipe, the target water supply temperature of the primary side main water supply pipe and the outlet water temperature of the renewable energy source branch to determine the physical topological structure of the renewable energy source branch connected to the source side of the urban heat supply network, and correspondingly adjusts the valve opening degree of the multi-way valve set to be connected with the flow path. According to the self-adaptive heat supply network source side renewable energy source regulation and control method, the access mode of the renewable energy source on the urban heat supply network source side can be flexibly adjusted according to the output change of the renewable energy source, invalid circulation is avoided while the heat exchange effect is guaranteed, and therefore the utilization efficiency of the renewable energy source is improved.

The invention relates to the technical field of circulating heat dissipation, in particular to a circulating heat dissipation system for a distribution box, and the system comprises a simulation unit which is used for constructing a thermal field; the acquisition unit is used for acquiring data; a processing unit to process the data; the analysis unit is used for analyzing whether the heat dissipation system meets the standard or not, determining a reason for the condition that the heat dissipation system does not meet the standard, and generating a corresponding instruction according to the reason; the adjusting unit is used for adjusting corresponding parameters according to the instruction, and the parameters comprise operation parameters and judgment parameters of the device; comprising a first heat dissipation device, a circulating heat dissipation device and a second heat dissipation device. The heat dissipation efficiency of the distribution box is effectively improved.

The invention discloses a heat supply unit deep peak regulation and heat supply optimization operation method based on multi-mode collaboration, and particularly relates to the technical field of thermal power generation and heat supply, and the method comprises the steps of S1, system modeling and parameter identification, S2, thermoelectric load prediction, S3, multi-objective optimization solution, S4, operation decision and feedback, and S5, data agent mapping acceleration. According to the method, the thermoelectric load is accurately predicted through mechanism and data dual-drive modeling, and based on the target of maximizing the economic benefits of the whole plant, the optimal cooperation scheme of multiple operation modes such as heat supply, power supply and deep peak regulation is dynamically solved by utilizing the multi-target optimization algorithm on the premise of ensuring the safety of the unit, so that the power supply efficiency is improved. Finally, production is guided through an online decision-making and closed-loop feedback system, and safe, economical and flexible operation of the unit under the working condition of deep peak regulation is achieved.

The invention provides a control method and device for a multi-heat-source heat supply system. The control method and device can be applied to the technical field of intelligent heat supply. The method comprises the following steps: performing nonlinear conversion on initial prediction characteristics obtained by performing gating processing on respective characteristic sequences of meteorological information and previous load information of a building to obtain load prediction information of a heat supply system, and performing fusion processing on node information, branch pipe information and respective constraint conditions in previous operation information of a heat supply pipe network to obtain load prediction information of the heat supply system; water and heat distribution information of the heat supply pipe network is obtained; on the basis of the load prediction information, the hydrothermal distribution information and a target function, start-stop combination information and load distribution information of the multiple heat supply devices in the target time window are determined, and the target function is determined by energy cost information, load fluctuation information of the heat supply devices and start-stop times; and converting the start-stop combination information and the load distribution information into a control instruction and sending the control instruction to execution equipment so as to carry out heat supply control on the heat supply system.

The invention discloses a hydrothermal coupling dynamic simulation method and system for sudden supply and demand change of a long-distance heat supply pipe network, and belongs to the technical field of central heating, and the technical scheme is as follows: obtaining topological structure parameters, elevation, pipeline structure parameters, thermal insulation layer structure parameters and environmental parameters of the heat supply pipe network; constructing a node incidence matrix, and setting a heat source parameter, a physical property parameter, an abrupt change working condition parameter and a space step length; initial hydraulic calculation is conducted, and flow of all pipe sections and pressure distribution of all nodes of the heat supply pipe network are obtained; time-marching calculation is carried out on a temperature field in the pipe network when supply and demand loads suddenly change, heat supply medium physical property parameters and a pipe network hydraulic state are synchronously updated in the temperature field calculation process, and hydraulic and thermal coupling dynamic simulation is achieved; and on the basis of coupling dynamic simulation, the heat storage or heat release process of the heat supply pipe network under the supply and demand load sudden change working condition is analyzed. The dynamic simulation method and system for the supply and demand sudden change hydrothermal coupling of the long-distance heat supply pipe network have the beneficial effect that the dynamic simulation method and system for the supply and demand sudden change hydrothermal coupling are provided.

The invention relates to the technical field of heat storage, in particular to a dynamic heat storage and supply regulation and control system and method based on energy efficiency optimization. According to the method, multi-source parameters such as the server load rate, the cooling return water temperature and the heat supply side return water temperature are subjected to collaborative modeling, so that instantaneous surplus heat is converted into schedulable heat storage, the heat supply side return water temperature difference is stabilized within a target interval by releasing the stored heat and adjusting the auxiliary heat source intervention proportion in a linkage mode, and the heat supply efficiency is improved. Room temperature deviation and energy efficiency deterioration caused by heat source fluctuation are avoided, and meanwhile closed-loop correction is conducted on heat charging and discharging power, the heat supply demand range and the index weight, so that the system gradually approaches the balance point of the lowest energy consumption and the optimal thermal comfort degree in long-term operation. Therefore, on the premise that the thermal comfort of a building group is guaranteed, the waste heat utilization rate is remarkably increased, the unit heat supply energy consumption is reduced, and the problems of insufficient heat supply stability and low waste heat utilization efficiency caused by asynchronous heat supply adjustment and waste heat recovery response are effectively solved.

The invention discloses an efficient heat dissipation energy-saving low-voltage control cabinet, and particularly relates to the technical field of control cabinets, the efficient heat dissipation energy-saving low-voltage control cabinet comprises a cabinet body, the wall portion of the cabinet body is sequentially provided with a protective layer, a phase change energy storage cavity and a diversion layer from outside to inside, the phase change energy storage cavity is filled with a composite phase change filling layer, and the bottom of the cabinet body is provided with a liquid cooling mechanism. According to the low-voltage control cabinet, a multi-layer cooperative heat dissipation system of liquid cooling enhanced heat exchange, phase change heat storage buffering and air cooling complementary heat dissipation is constructed, so that the technical problem that a single heat dissipation mode of a traditional low-voltage control cabinet is difficult to consider high-concentration heat absorption, low-concentration heat removal and thermal shock protection at the same time is solved; the three parts cooperatively cover high-concentration, low-concentration and peak-value full-scene thermal loads, it is ensured that the temperature in the cabinet is stabilized in a safety interval, the phase change heat storage technology and the liquid cooling closed-loop circulation are deeply coupled, a dynamic thermal management mechanism is constructed, and the energy consumption is reduced. The technical problem of sudden temperature rise caused by short-term high-load operation of electrical elements is effectively solved.

The invention relates to a liquid cooling heat dissipation system based on double-circulation dynamic switching and a control method, and belongs to the technical field of data center heat dissipation. The liquid cooling heat dissipation system comprises a server cabinet, an indoor CDU and an outdoor heat dissipation unit; the outdoor composite heat dissipation unit comprises a multi-channel condenser; the multi-channel condenser is provided with a plurality of independent flow channels, and the independent flow channels are opened or closed according to different temperatures. According to the invention, through innovative pipeline architecture and thermal path design, collaborative optimization of heat dissipation efficiency and space utilization rate of the high-density data cabinet is realized. The system adopts a graded tandem type heat transfer mode, chip-level high-heat-flux heat dissipation and cabinet-level low-grade waste heat recovery are integrated into the same circulating system, meanwhile, the heat dissipation requirements of different seasons and external temperatures are met through dynamic flow path switching of an outdoor module, the energy efficiency is remarkably improved, and equipment redundancy is reduced.

The invention relates to a configuration and operation optimization method for a park comprehensive energy system containing fused salt heat storage, and the method comprises the steps: constructing a unit equipment physical model which comprises energy equipment in the park comprehensive energy system and a fused salt heat storage system; according to the unit equipment physical model, a comprehensive energy system operation optimization mathematical model including a target function and constraint conditions is constructed based on a mathematical programming method; the comprehensive energy system operation optimization mathematical model is solved, and the optimized comprehensive energy system capacity configuration and the heat charging / discharging strategy of the fused salt heat storage system are obtained. Compared with the prior art, by integrating multiple energy forms such as electricity, gas and cold and utilizing the efficient heat storage and release capacity of the fused salt heat storage technology, the flexibility and the renewable energy consumption level of the system are remarkably improved, and the comprehensive energy system is promoted to develop towards the low-carbon and intelligent direction.

The invention discloses a thermal power plant boiler fly ash fluidized bed heat storage and release system and a heat storage and release method, and relates to the technical field of electric heat storage. The system comprises a heating fluidized bed, a fly ash heat storage tank and a fluidization heat release tank, the bottom and the top of the fly ash heat storage tank are connected with the bottoms and the tops of the heating fluidized bed and the fluidization heat release tank through hot air circulating pipes respectively, and circulating fans are arranged on the hot air circulating pipes; fluidized bed partition plates are arranged in the heating fluidized bed, the fly ash heat storage tank and the fluidization heat release tank; a water-cooled wall tube is arranged in the fluidization heat release tank, the lower end of the water-cooled wall tube is connected with a water supply and steam pocket downcomer, and the upper end of the water-cooled wall tube is connected with a steam pocket. The coal ash of the thermal power plant is directly used as a heat storage medium to construct a closed-loop heat storage and release process, the coal ash disposal problem is solved, the material cost of the system is reduced, meanwhile, the peak regulation requirement of the power grid is met, resource utilization of the coal ash of the thermal power plant is achieved, the material cost of the heat storage system is reduced, and an efficient heat storage solution is provided for peak regulation of the power grid.

The invention relates to the technical field of central heating, and discloses a primary network heat supply flow balance adjustment and primary pipe network resistance reduction system operation method, which comprises the following steps: accurately calculating the final target flow of each branch pipeline through a flow demand evaluation model integrating static physical parameters and dynamic operation parameters; and then, a two-stage strategy of coarse adjustment and fine adjustment is adopted, a specific cooperative operation principle is followed, and standardized operation is conducted on the adjusting valve, so that the actual flow accurately approaches the target flow. In order to solve the intractable problem that the flow still does not reach the standard after the adjusting valve is fully opened due to physical blockage, the method further comprises closed-loop monitoring and intelligent diagnosis, faults such as insufficient flow or low heat exchange efficiency can be automatically recognized, and a flow distribution model is fed back and optimized. Accurate distribution of heat supply flow is achieved, the problem of intractable blockage of a pipe network is effectively solved, and the operation efficiency and heat supply quality of a heat supply system are remarkably improved.

The invention discloses a multi-heat-source complementary combined heat supply method, which relates to the technical field of intelligent heat supply, and comprises the following steps: S1, constructing a distributed heat source management module: deploying a multi-element sensor to obtain heat source operation data, mastering a heat source rule through processing and analysis, regulating and controlling equipment according to a threshold value and early warning abnormity, S2, constructing an energy supply and demand matching algorithm, S3, constructing an intelligent scheduling platform, and S4, managing the intelligent scheduling platform. S4, establishing an energy storage and adjustment mechanism; S5, optimizing a heat supply pipe network and distribution; and S6, performing emergency guarantee plans and measures. By constructing a distributed heat source management module, an energy supply and demand matching algorithm and an intelligent scheduling platform, accurate monitoring and intelligent control of heat source equipment parameters, optimization of a heat supply strategy, integration of data and visual interaction are realized, the management efficiency and flexibility are improved, heat source abnormity is timely processed, heat load change is adapted, and the energy utilization rate is improved. And the equipment is remotely controlled, so that the stability of the heat supply system is comprehensively guaranteed, and unnecessary energy waste is reduced.

The present application relates to the technical fields of constant temperature heating, and discloses a constant temperature bath system for enriching gas and liquid phase, which comprises a waste gas circulating device, a constant temperature device and a control device, the waste gas circulating device is used for circulating waste gas into the constant temperature device to enrich heavy metals, and the control device is used for controlling the heating mode of the constant temperature device; a collection unit is used for collecting the real-time temperature of the waste gas and the target temperature of the constant temperature device to determine the heating mode; when the temperature difference is large, a processing unit is used for intermittent heating with high power, and the maximum power and the intermittent duration of the intermittent heating with high power are determined according to the heat loss; the real-time temperatures of several positions in the constant temperature solution are collected in real time, a temperature distribution model is established, and the average temperature of the constant temperature solution is obtained; and a judging unit is used for obtaining the temperature change rate according to the average temperature at the intermittent end time and the target temperature, and determining whether to adjust the intermittent duration. The present application improves the efficiency and precision of the enrichment of heavy metals in waste gas, and reduces manual intervention through intelligent temperature control and self-adaptive adjustment.

This invention provides a downhole heat exchanger, a downhole heat exchange system, and a downhole heat exchange process, relating to the field of downhole heat exchange technology. The invention includes: a heat exchange tube, the lower end of which is closed; a baffle extending axially along the tube is disposed inside the tube, dividing it into a first chamber and a second chamber, with the lower ends of the first and second chambers connected; the upper ends of the first and second chambers are respectively used for injecting and discharging circulating heat exchange medium; the heat exchange tube includes a heat-extracting section and a non-heat-extracting section arranged sequentially from bottom to top, corresponding to the hot water section and non-hot water section of the heat exchange well, respectively; the hot water section is located below the static water level after well completion. The invention reduces the volume ratio of the internal material of the downhole heat exchanger, increases the flow area of ​​the circulating heat exchange medium, and releases more space for the circulating heat exchange medium. Simultaneously, due to the increased internal volume, the circulating fluid velocity increases under the same pump pressure conditions, resulting in an increase in total heat extraction.

The present application belongs to the technical field of heat supply, and discloses a kind of middle-deep geothermal energy heat supply system, including well site system and plant station system;Production well of well site system is connected with hot water supply pipe by hot water supply branch pipe, and recharge well is connected with hot water return pipe by hot water return branch pipe, and hot water supply branch pipe and hot water return branch pipe are connected with first sedimentation tank;Plant station system includes two heat exchangers connected in series on geothermal pipe, and the heat exchanger is heat exchanged with municipal water return pipe and municipal water supply pipe;Hot water supply pipe and hot water return pipe are connected with one heat exchanger respectively;Municipal pipeline is connected with two heat exchangers respectively, wherein heat pump unit is connected between second heat exchanger and municipal pipeline, and the heat pump unit includes three heat pumps connected in series on medium pipe and municipal branch pipeline, and the plant station system further includes second sedimentation tank, and hot water return pipe and geothermal pipe are connected with second sedimentation tank.The present application has the technical effects of ensuring stable operation of the system and reducing the operating cost of the heat pump system.

The application discloses a non-contact molten salt heat storage and release integrated device with multiple heat sources and a use method, belongs to the field of molten salt heat storage technology, and comprises a heat exchange container, an automatic stirring structure driven by heat energy and a heat exchange pipeline, the heat exchange container is filled with a heat conducting medium and molten salt, and a temperature insulation plate divides the heat conducting medium and the molten salt into a first heat exchange area and a second heat exchange area; the automatic stirring structure is divided into two groups and is respectively arranged on the upper and lower plate surfaces of the temperature insulation plate, so as to respectively stir the molten salt in the first heat exchange area and the second heat exchange area; the heat exchange pipeline is embedded in the heat conducting medium and is arranged around the molten salt, and the two ends of the heat exchange pipeline are synchronously connected to supply waste heat of the molten salt heat storage or to supply heat of the molten salt heat release equipment. By using the device and the method, the heat energy of the heat conducting medium is converted into kinetic energy of the automatic stirring structure, real-time stirring without external power is realized, and the system heat exchange coefficient and the operation reliability are remarkably improved.

The invention discloses a control method of an environment conditioning system, the environment conditioning system and a storage medium, and relates to the technical field of heat supply, the environment conditioning system comprises gas equipment, a heat pump system and a secondary refrigerant circulation loop, and the secondary refrigerant circulation loop comprises end equipment. The fuel gas equipment and the heat pump system are arranged to adjust the temperature of a secondary refrigerant in the secondary refrigerant circulation loop. The control method of the environment adjusting system comprises the steps that the environment temperature is obtained; and the fuel gas equipment and / or the heat pump system are / is controlled to be started according to the environment temperature and the secondary refrigerant temperature of the secondary refrigerant circulation loop. The technical problem that due to the fact that the automation degree of combined heating of a heat pump system and gas equipment is low, energy consumption of combined heating is high or the heating effect is poor is solved.

The utility model discloses an auxiliary heating structure and a kiln, which belong to the technical field of kiln heating, the auxiliary heating structure comprises a furnace body and a furnace chamber arranged in the furnace body, the side wall of the furnace body is provided with an auxiliary heating device, the auxiliary heating device comprises a support member, a heating element and a diffusion chamber, the diffusion chamber is arranged on the support member, and the heating element is arranged in the furnace chamber. The diffusion cavity faces the furnace cavity, the heating element penetrates through the supporting piece to be adjustably connected into the diffusion cavity, heat sources on the two sides of the furnace body are supplemented, surrounding heating is formed in the furnace cavity, the heating uniformity is higher, and the quality of sintered battery materials is better.

The invention relates to the technical field of data center heat dissipation, and provides a waste heat recycling system and method for a liquid cooling source, and the system comprises a liquid cooling cabinet, a cooling capacity distribution unit, a water fluorine heat exchanger, a water tank, a compressor, an evaporative condenser, a first temperature sensor and a second temperature sensor. Wherein the water-fluorine heat exchanger is in fluid connection with the cooling capacity distribution unit through a first switch assembly, the compressor and the evaporative condenser are in fluid connection with the cooling capacity distribution unit through a second switch assembly, and the first switch assembly and the water-fluorine heat exchanger are started or stopped based on the water temperature in the water tank; the second switch assembly, the compressor and / or the evaporative condenser are started or stopped based on the water temperature in the water tank and the outdoor temperature. Through the configuration, the system fully cooperates with the state of the surrounding environment and the state of the waste heat recycling object to reduce the operation time of the compressor and the evaporative condenser as much as possible, and the PUE of the whole data center is improved.

This invention relates to the field of heat exchange technology, specifically providing a control method for a compressed air air conditioning system, aiming to solve the problems of low heat exchange efficiency and high overall energy consumption in existing compressed air air conditioning systems. To this end, the compressed air air conditioning system of this invention includes a recirculating cooler, a centrifuge, a first indirect evaporative cooler, a compression-expansion unit, a second indirect evaporative cooler, a bypass branch, and a refrigerant circulation loop. The recirculating cooler includes a first recirculating cooling pipe and a second recirculating cooling pipe. The bypass branch can directly introduce air cooled by the first indirect evaporative cooler into the room to improve cooling efficiency and reduce cooling energy consumption. The refrigerant circulation loop can selectively operate to achieve further cooling. The control method of this invention includes: acquiring the outdoor ambient temperature; and controlling the operation mode of the compressed air air conditioning system according to the outdoor ambient temperature to ensure that the compressed air air conditioning system always maintains a high-efficiency operating state, thereby effectively reducing energy consumption.

This invention provides a control method for a hybrid heating system, relating to the field of heating technology. The control method includes a main control stage: acquiring heating-related data for the target area and the hybrid heating system, and setting weights for energy consumption, CO2 emissions, and operating costs in the target area; constructing energy consumption models, CO2 emission models, and operating cost models for the hybrid heating system regarding heat sharing ratios and theoretical outer ring temperatures; constructing a comprehensive evaluation index function based on the energy consumption model, CO2 emission model, operating cost model, and weight settings; calculating the theoretical outer ring temperature that makes the comprehensive evaluation index function unaffected by the heat sharing ratio, with the goal of minimizing the comprehensive evaluation index function, and using this as the switching outer ring temperature; and controlling the operating states of the switching heat pump and boiler according to the switching outer ring temperature and the actual outer ring temperature. This control method has a high degree of precision in controlling the heat source utilization method.

The present application relates to the technical fields of electric heater preheating, and particularly relates to an electric heater preheating system and method, comprising an electric heater and a preheating device. The electric heater comprises a shell, an electric heating tube and a junction box. The preheating device comprises a hot air module, a control module, a pressure sensor, a temperature and humidity sensor and a switch valve. The hot air module comprises a fan, a heating element and a connecting air pipe. The connecting air pipe is connected to a first pipe opening, so that the hot air generated by the hot air module is input into the shell through the first pipe opening. A second pipe opening is used for discharging air. The pressure sensor and the temperature and humidity sensor are arranged at the second pipe opening to detect the pressure value, the temperature value and the humidity value. The switch valve is arranged at the second pipe opening to adjust the opening and / or the opening degree of the second pipe opening. In the present application, the preheating device is connected to the electric heater to form a preheating system in the shutdown state of the electric heater. The preheating system does not need to rely on the energy of the molten salt system, and uses non-internal circulation air to realize the preheating and moisture removal of the electric heater.

This invention relates to the field of refrigeration and heating technology, and discloses a heat pump system. The heat pump system includes a compressor, a first four-way valve, a shell-and-tube heat exchanger, an evaporator, a first pipeline, a second pipeline, and a control valve. The shell-and-tube heat exchanger has a first heat exchange flow path, a second heat exchange flow path, and a cooling water flow path. The first and second heat exchange flow paths exchange heat with the cooling water flow path within the shell-and-tube heat exchanger. The heat pump system can selectively connect the first and second pipelines via the first and / or second heat exchange flow paths through the control valve. Compared to existing technologies, the heat pump system of this invention can adjust the heat exchange area between the refrigerant in the first and second pipelines and the cooling medium within the shell-and-tube heat exchanger according to ambient temperature and user needs, thereby improving heat exchange efficiency and rationally controlling the energy consumption of the heat pump system.

The utility model discloses an evaporator, a heat management system and a vehicle, and relates to the technical field of heat exchange. The evaporator comprises a body and a plurality of refrigerant distribution structures, first heat exchange flow channels are formed between adjacent heat exchange plate sets of the body, and refrigerant flow channels are formed in the heat exchange plate sets. A first annular part of the refrigerant distribution structure is provided with a distribution cavity and a first refrigerant outlet, a refrigerant annular channel is formed between the first annular part and a second annular part, and the second annular part is provided with a second refrigerant outlet. Due to the fact that the first refrigerant outlet is located below the second refrigerant outlet, when the flow of the refrigerant is low, part of the liquid refrigerant is accumulated in the refrigerant annular channel and seals the first refrigerant outlet in a liquid mode, the resistance of the refrigerant passing through the first refrigerant outlet is increased, the refrigerant can flow to the first refrigerant outlet which is not sealed in the liquid mode, the uniformity of refrigerant distribution is improved, and the service life of the refrigerant is prolonged. The heat exchange efficiency of the evaporator is improved. When the flow of the refrigerant is high, the refrigerant in the refrigerant loop is in a gas-liquid mixed mist shape, no liquid seal exists at the first refrigerant outlet, and the influence on flowing of the refrigerant is small.

The application relates to the fields of material science and electronic heat dissipation technology, and discloses a high-thermal-conductivity low-interface-thermal-resistance heat dissipation powder and a preparation method thereof, which comprises the following steps: S1, mixing a base material and a reinforcing material, and then dissolving the mixture in a dissolving solution to form an initial suspension; S2, adding a functional additive to the initial suspension, and forming a functional initial material with a three-dimensional network structure through a sol-gel method; S3, depositing an interface modifier on the surface of the functional initial material to form a dense interface modification layer, and preparing a composite material; S4, calcining the composite material at high temperature in an inert atmosphere to obtain a heat dissipation material; and S5, cooling, grinding and screening the heat dissipation material to obtain the heat dissipation powder. The high-thermal-conductivity low-interface-thermal-resistance heat dissipation powder and the preparation method thereof have the advantages that through micro-nano double-scale structure design, micron alumina skeletons and nano reinforcing materials are embedded, and interface modification technology and functional additives are synergized, so that the heat dissipation powder has the advantages of high thermal conductivity, low interface thermal resistance, solution of traditional material agglomeration and heat conduction deficiency, and mechanical and thermal conductivity performance.