Phase change refrigeration system and refrigeration method

Abstract

The present disclosure provides a phase change refrigeration system and a refrigeration method, which relate to the field of refrigeration systems, and in particular to the field of data center refrigeration. The specific implementation scheme is as follows: the system includes: a phase change circulation device, a cooling tower centrally arranged on the roof, and a terminal heat exchange device arranged in the house; the phase change circulation device and the cooling tower are connected through a first pipeline, and the phase change circulation device and the terminal heat exchange device are connected through a second pipeline; the cooling fluid in the cooling tower is transmitted to the phase change circulation device through the first pipeline, and the cooling fluid absorbs the heat of the gaseous refrigerant in the phase change circulation device to convert the gaseous refrigerant into liquid refrigerant; after absorbing the heat, the cooling fluid is transported to the cooling tower through the first pipeline for further cooling; the liquid refrigerant is transported to the terminal heat exchange device through the second pipeline to cool the room. The phase change refrigeration system provided by the present disclosure has the effect of improving the energy efficiency of the refrigeration system.

Description

Technical Field

[0001] The present disclosure relates to the technical field of refrigeration systems, and in particular to a phase change refrigeration system and a refrigeration method in the field of data center refrigeration. Background Art

[0002] Data centers are specialized, globally coordinated networks of equipment used to transmit, accelerate, display, compute, and store data on the internet's infrastructure. With the development of internet technology, the demand for data centers has increased significantly in recent years. However, the equipment within data centers generates significant heat during operation, necessitating cooling and dissipation. Summary of the Invention

[0003] The present disclosure provides a phase change refrigeration system and a refrigeration method.

[0004] According to one aspect of the present disclosure, there is provided a phase change refrigeration system, the system comprising:

[0005] Phase change circulation device, cooling tower centrally installed on the roof and terminal heat exchange device installed inside the house;

[0006] The phase change circulation device is connected to the cooling tower via a first pipeline, and the phase change circulation device is connected to the terminal heat exchange device via a second pipeline;

[0007] The cooling fluid in the cooling tower is transmitted to the phase change circulation device through the first pipeline, and the cooling fluid absorbs heat from the gaseous refrigerant in the phase change circulation device to convert the gaseous refrigerant into liquid refrigerant;

[0008] After absorbing heat, the cooling fluid is transported to the cooling tower through the first pipeline for further cooling; the liquid refrigerant is transported to the terminal heat exchange device through the second pipeline to cool the room.

[0009] According to another aspect of the present disclosure, a refrigeration method of a phase change refrigeration system is provided, the method comprising:

[0010] The cooling tower transports the cooling fluid to the phase change circulation device through the first pipeline, so that the cooling fluid absorbs heat in the phase change circulation device to convert the gaseous refrigerant into liquid refrigerant, and the cooling fluid after absorbing the heat is transported to the cooling tower through the first pipeline for further cooling;

[0011] The phase change circulation device transports the liquid refrigerant to the terminal heat exchange device through the second pipeline, so that the liquid refrigerant absorbs heat in the terminal heat exchange device and changes from liquid to gas to cool the room; the gaseous refrigerant is transported to the phase change circulation device through the second pipeline, so that the gaseous refrigerant is cooled into liquid refrigerant in the phase change circulation device.

[0012] The phase change refrigeration system and refrigeration method provided by the present disclosure can improve the energy efficiency of the refrigeration system.

[0013] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are provided to facilitate a better understanding of the present invention and do not constitute a limitation of the present disclosure.

[0015] Figure 1 is a schematic diagram of a phase change refrigeration system according to an embodiment of the present disclosure;

[0016] Figure 2 is a schematic diagram of a phase change cycle device according to an embodiment of the present disclosure;

[0017] Figure 3 is a schematic diagram of a heat exchanger according to an embodiment of the present disclosure;

[0018] Figure 4 is a schematic diagram between a cooling tower and a heat exchanger according to an embodiment of the present disclosure;

[0019] Figure 5 is a schematic diagram of a cooling tower and a heat exchanger according to another embodiment of the present disclosure;

[0020] Figure 6 is a schematic diagram of an evaporator according to an embodiment of the present disclosure;

[0021] Figure 7 It is a flow chart of a refrigeration method of a phase change refrigeration system according to an embodiment of the present disclosure.

[0022] Figure numerals: 1. Phase change circulation device; 11. Heat exchanger; 111. First inlet; 112. First outlet; 113. Second inlet; 114. Second outlet; 12. Air pump; 13. Liquid pump; 14. Filter; 15. Liquid storage tank; 16. Valve; 2. Cooling tower; 21. Water pump; 22. Fluid pump; 3. Terminal heat exchange device; 31. Evaporator; 311. Heat exchange back plate; 312. Liquid supply coil; 313. Flow valve; 314. Temperature sensor; 32. Compressor; 4. First pipeline; 5. Second pipeline; 51. Liquid pipe section; 52. Air pipe section. DETAILED DESCRIPTION

[0023] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0024] The present disclosure provides a phase-change refrigeration system that can be applied in a wide range of fields, including healthcare, the mechanical and electronic industries, food engineering, and indoor building cooling. Taking the cooling of a data center within a building as an example, a data center generally refers to a physical space that centrally processes, stores, transmits, exchanges, and manages information. Computer equipment, servers, network devices, and storage devices are generally considered key equipment in a network's core computer room. When these devices are operating, the temperature within the physical space continues to rise. Failure to cool this space can affect the normal operation of these devices.

[0025] In existing data centers, traditional chilled water systems are used for cooling. Chilled water circulates through chillers to produce chilled water, which is then powered by water pumps and supplied to precision air conditioners in the rooms. This water pumps heat generated by the chillers to cooling towers, where it is cooled by outdoor air and released into the atmosphere. When used in high-rise buildings, this system suffers from high energy consumption and poor energy efficiency due to the large volumes of cooling water required to be delivered to these high-rise buildings. This requires sufficient power from the pumps, resulting in high energy consumption and poor energy efficiency. This system also fails to meet PUE (a metric for evaluating data center energy efficiency) requirements. Furthermore, high-rise water delivery requires corresponding engineering pipelines, which are complex to lay out in high-rise buildings. Therefore, existing chilled water systems are unsuitable for high-rise buildings and do not meet energy efficiency requirements.

[0026] In order to solve the above problems, an embodiment of the present disclosure provides a phase change refrigeration system, such as Figure 1 As shown, the system includes:

[0027] Phase change circulation device 1, cooling tower 2 and terminal heat exchange device 3.

[0028] For example, the refrigeration system cools down a data center indoors in a high-rise building. The terminal heat exchange device 3 is arranged indoors in the building. The phase change circulation device 1 corresponds one-to-one to the terminal heat exchange device 3 and the phase change circulation device 1 is arranged outside the high-rise building. The cooling tower 2 is centrally arranged on the roof of the high-rise building. One cooling tower 2 can be connected to multiple phase change cooling devices.

[0029] like Figure 2As shown, the phase change circulation device 1 and the cooling tower 2 are connected via a first pipeline 4 , and the phase change circulation device 1 and the terminal heat exchange device 3 are connected via a second pipeline 5 .

[0030] The cooling fluid in the cooling tower 2 is transmitted to the phase change circulation device 1 through the first pipeline 4. The cooling fluid absorbs heat from the gaseous refrigerant in the phase change circulation device 1 to convert the gaseous refrigerant into liquid refrigerant.

[0031] After absorbing heat, the cooling fluid is transported to the cooling tower 2 through the first pipeline 4 to be cooled again; the liquid refrigerant is transported to the terminal heat exchange device 3 through the second pipeline 5 to cool the room.

[0032] The refrigeration system disclosed in the present invention utilizes a phase-change refrigerant solution by arranging a centralized cooling tower 2 on the roof, a phase-change circulation device 1, and a terminal heat exchange device 3. The liquid refrigerant needs to absorb a large amount of heat during the conversion to a gaseous refrigerant, so the refrigeration system can achieve the effect of cooling the room. Due to the strong cooling capacity of the phase-change refrigerant, the refrigeration system is suitable for high-rise buildings and can improve the energy efficiency of the refrigeration system to meet the PUE requirements. In addition, during the refrigeration process, the refrigerant circulates and converts between the liquid and gaseous states, so the refrigerant can also be recycled.

[0033] In one example, the first pipeline 4 and the second pipeline 5 can be made of metal pipes such as steel pipes and copper pipes, or can be made of corrosion-resistant polymer materials such as Teflon pipes. If metal pipes are used, the inner wall of the metal pipe is provided with an anti-corrosion coating to prevent the corrosive fluid from corroding the inner wall of the pipe.

[0034] like Figure 2 As shown, the phase change circulation device 1 includes a heat exchanger 11, an air pump 12 and a liquid pump 13. In one example, the heat exchanger 11 is a shell and tube heat exchanger 11. The tubes of the heat exchanger 11 flow with cold fluid, and the shell of the heat exchanger 11 flows with hot fluid. The cold fluid and the hot fluid exchange heat in the heat exchanger 11. The cross-sectional view of the heat exchanger 11 is shown in FIG. Figure 3 As shown, the heat exchanger 11 includes a first inlet 111, a first outlet 112, a second inlet 113, and a second outlet 114. The cooling fluid output from the cooling tower 2 enters the heat exchanger 11 through the first inlet 111. After absorbing heat in the heat exchanger 11, the cooling fluid is output through the first outlet 112 and then enters the cooling tower 2. The liquid refrigerant in the heat exchanger 11 enters the terminal heat exchange device 3 through the second inlet 113. After absorbing heat in the terminal heat exchange device 3, the liquid refrigerant vaporizes into gaseous refrigerant. The gaseous refrigerant is output through the second outlet 114 and then enters the heat exchanger 11 to be cooled again into liquid refrigerant.

[0035] The air pump 12 and liquid pump 13 are used to transport refrigerant. The refrigerant can be a phase-change fluid such as R134a, Freon, hydrocarbons, ammonia, or the like. The present disclosure does not limit the type of refrigerant. Because refrigerants are corrosive and can easily damage the air pump 12 and liquid pump 13, both are fluorine pumps. Because the lining of these pumps is fluoroplastic, which is corrosion-resistant, these pumps can be used to transport a variety of corrosive fluids.

[0036] like Figure 2 As shown, the second pipeline 5 includes a liquid pipe section 51 and a gas pipe section 52. One end of the liquid pipe section 51 is connected to the second outlet 114 of the heat exchanger 11, and the other end is connected to the terminal heat exchange device 3. One end of the gas pipe section 52 is connected to the second inlet 113 of the heat exchanger 11, and the other end is connected to the terminal heat exchange device 3.

[0037] like Figure 2 As shown, the air pump 12 is disposed in the air pipe section 52 of the second pipeline 5 and is located between the heat exchanger 11 and the terminal heat exchange device 3. The air pump 12 transports the gaseous refrigerant in the terminal heat exchange device 3 to the heat exchanger 11 through the air pipe section 52 of the second pipeline 5. The liquid pump 13 is disposed in the liquid pipe section 51 of the second pipeline 5 and is located between the heat exchanger 11 and the terminal heat exchange device 3. The liquid pump 13 transports the liquid refrigerant in the heat exchanger 11 to the terminal heat exchange device 3 through the liquid pipe section 51 of the second pipeline 5. After heat exchange with the terminal heat exchange device 3, the liquid refrigerant is converted into gaseous refrigerant. The gaseous refrigerant enters the heat exchanger 11 through the air pipe section 52 of the second pipeline 5. In the heat exchanger 11, the gaseous refrigerant exchanges heat with the heat exchange fluid and is converted back into liquid, thus completing the phase change cycle of the refrigerant.

[0038] In one example, the cooling fluid in the cooling tower 2 is cooling water, and the cooling tower 2 is centrally installed on the roof of a high-rise building. In order to increase the heat exchange rate between the cooling water and the air, multiple cooling towers 2 can be installed on the roof of the high-rise building. The cooling tower 2 can be an open cooling tower or a closed cooling tower, and the present disclosure does not limit this. Figure 4As shown, the cooling tower 2 and the heat exchanger 11 are connected via a first pipe 4. A water pump 21 provides power for the cooling water. The water pump 21 is arranged between the cooling tower 2 and the heat exchanger 11. After the water pump 21 is started, the cooling water flows out through the outlet of the cooling tower 2 into the first pipe 4. Then, it is transported through the first pipe 4 and enters the pipe of the heat exchanger 11 through the first inlet 111 of the heat exchanger 11. After the cooling water absorbs heat from the gaseous refrigerant in the heat exchanger 11, a small portion of the cooling water evaporates into water vapor. The remaining cooling water absorbs heat and is converted into hot water after the temperature rises. The water vapor and hot water flow out through the first outlet 112 of the heat exchanger 11 and are transported through the first pipe 4 and enter the cooling tower 2 through the inlet. The water vapor and hot water exchange heat with the outdoor air in the cooling tower 2 and are cooled again into cooling water. Since the cooling water in the cooling tower 2 will evaporate less, it is necessary to regularly replenish the cooling water in the cooling tower 2.

[0039] In one example, the cooling fluid in the cooling tower 2 may also be a phase change fluid, such as Figure 5 As shown, the cooling tower 2 and the heat exchanger 11 are connected via a first pipeline 4. A fluid pump 22 provides power for the phase-change fluid, and the fluid pump 22 is disposed between the cooling tower 2 and the heat exchanger 11. After the fluid pump 22 is activated, the phase-change fluid flows out through the outlet of the cooling tower 2 into the first pipeline 4. It is then transported through the first pipeline 4 and enters the heat exchanger 11 through the first inlet 111. In the heat exchanger 11, the phase-change fluid absorbs heat from the gaseous refrigerant and transforms from a liquid to a gas. The gaseous phase-change fluid flows out through the first outlet 112 of the heat exchanger 11 and is then transported through the first pipeline 4 into the cooling tower 2. After exchanging heat in the cooling tower 2, the gaseous phase-change fluid transforms from a gas to a liquid again.

[0040] In one example, when the terminal heat exchange device 3 outputs the gaseous refrigerant, the gaseous refrigerant will be mixed with impurities such as dust in the room. In order to prevent the impurities contained in the gaseous refrigerant from damaging the air pump 12 and affecting the operation of the air pump 12, such as Figure 2 As shown, a filter 14 is provided in the air pipe section 52 of the second pipeline 5. The filter 14 is located between the air pump 12 and the terminal heat exchange device 3. After the gaseous refrigerant is filtered by the filter 14, impurities such as dust are filtered by the filter 14. The filtered gaseous refrigerant enters the air pump 12 and is transported to the shell of the heat exchanger 11.

[0041] Since the gaseous refrigerant is converted into liquid refrigerant after heat exchange in the heat exchanger 11, after the liquid pump 13 is started, the liquid pump 13 will transport the liquid refrigerant to the heat exchange end. If the liquid pump 13 is turned off and other devices in the refrigeration system are still operating normally, the liquid refrigerant in the heat exchanger 11 will be continuously discharged, causing the liquid refrigerant to accumulate in the second pipeline 5, thereby causing the pressure in the second pipeline 5 to be too high and expand, or the liquid refrigerant to flow back to the heat exchanger 11. Figure 2 As shown, a liquid storage tank 15 is provided in the liquid pipe section 51 of the second pipeline 5 . The liquid storage tank 15 is located between the heat exchanger 11 and the liquid pump 13 . The liquid storage tank 15 can store excess liquid refrigerant.

[0042] In one example, if Figure 2 As shown, the liquid pipe section 51 of the second pipeline 5 is provided with a valve 16 . The valve 16 is located between the liquid pump 13 and the terminal heat exchange device 3 . The valve 16 is provided to adjust the flow rate of the liquid refrigerant.

[0043] In one example, if Figure 2 As shown, the terminal heat exchange device 3 includes an evaporator 31 and a compressor 32. The input end of the compressor 32 is connected to the evaporator 31, and the output end of the compressor 32 is connected to the heat exchanger 11. The liquid refrigerant in the heat exchanger 11 is transported to the evaporator 31 through the second pipeline 5. The liquid refrigerant absorbs heat in the evaporator 31 and vaporizes into a gaseous refrigerant. After being sucked into the compressor 32, the gaseous refrigerant is converted into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heat exchanger 11 and is cooled again into a liquid refrigerant.

[0044] In one example, the evaporator 31 can adopt a wind wall or backplate heat exchanger. The backplate heat exchanger can adopt a traditional copper tube aluminum fin heat exchanger 11 or a microchannel heat exchanger 11 in the field of automotive air conditioning. The present disclosure does not limit the specific form of the evaporator 31.

[0045] The evaporator 31 is described by taking the back plate heat exchanger as an example. Figure 6 As shown, the evaporator 31 includes multiple heat exchange backplates 311. The presence of multiple heat exchange backplates 311 helps improve the evaporation efficiency of the liquid refrigerant. A liquid supply coil 312 is provided on the heat exchange backplates 311. The liquid supply coil 312 is connected to the liquid inlet of the heat exchange backplates 311 and is arranged in a spiral or arched shape. This shape increases the surface area of ​​the liquid supply coil 312, allowing the liquid refrigerant to absorb more heat, thereby improving the indoor cooling effect.

[0046] like Figure 6As shown, a flow valve 313 is provided between the liquid inlet of the heat exchange backplate 311 and the liquid supply coil 312. Flow valve 313 is used to regulate the flow of liquid refrigerant. The liquid refrigerant is powered by liquid pump 13 and transported to the liquid inlet of the heat exchange backplate 311. It is then throttled by flow valve 313 and enters the liquid supply coil 312. The liquid refrigerant then absorbs heat and evaporates into gaseous refrigerant. Flow valve 313 uses an electronic expansion valve, which has the characteristic of fast regulation response. To facilitate control of the electronic expansion valve, a temperature sensor 314 is also provided on the evaporator 31. Temperature sensor 314 is electrically connected to the electronic expansion valve. The electronic expansion valve adjusts its opening according to the temperature collected by temperature sensor 314, thereby regulating the flow of liquid refrigerant.

[0047] In one example, a wet-bulb thermometer is installed outdoors to measure the outdoor wet-bulb temperature. The wet-bulb thermometer is fixed to the roof of a high-rise building. When the outdoor wet-bulb temperature is lower than the indoor supply air temperature, compressor 32 is bypassed and the refrigeration system adopts natural cooling mode. When the outdoor wet-bulb temperature is higher than the indoor supply air temperature, compressor 32 is turned on and the refrigeration system adopts mechanical cooling mode. For example, in winter when the outdoor temperature is low, the refrigeration system adopts natural cooling mode, while in summer when the outdoor temperature is high, the refrigeration system adopts mechanical cooling mode.

[0048] In one example, compressor 32 is an oil-free compressor. This refers to a compressor 32 that does not use lubricating oil within its cylinders. Since no lubricating oil comes into contact with the compressed gas source during operation, the exhaust gas is oil-free. The use of an oil-free compressor avoids the problem of oil return from compressor 32 affecting the cooling system, thereby improving the cooling efficiency of the phase-change refrigeration system.

[0049] According to an embodiment of the present disclosure, the present disclosure also provides a refrigeration method of a phase change refrigeration system, such as Figure 7 As shown, the method includes:

[0050] Step S101: The cooling tower transports the cooling fluid to the phase change circulation device through the first pipeline, so that the cooling fluid absorbs heat in the phase change circulation device to convert the gaseous refrigerant into liquid refrigerant. The cooling fluid after absorbing the heat is transported to the cooling tower through the first pipeline for further cooling.

[0051] Step S102: The phase change circulation device transports the liquid refrigerant to the terminal heat exchange device through the second pipeline, so that the liquid refrigerant absorbs heat in the terminal heat exchange device and changes from liquid to gas to cool the room; the gaseous refrigerant is transported to the phase change circulation device through the second pipeline, so that the gaseous refrigerant is cooled into liquid refrigerant in the phase change circulation device.

[0052] The refrigeration method of the phase change refrigeration system disclosed herein utilizes the phase change of the refrigerant to cool the interior of a building. During the refrigeration process, the refrigerant circulates and transforms between the liquid and gaseous states, thereby realizing the recycling of the refrigerant. In addition, the conversion of the liquid refrigerant into the gaseous refrigerant requires the absorption of a large amount of heat. Therefore, more heat in the room is absorbed by the liquid refrigerant, and the indoor temperature is lowered, thereby improving the refrigeration effect. In this way, energy consumption can be reduced during the refrigeration process to meet the PUE requirements.

[0053] In one example, the phase change circulation device includes: a heat exchanger, an air pump, and a liquid pump;

[0054] The phase change circulation device transports the liquid refrigerant to the terminal heat exchange device through the second pipeline, comprising: the liquid pump transports the liquid refrigerant in the heat exchanger to the terminal heat exchange device through the second pipeline;

[0055] The terminal heat exchange device transports the gaseous refrigerant to the phase change cycle device through the second pipeline, including: the air pump transports the gaseous refrigerant in the terminal heat exchange device to the heat exchanger through the second pipeline.

[0056] The refrigerant is converted from gas to liquid in the phase change cycle device, realizing the recycling of the refrigerant.

[0057] In one example, the cooling fluid in the cooling tower is cooling water, and the cooling tower provides power for the cooling water through a water pump;

[0058] The water pump transports the cooling water in the cooling tower to the heat exchanger through the first pipeline. After the cooling water absorbs the heat of the gaseous refrigerant, it is transported to the cooling tower through the first pipeline for further cooling.

[0059] In one example, the cooling fluid in the cooling tower is a phase-change fluid, and the cooling tower provides power for the phase-change fluid through a fluid pump;

[0060] The fluid pump transports the phase-change fluid in the cooling tower to the heat exchanger through the first pipeline. After the phase-change fluid absorbs heat from the gaseous refrigerant in the heat exchanger, it is converted from liquid to gas. The phase-change fluid after absorbing heat is transported to the cooling tower through the first pipeline for further cooling. The phase-change fluid is converted from gas to liquid in the cooling tower.

[0061] In one example, the terminal heat exchange device includes: an evaporator and a compressor, the input end of the compressor is connected to the evaporator, and the output end of the compressor is connected to the heat exchanger;

[0062] The liquid refrigerant is transported to the evaporator through the second pipeline, and the liquid refrigerant absorbs heat in the evaporator and is vaporized into gaseous refrigerant;

[0063] The gaseous refrigerant is processed by the compressor and then enters the heat exchanger to be cooled into liquid refrigerant.

[0064] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not a limitation herein.

[0065] The above specific embodiments do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure shall be included within the scope of protection of this disclosure.

Claims

1. A phase change refrigeration system, comprising: Phase change circulation device, cooling tower centrally installed on the roof and terminal heat exchange device installed inside the house; The phase change circulation device is connected to the cooling tower via a first pipeline, and the phase change circulation device is connected to the terminal heat exchange device via a second pipeline; The cooling fluid in the cooling tower is transmitted to the phase change circulation device through the first pipeline, and the cooling fluid absorbs heat from the gaseous refrigerant in the phase change circulation device to convert the gaseous refrigerant into liquid refrigerant; After absorbing heat, the cooling fluid is transported to the cooling tower through the first pipeline for further cooling; The liquid refrigerant is transported to the terminal heat exchange device through the second pipeline to cool the room; The terminal heat exchange device includes an evaporator, which includes multiple heat exchange back plates. A liquid supply coil is provided on the heat exchange back plate. The liquid supply coil is connected to the liquid inlet of the heat exchange back plate, and the liquid supply coil is spirally or arched.

2. The system according to claim 1, wherein: The phase change circulation device includes: a heat exchanger, an air pump and a liquid pump; The air pump is disposed between the heat exchanger and the terminal heat exchange device, and the air pump transports the gaseous refrigerant in the terminal heat exchange device to the heat exchanger through the second pipeline; The liquid pump is arranged between the heat exchanger and the terminal heat exchange device, and the liquid pump transports the liquid refrigerant in the heat exchanger to the terminal heat exchange device through a second pipeline.

3. The system according to claim 2, wherein: The second pipeline is provided with a filter, which is used to filter impurities in the gaseous refrigerant. The filter is located between the air pump and the terminal heat exchange device.

4. The system according to claim 3, wherein: A valve is provided on the second pipeline, and the valve is used to adjust the flow rate of the liquid refrigerant. The valve is located between the liquid pump and the terminal heat exchange device.

5. The system according to claim 3, wherein: The second pipeline is provided with a liquid storage tank, which is used to store the liquid refrigerant. The liquid storage tank is located between the heat exchanger and the liquid pump.

6. The system according to claim 3, wherein: The cooling fluid in the cooling tower is cooling water, and the cooling tower provides power for the cooling water through a water pump; The water pump transports the cooling water in the cooling tower to the heat exchanger through the first pipeline. After the cooling water absorbs the heat of the gaseous refrigerant, it is transported to the cooling tower through the first pipeline for further cooling.

7. The system according to claim 3, wherein: The cooling fluid in the cooling tower is a phase-change fluid, and the cooling tower provides power for the phase-change fluid through a fluid pump; The fluid pump transports the phase-change fluid in the cooling tower to the heat exchanger through the first pipeline. After the phase-change fluid absorbs heat from the gaseous refrigerant in the heat exchanger, it is converted from liquid to gas. The phase-change fluid after absorbing heat is transported to the cooling tower through the first pipeline for further cooling. The phase-change fluid is converted from gas to liquid in the cooling tower.

8. The system according to claim 6 or 7, wherein: The terminal heat exchange device includes: an evaporator and a compressor, the input end of the compressor is connected to the evaporator, and the output end of the compressor is connected to the heat exchanger; The liquid refrigerant is transported to the evaporator through the second pipeline, and the liquid refrigerant absorbs heat in the evaporator and is vaporized into gaseous refrigerant; The gaseous refrigerant is processed by the compressor and then enters the heat exchanger to be cooled into liquid refrigerant.

9. The system according to claim 8, wherein: A throttle valve is provided in the evaporator, and the throttle valve is used to adjust the flow rate of the liquid refrigerant.

10. A refrigeration method for a phase change refrigeration system, the method comprising: The cooling tower transports the cooling fluid to the phase change circulation device through the first pipeline, so that the cooling fluid absorbs heat in the phase change circulation device to convert the gaseous refrigerant into liquid refrigerant, and the cooling fluid after absorbing the heat is transported to the cooling tower through the first pipeline for further cooling; The phase change circulation device transports the liquid refrigerant to the terminal heat exchange device through the second pipeline, so that the liquid refrigerant absorbs heat in the terminal heat exchange device and changes from liquid to gas to cool the room; the gaseous refrigerant is transported to the phase change circulation device through the second pipeline, so that the gaseous refrigerant is cooled into liquid refrigerant in the phase change circulation device.

11. The method according to claim 10, wherein: The phase change circulation device includes: a heat exchanger, an air pump and a liquid pump; The phase change circulation device transports the liquid refrigerant to the terminal heat exchange device through the second pipeline, comprising: the liquid pump transports the liquid refrigerant in the heat exchanger to the terminal heat exchange device through the second pipeline; The terminal heat exchange device transports the gaseous refrigerant to the phase change cycle device through the second pipeline, including: the air pump transports the gaseous refrigerant in the terminal heat exchange device to the heat exchanger through the second pipeline.

12. The method according to claim 11, wherein The cooling fluid in the cooling tower is cooling water, and the cooling tower provides power for the cooling water through a water pump; The water pump transports the cooling water in the cooling tower to the heat exchanger through the first pipeline. After the cooling water absorbs the heat of the gaseous refrigerant, it is transported to the cooling tower through the first pipeline for further cooling.

13. The method according to claim 11, wherein The cooling fluid in the cooling tower is a phase-change fluid, and the cooling tower provides power for the phase-change fluid through a fluid pump; The fluid pump transports the phase-change fluid in the cooling tower to the heat exchanger through the first pipeline. After the phase-change fluid absorbs heat from the gaseous refrigerant in the heat exchanger, it is converted from liquid to gas. The phase-change fluid after absorbing heat is transported to the cooling tower through the first pipeline for further cooling. The phase-change fluid is converted from gas to liquid in the cooling tower.

14. The method according to claim 12 or 13, wherein: The terminal heat exchange device includes: an evaporator and a compressor, the input end of the compressor is connected to the evaporator, and the output end of the compressor is connected to the heat exchanger; The liquid refrigerant is transported to the evaporator through the second pipeline, and the liquid refrigerant absorbs heat in the evaporator and is vaporized into gaseous refrigerant; The gaseous refrigerant is processed by the compressor and then enters the heat exchanger to be cooled into liquid refrigerant.

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