Refrigerating unit

Abstract

The invention provides a refrigerating unit, the refrigerating unit is provided with an indoor side and an outdoor side, the refrigerating unit comprises a circulating system and a heat transfer system, and the circulating system is provided with a first loop allowing a liquid working medium to circularly flow; the first loop comprises a first heat exchange unit located on the indoor side, a second heat exchange unit located on the outdoor side, a first flow path and a second flow path, the first flow path and the second flow path are connected between the first heat exchange unit and the second heat exchange unit, and the heat transfer system is connected between the first flow path and the second flow path and used for transferring heat on the low-temperature side in the circulation system to the high-temperature side. And the temperature of the liquid working medium entering the second heat exchange unit is increased to be higher than the environment temperature, so that heat absorbed by the indoor side is completely dissipated into the environment. According to the refrigerating unit, airflow on the indoor side and the outdoor side only needs to penetrate through the first heat exchange unit and the second heat exchange unit respectively, airflow resistance is reduced, therefore, fan power can be reduced, and the purpose of reducing annual power consumption of the refrigerating unit is achieved.

Description

Technical Field

[0001] This application relates to the technical field of air-conditioning refrigeration, and particularly to a refrigeration unit. Background Art

[0002] Currently, in the annual power consumption of the indirect evaporative cooling unit for computer room air conditioners, the main power consumption comes from the fan. Among them, the power consumption of the indoor fan accounts for more than 60%. The reason for such a high power consumption of the indoor fan is that the indoor air volume is the rated air volume, and the indoor fan basically operates at the rated air volume throughout the year. The reason for the high energy efficiency ratio of the indirect evaporative cooling unit lies in the air-to-air heat exchanger in the unit. Due to the low heat transfer efficiency between air and air, the size of the air-to-air heat exchanger needs to be very large, occupying a large space, which in turn leads to a very crowded layout of the entire unit. At the same time, in order to meet the refrigeration requirements under extreme working conditions, the system is coupled with a vapor compression refrigeration cycle system. The vapor compression refrigeration cycle system needs to be equipped with an evaporator and a condenser. When the outdoor ambient temperature is relatively low, the refrigeration requirements can be met only through the air-to-air heat exchanger. However, at this time, the air still has to flow through the evaporator and the condenser, resulting in unnecessary fan and pump power losses. At the same time, due to the very crowded layout of the system, the air path of the system is more complex and the system resistance is greater. These factors all bring difficulties to further improving the energy efficiency of the air conditioner. Summary of the Invention

[0003] In view of this, this application provides a refrigeration unit, aiming to effectively solve the problem of unnecessary fan and pump power losses caused by the air having to flow through the evaporation heat exchange unit and the condensation heat exchange unit in the existing cooling unit.

[0004] This application provides a refrigeration unit. The refrigeration unit has an indoor side and an outdoor side. The refrigeration unit includes a circulation system and a heat transfer system. The circulation system has a first circuit for the liquid refrigerant to circulate. The first circuit includes a first heat exchange unit located on the indoor side, a second heat exchange unit located on the outdoor side, and a first flow path and a second flow path connecting the first heat exchange unit and the second heat exchange unit. The heat transfer system is connected between the first flow path and the second flow path to transfer the heat on the low-temperature side in the circulation system to the high-temperature side.

[0005] In one embodiment, the refrigeration unit includes a single liquid circulation operation mode and a composite operation mode. In the single liquid circulation operation mode, the circulation system operates and the heat transfer system is turned off, and the liquid refrigerant circulates in the first circuit. In the composite operation mode, both the circulation system and the heat transfer system operate, the liquid refrigerant circulates in the first circuit, and the heat transfer system transfers the heat on the low-temperature side in the circulation system to the high-temperature side.

[0006] In one embodiment, the heat transfer system has a second circuit for circulating a refrigeration medium, and the second circuit includes a compression unit, a condensation heat exchange unit, an expansion unit, and an evaporation heat exchange unit connected in sequence.

[0007] In one embodiment, the outlet of the first heat exchange unit is connected to the inlet of the first flow path, the outlet of the first flow path is connected to the inlet of the second heat exchange unit, the outlet of the second heat exchange unit is connected to the inlet of the second flow path, and the outlet of the second flow path is connected to the inlet of the first heat exchange unit; the first flow path is the high-temperature side, and the second flow path is the low-temperature side.

[0008] In one embodiment, the condensation heat exchange unit includes a first heat exchange channel and a second heat exchange channel. The first heat exchange channel is located on the second circuit, and the second heat exchange channel is located on the first flow path; the evaporation heat exchange unit includes a third heat exchange channel and a fourth heat exchange channel. The third heat exchange channel is located on the second circuit, and the fourth heat exchange channel is located on the second flow path.

[0009] In one embodiment, a pump is provided on the first circuit.

[0010] In one embodiment, the indoor side has an indoor air channel communicating with indoor air, and the first heat exchange unit is located in the indoor air channel; the outdoor side has an outdoor air channel communicating with outdoor air, and the second heat exchange unit is located in the outdoor air channel.

[0011] In one embodiment, an indoor fan is provided in the indoor air channel and includes an indoor return air inlet and an indoor supply air outlet corresponding to the indoor fan; the first heat exchange unit is located at the indoor return air inlet; an outdoor fan is provided in the outdoor air channel and includes an outdoor air inlet and an outdoor air outlet corresponding to the outdoor fan; the second heat exchange unit is located at the outdoor air inlet.

[0012] In one embodiment, a direct evaporative cooling device is provided outside the second heat exchange unit, and the direct evaporative cooling device is used to form fine water mist, wet curtain or falling film.

[0013] In one embodiment, the single-liquid circulation operation mode includes a dry mode and a wet mode. In the dry mode, the direct evaporative cooling device is turned off, and in the wet mode, the direct evaporative cooling device operates.

[0014] In summary, the present application provides a refrigeration unit. The refrigeration unit has an indoor side and an outdoor side. The refrigeration unit includes a circulation system and a heat transfer system. The circulation system has a first circuit for the circulating flow of a liquid refrigerant. The first circuit includes a first heat exchange unit located on the indoor side, a second heat exchange unit located on the outdoor side, and a first flow path and a second flow path connecting the first heat exchange unit and the second heat exchange unit. The heat transfer system is connected between the first flow path and the second flow path to transfer the heat on the low-temperature side in the circulation system to the high-temperature side, raising the temperature of the liquid refrigerant entering the second heat exchange unit and making it much higher than the ambient temperature, so as to dissipate all the heat absorbed on the indoor side into the environment. For the refrigeration unit of the present application, the airflows on the indoor side and the outdoor side only need to pass through the first heat exchange unit and the second heat exchange unit respectively, and the air flow resistance is reduced. Therefore, the fan power can be reduced, especially the power consumption of the indoor-side fan, and further the purpose of reducing the annual power consumption of the refrigeration unit can be achieved. Moreover, the refrigeration unit of the present application abandons the existing air-air heat exchange method, can reduce the size of the unit, and improve the structural compactness of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the principle of the refrigeration unit in an embodiment of the present application.

[0016] Figure 2 For using Figure 1 the structure schematic diagram of the principle of the refrigeration unit therein.

[0017] Figure 3 It is a schematic diagram of the principle of the refrigeration unit in another embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Before describing the embodiments in detail, it should be understood that the present application is not limited to the detailed structures or element arrangements described hereinafter or in the accompanying drawings of the present application. The present application can be implemented in other ways. Moreover, it should be understood that the terms and phrases used herein are only for descriptive purposes and should not be construed restrictively. The terms "including", "comprising", "having" and the like used herein are intended to include the matters listed hereinafter, their equivalents and other additional matters. In particular, when describing "a certain element", the present application does not limit the number of such elements to one, and multiple elements can also be included.

[0019] Please refer to Figure 1As shown, the present application provides a refrigeration unit 10, which can be used for computer room air conditioners. The refrigeration unit 10 has two parts: an indoor side 12 and an outdoor side 14. Among them, the indoor side of the refrigeration unit 10 refers to the side connected to the indoor, and the outdoor side refers to the side connected to the outdoor. The refrigeration unit 10 can be set as a box-type air conditioner with an integrated machine structure. The box-type air conditioner can be placed indoors or outdoors, as long as its indoor side can be connected to the indoor and its outdoor side can be connected to the outdoor; alternatively, the indoor side can be used as an indoor unit, and the outdoor side can be used as an outdoor unit, and the indoor unit and the outdoor unit are connected to each other; the indoor unit and the outdoor unit can also be placed indoors or outdoors, or separately placed indoors and outdoors, and again, as long as their indoor sides can be connected to the indoor and their outdoor sides can be connected to the outdoor. The refrigeration unit 10 includes a circulation system and a heat transfer system. Among them, the circulation system has a first circuit 16 for the liquid refrigerant to circulate, and the first circuit 16 includes a first heat exchange unit 18 located on the indoor side 12, a second heat exchange unit 20 located on the outdoor side 14, and a first flow path 22 and a second flow path 24 connecting the first heat exchange unit 18 and the second heat exchange unit 20. The heat transfer system is connected between the first flow path 22 and the second flow path 24, and is used to transfer the heat on the low-temperature side of the circulation system to the high-temperature side, thereby reducing the temperature of the liquid refrigerant entering the first heat exchange unit 18 and increasing the temperature of the liquid refrigerant entering the second heat exchange unit 20, so that when the liquid refrigerant in the first heat exchange unit 18 exchanges heat with the indoor air, it has a better heat exchange effect, and at the same time, the heat absorbed by the indoor side 12 can be completely dissipated into the outdoor environment through the second heat exchange unit 20.

[0020] In the illustrated embodiment, the heat transfer system is disposed on the outdoor side 14. The heat transfer system has a second circuit 26 for the refrigeration medium to circulate, and the second circuit 26 includes a compression unit 28, a condensation heat exchange unit 30, an expansion unit 32, and an evaporation heat exchange unit 34 connected in sequence. In some other embodiments, the heat transfer system can also be disposed on the indoor side 12.

[0021] In the direction shown in the figure, in the circulation system, the liquid refrigerant circulates in the first circuit 16 in a clockwise direction, and the liquid refrigerant always remains in a liquid state during the circulation process. The liquid refrigerant is, for example, water; specifically, the outlet of the first heat exchange unit 18 is connected to the inlet of the first flow path 22, the outlet of the first flow path 22 is connected to the inlet of the second heat exchange unit 20, the outlet of the second heat exchange unit 20 is connected to the inlet of the second flow path 24, and the outlet of the second flow path 24 is connected to the inlet of the first heat exchange unit 18. The first flow path 22 is the high-temperature side, and the second flow path 24 is the low-temperature side, that is, the heat transfer system is used to transfer the heat in the liquid refrigerant in the second flow path 24 to the liquid refrigerant in the first flow path 22.

[0022] In the heat transfer system, the compression unit 28, the condensation heat exchange unit 30, the expansion unit 32, and the evaporation heat exchange unit 34 are arranged in a counterclockwise direction. The refrigeration medium circulates in the second circuit 26 in a counterclockwise direction. During the circulation process, the refrigeration medium continuously undergoes phase changes between liquid and gas states. The refrigeration medium is, for example, a common refrigerant. Among them, the compression unit 28 is, for example, a compressor, the condensation heat exchange unit 30 is, for example, a condenser, the expansion unit 32 is, for example, a throttle valve or an electronic expansion valve, etc., and the evaporation heat exchange unit 34 is, for example, an evaporator.

[0023] In the illustrated embodiment, a pump 36 is provided on the first circuit 16 to provide power for the flow of the liquid working medium in the first circuit 16 and improve the heat exchange efficiency. The pump 36 is, for example, a water pump and is arranged between the first heat exchange unit 18 and the condensation heat exchange unit 30. Preferably, the pump 36 is arranged on the outdoor side 14. In some other embodiments, the pump 36 can also be arranged between the condensation heat exchange unit 30 and the second heat exchange unit 20. Preferably, the pump 36 is arranged between the first heat exchange unit 18 and the condensation heat exchange unit 30. Since there is power input when the pump 36 operates, the water temperature at the outlet of the pump 36 is higher than the water temperature at the inlet. Placing it between the first heat exchange unit 18 and the condensation heat exchange unit 30 can increase the water temperature entering the second heat exchange unit 20.

[0024] In the illustrated embodiment, the indoor side 12 has an indoor air passage 38 communicating with the indoor air. The first heat exchange unit 18 is located in the indoor air passage 38 so that the indoor air can exchange heat with the liquid working medium in the first heat exchange unit 18. The outdoor side 14 has an outdoor air passage 40 communicating with the outdoor air. The second heat exchange unit 20 is located in the outdoor air passage 40 so that the liquid working medium in the second heat exchange unit 20 can exchange heat with the outdoor air.

[0025] More specifically, please refer to Figure 2 As shown, an indoor fan 42 is provided in the indoor air passage 38 and includes an indoor return air inlet and an indoor supply air outlet corresponding to the indoor fan 42. The first heat exchange unit 18 is located at the indoor return air inlet. The indoor air flows through the first heat exchange unit 18, exchanges heat with the liquid working medium in the first heat exchange unit 18, and then returns to the room from the indoor supply air outlet. An outdoor fan 44 is provided in the outdoor air passage 40 and includes an outdoor air inlet and an outdoor air outlet corresponding to the outdoor fan 44. The second heat exchange unit 20 is located at the outdoor air inlet. The outdoor air flows through the second heat exchange unit 20, exchanges heat with the liquid working medium in the second heat exchange unit 20, and then flows out from the outdoor air outlet. Therefore, both the first heat exchange unit 18 and the second heat exchange unit 20 can be single-phase heat exchangers, that is, heat exchangers with air on one side and liquid on the other side, such as finned tube heat exchangers, parallel flow heat exchangers, or other forms of partition wall heat exchangers.

[0026] In the illustrated embodiment, the condensation heat exchange unit 30 includes a first heat exchange channel 46 and a second heat exchange channel 48. Among them, the first heat exchange channel 46 is located on the second circuit 26, that is, when the refrigeration medium flows through the condensation heat exchange unit 30, it flows through the first heat exchange channel 46, and the second heat exchange channel 48 is located on the first flow path 22, that is, when the liquid working medium flows through the condensation heat exchange unit 30, it flows through the second heat exchange channel 48. The evaporation heat exchange unit 34 includes a third heat exchange channel 50 and a fourth heat exchange channel 52. Among them, the third heat exchange channel 50 is located on the second circuit 26, that is, when the refrigeration medium flows through the evaporation heat exchange unit 34, it flows through the third heat exchange channel 50, and the fourth heat exchange channel 52 is located on the second flow path 24, that is, when the liquid working medium flows through the evaporation heat exchange unit 34, it flows through the fourth heat exchange channel 52.

[0027] During the process of the refrigeration medium flowing through the condensation heat exchange unit 30 (the first heat exchange channel 46) and the evaporation heat exchange unit 34 (the third heat exchange channel 50), a gas-liquid two-phase phase change will occur. The liquid working medium remains in a liquid state all the time during the process of flowing through the condensation heat exchange unit 30 (the second heat exchange channel 48) and the evaporation heat exchange unit 34 (the fourth heat exchange channel 52). Therefore, both the condensation heat exchange unit 30 and the evaporation heat exchange unit 34 can be heat exchangers with two phases (gas and liquid) on one side and a single phase (liquid) on the other side, such as plate heat exchangers, shell-and-tube heat exchangers or other types of wall-type heat exchangers.

[0028] The refrigeration unit 10 includes a single liquid cycle operation mode and a composite operation mode. Among them:

[0029] When the outdoor ambient temperature is relatively low (for example, lower than 20 °C), the refrigeration unit 10 can use the single liquid cycle operation mode. At this time, the circulation system operates and the heat transfer system is closed. The liquid working medium circulates in the first circuit 16 driven by the pump 36. The indoor high-temperature air exchanges heat with the liquid working medium in the first heat exchange unit 18 to transfer the indoor heat to the liquid working medium therein through the first heat exchange unit 18 and increase its temperature. After the liquid working medium with increased temperature flows out of the first heat exchange unit 18, it enters the second heat exchange unit 20 through the first flow path 22. The high-temperature liquid working medium in the second heat exchange unit 20 exchanges heat with the outdoor low-temperature air, so that the heat enters the ambient air. The temperature of the liquid working medium in the second heat exchange unit 20 decreases. After the liquid working medium with decreased temperature flows out of the second heat exchange unit 20, it flows back into the first heat exchange unit 18 through the second flow path 24, and circulates in this way to achieve refrigeration in the computer room.

[0030] When the outdoor ambient temperature is relatively high (e.g., higher than 20 °C), both the circulation system and the heat transfer system operate. The liquid working medium circulates in the first loop 16 driven by the pump 36. The heat transfer system transfers the heat of the low-temperature side (the liquid working medium in the first flow path 22) in the circulation system to the high-temperature side (the liquid working medium in the second flow path 24), that is, the heat transfer system uses the condensation heat exchange unit 30 to continue heating the liquid working medium on the high-temperature side and uses the evaporation heat exchange unit 34 to continue cooling the liquid working medium on the low-temperature side. Specifically, the compression unit 28 sucks in the low-pressure gaseous refrigerant and compresses it into a high-pressure gaseous refrigerant. After flowing out of the compression unit 28, the high-pressure gaseous refrigerant enters the first heat exchange channel 46 of the condensation heat exchange unit 30 and condenses into a high-pressure liquid state. The refrigerant in the first heat exchange channel 46 exchanges heat with the liquid working medium in the second heat exchange channel 48. The heat released by the refrigerant during the condensation process is transferred to the liquid working medium to increase its temperature, so that the temperature of the liquid working medium entering the second heat exchange unit 20 is much higher than the ambient temperature, increasing the temperature difference between the two, thereby dissipating all the heat in the indoor air into the outdoor environment. The condensed high-pressure liquid refrigerant flows out of the condensation heat exchange unit 30 and then enters the expansion unit 32 for throttling and pressure reduction. After flowing out of the expansion unit 32, the expanded low-pressure liquid refrigerant enters the third heat exchange channel 50 of the evaporation heat exchange unit 34 and evaporates into a low-pressure gaseous state. The refrigerant in the third heat exchange channel 50 exchanges heat with the liquid working medium in the fourth heat exchange channel 52. The refrigerant absorbs the heat of the liquid working medium during the evaporation process to reduce its temperature. The liquid working medium with reduced temperature enters the first heat exchange unit 18. After flowing out of the evaporation heat exchange unit 34, the evaporated low-pressure gaseous refrigerant flows back into the compression unit 28 and circulates in this way to transfer the heat of the low-temperature side in the circulation system to the high-temperature side, realizing refrigeration in the computer room.

[0031] Please refer to Figure 3 as shown, the refrigeration unit is Figure 1 based on the refrigeration unit 10 shown in the figure, a direct evaporative cooling device 54 is added. The direct evaporative cooling device 54 is arranged at the outdoor air inlet corresponding to the outside of the second heat exchange unit 20, and can be used to spray fine water mist, wet curtain, falling film, etc. on the outdoor air entering the outdoor air inlet to reduce the temperature of the outdoor air, further increasing the temperature difference between the liquid working medium in the second heat exchange unit 20 and the outdoor air. Furthermore, the operation time of the heat transfer system can be further reduced, and the power consumption of the refrigeration unit 10 can be reduced by using the latent heat of vaporization of water, improving the energy efficiency.

[0032] The direct evaporative cooling device 54 is an optional component. For example, Figure 3As shown, when the refrigeration unit is configured with the direct evaporative cooling device 54, the single-liquid circulation operation mode can further include a dry mode and a wet mode. Among them, in the dry mode, the circulation system operates, while the heat transfer system and the direct evaporative cooling device 54 are both turned off, and the liquid refrigerant circulates in the first circuit 16; in the wet mode, both the circulation system and the direct evaporative cooling device 54 operate, and the heat transfer system is turned off. The liquid refrigerant circulates in the first circuit 16, and the direct evaporative cooling device 54 sprays fine water mist, wet curtain, falling film, etc. onto the outdoor air entering the outdoor air inlet, which can improve the performance of the unit.

[0033] It should be noted that Figure 3 the refrigeration unit shown increases the maintenance cost due to the addition of the direct evaporative cooling device 54. While Figure 1 and Figure 2 the refrigeration unit shown does not have the direct evaporative cooling device 54 installed, so the maintenance frequency of the unit can be reduced, thereby reducing the maintenance cost.

[0034] As Figure 2 shown, it is a specific embodiment of the refrigeration unit, where a plurality of auxiliary components are added to the circulation system and the heat transfer system to improve the functionality of the refrigeration unit and enable it to operate better.

[0035] Specifically, the first heat exchange unit 18 and the second heat exchange unit 20 are both configured as finned tube heat exchangers, the compression unit 28 is a compressor, the expansion unit 32 is an electronic expansion valve, and the condensation heat exchange unit 30 and the evaporation heat exchange unit 34 are both configured as plate heat exchangers. Among them, first temperature sensors 56 are respectively arranged on the air inlet side and the air outlet side of the first heat exchange unit 18 and on the air outlet side of the second heat exchange unit 20 to monitor the indoor return air temperature, the indoor supply air temperature, and the ambient temperature; an expansion tank 58, a first filter 60, and a check valve 62 are arranged between the first heat exchange unit 18 and the condensation heat exchange unit 30. The expansion tank 58 is used to decompress the liquid refrigerant flowing out of the first heat exchange unit 18, the first filter 60 is used to filter impurities in the liquid refrigerant to prevent damage to the pump 36, and the check valve 62 is used to limit the flow direction of the liquid refrigerant in the first circuit 16; a pressure sensor 64, a second temperature sensor 66, a solenoid valve 68, and an exhaust valve 70 (at the highest point of the system) are arranged between the condensation heat exchange unit 30 and the second heat exchange unit 20. The pressure sensor 64 and the second temperature sensor 66 are respectively used to monitor the pressure and temperature of the liquid refrigerant flowing out of the condensation heat exchange unit 30. When the monitored pressure is too high, the excess gas in the first circuit 16 can be discharged using the exhaust valve 70, and the solenoid valve 68 is used to regulate the circulation flow rate of the liquid refrigerant; a third temperature sensor 72 and a flow meter 74 are arranged between the evaporation heat exchange unit 34 and the first heat exchange unit 18. The third temperature sensor 72 and the flow meter 74 are respectively used to monitor the temperature and flow rate of the liquid refrigerant flowing out of the evaporation heat exchange unit 34.

[0036] An exhaust gas temperature sensor 76 and a high-pressure switch 78 are provided between the compression unit 28 and the condensation heat exchange unit 30. The exhaust gas temperature sensor 76 is used to monitor the temperature of the refrigerant output by the compression unit 28; the high-pressure switch 78 is used to prevent overpressure. When the condensation pressure exceeds the set safety upper limit, the high-pressure switch 78 will automatically disconnect the circuit, thereby stopping the operation of the compression unit 28. A refrigerant injection port 80, a second filter 82 and a high-pressure pressure sensor 84 are provided between the condensation heat exchange unit 30 and the expansion unit 32. The refrigerant injection port 80 is used to inject refrigerant into the second circuit 26, the second filter 82 is used to remove water vapor in the pipeline, and the high-pressure pressure sensor 84 is used to monitor the pressure value of the refrigerant flowing out of the condensation heat exchange unit 30; a low-pressure pressure sensor 86, a suction temperature sensor 88, a refrigerant injection port 80 and a gas separation device 90 are provided between the evaporation heat exchange unit 34 and the compression unit 28. The low-pressure pressure sensor 86 and the suction temperature sensor 88 are respectively used to monitor the pressure and temperature of the refrigerant flowing out of the evaporation heat exchange unit 34, and the gas separation device 90 is used to ensure that the inlet of the compression unit 28 is gaseous working medium to prevent liquid hammer.

[0037] In summary, the present application provides a refrigeration unit. The refrigeration unit has an indoor side and an outdoor side. The refrigeration unit includes a circulation system and a heat transfer system. The circulation system has a first circuit for circulating liquid working medium. The first circuit includes a first heat exchange unit located on the indoor side, a second heat exchange unit located on the outdoor side, and a first flow path and a second flow path connecting the first heat exchange unit and the second heat exchange unit. The heat transfer system is connected between the first flow path and the second flow path to transfer the heat on the low-temperature side in the circulation system to the high-temperature side, raise the temperature of the liquid working medium entering the second heat exchange unit and make it much higher than the ambient temperature, so as to dissipate all the heat absorbed on the indoor side into the environment. For the refrigeration unit of the present application, the airflows on the indoor side and the outdoor side only need to pass through the first heat exchange unit and the second heat exchange unit respectively, and the air flow resistance is reduced. Therefore, the fan power can be reduced, especially the power consumption of the indoor-side fan can be reduced, and further the purpose of reducing the annual power consumption of the refrigeration unit can be achieved. Moreover, the refrigeration unit of the present application abandons the existing air-air heat exchange method, can reduce the size of the unit, and improve the structural compactness of the unit.

[0038] The concepts described herein can be implemented in other forms without departing from their spirit and characteristics. The specific embodiments disclosed should be considered illustrative rather than restrictive. Therefore, the scope of this application is determined by the appended claims rather than by these previous descriptions. Any changes within the literal meaning and equivalent scope of the claims shall fall within the scope of these claims.

Claims

1. A refrigeration unit, characterized in that, the refrigeration unit has an indoor side and an outdoor side, the refrigeration unit includes a circulation system and a heat transfer system, the circulation system has a first circuit for the liquid refrigerant to circulate, the first circuit includes a first heat exchange unit located on the indoor side, a second heat exchange unit located on the outdoor side, and a first flow path and a second flow path connecting the first heat exchange unit and the second heat exchange unit, and the heat transfer system is connected between the first flow path and the second flow path for transferring the heat on the low-temperature side in the circulation system to the high-temperature side.

2. The refrigeration unit according to claim 1, characterized in that, the refrigeration unit includes a single-liquid circulation operation mode and a composite operation mode. In the single-liquid circulation operation mode, the circulation system operates and the heat transfer system is closed, and the liquid refrigerant circulates in the first circuit; in the composite operation mode, both the circulation system and the heat transfer system operate, the liquid refrigerant circulates in the first circuit, and the heat transfer system transfers the heat on the low-temperature side in the circulation system to the high-temperature side.

3. The refrigeration unit according to claim 1 or 2, characterized in that, the heat transfer system has a second circuit for the refrigeration medium to circulate, and the second circuit includes a compression unit, a condensation heat exchange unit, an expansion unit, and an evaporation heat exchange unit connected in sequence.

4. The refrigeration unit according to claim 3, characterized in that, the outlet of the first heat exchange unit is connected to the inlet of the first flow path, the outlet of the first flow path is connected to the inlet of the second heat exchange unit, the outlet of the second heat exchange unit is connected to the inlet of the second flow path, and the outlet of the second flow path is connected to the inlet of the first heat exchange unit; the first flow path is the high-temperature side, and the second flow path is the low-temperature side.

5. The refrigeration unit according to claim 4, characterized in that, the condensation heat exchange unit includes a first heat exchange channel and a second heat exchange channel, the first heat exchange channel is located on the second circuit, and the second heat exchange channel is located on the first flow path; the evaporation heat exchange unit includes a third heat exchange channel and a fourth heat exchange channel, the third heat exchange channel is located on the second circuit, and the fourth heat exchange channel is located on the second flow path.

6. The refrigeration unit according to claim 1 or 2, characterized in that, a pump is provided on the first circuit.

7. The refrigeration unit according to claim 1 or 2, characterized in that, the indoor side has an indoor air channel communicating with indoor air, and the first heat exchange unit is located in the indoor air channel; the outdoor side has an outdoor air channel communicating with outdoor air, and the second heat exchange unit is located in the outdoor air channel.

8. The refrigeration unit according to claim 7, characterized in that, An indoor air passage is provided with an indoor fan and includes an indoor return air inlet and an indoor supply air outlet provided corresponding to the indoor fan. The first heat exchange unit is located at the indoor return air inlet. An outdoor air passage is provided with an outdoor fan and includes an outdoor air inlet and an outdoor air outlet provided corresponding to the outdoor fan. The second heat exchange unit is located at the outdoor air inlet.

9. The refrigeration unit according to claim 2, characterized in that, a direct evaporation cooling device is provided outside the second heat exchange unit, and the direct evaporation cooling device is used to form fine water mist, wet curtain or falling film.

10. The refrigeration unit according to claim 9, characterized in that, the single liquid circulation operation mode includes a dry mode and a wet mode. In the dry mode, the direct evaporation cooling device is turned off, and in the wet mode, the direct evaporation cooling device operates.

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