Phase change immersion liquid cooling system

Abstract

The utility model relates to a phase change immersion liquid cooling system, which comprises an immersion liquid cooling cabinet, a floor heating unit, a natural cooling unit, a cooling-water machine cooling unit, a plate heat exchanger, a liquid cooling working medium circulating pump, a cooling water circulating pump, a first electric valve, a second electric valve, a third electric valve and a controller, the air outlet end of the immersed liquid cooling cabinet is communicated with one end of the first electric valve, one end of the second electric valve and one end of the third electric valve through pipelines. The first electric valve, the second electric valve, the third electric valve, the liquid cooling working medium circulating pump, the cooling water circulating pump and the cooling-water machine cooling unit are electrically connected with the controller. According to the environment temperature and the liquid cooling working medium temperature, different operation modes can be intelligently switched and adopted, and a floor heating cold source and a natural cold source are fully utilized to cooperate with a mechanical cold supplementing mode to jointly form the multifunctional phase change immersion liquid cooling system.

Description

Technical Field

[0001] This utility model relates to the field of evaporative cooling systems and control, specifically to a phase change immersion liquid cooling system. Background Technology

[0002] As data volumes increase and data center density rises, so too does the temperature within data centers. This necessitates a liquid cooling system with high heat exchange efficiency. Immersion liquid cooling systems offer advantages such as a large heat exchange contact surface and thorough heat exchange. The return water temperature of immersion liquid cooling systems can reach a high temperature of 60°C. However, this heat is often dissipated into the atmosphere through cooling towers or dry coolers, resulting in wasted resources. Therefore, a liquid cooling system is needed that maximizes resource utilization while also considering the utilization rate of natural cold sources to reduce the overall PUE of the data center, embodying the design philosophy of energy conservation, low carbon emissions, green efficiency, and high performance. Utility Model Content

[0003] In order to overcome the shortcomings of existing products and technologies, this utility model provides a phase change immersion liquid cooling system, which can intelligently switch to different operating modes according to the ambient temperature and the temperature of the liquid cooling medium. It makes full use of the underfloor heating cold source and natural cold source, and coordinates with mechanical cooling methods to form a multi-functional phase change immersion liquid cooling system.

[0004] The technical solution of this utility model embodiment is as follows:

[0005] A phase change immersion liquid cooling system includes an immersion liquid cooling cabinet, a floor heating unit, a natural cooling unit, a chiller cooling unit, a plate heat exchanger, a liquid cooling working fluid circulation pump, a cooling water circulation pump, a first electric valve, a second electric valve, a third electric valve, and a controller. The air outlet of the immersion liquid cooling cabinet is connected to one end of the first electric valve, the second electric valve, and the third electric valve through a pipe.

[0006] The other end of the first electric valve is connected to the hot end inlet of the plate heat exchanger through a pipe, the hot end outlet of the plate heat exchanger is connected to the liquid inlet of the immersion liquid cooling cabinet through a pipe, the cold end inlet of the plate heat exchanger is connected to the water outlet of the underfloor heating unit through a pipe, and the cold end outlet of the plate heat exchanger is connected to the water inlet of the underfloor heating unit through a pipe.

[0007] The other end of the second electric valve is connected to the air inlet of the natural cooling unit through a pipe, the liquid outlet of the natural cooling unit is connected to the liquid inlet of the liquid-cooled working fluid circulation pump through a pipe, and the liquid outlet of the liquid-cooled working fluid circulation pump is connected to the liquid inlet of the immersion liquid-cooled cabinet through a pipe.

[0008] The other end of the third electric valve is connected to the inlet of the evaporation heat exchange end of the chiller cooling unit through a pipe, and the outlet of the evaporation heat exchange end of the chiller cooling unit is connected to the liquid inlet of the immersion liquid chiller cabinet through a pipe.

[0009] The cooling water outlet of the natural cooling unit is connected to the inlet of the cooling water circulation pump through a pipe, the outlet of the cooling water circulation pump is connected to the condenser heat exchanger inlet of the chiller cooling unit through a pipe, and the condenser heat exchanger outlet of the chiller cooling unit is connected to the cooling water inlet of the natural cooling unit through a pipe.

[0010] The first electric valve, the second electric valve, the third electric valve, the liquid cooling working fluid circulation pump, the cooling water circulation pump, the chiller cooling unit, and the controller are electrically connected.

[0011] Preferably, the underfloor heating unit includes an underfloor heating circulation pump and a radiant heat dissipation coil. The outlet of the radiant heat dissipation coil is connected to the inlet of the underfloor heating circulation pump via a pipe. The outlet of the underfloor heating circulation pump is connected to the cold end inlet of the plate heat exchanger via a pipe. The cold end outlet of the plate heat exchanger is connected to the inlet of the radiant heat dissipation coil via a pipe.

[0012] Preferably, the natural cooling unit includes a tower body, packing material, a water receiving tank, a heat exchange coil, a water distributor, and a fan. The fan is located at the top air outlet of the tower body, the packing material is located at the air inlet of the tower body, the water distributor is located above the packing material, the water receiving tank is located below the packing material, the heat exchange coil is located directly behind the packing material, the air inlet of the heat exchange coil is connected to one end of the second electric valve through a pipe, the liquid outlet of the heat exchange coil is connected to the liquid inlet of the liquid-cooled working fluid circulation pump through a pipe, the water outlet of the water receiving tank is connected to the water inlet of the cooling water circulation pump through a pipe, and the water inlet of the water distributor is connected to the condensation heat exchange outlet of the chiller cooling unit through a pipe.

[0013] Preferably, the chiller cooling unit includes a low-pressure-ratio compressor, an evaporative heat exchanger, a condenser heat exchanger, and a throttling device. The outlet of the low-pressure-ratio compressor is connected to the inlet of the condenser heat exchanger via a copper pipe. The liquid outlet of the condenser heat exchanger is connected to one end of the throttling device via a copper pipe. The other end of the throttling device is connected to the liquid inlet of the evaporative heat exchanger via a copper pipe. The outlet of the evaporative heat exchanger is connected to the inlet of the low-pressure-ratio compressor via a copper pipe. The condenser heat exchanger inlet is connected to the outlet of the cooling water circulation pump via a pipe. The condenser heat exchanger outlet is connected to the inlet of the water distributor via a pipe. The evaporative heat exchanger inlet is connected to one end of the third electric valve via a pipe. The evaporative heat exchanger outlet is connected to the liquid inlet of the immersion liquid chiller cabinet via a pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] By installing a plate heat exchanger and connecting it to the underfloor heating system, the system utilizes the low-temperature natural water from the underfloor heating system as a cold source to cool and condense the high-temperature gaseous working fluid during the winter season. Simultaneously, the heat from the high-temperature gaseous working fluid is transferred to the underfloor heating system, achieving heating and saving energy. A cooling tower is installed to supplement the underfloor heating system with a cold source in winter, jointly cooling and condensing the high-temperature liquid working fluid. During the transitional season, it serves as the primary cold source for cooling and condensing the high-temperature liquid working fluid. In summer, it acts as an additional auxiliary cold source for mechanical refrigeration, further cooling and condensing the high-temperature liquid working fluid. A chiller unit ensures the temperature of the liquid working fluid entering the cabinet. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the principle of a phase change immersion liquid cooling system according to the present invention. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the principle of a phase change immersion liquid cooling system according to the present invention. Figure 2 ;

[0018] 10. Immersion liquid-cooled cabinet; 20. Underfloor heating unit; 21. First electric valve; 22. Underfloor heating circulation pump; 23. Radiant heat dissipation coil; 30. Natural cooling unit; 31. Second electric valve; 32. Packing; 33. Water receiving tank; 34. Heat exchange coil; 35. Water distributor; 36. Fan; 40. Chiller cooling unit; 41. Third electric valve; 42. Low-pressure ratio compressor; 43. Evaporative heat exchanger; 44. Condensing heat exchanger; 45. Throttling device; 50. Plate heat exchanger; 60. Liquid-cooled working fluid circulation pump; 70. Cooling water circulation pump. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] like Figure 1 , Figure 2 As shown, Figure 1 This is a schematic diagram of the principle of a phase change immersion liquid cooling system according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the principle of a phase change immersion liquid cooling system according to the present invention. Figure 2 A phase change immersion liquid cooling system includes an immersion liquid cooling cabinet 10, a floor heating unit 20, a natural cooling unit 30, a chiller cooling unit 40, a plate heat exchanger 50, a liquid cooling working fluid circulation pump 60, a cooling water circulation pump 70, a first electric valve 21, a second electric valve 31, a third electric valve 41, and a controller. The air outlet of the immersion liquid cooling cabinet 10 is connected to one end of the first electric valve 21, the second electric valve 31, and the third electric valve 41 via a pipe. The other end of the first electric valve 21 is connected to the hot end inlet of the plate heat exchanger 50 via a pipe. The hot end outlet of the plate heat exchanger 50 is connected to the liquid inlet of the immersion liquid cooling cabinet 10 via a pipe. The cold end inlet of the plate heat exchanger 50 is connected to the water outlet of the floor heating unit 20 via a pipe. The cold end outlet of the plate heat exchanger 50 is connected to the water inlet of the floor heating unit 20 via a pipe.

[0023] The other end of the second electric valve 31 is connected to the air inlet of the natural cooling unit 30 via a pipe; the liquid outlet of the natural cooling unit 30 is connected to the liquid inlet of the liquid-cooled working fluid circulation pump 60 via a pipe; the liquid outlet of the liquid-cooled working fluid circulation pump 60 is connected to the liquid inlet of the submerged liquid-cooled cabinet 10 via a pipe; the other end of the third electric valve 41 is connected to the evaporation heat exchange inlet of the chiller cooling unit 40 via a pipe; the evaporation heat exchange outlet of the chiller cooling unit 40 is connected to the liquid inlet of the submerged liquid-cooled cabinet 10 via a pipe; The cooling water outlet of the natural cooling unit 30 is connected to the inlet of the cooling water circulation pump 70 via a pipe. The outlet of the cooling water circulation pump 70 is connected to the condenser heat exchange inlet of the chiller cooling unit 40 via a pipe. The condenser heat exchange outlet of the chiller cooling unit 40 is connected to the cooling water inlet of the natural cooling unit 30 via a pipe. The first electric valve 21, the second electric valve 31, the third electric valve 41, the liquid cooling working fluid circulation pump 60, the cooling water circulation pump 70, the chiller cooling unit 40, and the controller are electrically connected.

[0024] The phase change immersion liquid cooling system of this utility model has three sources of cold water: one is the natural cold water source from the underfloor heating system in low-temperature seasons, another is the natural cooling source, and the third is the energy-consuming mechanical refrigeration source from the chiller system. This system controls and switches between these three cold sources according to the ambient temperature and the required temperature of the cabinet. Underfloor heating systems are used to heat enclosed spaces during cold seasons. They typically operate at 5°C or below and remain off above 5°C. Natural cooling sources are usually indirect evaporation modules, which generally operate above 5°C. Below 5°C, their operation depends on the temperature of the liquid coolant entering the cabinet. Chiller cooling units, being the most power-consuming devices, typically operate at 25°C or above. Below 25°C, their operation depends on the temperature of the liquid coolant entering the cabinet. Underfloor heating systems can both cool the cabinets and provide heating for enclosed spaces using the heat from the cabinets. However, they are only suitable for cold seasons. During warmer transitional seasons, natural cooling units are needed to cool the cabinets using ambient cooling, thus saving energy. Chiller cooling units, as a last resort to maintain cabinet temperature, only operate when the liquid coolant in the cabinet is above the required level, sharing some of the heat with the natural cooling units.

[0025] The underfloor heating unit exchanges heat with the gaseous liquid cooling medium through a plate heat exchanger. The system controller opens the first electric valve and closes the second and third electric valves based on the ambient temperature. This allows all the gaseous liquid cooling medium in the liquid-cooled cabinet to be transported to the plate heat exchanger, where it condenses into liquid. The liquid cooling medium is then circulated back to the cabinet by a liquid cooling medium circulation pump. If the liquid cooling medium temperature is detected as too high during operation, the second electric valve and the cooling water circulation pump are activated, and the natural cooling unit is started to supplement the cold source and cool the gaseous liquid cooling medium until it reaches the required temperature for the cabinet. When the ambient temperature exceeds a certain level, the underfloor heating system shuts down, the first electric valve closes, the second electric valve opens, and the natural cooling unit is used for heat exchange and cooling. If the liquid cooling medium temperature is detected as too high during operation, the third electric valve and the chiller system are activated, and the chiller system is started to supplement the cold source and cool the gaseous liquid cooling medium until it reaches the required temperature for the cabinet. The controller controls the on / off state and flow opening degree of each valve and functional device to ensure stable operation of the entire system.

[0026] The liquid cooling medium is placed in the liquid-cooled cabinet, and the server is immersed in it. When the server is running, it dissipates a large amount of heat. The liquid cooling medium absorbs heat and changes phase into gas, becoming a high-temperature gaseous liquid cooling medium.

[0027] Regarding the specific heat exchange between the underfloor heating unit and the liquid cooling system, preferably, the underfloor heating unit 20 includes an underfloor heating circulation pump 22 and a radiant heat dissipation coil 23. The outlet of the radiant heat dissipation coil 23 is connected to the inlet of the underfloor heating circulation pump 22 through a pipe. The outlet of the underfloor heating circulation pump 22 is connected to the cold end inlet of the plate heat exchanger 50 through a pipe. The cold end outlet of the plate heat exchanger 50 is connected to the inlet of the radiant heat dissipation coil 23 through a pipe.

[0028] Underfloor heating systems primarily release heat through radiant heat exchange coils. A circulating pump transports cold water from the radiant heat exchange coils to a plate heat exchanger, where it exchanges heat with a high-temperature gaseous liquid working fluid to raise its temperature before being transported back to the radiant heat exchange coils for radiant heat dissipation. After cooling down, the water is then transported back to the plate heat exchanger, and the cycle continues.

[0029] For the natural cooling unit to achieve natural cooling, preferably, the natural cooling unit 30 includes a tower body, packing material 32, water receiving tank 33, heat exchange coil 34, water distributor 35, and fan 36. The fan 36 is located at the top air outlet of the tower body, the packing material 32 is located at the air inlet of the tower body, the water distributor 35 is located above the packing material 32, the water receiving tank 33 is located below the packing material 32, the heat exchange coil 34 is located directly behind the packing material 32, the air inlet of the heat exchange coil 34 is connected to one end of the second electric valve 31 through a pipe, the liquid outlet of the heat exchange coil 34 is connected to the liquid inlet of the liquid-cooled working fluid circulation pump 60 through a pipe, the water outlet of the water receiving tank 33 is connected to the water inlet of the cooling water circulation pump 70 through a pipe, and the water inlet of the water distributor 35 is connected to the condensation heat exchange outlet of the chiller cooling unit 40 through a pipe.

[0030] The natural cooling unit is mainly an indirect evaporative cooling tower. External natural air is drawn into the tower through the air inlet by a fan, and undergoes an isenthalpic process with the cooling water in the packing. The cooling water and the external natural air are cooled down. The high-temperature cooling water flows into the water receiving tank after cooling down, and is then pumped by the cooling circulation pump to the water distributor, which distributes it in the packing. This cycle continues. After the external natural air is cooled down, it exchanges heat with the heat exchange coils placed inside. The high-temperature gaseous liquid cooling medium in the heat exchange coils is cooled down and condensed into liquid cooling medium, which is then transported to the liquid cooling cabinet by the liquid cooling medium circulation pump. This cycle continues.

[0031] Preferably, the chiller cooling unit 40 includes a low-pressure-ratio compressor 42, an evaporator heat exchanger 43, a condenser heat exchanger 44, and a throttling device 45. The outlet of the low-pressure-ratio compressor 42 is connected to the inlet of the condenser heat exchanger 44 via a copper pipe. The outlet of the condenser heat exchanger 44 is connected to one end of the throttling device 45 via a copper pipe. The other end of the throttling device 45 is connected to the inlet of the evaporator heat exchanger 43 via a copper pipe. The outlet of the evaporator heat exchanger 43 is connected to the inlet of the evaporator heat exchanger 44 via a copper pipe. The air inlet of the low-pressure-ratio compressor 42 is connected, the condensing heat exchanger 44 inlet is connected to the cooling water circulation pump 70 outlet via a pipe, the condensing heat exchanger 44 outlet is connected to the water distributor 35 inlet via a pipe, the evaporating heat exchanger 43 inlet is connected to one end of the third electric valve 41 via a pipe, and the evaporating heat exchanger 43 outlet is connected to the immersion liquid cooling cabinet 10 liquid inlet via a pipe.

[0032] A chiller mainly consists of an evaporative heat exchanger, a low-pressure-ratio compressor, a condenser heat exchanger, and a throttling device. A typical compressor has a compression ratio above 2.0, while a low-pressure-ratio compressor has a wider adjustment range; under low-temperature conditions, the compression ratio can approach 1.0. In this case, the compressor does no work and only functions as a refrigerant pump.

[0033] In the chiller's condenser heat exchanger, the high-temperature refrigerant is cooled by the cooling water source of the cooling tower, while the evaporator heat exchanger cools and condenses the incoming gaseous liquid working fluid.

[0034] The evaporative heat exchanger absorbs heat from the high-temperature gaseous working fluid, causing the internal medium to evaporate into a gaseous state. This gas is then compressed by a low-pressure compressor to perform work. The condensing heat exchanger circulates and exchanges heat with the cooling water in the cooling tower, condensing it into a liquid state. The liquid is then throttled and depressurized by a throttling device and transported back to the evaporative heat exchanger. Meanwhile, the high-temperature gaseous working fluid on the liquid cooling cabinet side releases heat and transforms into a liquid working fluid, returning to the inlet of the liquid cooling cabinet.

[0035] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0036] By installing a plate heat exchanger and connecting it to the underfloor heating system, the system utilizes the low-temperature natural water from the underfloor heating system as a cold source to cool and condense the high-temperature gaseous working fluid during the winter season. Simultaneously, the heat from the high-temperature gaseous working fluid is transferred to the underfloor heating system, achieving heating and saving energy. A cooling tower is installed to supplement the underfloor heating system with a cold source in winter, jointly cooling and condensing the high-temperature liquid working fluid. During the transitional season, it serves as the primary cold source for cooling and condensing the high-temperature liquid working fluid. In summer, it acts as an additional auxiliary cold source for mechanical refrigeration, further cooling and condensing the high-temperature liquid working fluid. A chiller unit ensures the temperature of the liquid working fluid entering the cabinet.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A phase change immersion liquid cooling system, characterized in that, comprising an immersion liquid cooling cabinet, a floor heating unit, a natural cooling unit, a water chiller cooling unit, a plate heat exchanger, a liquid cooling working medium circulating pump, a cooling water circulating pump, a first electric valve, a second electric valve, a third electric valve and a controller, the gas outlet end of the immersion liquid cooling cabinet is communicated with one end of the first electric valve, the second electric valve and the third electric valve through a pipeline; the other end of the first electric valve is communicated with the hot end inlet of the plate heat exchanger through a pipeline, the hot end outlet of the plate heat exchanger is communicated with the liquid inlet end of the immersion liquid cooling cabinet through a pipeline, the cold end inlet of the plate heat exchanger is communicated with the water outlet end of the floor heating unit through a pipeline, and the cold end outlet of the plate heat exchanger is communicated with the water inlet end of the floor heating unit through a pipeline; the other end of the second electric valve is communicated with the gas inlet end of the natural cooling unit through a pipeline, the liquid outlet end of the natural cooling unit is communicated with the liquid inlet end of the liquid cooling working medium circulating pump through a pipeline, and the liquid outlet end of the liquid cooling working medium circulating pump is communicated with the liquid inlet end of the immersion liquid cooling cabinet through a pipeline; the other end of the third electric valve is communicated with the evaporation heat exchange end inlet of the water chiller cooling unit through a pipeline, and the evaporation heat exchange end outlet of the water chiller cooling unit is communicated with the liquid inlet end of the immersion liquid cooling cabinet through a pipeline; the cooling water outlet of the natural cooling unit is communicated with the water inlet end of the cooling water circulating pump through a pipeline, the water outlet end of the cooling water circulating pump is communicated with the condensation heat exchange end inlet of the water chiller cooling unit through a pipeline, and the condensation heat exchange end outlet of the water chiller cooling unit is communicated with the cooling water inlet of the natural cooling unit through a pipeline; the first electric valve, the second electric valve, the third electric valve, the liquid cooling working medium circulating pump, the cooling water circulating pump, the water chiller cooling unit and the controller are electrically connected.

2. The phase change immersion liquid cooling system according to claim 1, characterized in that, the floor heating unit comprises a floor heating circulating pump and a radiant heat dissipation coil, the water outlet of the radiant heat dissipation coil is communicated with the water inlet of the floor heating circulating pump through a pipeline, the water outlet end of the floor heating circulating pump is communicated with the cold end inlet of the plate heat exchanger through a pipeline, and the cold end outlet of the plate heat exchanger is communicated with the water inlet of the radiant heat dissipation coil through a pipeline.

3. The phase change immersion liquid cooling system according to claim 2, characterized in that, The natural cooling unit comprises a tower body, a filler, a water collecting tank, a heat exchange coil, a water distributor and a fan, the fan is located at the top air outlet of the tower body, the filler is located at the air inlet of the tower body, the water distributor is located above the filler, the water collecting tank is located below the filler, the heat exchange coil is located directly behind the filler, the air inlet of the heat exchange coil is communicated with one end of the second electric valve through a pipeline, the liquid outlet of the heat exchange coil is communicated with the liquid inlet end of the liquid cooling working medium circulating pump through a pipeline, the water outlet of the water collecting tank is communicated with the water inlet of the cooling water circulating pump through a pipeline, and the water inlet of the water distributor is communicated with the condensation heat exchange end outlet of the water chiller cooling unit through a pipeline.

4. The phase change immersion liquid cooling system according to claim 3, characterized in that, The water chiller cooling unit comprises a small pressure ratio compressor, an evaporation heat exchanger, a condensation heat exchanger and a throttling device, the gas outlet end of the small pressure ratio compressor is communicated with the gas inlet end of the condensation heat exchanger through a copper pipe, the liquid outlet end of the condensation heat exchanger is communicated with one end of the throttling device through a copper pipe, the other end of the throttling device is communicated with the liquid inlet end of the evaporation heat exchanger through a copper pipe, the gas outlet end of the evaporation heat exchanger is communicated with the gas inlet end of the small pressure ratio compressor through a copper pipe, the condensation heat exchange end inlet of the condensation heat exchanger is communicated with the water outlet end of the cooling water circulating pump through a pipeline, the condensation heat exchange end outlet of the condensation heat exchanger is communicated with the water inlet of the water distributor through a pipeline, the evaporation heat exchange end inlet of the evaporation heat exchanger is communicated with one end of the third electric valve through a pipeline, and the evaporation heat exchange end outlet of the evaporation heat exchanger is communicated with the liquid inlet end of the immersion liquid cooling cabinet through a pipeline.

Images