Falling film type indirect liquid cooling system

Abstract

The utility model relates to a falling film type indirect liquid cooling system which comprises a cooling tower, a cooling pump, a plate heat exchanger, a freezing pump, a negative pressure hot gas condensation treatment liquid storage tank, a falling film type indirect liquid cooling unit and a controller, the liquid inlet end of the falling film type indirect liquid cooling module communicates with a liquid outlet of the freezing pump, a liquid inlet of the freezing pump communicates with a hot end outlet of the plate heat exchanger, and a hot end inlet of the plate heat exchanger communicates with a liquid outlet of the negative pressure hot gas condensation treatment liquid storage tank. A gas inlet of the negative pressure hot gas condensation treatment liquid storage tank is communicated with a gas outlet end of the falling film type indirect liquid cooling module, a cold end inlet of the plate heat exchanger is communicated with a liquid outlet of the cooling pump, a liquid inlet of the cooling pump is communicated with a liquid outlet of the cooling tower, and a liquid inlet of the cooling tower is communicated with a cold end outlet of the plate heat exchanger. The whole result is simple, water is used for replacing electronic fluorinated liquid to serve as a liquid cooling working medium, and the problem of liquid leakage can be effectively solved.

Description

A falling film indirect liquid cooling system Technical Field

[0001] This utility model relates to the field of evaporative cooling systems, specifically to a falling film indirect liquid cooling system. Background Technology

[0002] As data volumes increase and data center density rises, data center temperatures also gradually increase. Therefore, data center cooling and energy saving have become a primary focus. Currently, commonly used cold plate and immersion liquid cooling technologies can address the challenges of high-power server racks to some extent. However, cold plate liquid cooling requires rigorous design of complex liquid cooling channels, such as serpentine or leaf vein-shaped channels, which require topology optimization to significantly improve performance. Furthermore, immersion liquid cooling typically uses electronic fluorinated liquids, resulting in large quantities, high costs, and significant system size and weight. Leakage issues also pose safety concerns, limiting its widespread adoption. Summary of the Invention

[0003] To overcome the shortcomings of existing products and technologies, this utility model provides a falling film indirect liquid cooling system, which can adopt different operating modes according to different ambient temperatures, making full use of natural cold sources. At the same time, its overall structure is relatively simple. Compared with immersion liquid cooling, it uses less liquid cooling medium and uses water instead of electronic fluorinated liquid as the liquid cooling medium, which is green and energy-saving. Furthermore, since the secondary side is under negative pressure, it can effectively solve the leakage problem and promote the deployment of computer rooms more quickly.

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

[0005] A falling film indirect liquid cooling system is applied to a data center computer room, including a cooling tower, a cooling pump, a plate heat exchanger, a chilled pump, a negative pressure hot gas condensation treatment storage tank, a falling film indirect liquid cooling unit, and a controller. The falling film indirect liquid cooling unit includes multiple falling film indirect liquid cooling modules. The falling film indirect liquid cooling modules are spaced apart from the server groups in the data center computer room, and the outer wall of the falling film indirect liquid cooling module and the outer shell of the server groups in the data center computer room transfer heat through close contact.

[0006] The inlet of the falling film indirect liquid cooling module is connected to the outlet of the refrigeration pump via a pipe. The inlet of the refrigeration pump is connected to the hot end outlet of the plate heat exchanger via a pipe. The hot end inlet of the plate heat exchanger is connected to the outlet of the negative pressure hot gas condensation treatment storage tank via a pipe. The air inlet of the negative pressure hot gas condensation treatment storage tank is connected to the air outlet of the falling film indirect liquid cooling module via a pipe. The cold end inlet of the plate heat exchanger is connected to the outlet of the cooling pump via a pipe. The inlet of the cooling pump is connected to the outlet of the cooling tower via a pipe. The inlet of the cooling tower is connected to the cold end outlet of the plate heat exchanger via a pipe.

[0007] The cooling tower, the cooling pump, the refrigeration pump, the negative pressure hot gas condensation treatment storage tank, and the controller are electrically connected.

[0008] Preferably, the falling film indirect liquid cooling module includes a housing and a water distributor, nozzles, and a water film located inside the housing. The water distributor is located at the upper part of the housing, the nozzles are located on both sides of the water distributor and directly above the water film, the water film is located on both sides inside the housing and contacts the inner wall of the housing, the water distributor is connected to the outlet of the refrigeration pump through a pipe, and the space between the water films is connected to the air inlet of the negative pressure hot gas condensation treatment storage tank through a pipe.

[0009] Preferably, the negative pressure hot gas condensation treatment liquid storage tank includes an electric exhaust valve, a vacuum pump, an electric regulating valve, a liquid storage tank, and a sprayer. The sprayer is located at the top of the liquid storage tank and is connected to the outlet of the refrigeration pump via a pipe. One end of the electric regulating valve is connected to the first air outlet of the liquid storage tank via a pipe, and the other end of the electric regulating valve is connected to the air inlet of the vacuum pump via a pipe. The air outlet of the vacuum pump is connected to one end of the electric exhaust valve via a pipe, and one end of the electric exhaust valve is also connected to the second air outlet of the liquid storage tank. The other end of the electric exhaust valve is connected to the external environment. The air inlet of the liquid storage tank is connected to the space between the water film via a pipe, and the liquid outlet of the liquid storage tank is connected to the hot end inlet of the plate heat exchanger via a pipe. The electric exhaust valve, the vacuum pump, the electric regulating valve, and the controller are electrically connected.

[0010] Preferably, the cooling tower includes a tower body and a heat exchange coil, a fan, and a pre-cooling module located within the tower body. The fan is located at the air outlet of the tower body, the pre-cooling module is located behind the air inlet of the tower body, the heat exchange coil is located behind the pre-cooling module, the liquid inlet of the heat exchange coil is connected to the cold end outlet of the plate heat exchanger via a pipe, the liquid outlet of the heat exchange coil is connected to the liquid inlet of the cooling pump via a pipe, and the fan is electrically connected to the controller.

[0011] Preferably, the precooling module includes a shower, packing material, a water receiving tank, and a precooling pump. The shower is located above the packing material, the water receiving tank is located below the packing material, the inlet of the precooling pump is connected to the water receiving tank through a pipe, and the outlet of the precooling pump is connected to the shower through a pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] By installing a cooling tower, natural cooling is used to supply the cold source; by installing a plate heat exchanger, the cooling tower's cold source is used to exchange heat with the server in the computer room; by installing a falling film indirect liquid cooling module, water is used as the liquid cooling medium, and the heat absorption and evaporation of water is used to cool the server, thus solving the potential problems caused by leakage of fluorinated liquid as the working medium; by installing a negative pressure hot gas condensation treatment storage tank, the problem of transporting the hot gas formed after water evaporation is solved, and at the same time, the low-temperature cold water in the shower in the storage tank exchanges heat with the hot gas to cool it down, providing part of the water replenishment. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the principle of a falling film indirect liquid cooling system of this utility model in non-low temperature seasons;

[0015] Figure 2 is a schematic diagram of the operating principle of a falling film indirect liquid cooling system of this utility model in low temperature season;

[0016] Figure 3 is a schematic diagram of the principle of a falling film indirect liquid cooling module in a falling film indirect liquid cooling system of this utility model.

[0017] 10. Cooling tower; 11. Heat exchange coil; 12. Fan; 13. Sprayer; 14. Packing; 15. Water receiving tank; 16. Precooling pump; 20. Cooling pump; 30. Plate heat exchanger; 40. Refrigeration pump; 50. Negative pressure hot gas condensate treatment liquid storage tank; 51. Electric exhaust valve; 52. Vacuum pump; 53. Electric regulating valve; 54. Liquid storage tank; 55. Sprayer; 60. Falling film indirect liquid cooling module; 61. Shell; 62. Water distributor; 63. Nozzle; 64. Water film; 70. Server group. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Figure 1 shows a schematic diagram of the operation principle of a falling film indirect liquid cooling system according to this invention during non-low temperature seasons. The falling film indirect liquid cooling system, applied in a data center server room, includes a cooling tower 10, a cooling pump 20, a plate heat exchanger 30, a chilled pump 40, a negative pressure hot gas condensation treatment storage tank 50, a falling film indirect liquid cooling unit, and a controller. The falling film indirect liquid cooling unit includes multiple falling film indirect liquid cooling modules 60. These modules are spaced apart from server groups 70 in the data center server room. The outer wall of the falling film indirect liquid cooling module 60 and the outer shell of the server group 70 in the data center server room transfer heat through close contact. The liquid inlet of the falling film indirect liquid cooling module 60 is connected to the liquid outlet of the chilled pump 40 via a pipe. The inlet of the chilled pump 40 is connected to the hot end outlet of the plate heat exchanger 30 via a pipe. The hot end inlet of the plate heat exchanger 30 is connected to the outlet of the negative pressure hot gas condensation treatment storage tank 50 via a pipe. The air inlet of the negative pressure hot gas condensation treatment storage tank 50 is connected to the air outlet of the falling film indirect liquid cooling module 60 via a pipe. The cold end inlet of the plate heat exchanger 30 is connected to the outlet of the cooling pump 20 via a pipe. The inlet of the cooling pump 20 is connected to the outlet of the cooling tower 10 via a pipe. The inlet of the cooling tower 10 is connected to the cold end outlet of the plate heat exchanger 30 via a pipe. The cooling tower 10, the cooling pump 20, the chilled pump 40, the negative pressure hot gas condensation treatment storage tank 50, and the controller are electrically connected.

[0022] The liquid cooling system of this invention is mainly used in data center computer rooms. It uses a falling film indirect liquid cooling module to cool the servers in the computer room. The heat from the servers is cooled by contact with the falling film indirect liquid cooling module. The falling film indirect liquid cooling module cools the heat transferred by spraying cold air onto the wet film, and the wet film cools the heat transferred by contacting the outer wall, thereby achieving the cooling of the server group. In the falling film indirect liquid cooling module, the water vapor that absorbs heat and evaporates is drawn into the negative pressure hot gas condensation storage tank. Because the internal space of the falling film indirect liquid cooling module is under negative pressure, the air pressure inside the falling film indirect liquid cooling module is much lower than the air pressure inside the falling film indirect liquid cooling module, causing the water vapor that has absorbed heat and evaporated to be forced back into the negative pressure hot gas condensation storage tank. Inside the negative pressure hot gas condensation storage tank, the high-temperature water vapor is cooled by heat exchange through the internal cooling water source, thereby achieving condensation. The condensed water, along with the room temperature water in the module, is sent to the plate heat exchanger to exchange heat with the low-temperature cooling water delivered by the cooling tower for cooling. The cooled water is then sent back to the falling film indirect liquid cooling module by the chilled water pump, and the cycle continues.

[0023] This system consists of a cooling tower that provides a cold source, a plate heat exchanger that provides heat exchange, a falling film indirect liquid cooling module that uses low-temperature cooling water to cool the server, a negative pressure hot gas condensation treatment liquid storage tank that provides power for the water vapor heated by heat exchange and condensation, and a controller that controls the switching operation of each component. The entire system is controlled by the controller to shut down the switches of each component according to the ambient temperature, so that the system operates in a suitable mode.

[0024] Regarding how the falling film indirect liquid cooling module cools the server group, preferably as shown in Figure 3, Figure 3 is a schematic diagram of the principle of the falling film indirect liquid cooling module of the present invention; the falling film indirect liquid cooling module 60 includes a shell 61 and a water distributor 62, nozzles 63 and water film 64 located inside the shell. The water distributor 62 is located at the upper part of the shell 61, the nozzles 63 are located on both sides of the water distributor 62 and directly above the water film 64, the water film 64 is located on both sides inside the shell 61 and contacts the inner wall of the shell 61, the water distributor 62 is connected to the outlet of the chilled pump 40 through a pipe, and the space between the water films 64 is connected to the air inlet of the negative pressure hot gas condensation treatment storage tank 50 through a pipe.

[0025] Low-temperature cooling water is delivered to the water distributor via a chilled pump. Nozzles are installed on both sides of the water distributor to spray the low-temperature cooling water into fine particles. The sprayed water is sprayed onto the outside and the water film, absorbing the heat emitted by the server unit, heating up and evaporating. The evaporator is then pumped away by a negative pressure hot gas condensation tank.

[0026] Regarding how to achieve negative pressure and how to condense water vapor in a negative pressure hot gas condensation treatment storage tank, preferably, the negative pressure hot gas condensation treatment storage tank 50 includes an electric exhaust valve 51, a vacuum pump 52, an electric regulating valve 53, a storage tank 54, and a sprayer 55. The sprayer 55 is located above the storage tank 54 and is connected to the outlet of the refrigeration pump 40 through a pipe. One end of the electric regulating valve 53 is connected to the first air outlet of the storage tank 54 through a pipe, and the other end of the electric regulating valve 53 is connected to the vacuum pump 54 through a pipe. The air inlet of the vacuum pump 52 is connected to the air outlet of the vacuum pump 52, which is connected to one end of the electric exhaust valve 51 through a pipe. One end of the electric exhaust valve 51 is also connected to the second air outlet of the liquid storage tank 54. The other end of the electric exhaust valve 51 is connected to the external environment. The air inlet of the liquid storage tank 54 is connected to the space between the water film 64 through a pipe. The liquid outlet of the liquid storage tank 54 is connected to the hot end inlet of the plate heat exchanger 30 through a pipe. The electric exhaust valve 51, the vacuum pump 52, the electric regulating valve 53 are electrically connected to the controller.

[0027] The vacuum pump, electric exhaust valve, and electric regulating valve are activated. The vacuum pump expels air from the storage tank into the outside air, creating a vacuum in the storage tank. Once this vacuum is achieved, the vacuum pump, electric exhaust valve, and electric regulating valve are closed. When water vapor from the falling film indirect liquid cooling module is delivered to the storage tank, the air pressure gradually increases. The vacuum pump, electric exhaust valve, and electric regulating valve reopen, causing the air pressure to gradually decrease, creating a stable pressure difference. This allows the water vapor from the falling film indirect liquid cooling module to be delivered to the storage tank at a stable flow rate. In the storage tank, a distributor sprays low-temperature cooling water onto the tank, cooling and condensing the high-temperature water vapor. Some of the condensed water vapor is stored as liquid in the storage tank. This lowers the temperature of the cooling water in the storage tank and increases the water replenishment volume, thus reducing the amount of water needed to replenish the tank as the water volume gradually decreases after the water vapor is discharged.

[0028] Regarding how the cooling tower utilizes natural cooling to provide a cold source, preferably, the cooling tower includes a tower body and a heat exchange coil 11, a fan 12, and a pre-cooling module located within the tower body. The fan 12 is located at the air outlet of the tower body, the pre-cooling module is located behind the air inlet of the tower body, the heat exchange coil 11 is located behind the pre-cooling module, the liquid inlet of the heat exchange coil 11 is connected to the cold end outlet of the plate heat exchanger 30 through a pipe, the liquid outlet of the heat exchange coil 11 is connected to the liquid inlet of the cooling pump 20 through a pipe, and the fan 12 is electrically connected to the controller.

[0029] The high-temperature cooling water in the heat exchange coils of the cooling tower exchanges heat with the cold air outside and then is cooled down. It is then pumped by the cooling pump to the plate heat exchanger to exchange heat with the high-temperature cooling water in the storage tank. The cooled water is then returned to the heat exchange coils after being heated up. This cycle continues, and the cooling tower continuously provides a cold source to the plate heat exchanger.

[0030] To further reduce the temperature of the cooling water in the cooling tower, preferably, the precooling module includes a distributor 13, packing material 14, a water receiving tank 15, and a precooling pump 16. The distributor 13 is located above the packing material 14, the water receiving tank 15 is located below the packing material 14, the inlet of the precooling pump 16 is connected to the water receiving tank 15 through a pipe, and the outlet of the precooling pump 16 is connected to the distributor 13 through a pipe.

[0031] By setting packing material in front of the heat exchange coil and spraying cooling water on the packing material, outside air enters the packing material and evaporates with the cooling water to cool down. This results in lower-temperature air exchanging heat with the higher-temperature cooling water in the heat exchange coil, resulting in lower-temperature cooling water flowing into the water receiving tank. The pre-cooling pump then delivers the low-temperature cooling water from the water receiving tank to the water distributor, and the cycle continues.

[0032] As shown in Figure 2, Figure 2 is a schematic diagram of the operation principle of a falling film indirect liquid cooling system of this utility model in the low temperature season; in the low temperature season, the control precooling pump is turned off, the precooling module does not run, and the external cold air directly enters the heat exchange coil to exchange heat with the cooling water in the heat exchange coil.

[0033] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0034] By installing a cooling tower, natural cooling is used to supply the cold source; by installing a plate heat exchanger, the cooling tower's cold source is used to exchange heat with the server in the computer room; by installing a falling film indirect liquid cooling module, water is used as the liquid cooling medium, and the heat absorption and evaporation of water is used to cool the server, thus solving the potential problems caused by leakage of fluorinated liquid as the working medium; by installing a negative pressure hot gas condensation treatment storage tank, the problem of transporting the hot gas formed after water evaporation is solved, and at the same time, the low-temperature cold water in the shower in the storage tank exchanges heat with the hot gas to cool it down, providing part of the water replenishment.

[0035] 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.

[0036] 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 falling film indirect liquid cooling system, applied in a data center server room, characterized in that, The system includes a cooling tower, a cooling pump, a plate heat exchanger, a chilled water pump, a negative pressure hot gas condensation treatment storage tank, a falling film indirect liquid cooling unit, and a controller. The falling film indirect liquid cooling unit comprises multiple falling film indirect liquid cooling modules. These modules are spaced apart from the server groups in the data center server room, and heat transfer occurs through close contact between the outer wall of the falling film indirect liquid cooling module and the outer shell of the server groups. The liquid inlet of each falling film indirect liquid cooling module is connected to the outlet of the chilled water pump via a pipe, and the inlet of the chilled water pump is connected to the hot end outlet of the plate heat exchanger via a pipe. The hot end inlet of the plate heat exchanger is connected to the outlet of the negative pressure hot gas condensation treatment liquid storage tank via a pipe. The air inlet of the negative pressure hot gas condensation treatment liquid storage tank is connected to the air outlet of the falling film indirect liquid cooling module via a pipe. The cold end inlet of the plate heat exchanger is connected to the outlet of the cooling pump via a pipe. The inlet of the cooling pump is connected to the outlet of the cooling tower via a pipe. The inlet of the cooling tower is connected to the cold end outlet of the plate heat exchanger via a pipe. The cooling tower, the cooling pump, the refrigeration pump, the negative pressure hot gas condensation treatment liquid storage tank, and the controller are electrically connected.

2. The falling film indirect liquid cooling system according to claim 1, characterized in that, The falling film indirect liquid cooling module includes a housing and a water distributor, nozzles, and a water film located inside the housing. The water distributor is located at the top of the housing, and the nozzles are located on both sides of the water distributor and directly above the water film. The water film is located on both sides inside the housing and contacts the inner wall of the housing. The water distributor is connected to the outlet of the refrigeration pump through a pipe, and the space between the water films is connected to the air inlet of the negative pressure hot gas condensation treatment storage tank through a pipe.

3. The falling film indirect liquid cooling system according to claim 2, characterized in that, The negative pressure hot gas condensation treatment liquid storage tank includes an electric exhaust valve, a vacuum pump, an electric regulating valve, a liquid storage tank, and a sprayer. The sprayer is located at the top of the liquid storage tank and is connected to the outlet of the refrigeration pump via a pipe. One end of the electric regulating valve is connected to the first air outlet of the liquid storage tank via a pipe, and the other end of the electric regulating valve is connected to the air inlet of the vacuum pump via a pipe. The air outlet of the vacuum pump is connected to one end of the electric exhaust valve via a pipe, and one end of the electric exhaust valve is also connected to the second air outlet of the liquid storage tank. The other end of the electric exhaust valve is connected to the external environment. The air inlet of the liquid storage tank is connected to the space between the water film via a pipe, and the liquid outlet of the liquid storage tank is connected to the hot end inlet of the plate heat exchanger via a pipe. The electric exhaust valve, the vacuum pump, the electric regulating valve, and the controller are electrically connected.

4. The falling film indirect liquid cooling system according to claim 3, characterized in that, The cooling tower includes a tower body and heat exchange coils, a fan, and a pre-cooling module located within the tower body. The fan is located at the air outlet of the tower body, the pre-cooling module is located behind the air inlet of the tower body, the heat exchange coils are located behind the pre-cooling module, the liquid inlet of the heat exchange coils is connected to the cold end outlet of the plate heat exchanger via a pipe, the liquid outlet of the heat exchange coils is connected to the liquid inlet of the cooling pump via a pipe, and the fan is electrically connected to the controller.

5. The falling film indirect liquid cooling system according to claim 4, characterized in that, The precooling module includes a water distributor, packing material, a water receiving tank, and a precooling pump. The water distributor is located above the packing material, and the water receiving tank is located below the packing material. The inlet of the precooling pump is connected to the water receiving tank through a pipe, and the outlet of the precooling pump is connected to the water distributor through a pipe.

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