CN220541256U - Bidirectional evaporation heat exchanger and multi-split hybrid cold and heat balance system - Google Patents

Abstract

The utility model relates to a bidirectional evaporation heat exchanger and a multi-split hybrid cold and heat balance system. The bidirectional evaporation heat exchanger comprises a closed shell, a centrifugal fan, a heat exchange tube group and an atomization spray head, wherein the centrifugal fan is arranged on one side of the closed shell, the atomization spray head and the heat exchange tube group are arranged in the closed shell, the centrifugal fan is used for sucking water vapor or air in the shell, the water vapor or air in the closed shell exchanges heat with a refrigerant flowing in the heat exchange tube group, an electric roller shutter is arranged on one side of the closed shell, and the opening or closing of the electric roller shutter is used for switching the heating state or the refrigerating state of the heat exchanger. The beneficial effects are as follows: the electric roller shutter is closed to prevent air from entering, high-pressure atomized water runs, and the bidirectional evaporation heat exchanger is used as a flash evaporation condenser; the electric roller shutter is retracted to intake air, high-pressure atomized water is closed, and the bidirectional evaporation heat exchanger is used as an evaporator; the switching between cooling and heating is realized by using a set of equipment.

Description

Bidirectional evaporation heat exchanger and multi-split hybrid cold and heat balance system

Technical Field

The utility model relates to the field of multi-split air conditioners, in particular to a bidirectional evaporation heat exchanger and a multi-split hybrid cold and heat balance system.

Background

The climate change is dealt with, the carbon emission is reduced, and the building industry is becoming a dominant force. Statistics show that the building energy consumption accounts for about 1/3 of the energy consumption of the whole society, the reduction of the energy consumption of the part can obviously improve the whole energy consumption condition of the society, and meanwhile, the energy saving and emission reduction effects and the environmental protection are very obvious. The energy-saving building is greatly promoted, the energy-saving standard is improved, the engineering is improved, the supervision degree is increased, renewable energy sources are promoted, and the energy efficiency of the building is continuously improved, so that the energy-saving building has become a trend. The energy consumption of air conditioners is a considerable proportion of the energy consumption of buildings. The winter and summer festival each year are all when the air conditioner uses frequently, under the circumstances that the energy is intense and the energy consumption is high at present, the problem of environmental pollution is outstanding, energy saving and emission reduction are the necessity of the sustainable development of society. The main devices of the existing multi-split air conditioner comprise a compressor for heating and a condenser for refrigerating, and the heat exchange principle is as follows: the compressor is used for compressing the refrigerant (ammonia gas or freon) into high-pressure saturated gas, and then the high-pressure saturated gas is condensed by the condenser. Because the condensed ammonia or freon cannot flow in the pipeline quickly, the ammonia or freon is throttled by a throttling device, enters an evaporator to be cooled to a set temperature, and can be conveyed to the energy consumption device to exchange heat with the energy consumption device. This means that when heat exchange is performed, the refrigerant needs to be compressed to a certain temperature value higher than the set temperature, and then cooled, so that the energy consumption of the compressor and the condenser is greatly increased, and the heat exchange efficiency is low; and the emission of freon can further aggravate the greenhouse effect, and ammonia is easy to explode, which is not in accordance with the national advocated environmental protection and energy saving safety concept.

With the improvement of living standard, the demand for cold and heat is also changed in the same building, and the multi-split air conditioner utilizes refrigeration cycle to refrigerate or heat the indoor space, and unified refrigeration in summer and unified heating in winter are basic functions of the air conditioner. But at the same time, there is a problem in that once the cooling is turned on, all air conditioners are in a cooling mode, and if the heating is turned on, all air conditioners are in a heating mode. When in a transitional season, such as the weather in the south of China, the temperature comfort level is different for different people. For example, the middle and young people with better physique feel a little hot, the air conditioner needs to be started for refrigeration, and the old and young people feel cold, and then the heating is needed. At present, most common multi-split air conditioner units on the market can only realize a single refrigeration or heating mode. If the requirements of refrigerating and heating in different rooms of one set of system are met, two sets of independent air conditioning systems are installed, and the construction cost is increased.

Therefore, the utility model provides a single-stage subcritical carbon dioxide multi-split hybrid heat and cold balancing system which can be used for switching between a refrigerating state and a heating state, is simple in structure, can supply cold by utilizing one set of system, can realize convenient heat supply, refrigerating and heating switching, can realize cold and heat balance utilization, is energy-saving and environment-friendly, and is an innovative and research machine.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a bidirectional evaporation heat exchanger which can be switched between a refrigerating state and a heating state and has a simple structure. The system can supply cold by using one set of system, and simultaneously can realize heat supply, refrigeration, heating, switching convenience, cold and heat balance utilization, energy conservation and environmental protection.

The utility model provides a bidirectional evaporation heat exchanger, which has the technical scheme that:

the bidirectional evaporation heat exchanger comprises a closed shell, a centrifugal fan, a heat exchange tube group and an atomization spray head, wherein the centrifugal fan is arranged on one side of the closed shell; the centrifugal fan is used for sucking water vapor or air in the shell, the water vapor or air in the closed shell exchanges heat with the refrigerant flowing in the heat exchange tube group, an electric roller shutter is arranged on one side of the closed shell, and the opening or closing of the electric roller shutter is used for switching the heating state or the refrigerating state of the heat exchanger.

Further, the centrifugal fan is a backward inclined centrifugal fan; one side of the rolling curtain is provided with a grid plate.

Single-stage subcritical carbon dioxide multi-online hybrid cold and hot balancing system is characterized in that: the system comprises a bidirectional evaporation heat exchanger, a compressor, a high-pressure gas refrigerant flow pipe, a medium-pressure liquid refrigerant flow pipe and a low-pressure gas refrigerant flow pipe, wherein the suction end of the compressor is communicated with the low-pressure gas refrigerant flow pipe, and the exhaust end of the compressor is communicated with the high-pressure gas refrigerant flow pipe; the bidirectional evaporation heat exchanger is provided with a first port and a second port, the first port is respectively connected with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through a control valve, the first port is controlled to be communicated with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe according to the opening and closing of the control valve, the second port is communicated with the medium-pressure liquid refrigerant flow pipe, the tail end heating component is respectively communicated with the high-pressure gas refrigerant flow pipe and the medium-pressure liquid refrigerant flow pipe, and the tail end refrigerating component is respectively communicated with the medium-pressure liquid refrigerant flow pipe and the low-pressure gas refrigerant flow pipe; the bidirectional evaporation heat exchanger is the bidirectional evaporation heat exchanger.

Further, the compressor, the bi-directional evaporative heat exchanger and the terminal of the equalization system form a single-stage circulation system of carbon dioxide, which operates below the critical point of condensing temperature.

Further, the end component which needs to be switched between the refrigerating state and the heating state controls the communication state of the end component, the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through the opening and closing of the control valve, so that the switching between the refrigerating state and the heating state is completed.

Further, a liquid reservoir is arranged between the second port of the bidirectional evaporation heat exchanger and the medium-pressure liquid refrigerant flow pipe, and a regulating valve is arranged between the liquid reservoir and the second port.

Further, the control valve member is a three-way control valve or two regulating valve groups respectively arranged on different pipelines.

Further, the tail end of the fan coil is provided with a fan coil capable of switching between a refrigerating state and a heating state, one interface of the fan coil is communicated with the medium-pressure liquid refrigerant flow pipe, a pipeline is provided with a regulating valve, the other interface is respectively connected with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through a control valve element, and the communication state of the port, the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe is controlled according to the opening and closing of the control valve element; and a thermometer and a regulating valve are arranged at the joint of the fan coil.

Further, the tail end comprises a floor heating only, an inlet end of the floor heating is communicated with the high-pressure gas refrigerant flow pipe, and an outlet end of the floor heating is communicated with the medium-pressure liquid refrigerant flow pipe; the inlet end of the floor heating is provided with a regulating valve, and the outlet end of the floor heating is provided with a one-way valve, a regulating valve and a thermometer.

Further, the floor heating is a parallel multi-row pipeline arranged in a plurality of rooms, the floor heating pipe comprises an air supply pipe, a liquid return pipe and a plurality of branch pipes, the branch pipes are outwards bent for a plurality of circles continuously and are coiled in the floor, the floor comprises a concrete slab, a reflecting layer, a steel wire mesh sheet, a heat storage layer and a ground brick layer which are paved in sequence, the branch pipes are fixed on the steel wire mesh sheet through clamping rings and are abutted with the coil pipe layer, the reflecting layer is made of aluminum foil or an extrusion molding heat insulation board with the aluminum foil, and the heat storage layer is formed by mixing cobbles, sand and cement.

Further, the tail end comprises a life hot water tank which only heats, the inlet end of the life hot water tank is communicated with the high-pressure gas refrigerant flow pipe, and the outlet end of the life hot water tank is communicated with the medium-pressure liquid refrigerant flow pipe; the inlet end of the domestic hot water tank is provided with a regulating valve, and the outlet end is provided with a regulating valve and a thermometer.

Further, the tail end of the cold and heat accumulator comprises a cold and heat accumulator capable of switching a refrigerating state and a heating state, one interface of the cold and heat accumulator is communicated with the medium-pressure liquid refrigerant flow pipe, a regulating valve is arranged on a pipeline, the other interface is respectively connected with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through control valves, and the communication state of the ports, the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe is controlled according to the opening and closing of the control valves; and a thermometer is arranged at the interface of the cold accumulation and heat accumulation device.

Further, the tail end comprises an infrared radiation heat collector, the inlet end of the infrared radiation heat collector is communicated with the medium-pressure liquid refrigerant flow pipe, a regulating valve is arranged on the pipeline, and the outlet end of the infrared radiation heat collector is communicated with the low-pressure gas refrigerant flow pipe.

Further, the tail end comprises a refrigerated wine cabinet heat exchanger, the inlet end of the wine cabinet heat exchanger is communicated with the medium-pressure liquid refrigerant flow pipe, a regulating valve is arranged on the pipeline, and the outlet end of the wine cabinet heat exchanger is communicated with the low-pressure gas refrigerant flow pipe.

The implementation of the utility model comprises the following technical effects:

the bidirectional evaporation heat exchanger is used as a flash evaporation condenser when the electric roller shutter is closed to prevent air from entering during refrigeration (such as summer), and high-pressure atomized water runs; after the electric roller shutter is closed, the centrifugal fan continuously discharges water vapor in the closed shell out of the closed shell, a needed negative pressure environment is formed in the accommodating cavity, atomized water generated by the atomizing nozzle exchanges heat with high-temperature refrigerants in the heat exchange tube group in the negative pressure environment of the accommodating cavity, the water vapor is quickly flashed, the water mist is changed into steam, heat is absorbed, the environmental temperature in the closed shell is reduced, and the refrigerants are liquefied and condensed. When heating (such as winter), the electric roller shutter is retracted to intake air, the high-pressure atomized water is closed, and the bidirectional evaporation heat exchanger is used as an evaporator; after the electric roller shutter is opened, the outside air exchanges heat with the low-temperature refrigerant in the heat exchange tube group, and the refrigerant is gasified and evaporated.

The single-stage subcritical carbon dioxide multi-split hybrid cold and heat balance system can realize a plurality of working modes of independent refrigeration, independent heating, partial tail end refrigeration and partial tail end heating and the conversion of the same tail end at any time in a refrigerating or heating mode in one set of system by arranging a high-pressure gas refrigerant flow pipe, a medium-pressure liquid refrigerant flow pipe and a low-pressure gas refrigerant flow pipe and improving the connection modes of a bidirectional evaporation heat exchanger, a compressor, a high-pressure pipe, a medium-pressure pipe, a low-pressure pipe and a tail end refrigerating assembly. More advantageously, the heat in the cold-consuming end can be used to provide heat for the heat-requiring end, and the cold in the heat-consuming end can be used to provide cold for the cold-requiring end, and the bi-directional evaporative heat exchanger is switched to a cooling or heating mode according to the cooling or heating requirements of the whole system, so that the cooling or heating requirements of the whole system are balanced. The system efficiency is further improved in an energy carrying and recycling mode, the power consumption is greatly reduced, and energy conservation and environmental protection are truly achieved. Furthermore, the components such as a cold accumulation heat accumulator (such as a cold accumulation heat accumulation swimming pool) and an infrared radiation heat collector can be arranged to ensure the high-efficiency and safe operation of the system.

Drawings

Fig. 1 is a schematic diagram of a bidirectional evaporative heat exchanger according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a single-stage subcritical carbon dioxide multi-split hybrid cooling and heating equalization system according to an embodiment of the present utility model.

Fig. 3 is a schematic diagram illustrating communication between a cooling state and a heating state of a bi-directional evaporation heat exchanger according to an embodiment of the present utility model.

Fig. 4 is a schematic diagram illustrating communication between a cooling state and a heating state of a fan coil according to an embodiment of the present utility model.

Fig. 5 is a schematic diagram showing communication between a thermal storage state and a cold storage state of the regenerator according to an embodiment of the present utility model.

In the figure: 1. a bi-directional evaporative heat exchanger; 100. a closed housing; 101. a centrifugal fan; 102. a heat exchange tube group; 103. an atomizing nozzle; 104. electric roller shutter; 105. a grid plate; 106. a first port; 107. a second port; 2. a compressor; 3. a high pressure gas refrigerant flow tube; 4. a medium pressure liquid cryogen flow conduit; 5. a low pressure gas refrigerant flow tube; 6. a reservoir; 7. a regulating valve; 8. a control valve member; 9. a thermometer; 10. a fan coil; 11. floor heating; 12. a domestic hot water tank; 13. a cold and heat accumulator; 14. an infrared radiation collector; 15. a wine cabinet heat exchanger.

Detailed Description

The utility model will now be described in detail with reference to the following examples and the accompanying drawings, it being pointed out that the examples described are intended only to facilitate an understanding of the utility model and are not intended to be limiting in any way.

Referring to fig. 1, the bidirectional evaporation heat exchanger of the present embodiment includes a closed casing 100, a centrifugal fan 101, a heat exchange tube group 102 and an atomizer 103, wherein the centrifugal fan 101 is disposed on one side of the closed casing 100, the atomizer 103 and the heat exchange tube group 102 are disposed in the closed casing 100, the atomizer 103 is connected with a high-pressure water pipe, the heat exchange tube group 102 includes a plurality of rows of pipes for circulating a refrigerant, the centrifugal fan 101 is used for sucking water vapor or air in the casing, the water vapor or air in the closed casing 100 exchanges heat with the refrigerant circulating in the heat exchange tube group 102, an electric roller shutter 104 is disposed on one side of the closed casing 100, and the opening or closing of the electric roller shutter 104 is used for switching the heating state or the refrigerating state of the heat exchanger. By arranging the electric roller blind 104 and matching with the flowing direction of the refrigerant, the switching of the heating state or the refrigerating state can be completed by using one set of equipment, and the equipment cost and the system complexity are reduced. The atomizer 103 is connected with a high-pressure water pipe, and the atomizer 103 is used for generating atomized water. The centrifugal fan 101 is a backward inclined centrifugal fan 101. A grid plate 105 is provided on one side of the roller blind. In the refrigeration mode, the water vapor after heat exchange is not circulated and recovered and is directly discharged to the atmosphere, and the heat is mainly converted into internal energy in the water micelle decomposition process, so that the temperature of the discharged water vapor is not high and a heat island effect is not generated. When the closed shell 100 is used for refrigerating, heat exchange is carried out in the closed shell, air is hardly supplied, and when the external temperature and the external humidity are high, the heat exchange effect is not affected by the external temperature and the external humidity.

Referring to fig. 2, the single-stage subcritical carbon dioxide multi-split hybrid cold and heat balance system provided in this embodiment includes a bidirectional evaporation heat exchanger 1, a compressor 2, a high-pressure gas refrigerant flow pipe 3, a medium-pressure liquid refrigerant flow pipe 4 and a low-pressure gas refrigerant flow pipe 5, wherein a suction end of the compressor 2 is communicated with the low-pressure gas refrigerant flow pipe 5, and an exhaust end of the compressor 2 is communicated with the high-pressure gas refrigerant flow pipe 3; the bidirectional evaporation heat exchanger 1 is provided with a first port 106 and a second port 107, the first port 106 is respectively connected with the high-pressure gas refrigerant flow pipe 3 and the low-pressure gas refrigerant flow pipe 5 through a control valve member 8, the first port 106 is controlled to be communicated with the high-pressure gas refrigerant flow pipe 3 and the low-pressure gas refrigerant flow pipe 5 according to the opening and closing of the control valve member 8, the second port 107 is communicated with the medium-pressure liquid refrigerant flow pipe 4, the tail end heating component is respectively communicated with the high-pressure gas refrigerant flow pipe 3 and the medium-pressure liquid refrigerant flow pipe 4, and the tail end refrigerating component is respectively communicated with the medium-pressure liquid refrigerant flow pipe 4 and the low-pressure gas refrigerant flow pipe 5. The bi-directional evaporation heat exchanger 1 is one component or a plurality of combinations of a refrigerating component and a heating component, wherein the component can realize refrigeration and refrigeration dynamic switching. The end component which needs to be switched between the refrigerating state and the heating state controls the communication state of the end component, the high-pressure gas refrigerant flow pipe 3 and the low-pressure gas refrigerant flow pipe 5 through the opening and closing of the control valve element 8, so that the switching between the refrigerating state and the heating state is completed. An accumulator 6 is arranged between the second port 107 of the bi-directional evaporation heat exchanger 1 and the medium-pressure liquid refrigerant flow pipe 4, the accumulator 6 is used for storing liquid refrigerant, and a regulating valve 7 is arranged between the accumulator 6 and the second port 107. The control valve member 8 is a three-way control valve or two sets of regulating valves 7 respectively arranged on different pipelines. The left frame part of fig. 3 is a communication schematic diagram of the refrigerating state of the bidirectional evaporation heat exchanger, the broken line indicates no communication, the arrow indicates the flowing direction of the refrigerant, and the electric rolling curtain 104 is closed to prevent air inlet when refrigerating (such as summer), and the high-pressure atomized water runs, so that the bidirectional evaporation heat exchanger is used as a flash condenser; after the electric roller shutter 104 is closed, the centrifugal fan 101 continuously discharges water vapor in the closed shell 100 out of the closed shell 100, a needed negative pressure environment is formed in the accommodating cavity, atomized water generated by the atomizing nozzle 103 exchanges heat with high-temperature refrigerant in the heat exchange tube group 102 in the negative pressure environment of the accommodating cavity, the water vapor is quickly flashed, the water mist is changed into steam, heat is absorbed, the environmental temperature in the closed shell 100 is reduced, and the refrigerant is liquefied and condensed. The right frame part of fig. 3 is a communication schematic diagram of the heating state of the bidirectional evaporation heat exchanger, the broken line indicates no communication, the arrow indicates the flowing direction of the refrigerant, and when heating (such as winter), the electric roller shutter 104 is retracted to intake air, the high-pressure atomized water is closed, and the bidirectional evaporation heat exchanger is used as an evaporator; after the electric roller shutter 104 is opened, the outside air exchanges heat with the low-temperature refrigerant in the heat exchange tube group 102, and the refrigerant is gasified and evaporated.

According to the single-stage subcritical carbon dioxide multi-split hybrid cold and heat balance system, through arranging the high-pressure gas refrigerant runner pipe 3, the medium-pressure liquid refrigerant runner pipe 4 and the low-pressure gas refrigerant runner pipe 5 and improving the connection modes of the bidirectional evaporation heat exchanger 1, the compressor 2, the high-pressure pipe, the medium-pressure pipe and the low-pressure pipe, the connection modes of the tail end heating component and the tail end refrigerating component, a set of system can be provided with a plurality of working modes of independent refrigeration, independent heating, partial tail end refrigeration and partial tail end heating and the same tail end at any time conversion of refrigeration or heating modes, the diversity of the overall operation condition of the multi-split air conditioning system is improved under the condition that complicated refrigerant switching pipelines are not added, the different requirements of different crowds on comfort are met, and the cold and heat requirements of different tail ends are met, namely, the various cold and heat requirements of a building complex are met through one set of system. More advantageously, the heat in the cold-consuming end can be used to provide heat for the heat-requiring end, and the cold in the heat-consuming end can be used to provide cold for the cold-requiring end, and the bi-directional evaporative heat exchanger 1 is switched to a cooling or heating mode according to the cold-heat requirement of the whole system, so as to balance the cold-heat requirement of the whole system. The system efficiency is further improved in an energy carrying and recycling mode, the power consumption is greatly reduced, and energy conservation and environmental protection are truly achieved. Further, the components such as the cold and heat accumulator 13 (such as a cold and heat accumulation swimming pool) and the infrared radiation heat collector 14 can be arranged to ensure the efficient and safe operation of the system.

Further, the compressor 2, the bi-directional evaporative heat exchanger 1 and the ends of the equalization system constitute a single-stage circulation system of carbon dioxide, which operates below the critical point of the condensation temperature (subcritical). The embodiment uses carbon dioxide medium as the refrigerating medium of the balancing system, and uses carbon dioxide as the circulating working medium, so that the method has the advantages of large pressure difference, good fluidity, small density and trans-critical phase change, and is more obvious in effect when used for high-rise buildings. The single-stage carbon dioxide circulating system using carbon dioxide as a single circulating working medium is different from a cascade system in the meaning of single stage, and only uses carbon dioxide medium for circulation without cascade. The equalizing system of this embodiment uses carbon dioxide as working medium, can be for higher floor cooling or heating in vertical height, can circulate farther distance in the floor of plane application, can drive more indoor set work.

Referring to fig. 1 and 4, the tail end of the fan coil 10 capable of switching between a refrigerating state and a heating state is arranged, one interface of the fan coil 10 is communicated with a medium-pressure liquid refrigerant flow pipe 4, a regulating valve 7 is arranged on a pipeline, the other interface is respectively connected with a high-pressure gas refrigerant flow pipe 3 and a low-pressure gas refrigerant flow pipe 5 through a control valve element 8, and the communication state of the port with the high-pressure gas refrigerant flow pipe 3 and the low-pressure gas refrigerant flow pipe 5 is controlled according to the opening and closing of the control valve element 8; a thermometer 9 and a regulating valve 7 are arranged at the interface of the fan coil 10. The thermometer 9 is used for feeding back temperature and adjusting refrigerating capacity and heating capacity. The left frame in fig. 4 is a schematic diagram showing the cooling state of the fan coil 10, the broken line shows no communication, the arrow shows the direction of refrigerant flow, and the right frame in fig. 4 is a schematic diagram showing the heating state of the fan coil 10, the broken line shows no communication, and the arrow shows the direction of refrigerant flow.

Referring to fig. 1, the terminal includes a floor heating unit 11 which heats only, an inlet end of the floor heating unit 11 is communicated with a high-pressure gas refrigerant flow pipe 3, and an outlet end is communicated with a medium-pressure liquid refrigerant flow pipe 4. The inlet end of the floor heating 11 is provided with a regulating valve 7, and the outlet end is provided with a one-way valve, the regulating valve 7 and a thermometer 9. The check valve can avoid liquid refrigerant to flow back, and the thermometer 9 is used for feeding back temperature and adjusting heating amount. The floor heating 11 is a parallel type multi-row pipeline installed in a plurality of rooms. The floor heating coil comprises an air supply pipe, a liquid return pipe and a plurality of branch pipes, the branch pipes are outwards and continuously bent for a plurality of circles and are covered in the floor, the floor comprises a concrete slab, a reflecting layer, a steel wire mesh sheet, a heat storage layer and a ground brick layer which are sequentially paved, the branch pipes are fixed on the steel wire mesh sheet through clamping rings and are abutted to the coil pipe layer, the reflecting layer is specifically made of aluminum foil or an extrusion molding heat insulation board with the aluminum foil, and the aluminum foil is used for transmitting heat radiated by the branch pipes to the upper end of the reflecting layer in a reflecting mode, so that uniform heat conduction is achieved. The heat accumulating layer is formed by mixing cobblestones, sand and cement, the cobblestones have good heat conducting performance, the appearance is smooth and has no edges and corners, and the heat accumulating layer is beneficial to protecting the branch pipes while fully transferring heat. Carbon dioxide is adopted as a medium to conduct heat transfer to the ground, carbon dioxide has good heat conductivity, in the heat transfer process, carbon dioxide enters into the branch pipe from the air supply pipe in a gaseous form, the temperature is reduced and converted into liquid after heat exchange with the floor in the branch pipe, and the liquid flows out of the liquid return pipe.

Referring to fig. 1, the terminal includes a life hot water tank 12 which heats only, an inlet end of the life hot water tank 12 is communicated with a high pressure gas refrigerant flow pipe 3, and an outlet end is communicated with a medium pressure liquid refrigerant flow pipe 4. The inlet end of the domestic hot water tank 12 is provided with a regulating valve 7, and the outlet end is provided with the regulating valve 7 and a thermometer 9. The thermometer 9 is used for feeding back temperature and adjusting heating amount. When the system is in normal operation or the hot water demand is small, the sensible heat of the exhaust gas of the compressor 2 is recovered to prepare domestic hot water, and the inlet and outlet regulating valves 7 of the domestic hot water tank 12 are in a normally open state and are not regulated; when the hot water demand is large and can not meet the use requirement, the inlet regulating valve 7 of the domestic hot water tank 12 is in a normally open state, and the outlet regulating valve 7 is regulated according to the set parameter value of the outlet temperature sensor.

Referring to fig. 1 and 5, the terminal comprises a cold and heat accumulator 13 capable of switching between a refrigerating state and a heating state, one interface of the cold and heat accumulator 13 is communicated with a medium-pressure liquid refrigerant flow pipe 4, a regulating valve 7 is arranged on a pipeline, the other interface is respectively connected with a high-pressure gas refrigerant flow pipe 3 and a low-pressure gas refrigerant flow pipe 5 through a control valve element 8, and the communication state of the port with the high-pressure gas refrigerant flow pipe 3 and the low-pressure gas refrigerant flow pipe 5 is controlled according to the opening and closing of the control valve element 8; a thermometer 9 is arranged at the interface of the cold and heat accumulator 13. The thermometer 9 is used for feeding back temperature and adjusting refrigerating capacity and heating capacity. The left frame portion in fig. 5 is a schematic diagram of the communication of the regenerative state of the regenerator 13, the broken line indicates the non-communication, the arrow indicates the refrigerant flowing direction, and the right frame portion in fig. 5 is a schematic diagram of the communication of the regenerative state of the regenerator 13, the broken line indicates the non-communication, and the arrow indicates the refrigerant flowing direction. The cold and heat accumulator can be a swimming pool, and the system can heat the water in the swimming pool to a temperature suitable for swimming; the swimming pool is used as a condenser to discharge the heat of the room when the cooling capacity requirement of the room is large and the system does not meet the use requirement; when the heat required by the room is large and the system does not meet the use requirement, the swimming pool is used as an evaporator, and heat is extracted from the swimming pool to be supplied to the room.

Referring to fig. 5, the tail end comprises an infrared radiation collector 14, the inlet end of the infrared radiation collector 14 is communicated with a medium-pressure liquid refrigerant flow pipe 4, a regulating valve 7 is arranged on the pipeline, and the outlet end of the infrared radiation collector is communicated with a low-pressure gas refrigerant flow pipe 5. According to the heat demand of the system, the communication state of the infrared radiation heat collector 14 is controlled through the regulating valve 7 to provide heat for the system. The infrared radiation collector 14 can collect a part of heat in a heat radiation mode, and also can collect heat by utilizing the air energy collector, so that the heating requirement of the system is ensured. In this embodiment, the infrared radiation heat collector 14 includes a protection plate, a heat absorbing plate, and a plate core, the heat absorbing plate is located between the plate core and the protection plate, the plate core includes a heat exchange medium inlet end and a heat exchange medium outlet end, and the heat absorbing plate is used for transferring the absorbed heat to the refrigerant circulating in the plate core.

Referring to fig. 1, the tail end comprises a refrigerated wine cabinet heat exchanger 15, the inlet end of the wine cabinet heat exchanger 15 is communicated with a medium-pressure liquid refrigerant runner pipe 4, a regulating valve 7 is arranged on a pipeline, and the outlet end of the wine cabinet heat exchanger is communicated with a low-pressure gas refrigerant runner pipe 5. According to the required cooling capacity of the wine cabinet heat exchanger 15, the flow of the refrigerant is controlled through the regulating valve 7, so that cooling is realized.

In this embodiment, the regulator valve 7 may be a solenoid valve or an electronic expansion valve.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (14)

1. The bidirectional evaporation heat exchanger comprises a closed shell, a centrifugal fan, a heat exchange tube group and an atomization spray head, wherein the centrifugal fan is arranged on one side of the closed shell; the centrifugal fan is used for sucking water vapor or air in the shell, and the water vapor or air in the closed shell exchanges heat with the refrigerant flowing in the heat exchange tube group, and is characterized in that: an electric rolling curtain is arranged on one side of the closed shell, and the opening or closing of the electric rolling curtain is used for switching the heating state or the refrigerating state of the heat exchanger.

2. A bi-directional evaporative heat exchanger as set forth in claim 1 wherein: the centrifugal fan is a backward inclined centrifugal fan; one side of the rolling curtain is provided with a grid plate.

3. Single-stage subcritical carbon dioxide multi-online hybrid cold and hot balancing system is characterized in that: the system comprises a bidirectional evaporation heat exchanger, a compressor, a high-pressure gas refrigerant flow pipe, a medium-pressure liquid refrigerant flow pipe and a low-pressure gas refrigerant flow pipe, wherein the suction end of the compressor is communicated with the low-pressure gas refrigerant flow pipe, and the exhaust end of the compressor is communicated with the high-pressure gas refrigerant flow pipe; the bidirectional evaporation heat exchanger is provided with a first port and a second port, the first port is respectively connected with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through a control valve, the first port is controlled to be communicated with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe according to the opening and closing of the control valve, the second port is communicated with the medium-pressure liquid refrigerant flow pipe, the tail end heating component is respectively communicated with the high-pressure gas refrigerant flow pipe and the medium-pressure liquid refrigerant flow pipe, and the tail end refrigerating component is respectively communicated with the medium-pressure liquid refrigerant flow pipe and the low-pressure gas refrigerant flow pipe; the bi-directional evaporative heat exchanger is the bi-directional evaporative heat exchanger of claim 1 or 2.

4. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the compressor, the bidirectional evaporation heat exchanger and the tail end of the balancing system form a carbon dioxide single-stage circulating system, and the carbon dioxide single-stage circulating system operates below a critical point of condensation temperature.

5. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end component which needs to be switched between the refrigerating state and the heating state controls the communication state of the tail end component, the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through the opening and closing of the control valve element, so that the switching between the refrigerating state and the heating state is finished.

6. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: and a liquid reservoir is arranged between the second port of the bidirectional evaporation heat exchanger and the medium-pressure liquid refrigerant flow pipe, and a regulating valve is arranged between the liquid reservoir and the second port.

7. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the control valve member is a three-way control valve or two regulating valve groups respectively arranged on different pipelines.

8. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end of the fan coil is provided with a fan coil capable of switching between a refrigerating state and a heating state, one interface of the fan coil is communicated with the medium-pressure liquid refrigerant flow pipe, a pipeline is provided with a regulating valve, the other interface is respectively connected with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through a control valve element, and the communication state of the port, the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe is controlled according to the opening and closing of the control valve element; and a thermometer and a regulating valve are arranged at the joint of the fan coil.

9. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end of the medium-pressure liquid refrigerant circulation pipe comprises a ground heater only for heating, an inlet end of the ground heater is communicated with the high-pressure gas refrigerant circulation pipe, and an outlet end of the ground heater is communicated with the medium-pressure liquid refrigerant circulation pipe; the inlet end of the floor heating is provided with a regulating valve, and the outlet end of the floor heating is provided with a one-way valve, a regulating valve and a thermometer.

10. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 9, wherein: the floor heating system is characterized in that the floor heating system is a parallel multi-row pipeline arranged in a plurality of rooms, the floor heating pipe comprises an air supply pipe, a liquid return pipe and a plurality of branch pipes, the branch pipes are outwards bent for a plurality of circles and are coiled in the floor, the floor comprises concrete slabs, reflecting layers, steel wire meshes, heat accumulating layers and ground brick layers which are paved in sequence, the branch pipes are fixed on the steel wire meshes through clamping rings and are abutted to the coil pipe layers, the reflecting layers are made of aluminum foils or extrusion molding heat insulating boards with the aluminum foils, and the heat accumulating layers are formed by mixing cobbles, sand and cement.

11. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end of the medium-pressure liquid refrigerant circulation pipe comprises a life hot water tank which only heats, the inlet end of the life hot water tank is communicated with the high-pressure gas refrigerant circulation pipe, and the outlet end of the life hot water tank is communicated with the medium-pressure liquid refrigerant circulation pipe; the inlet end of the domestic hot water tank is provided with a regulating valve, and the outlet end is provided with a regulating valve and a thermometer.

12. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end of the cold and heat accumulator is provided with a cold and heat accumulator capable of switching a refrigerating state and a heating state, one interface of the cold and heat accumulator is communicated with the medium-pressure liquid refrigerant flow pipe, a pipeline is provided with a regulating valve, the other interface is respectively connected with the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe through a control valve element, and the communication state of the port, the high-pressure gas refrigerant flow pipe and the low-pressure gas refrigerant flow pipe is controlled according to the opening and closing of the control valve element; and a thermometer is arranged at the interface of the cold accumulation and heat accumulation device.

13. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end of the device comprises an infrared radiation heat collector, the inlet end of the infrared radiation heat collector is communicated with the medium-pressure liquid refrigerant flow pipe, a regulating valve is arranged on the pipeline, and the outlet end of the infrared radiation heat collector is communicated with the low-pressure gas refrigerant flow pipe.

14. The single-stage subcritical carbon dioxide multi-split hybrid heat and cold balance system of claim 3, wherein: the tail end comprises a refrigerated wine cabinet heat exchanger, the inlet end of the wine cabinet heat exchanger is communicated with the medium-pressure liquid refrigerant flow pipe, a regulating valve is arranged on the pipeline, and the outlet end of the regulating valve is communicated with the low-pressure gas refrigerant flow pipe.