An energy-saving temperature control unit

Abstract

The present invention discloses an energy-saving temperature control unit, which includes an outdoor unit and an indoor unit. The outdoor unit includes a compressor refrigeration cycle system and a coolant circulation system. The compressor refrigeration cycle system includes a compressor, a condenser, a liquid receiver, an expansion valve, a parallel structure composed of a plurality of plate heat exchangers, and a gas-liquid separator; the coolant circulation system includes a main water tank, a circulation water pump, an electric three-way valve, a parallel structure composed of a plurality of conventional heat exchangers, a parallel structure of plate heat exchangers, and an indoor unit; the indoor unit includes a heat exchange coil and a configured fan and an electric heater. The present invention designs a combination of two working modes of compressor refrigeration and conventional air cooling, which can avoid the increase in the failure rate of the compressor refrigeration system at low temperatures, and achieves the purpose of saving energy and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of cold liquid units, and in particular to an energy-saving temperature control unit. Background Art

[0002] Compared with air conditioners, cold liquid machines have many characteristics. For example, they avoid the long-distance transmission of refrigerants; reduce the possibility of refrigerant leakage; the cooling capacity is more conveniently transmitted through the coolant (secondary refrigerant); it is easy to achieve multi-group transmission and control, etc. Therefore, they have developed rapidly in recent years. Currently, cold liquid machines are widely used in fields such as power electronics, military and aviation, power stations, medical lasers and diagnostic equipment, cabinet cooling, nuclear power generation, semiconductor equipment, telecommunications fields, and supercomputers. In recent years, especially with the large emergence of high-power radar transmitter units, lasers, and high-energy weapons, military cold liquid machines have gradually developed towards high power, modularization, energy conservation, safety, and environmental friendliness.

[0003] The main purpose of a cold liquid machine is to provide a circulating coolant with certain temperature, flow rate, and pressure requirements for a heat load. Currently, cold liquid units mainly utilize the compression refrigeration principle and are only suitable for use within a relatively narrow temperature range. When used at relatively low temperatures, it will increase the failure rate of the compressor refrigeration system, and the increase in power consumption leads to energy waste. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy-saving temperature control unit to solve the problems that when the existing cold liquid machine is used at low temperatures, it will increase the failure rate of the compressor refrigeration system and increase the power consumption.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] An energy-saving temperature control unit includes an outdoor unit and an indoor unit. The outdoor unit includes a compressor refrigeration cycle system and a coolant circulation system, wherein: the compressor refrigeration cycle system includes a compressor, a condenser, a liquid receiver, an expansion valve, a plurality of plate heat exchangers, and a gas-liquid separator. Each plate heat exchanger has a refrigerant flow channel and a coolant flow channel. The refrigerant flow channels of each plate heat exchanger are connected in parallel with each other, and the coolant flow channels are connected in parallel with each other, thereby forming a parallel structure of plate heat exchangers. The refrigerant output by the compressor sequentially passes through the condenser, the liquid receiver, the expansion valve, the parallel refrigerant flow channels in the parallel structure of plate heat exchangers, and the gas-liquid separator, and then returns to the compressor, thereby forming a refrigerant cycle;

[0007] The coolant circulation system includes a main water tank, a circulation water pump, an electric three-way valve, a plurality of conventional heat exchangers, the parallel structure of the plate heat exchanger, and an indoor unit. The main water tank stores coolant. The plurality of conventional heat exchangers are connected in parallel to form a parallel structure of conventional heat exchangers. The main water tank is connected to the input port of the circulation water pump. The output port of the circulation water pump is connected to one valve port of the electric three-way valve. Another valve port of the electric three-way valve is connected to one end of the parallel structure of conventional heat exchangers. The third valve port of the electric three-way valve is connected to one end of the parallel coolant flow channels in the parallel structure of the plate heat exchanger. The other end of the parallel structure of conventional heat exchangers and the other end of the parallel coolant flow channels in the parallel structure of the plate heat exchanger are commonly connected to the input end of the indoor unit. The output end of the indoor unit is connected to the main water tank, thus forming a coolant circulation. In the coolant circulation, the electric three-way valve is switched to switch and connect the parallel structure of conventional heat exchangers or the parallel coolant flow channels in the parallel structure of the plate heat exchanger;

[0008] The indoor unit includes a heat exchange coil and its configured fan and electric heater. One end of the heat exchange coil serves as the input end of the indoor unit and is used to connect the other end of the parallel structure of conventional heat exchangers and the other end of the parallel coolant flow channels in the parallel structure of the plate heat exchanger. The other end of the heat exchange coil serves as the output end of the indoor unit and is used to connect to the main water tank.

[0009] Furthermore, a liquid replenishment circulation system is further included. The liquid replenishment circulation system includes a main water tank, a first liquid replenishment solenoid valve, a replenishment water tank, a liquid replenishment pump, a liquid replenishment circulation pump, and a second liquid replenishment solenoid valve. The replenishment water tank is connected to an external coolant source through the liquid replenishment pump. The main water tank is connected to the replenishment water tank through the second liquid replenishment solenoid valve. The replenishment water tank is connected to the inlet of the liquid replenishment circulation pump through the first liquid replenishment solenoid valve. The outlet of the liquid replenishment circulation pump is connected to the main water tank, thus forming a liquid replenishment circulation.

[0010] Furthermore, an expansion tank is connected to the main water tank in a communicating manner.

[0011] Furthermore, a safety valve is self-circulated and connected to the main water tank.

[0012] Furthermore, the compressor refrigeration cycle system further includes a solenoid valve. One end of the solenoid valve is bypass-connected between the liquid receiver and the expansion valve, and the other end of the solenoid valve is bypass-connected between the parallel structure of the plate heat exchanger and the gas-liquid separator.

[0013] Furthermore, the pipeline at the output end of the indoor unit is bypass-connected to the pipeline at the input end of the indoor unit through an electric thin ball valve.

[0014] Furthermore, the coolant in the main water tank is water or an ethylene glycol aqueous solution.

[0015] Furthermore, the parallel structure of conventional heat exchangers is integrated with the condenser in the compressor refrigeration cycle system.

[0016] The present invention is further described as follows:

[0017] The present invention provides an energy-saving temperature regulating unit, which achieves the purpose of providing a stable indoor temperature and saving energy by combining conventional air-cooled heat exchange and compressor refrigeration modes.

[0018] The outdoor unit is mainly composed of a compressor refrigeration cycle system, a coolant circulation system, etc. The compressor refrigeration cycle system includes a compressor, a condenser and a fan, an expansion valve, a plate heat exchanger parallel structure, etc. The coolant circulation device includes a plate heat exchanger parallel structure, a conventional heat exchanger parallel structure, a circulating water pump, a main water tank, an expansion tank, an electric three-way valve, etc. The conventional heat exchanger parallel structure is physically integrated with the condenser in the compressor refrigeration cycle system, and shares a fan with the condenser. The coolant circulation system is a closed system design, and the coolant in the coolant circulation system is ethylene glycol aqueous solution or water.

[0019] Indoor equipment mainly includes fans, electric heaters, heat exchange coils, etc. Centrifugal fans are responsible for air circulation, heat exchange coils are responsible for heat exchange with the air, and electric heaters are responsible for heating the air.

[0020] The outdoor unit is responsible for delivering the coolant solution that meets the temperature requirements to the indoor unit. The coolant in the main water tank inside the unit is sent to the plate heat exchanger parallel structure or the conventional heat exchanger parallel structure for cooling and lowering the temperature under the pumping action of the circulating water pump. Among them, in the compressor cooling mode, the coolant exchanges heat with the refrigerant through the plate heat exchanger parallel structure to achieve cooling, and in the conventional heat exchange mode, the coolant exchanges heat with the air through the conventional heat exchanger parallel structure to achieve cooling; the switching between the two is achieved by an electric three-way valve.

[0021] During cooling, the outdoor unit supplies constant low-temperature coolant to the indoor unit. Under the action of the fan in the heat exchange coil, the indoor air exchanges heat with the coolant in the heat exchange coil to achieve cooling and then is supplied to the room, thereby lowering the indoor temperature. The cooling capacity of the indoor unit is proportional to the amount of solution flowing through the heat exchange coil. Therefore, the cooling capacity of the indoor unit can be changed by real-time adjustment of the amount of coolant flowing through the heat exchange coil, thereby ensuring the matching of the cooling capacity with the indoor heat load, thereby achieving the stability of the indoor air temperature.

[0022] During heating, the indoor air passes through the electric heater under the action of the fan of the heat exchange coil and exchanges heat with it to increase the temperature and then is sent into the room, thereby increasing the indoor temperature. The heating amount can be adjusted by regularly adjusting the number of electric heaters installed in the room that are turned on.

[0023] The outdoor unit supplies the indoor unit with coolant within a certain temperature range, providing a cold source for the indoor unit even in low-temperature environments. If the outdoor unit only adopts the compression refrigeration mode, it will increase the failure rate of the compression refrigeration system and the power consumption under low-temperature conditions. Therefore, considering the reliability and energy-saving requirements of the outdoor unit's operation, and to quickly meet the requirements of fluid flow and temperature, the outdoor unit is designed with two working modes: compression refrigeration and conventional air cooling.

[0024] The switching between the two working modes of the outdoor unit is automatically controlled by the main controller based on the temperature feedback from the indoor unit, the ambient temperature where the outdoor unit is located, and the liquid supply temperature as the logical judgment basis. The specific switching control process is as follows: After the liquid supply pump is started, it is detected whether the liquid supply temperature is higher than the normal working value of the coolant circulation system, and the ambient temperature is compared with the mode switching temperature point. If the ambient temperature is higher than this temperature, the outdoor unit adopts the compression refrigeration mode; otherwise, it adopts the conventional air cooling mode. When in the compression refrigeration mode, if the ambient temperature where the outdoor unit is located is lower than the set temperature value, at this time, to save energy, the working mode of the outdoor unit is switched to the conventional air cooling mode. When in the conventional air cooling mode, if the supply temperature of the outdoor unit still exceeds the set temperature value after all the fans are started, it is determined that the conventional air cooling mode cannot meet the working requirements, and the working mode of the outdoor unit is switched to the compression refrigeration mode.

[0025] Advantages of the present invention:

[0026] 1. In the present invention, the outdoor unit is designed with two combined working modes of compression refrigeration and conventional air cooling, which can avoid the increase in the failure rate of the compression refrigeration system at low temperatures, and achieve the purpose of saving energy and reducing energy consumption.

[0027] 2. In the design of the outdoor unit of the present invention, the conventional heat exchanger and the condenser are physically integrated, reducing the volume of the unit. The fan and the condenser fan are shared, which can save costs.

[0028] 3. It can provide circulating coolant with a certain temperature, pressure, and flow rate for the equipment under environmental conditions of -40°C to +50°C, and can adapt to various climate changes, so that the equipment fully meets the wide-temperature design. Description of the Drawings

[0029] Figure 1 is the structural schematic diagram of the embodiment of the present invention. Detailed Embodiments

[0030] The present invention will be further described below in conjunction with the drawings and embodiments.

[0031] As Figure 1As shown in the figure, an energy-saving temperature control unit in this embodiment includes an outdoor unit and an indoor unit. The outdoor unit includes a compressor refrigeration cycle system, a coolant circulation system, and a liquid replenishment circulation system.

[0032] The indoor unit includes a heat exchange coil 30, a filter screen 31, a duct electric heater 29, and a centrifugal fan 28. The heat exchange coil 30 is arranged in the duct. The filter screen 31 is arranged at the air inlet of the duct and faces the air inlet side of the heat exchange coil 30. The duct electric heater 29 and the centrifugal fan 28 are arranged in sequence on the air outlet side of the heat exchange coil 30. The centrifugal fan 28 is responsible for air circulation. The heat exchange coil 30 is responsible for cooling and dehumidifying the air. The electric heater 29 is responsible for heating the air. The filter screen 31 is responsible for filtering the air entering the interior of the equipment.

[0033] The compressor refrigeration cycle system of the outdoor unit includes a compressor 1, a condenser 2 equipped with a condensing fan 3, a liquid receiver 4, a filter 5, an expansion valve 6, a plurality of plate heat exchangers 8, a gas-liquid separator 9, and a solenoid valve 7. Each plate heat exchanger has a refrigerant flow channel and a coolant flow channel respectively. The refrigerant flow channels of each plate heat exchanger are connected in parallel with each other, and the coolant flow channels are connected in parallel with each other, thereby forming a parallel structure of plate heat exchangers. The refrigerant outlet of the compressor 1 is connected to the inlet end of the condenser 2 through a pipeline. The outlet end of the condenser 2 is connected to the inside of the liquid receiver 4 through a pipeline. The inside of the liquid receiver 4 is connected to the inlet end of the filter 5 through a pipeline. The outlet end of the filter 5 is connected to the inlet end of the expansion valve 6 through a pipeline. The outlet end of the expansion valve 6 is connected to one end of the parallel refrigerant flow channels in the parallel structure of plate heat exchangers through a pipeline. The other end of the parallel refrigerant flow channels in the parallel structure of plate heat exchangers is connected to the inlet end of the gas-liquid separator 9 through a pipeline. The outlet end of the gas-liquid separator 9 is connected to the refrigerant return port of the compressor 1 through a pipeline. Thus, the refrigerant output by the compressor 1 sequentially passes through the condenser 2, the liquid receiver 4, the filter 5, the expansion valve 6, the parallel refrigerant flow channels in the parallel structure of plate heat exchangers, and the gas-liquid separator 9 and then returns to the compressor 1, thereby forming a refrigerant cycle. The inlet end of the solenoid valve 7 is bypass-connected to the pipeline between the parallel structure of plate heat exchangers and the gas-liquid separator 9. The outlet end of the solenoid valve 7 is bypass-connected to the pipeline between the filter 5 and the expansion valve 6.

[0034] The coolant circulation system of the outdoor unit includes a main water tank 19, a circulation water pump 17, a check valve 16, an electric three-way valve 10, multiple conventional heat exchangers 15, a coolant filter 13, a first ball valve 11, an electric thin ball valve 12, a second ball valve 14, and a heat exchange coil 30 of the indoor unit, and a parallel structure of plate heat exchangers in the compression refrigeration cycle system. The main water tank 19 stores water or an ethylene glycol aqueous solution as the coolant inside. The multiple conventional heat exchangers 15 are connected in parallel to form a parallel structure of conventional heat exchangers, and the parallel structure of conventional heat exchangers is integrated with the condenser 2 and shares the condensing fan 3. The liquid outlet of the main water tank 19 is connected to the inlet end of the circulation water pump 17 through a pipeline. The outlet end of the circulation water pump 17 is connected to the inlet end of the check valve 16 through a pipeline. The outlet end of the check valve 16 is connected to one valve port of the electric three-way valve 10 through a pipeline. The other valve port of the electric three-way valve 10 is connected to one end of the parallel structure of conventional heat exchangers through a pipeline. The third valve port of the electric three-way valve 10 is connected to one end of the parallel coolant flow channels in the parallel structure of plate heat exchangers through a pipeline. After the other end of the parallel structure of conventional heat exchangers is connected in common with the other end of the parallel coolant flow channels in the parallel structure of plate heat exchangers through the first ball valve 11, it is then connected to the inlet end of the coolant filter 13 through a pipeline. The outlet end of the coolant filter 13 is connected to the inlet end of the heat exchange coil 30 through a pipeline. The outlet end of the heat exchange coil 30 is connected to the water return port of the main water tank 19. Thus, the coolant in the main water tank 19 is pumped into the electric three-way valve 10 by the circulation water pump 17, is switched and conveyed by the electric three-way valve 10 to the parallel structure of conventional heat exchangers or the parallel coolant flow channels in the parallel structure of plate heat exchangers, then enters the heat exchange coil 30 through the coolant filter 13, and finally returns to the main water tank 19 from the heat exchange coil 30 to form a coolant circulation. The inlet end of the electric thin ball valve 12 is bypass-connected to the pipeline between the outlet end of the heat exchange coil 30 and the main water tank 19. The outlet end of the electric thin ball valve 12 is bypass-connected to the pipeline at the inlet end of the coolant filter 13. The inlet end of the second ball valve 14 is bypass-connected to the pipeline between the outlet end of the heat exchange coil 30 and the main water tank 19. The outlet end of the second ball valve 14 is bypass-connected to the pipeline at the outlet end of the coolant filter 13.

[0035] The main water tank 19 is also connected and configured with an expansion tank 20. The drain port of the main water tank 19 is connected to an external drain pipeline through a drain ball valve 27. The main water tank 19 is also configured with a safety valve 18. The inlet end of the safety valve 18 is bypass-connected to the pipeline between the check valve 16 and the electric three-way valve 10 through a pipeline. The outlet end of the safety valve 18 is connected to the inside of the main water tank 19 through a pipeline. Thus, the safety valve 18 is self-circulated and connected to the main water tank 19.

[0036] The liquid replenishment circulation system is used to replenish the main water tank 19. The liquid replenishment circulation system includes a second liquid replenishment solenoid valve 21-02, a first liquid replenishment solenoid valve 21-01, a liquid replenishment tank 23, a precision filter 24, a liquid replenishment circulation pump 25, a check valve 26, and a liquid replenishment pump 22. The main water tank 19 is communicated with the liquid replenishment tank 23 through the second liquid replenishment solenoid valve 21-02. The inlet end of the liquid replenishment pump 22 is connected to an external coolant source. The outlet end of the liquid replenishment pump 22 is communicated with the inside of the liquid replenishment tank 23 through a pipeline. The liquid replenishment tank 23 is connected to the inlet end of the precision filter 24 through a pipeline. The outlet end of the precision filter 24 is connected to the inlet end of the first liquid replenishment solenoid valve 21-01 through a pipeline. The outlet end of the first liquid replenishment solenoid valve 21-01 is connected to the inlet end of the liquid replenishment circulation pump 25 through a pipeline. The outlet end of the liquid replenishment circulation pump 25 is connected to the inlet end of the check valve 26 through a pipeline. The outlet end of the check valve 26 is communicated with the main water tank 19 through a pipeline. Thus, the coolant is replenished into the liquid replenishment tank 23 by the liquid replenishment pump 22, and then the coolant is replenished into the main water tank 19 successively through the precision filter 24, the first liquid replenishment solenoid valve 21-01, the liquid replenishment circulation pump 25, and the check valve 26. The excess coolant in the main water tank 19 returns to the liquid replenishment tank 23 through the second liquid replenishment solenoid valve 21-02.

[0037] The outdoor unit is responsible for transporting the coolant solution that meets the temperature requirements to supply the indoor unit. The coolant in the main water tank 19 inside the unit is pumped into the plate heat exchanger or the conventional heat exchanger by the circulating water pump 17 to be cooled down. In the compression refrigeration mode, the coolant exchanges heat with the refrigerant through the plate heat exchanger 8 to achieve temperature reduction. In the conventional heat exchange mode, the coolant exchanges heat with the air through the conventional heat exchanger 15 to achieve temperature reduction. The switching between the two is realized through the electric three-way valve 10.

[0038] When the ambient temperature is higher than a certain set value, the electric three-way valve 10 is adjusted to the direction of the plate heat exchanger 8 (compression refrigeration mode). The coolant flows through the plate heat exchanger 8, passes through the filter 13, and enters the heat exchange coil 30 under the action of the circulating water pump 17. After absorbing heat, it converges in the main water tank and is then sucked into the circulating water pump 17. In this way, a refrigerating coolant supply circulation process is formed.

[0039] When the ambient temperature is lower than a certain set value, the electric three-way valve 10 is adjusted to the direction of the conventional heat exchanger 15 (conventional heat exchange mode). The coolant flows through the conventional heat exchanger 15, passes through the filter 13, and enters the heat exchange coil 30 under the action of the circulating water pump 17. After absorbing heat, it converges in the main water tank and is then sucked into the circulating water pump 17. In this way, an air-cooled coolant supply circulation process is formed.

[0040] During heating, the indoor air is heated by passing through the air duct electric heater 29 under the action of the centrifugal fan 28 and exchanges heat with it, and then is sent into the room to increase the indoor temperature.

[0041] The control system continuously detects the return liquid pressure (back pressure) of the closed system. When the return liquid pressure is lower than the lower limit of the set value, the replenishing circulation pump 25 operates, and the first replenishing solenoid valve 21-01 opens. The coolant enters the main water tank 19 from the replenishing water tank 23, and the return liquid pressure will rise. When it reaches the upper limit of the set value, the first replenishing solenoid valve 21-01 is closed, and the replenishing circulation pump 25 stops operating. When the return liquid pressure of the equipment is higher than the upper limit of the set value, the second replenishing solenoid valve 21-02 opens, and the coolant in the system will flow to the replenishing water tank 23, reducing the return liquid pressure (back pressure) of the system. When the return liquid pressure is lower than the lower limit of the set value, the second replenishing solenoid valve 21-02 is closed. Thus, the replenishing circulation system is completed. The replenishing pump 22 is used to replenish the replenishing water tank 23.

[0042] When the supply liquid temperature is higher than a certain set value and all protection devices are in normal state, the compression refrigeration unit starts. After the compressor 1 starts, it absorbs the low-pressure refrigerant vapor in the gas-liquid separator 9 and compresses it into a high-temperature and high-pressure gas, which enters the condenser 2; the high-temperature and high-pressure refrigerant gas entering the condenser 2 releases heat in the condenser 2 and becomes a medium-temperature and high-pressure liquid with a certain degree of subcooling; the liquid refrigerant collects in the liquid receiver 4 and successively passes through the dryer filter 5 and the expansion valve 6. Under the throttling and pressure-reducing action of the expansion valve 6, it becomes a low-temperature and low-pressure gas-liquid mixture; the low-temperature and low-pressure gas-liquid mixture enters the plate heat exchanger 8, where the refrigerant liquid vaporizes and absorbs heat, absorbing the heat energy of the coolant passing through the plate heat exchanger 8, and then enters the gas-liquid separator 9 again to enter the next refrigeration cycle. Thus, a fluorine circuit refrigeration cycle system of the liquid cooling device is formed.

[0043] The embodiments described in the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design idea of the present invention, various modifications and improvements made by those skilled in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. An energy-saving temperature control unit, comprising an outdoor unit and an indoor unit, characterized in that, the outdoor unit includes a compressor refrigeration cycle system and a coolant circulation system, wherein: the compressor refrigeration cycle system includes a compressor, a condenser, a liquid receiver, an expansion valve, a plurality of plate heat exchangers, and a gas-liquid separator. Each plate heat exchanger has a refrigerant flow channel and a coolant flow channel respectively. The refrigerant flow channels of each plate heat exchanger are connected in parallel with each other, and the coolant flow channels are connected in parallel with each other, thereby forming a parallel structure of plate heat exchangers. The refrigerant output by the compressor sequentially passes through the condenser, the liquid receiver, the expansion valve, the parallel refrigerant flow channels in the parallel structure of plate heat exchangers, and the gas-liquid separator and then returns to the compressor, thereby forming a refrigerant cycle; the coolant circulation system includes a main water tank, a circulation water pump, an electric three-way valve, a plurality of conventional heat exchangers, as well as the parallel structure of plate heat exchangers and the indoor unit. The main water tank stores coolant. The plurality of conventional heat exchangers are connected in parallel to form a parallel structure of conventional heat exchangers. The main water tank is connected to the input port of the circulation water pump. The output port of the circulation water pump is connected to one valve port of the electric three-way valve. Another valve port of the electric three-way valve is connected to one end of the parallel structure of conventional heat exchangers. The third valve port of the electric three-way valve is connected to one end of the parallel coolant flow channels in the parallel structure of plate heat exchangers. The other end of the parallel structure of conventional heat exchangers and the other end of the parallel coolant flow channels in the parallel structure of plate heat exchangers are commonly connected to the input end of the indoor unit. The output end of the indoor unit is connected to the main water tank, thereby constituting a coolant circulation. In the coolant circulation, the electric three-way valve is switched to switch and access the parallel structure of conventional heat exchangers or the parallel coolant flow channels in the parallel structure of plate heat exchangers; the indoor unit includes a heat exchange coil and a configured fan and an electric heater. One end of the heat exchange coil is used as the input end of the indoor unit for connecting the other end of the parallel structure of conventional heat exchangers and the other end of the parallel coolant flow channels in the parallel structure of plate heat exchangers. The other end of the heat exchange coil is used as the output end of the indoor unit for connecting to the main water tank; the compressor refrigeration cycle system further includes a solenoid valve. One end of the solenoid valve is bypass-connected between the liquid receiver and the expansion valve, and the other end of the solenoid valve is bypass-connected between the parallel structure of plate heat exchangers and the gas-liquid separator; the pipeline at the output end of the indoor unit is bypass-connected to the pipeline at the input end of the indoor unit through an electric thin ball valve.

2. An energy-saving temperature control unit according to claim 1, characterized in that, it further includes a replenishing circulation system. The replenishing circulation system includes a main water tank, a first replenishing solenoid valve, a replenishing tank, a replenishing pump, a replenishing circulation pump, and a second replenishing solenoid valve. The replenishing tank is connected to an external coolant source through the replenishing pump. The main water tank is connected to the replenishing tank through the second replenishing solenoid valve. The replenishing tank is connected to the inlet of the replenishing circulation pump through the first replenishing solenoid valve. The outlet of the replenishing circulation pump is connected to the main water tank, thereby constituting a replenishing circulation.

3. An energy-saving temperature control unit according to claim 1, characterized in that, the main water tank is connected and configured with an expansion tank.

4. An energy-saving temperature control unit according to claim 1, characterized in that, the main water tank is also self-circulated and connected with a safety valve.

5. An energy-saving temperature control unit according to claim 1, characterized in that, the coolant in the main water tank is water or an ethylene glycol aqueous solution.

6. An energy-saving temperature control unit according to claim 1, characterized in that, the parallel structure of the conventional heat exchanger is integrated with the condenser in the compression refrigeration cycle system.

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