Immersion cooling system and immersion cooling method

Abstract

This invention provides an immersion cooling system comprising a cooling tank, a housing, and a valve. The cooling tank is configured to contain coolant and an electronic device immersed in the coolant. The housing covers one side of the cooling tank to form an enclosed space. The valve has two ports respectively communicating with the enclosed space and the portion of the cooling tank above the coolant, and the valve is configured to open in response to the air pressure in the cooling tank exceeding an upper limit.

Description

Technical Field

[0001] This disclosure relates to an immersion cooling system and an immersion cooling method. Background Technology

[0002] Generally, when immersion cooling systems are used to dissipate heat from electronic devices, the pressure of the immersion cooling system varies with the load on the electronic devices. Excessive system pressure raises the boiling point of the coolant, hindering heat dissipation, while insufficient system pressure allows outside air or moisture to seep in. Furthermore, both excessively high and low system pressures can cause structural damage or deformation to the system. Therefore, controlling the pressure of the immersion cooling system is a crucial issue. Summary of the Invention

[0003] In view of this, one objective of this disclosure is to propose an immersion cooling system that can effectively control system pressure.

[0004] To achieve the above objectives, according to some embodiments disclosed herein, an immersion cooling system includes a cooling tank, a housing, and a first valve. The cooling tank is configured to contain coolant and electronic devices immersed in the coolant. The housing covers one side of the cooling tank to form an enclosed space. The first valve has two ports respectively communicating with the enclosed space and the portion of the cooling tank above the coolant, and the first valve is configured to open in response to the air pressure in the cooling tank exceeding a first upper limit value.

[0005] In one or more embodiments disclosed herein, the immersion cooling system further includes a pressure sensor and a controller. The pressure sensor is configured to provide a sensing signal that displays the air pressure in the cooling tank. The controller is configured to determine, based on the sensing signal, whether the air pressure in the cooling tank exceeds a first upper limit value, and to actuate a first valve when the air pressure in the cooling tank exceeds the first upper limit value.

[0006] In one or more embodiments disclosed herein, the immersion cooling system further includes a safety valve. The safety valve has two ports respectively communicating with an enclosed space and a portion of the cooling tank above the coolant, and is configured to automatically open when the air pressure in the cooling tank exceeds a second upper limit value. The second upper limit value is greater than a first upper limit value.

[0007] In one or more embodiments disclosed herein, the immersion cooling system further includes a condenser and a recovery line. The condenser is disposed in an enclosed space and configured to condense the vaporized coolant in the enclosed space. The recovery line connects the enclosed space and the cooling tank and is configured to guide the coolant condensed by the condenser into the cooling tank.

[0008] In one or more embodiments disclosed herein, the immersion cooling system further includes a condenser. The condenser is disposed in a cooling tank and configured to perform a condensation operation, which includes condensing vaporized coolant. When the first valve is closed, the condenser is configured to accelerate or decelerate the condensation operation as the pressure in the cooling tank changes.

[0009] In one or more embodiments disclosed herein, the immersion cooling system further includes an expansion device communicating with the portion of the cooling tank above the coolant. When the first valve is closed, the expansion device is configured to change volume in response to changes in the air pressure within the cooling tank.

[0010] In one or more embodiments disclosed herein, the immersion cooling system further includes a condenser. The condenser is configured to condense vapor flowing toward the expansion device when the pressure in the cooling tank exceeds a threshold value. The threshold value is less than a first upper limit value.

[0011] In one or more embodiments disclosed herein, the immersion cooling system further includes a second valve. The second valve has two ports respectively communicating with the cooling tank and the surrounding environment located outside the cooling tank and the housing, and the second valve is configured to open in response to the air pressure in the cooling tank falling below a certain limit.

[0012] According to some embodiments disclosed herein, an immersion cooling method includes: immersing an electronic device in a coolant in a cooling tank; providing a housing that covers one side of the cooling tank to form an enclosed space; and opening a first valve in response to the air pressure in the cooling tank exceeding a first upper limit value, allowing gas to flow from the cooling tank to the enclosed space.

[0013] In one or more embodiments disclosed herein, the step of opening the first valve includes: receiving a sensing signal from a pressure sensor, the sensing signal displaying the air pressure of the cooling tank; determining, based on the sensing signal, whether the air pressure of the cooling tank exceeds a first upper limit value; and if the determination result is yes, driving the first valve to open.

[0014] In one or more embodiments disclosed herein, the immersion cooling method further includes: providing a safety valve having two ports respectively communicating with an enclosed space and a portion of the cooling tank above the coolant, and the safety valve being configured to automatically open when the air pressure in the cooling tank exceeds a second upper limit value, wherein the second upper limit value is greater than a first upper limit value.

[0015] In one or more embodiments disclosed herein, the immersion cooling method further includes: condensing the vaporized coolant in the enclosed space; and guiding the condensed coolant in the enclosed space into a cooling tank.

[0016] In one or more embodiments disclosed herein, the immersion cooling method further includes: opening a second valve in response to the air pressure in the cooling tank being lower than a lower limit, so that gas flows from the surrounding environment located outside the cooling tank and the housing to the cooling tank.

[0017] In one or more embodiments disclosed herein, the immersion cooling method further includes: controlling the air pressure of the cooling tank using a first condenser located in the cooling tank or an expansion device connected to the cooling tank before opening the first valve.

[0018] In one or more embodiments disclosed herein, the immersion cooling method further includes: when the gas pressure in the cooling tank exceeds a threshold value, using a second condenser to condense at least a portion of the vapor flowing from the cooling tank to the expansion device. The threshold value is less than a first upper limit value.

[0019] In summary, in the immersion cooling system disclosed herein, when the internal pressure of the cooling tank is too high, the gas in the cooling tank is discharged into a closed space located on one side of the cooling tank instead of being directly discharged into the atmosphere. In this way, the loss of vaporized coolant can be avoided. The vaporized coolant collected in the closed space can be recycled back into the cooling tank for reuse. Attached Figure Description

[0020] To make the above and other objects, features, advantages and embodiments disclosed herein more apparent and understandable, the accompanying drawings are described below:

[0021] Figure 1 A schematic diagram illustrating an immersion cooling system according to an embodiment of this disclosure;

[0022] Figure 2 A flowchart illustrating an immersion cooling method according to an embodiment of this disclosure is provided.

[0023] Figure 3 A flowchart illustrating an immersion cooling method according to another embodiment of this disclosure is provided.

[0024] Explanation of icon numbers:

[0025] 10: Immersion Cooling System

[0026] 11: Delivery pipeline

[0027] 13: Filter

[0028] 15: Flow meter

[0029] 17,77: Check valve

[0030] 20: Cooling tank

[0031] 30: Coolant

[0032] 35: Vaporized coolant

[0033] 41, 42, 72: Condenser

[0034] 50: Casing

[0035] 56: Enclosed space

[0036] 61, 63: Valves

[0037] 62: Safety valve

[0038] 64: Flow control valve

[0039] 70: Recycling System

[0040] 74: Recycling Pipeline

[0041] 80: Controller

[0042] 90: Expansion device

[0043] 100, 200: Immersion cooling method

[0044] 101,102,103,104,201,202: Steps

[0045] E: Electronic devices

[0046] PT01, PT02: Pressure sensors Detailed Implementation

[0047] To make the description of this disclosure more detailed and complete, reference may be made to the accompanying drawings and the various embodiments described below. The components in the drawings are not drawn to scale and are provided for illustrative purposes only. Many practical details are described below to provide a comprehensive understanding of this disclosure; however, those skilled in the art will understand that this disclosure may be practiced without one or more of these practical details, and therefore, such details should not be used to limit this disclosure.

[0048] Please refer to Figure 1 The immersion cooling system 10 includes a cooling tank 20 configured to contain a coolant 30 and one or more electronic devices E immersed in the coolant 30. The electronic devices E are, for example, computer servers or data storage devices that generate heat during operation. The coolant 30 is configured to contact the electronic devices E and absorb heat from them to assist in cooling the electronic devices E. The coolant 30 is a non-conductive liquid, such as a dielectric fluid.

[0049] like Figure 1As shown, in some embodiments, the coolant 30 in the cooling tank 20 absorbs heat from the electronic device E and partially vaporizes, with the portion of the cooling tank 20 above the coolant 30 containing the vaporized coolant 35. The immersion cooling system 10 further includes a condenser 41 disposed in the cooling tank 20 and configured to perform a condensation operation, which includes condensing the vaporized coolant 35. In the above-described two-phase cooling method, the coolant 30 repeatedly absorbs heat from the electronic device E to vaporize and is converted back to a liquid state by the condenser 41, thereby assisting in the heat dissipation of the electronic device E.

[0050] Generally, the air pressure inside the cooling tank 20 is positively correlated with the load of the electronic device E. Specifically, when the load of the electronic device E increases (e.g., when the computational load of the electronic device E increases), the electronic device E generates more heat per unit time, causing the coolant 30 to vaporize more quickly, thus increasing the air pressure in the cooling tank 20. Conversely, when the load of the electronic device E decreases, the electronic device E generates less heat per unit time, causing the vaporization of the coolant 30 to slow down, thus decreasing the air pressure in the cooling tank 20.

[0051] like Figure 1 As shown, the immersion cooling system 10 also includes a housing 50. The housing 50 covers one side of the cooling tank 20 to form an enclosed space 56 having a fixed volume. In the illustrated embodiment, the housing 50 covers the top of the cooling tank 20. In some embodiments, the housing 50 may comprise metal, glass, acrylic, other suitable materials, or any combination of the above materials.

[0052] like Figure 1 As shown, the immersion cooling system 10 also includes a valve 61. The valve 61 has two ports respectively communicating with the enclosed space 56 and the portion of the cooling tank 20 located above the coolant 30 (i.e., the space in the cooling tank 20 containing vaporized coolant 35). The valve 61 is configured to switch between an open and a closed state. When the valve 61 is in the open state, it allows gas to flow between the enclosed space 56 and the cooling tank 20. When the valve 61 is in the closed state, it prevents gas from flowing between the enclosed space 56 and the cooling tank 20.

[0053] As described above, valve 61 is configured to open when the air pressure in the cooling tank 20 exceeds a first upper limit, allowing gas to flow from the cooling tank 20 to the enclosed space 56, thereby reducing the air pressure in the cooling tank 20. This prevents structural damage to the cooling tank 20 and avoids excessively high boiling points in the coolant 30, which could lead to poor heat dissipation in the electronic device E. The gas flowing from the cooling tank 20 to the enclosed space 56 contains vaporized coolant 35, and may also contain other gases mixed with the vaporized coolant 35, such as air or water vapor.

[0054] In the immersion cooling system 10 disclosed herein, when the internal air pressure of the cooling tank 20 is too high, the gas in the cooling tank 20 is discharged into a closed space 56 located on one side of the cooling tank 20 instead of being directly discharged into the atmosphere. In this way, the loss of vaporized coolant 35 can be avoided. The vaporized coolant 35 collected in the closed space 56 can be recycled back into the cooling tank 20 for reuse.

[0055] like Figure 1 As shown, in some embodiments, the immersion cooling system 10 further includes a recovery system 70, which includes a condenser 72 and a recovery conduit 74. The condenser 72 is disposed in an enclosed space 56 and configured to condense the vaporized coolant 35 in the enclosed space 56. The recovery conduit 74 has two opposing ends, one connected to the enclosed space 56 and the other connected to the cooling tank 20. The recovery conduit 74 is configured to guide the coolant 30 condensed by the condenser 72 into the cooling tank 20. In some embodiments, the recovery conduit 74 includes a check valve 77, which is configured to prevent the coolant 30 or the vaporized coolant 35 from flowing back from the cooling tank 20 into the enclosed space 56.

[0056] like Figure 1 As shown, in some embodiments, the immersion cooling system 10 further includes a pressure sensor PT02 and a controller 80. The pressure sensor PT02 is configured to provide a sensing signal indicating the air pressure of the cooling tank 20. The controller 80 is communicatively connected to the pressure sensor PT02 and configured to receive the sensing signal from the pressure sensor PT02. The controller 80 is also configured to determine, based on the sensing signal, whether the air pressure of the cooling tank 20 exceeds a first upper limit. If the air pressure of the cooling tank 20 exceeds the first upper limit, the controller 80 actuates valve 61 (e.g., the controller 80 may send a control signal to actuate valve 61). In some embodiments, valve 61 is a solenoid valve. In some embodiments, the pressure sensor PT02 is configured to measure the air pressure difference between the cooling tank 20 and the enclosed space 56.

[0057] like Figure 1As shown, in some embodiments, the immersion cooling system 10 further includes a safety valve 62. The safety valve 62 has two ports respectively connected to the enclosed space 56 and the portion of the cooling tank 20 located above the coolant 30. The safety valve 62 is configured to automatically open when the gas pressure in the cooling tank 20 exceeds a second upper limit value, which is greater than a first upper limit value. In this way, when the gas pressure in the cooling tank 20 further increases, the gas in the cooling tank 20 can be discharged into the enclosed space 56 more quickly. Furthermore, the safety valve 62 also improves the reliability of the pressure control mechanism of the immersion cooling system 10; even if the valve 61 fails, the gas in the cooling tank 20 can still be discharged into the enclosed space 56 through the safety valve 62. In some embodiments, the valve 61 and the safety valve 62 are disposed in a pipeline, one end of which is connected to the cooling tank 20 and extends into the enclosed space 56.

[0058] like Figure 1 As shown, in some embodiments, the immersion cooling system 10 further includes a valve 63, which has two ports respectively connected to the cooling tank 20 and the surrounding environment outside the cooling tank 20 and the housing 50, and the valve 63 is configured to open in response to the air pressure in the cooling tank 20 falling below a certain limit. In this way, when the air pressure inside the cooling tank 20 is too low, ambient air can be introduced into the cooling tank 20 to increase the air pressure in the cooling tank 20 and prevent damage to the structure of the cooling tank 20.

[0059] In some embodiments, valve 63 is a solenoid valve. In some embodiments, controller 80 is configured to determine whether the air pressure in cooling tank 20 is below a lower limit based on a sensing signal provided by pressure sensor PT02, and to drive valve 63 to open when the air pressure in cooling tank 20 is below the lower limit (e.g., controller 80 may send a control signal to drive valve 63 to open). When the air pressure in cooling tank 20 is not below the lower limit, valve 63 is closed.

[0060] In some embodiments, when the air pressure in the cooling tank 20 does not exceed a first upper limit and does not fall below a lower limit, the immersion cooling system 10 can implement other pressure control measures to maintain the air pressure in the cooling tank 20. For example... Figure 1 As shown, in some embodiments, when valve 61 is closed (in other words, before valve 61 is opened), the condenser 41 in the cooling tank 20 is configured to speed up or slow down the condensation operation as the air pressure in the cooling tank 20 changes, thereby controlling the air pressure in the cooling tank 20. In some embodiments, the controller 80 is configured to control the condenser 41 to speed up or slow down the condensation operation based on the sensing signal provided by the pressure sensor PT02.

[0061] Specifically, when the pressure in the cooling tank 20 rises but does not exceed the first upper limit, the condenser 41 is configured to accelerate the condensation process (e.g., increase the amount of vaporized coolant 35 condensed per unit time or increase the heat removed from the cooling tank 20 per unit time) to reduce the pressure in the cooling tank 20. Conversely, when the pressure in the cooling tank 20 drops but does not fall below the lower limit, the condenser 41 is configured to slow down the condensation process (e.g., reduce the amount of vaporized coolant 35 condensed per unit time or reduce the heat removed from the cooling tank 20 per unit time) to increase the pressure in the cooling tank 20.

[0062] like Figure 1 As shown, in some embodiments, the condenser 41 is configured to receive working fluid through the delivery line 11, and utilize the working fluid to exchange heat with the vaporized coolant 35, causing the vaporized coolant 35 to condense back into a liquid state. Finally, the working fluid is discharged through the delivery line 11. In some embodiments, one or more flow control valves 64 are provided on the delivery line 11, which can regulate the flow rate of the working fluid through the condenser 41, thereby speeding up or slowing down the condensation operation. In some embodiments, the flow control valve 64 is an electric motor valve. In some embodiments, the controller 80 is configured to operate the flow control valve 64 based on the sensing signal provided by the pressure sensor PT02.

[0063] like Figure 1 As shown, in some embodiments, a pressure sensor PT01 is also provided on the delivery line 11, the pressure sensor PT01 being configured to measure the pressure of the working fluid. In some embodiments, a filter 13 is also provided on the delivery line 11, the filter 13 being configured to filter the working fluid before it flows into the condenser 41 to remove impurities therein. In some embodiments, a flow meter 15 is provided on the delivery line 11, the flow meter 15 being configured to measure the flow rate of the working fluid. In some embodiments, a check valve 17 is provided on the delivery line 11, the check valve 17 being configured to prevent backflow of the working fluid.

[0064] like Figure 1 As shown, in some embodiments, the immersion cooling system 10 further includes an expansion device 90 disposed outside the cooling tank 20 and the housing 50, and communicating with the portion of the cooling tank 20 above the coolant 30. When the valve 61 is closed, the expansion device 90 is configured to change volume in response to changes in the air pressure of the cooling tank 20. In some embodiments, the expansion device 90 includes an elastomer, the internal space of which communicates with the cooling tank 20. In response to an increase in air pressure in the cooling tank 20, the elastomer is configured to automatically expand (increase volume) to reduce the air pressure in the cooling tank 20. In response to a decrease in air pressure in the cooling tank 20, the elastomer is configured to automatically shrink (decrease volume) to increase the air pressure in the cooling tank 20.

[0065] like Figure 1 As shown, in some embodiments, the immersion cooling system 10 further includes a condenser 42 connected between the cooling tank 20 and the expansion device 90, through which gas flows from the cooling tank 20 to the expansion device 90. When the gas pressure in the cooling tank 20 exceeds a threshold value, the condenser 42 is activated and configured to condense the vapor (containing vaporized coolant 35) flowing to the expansion device 90, the threshold value being less than a first upper limit value. This configuration reduces the load on the expansion device 90. In some embodiments, the expansion device 90 is connected to the cooling tank 20 via a pipe that passes through the condenser 42. After the condenser 42 is activated, the coolant 30 condensed in the condenser 42 can flow back to the cooling tank 20 along the pipe.

[0066] In some embodiments, the controller 80 is configured to determine whether the air pressure in the cooling tank 20 exceeds the threshold value based on the sensing signal provided by the pressure sensor PT02, and to activate the condenser 42 when the air pressure in the cooling tank 20 exceeds the threshold value. When the air pressure in the cooling tank 20 does not exceed the threshold value, the condenser 42 is turned off.

[0067] Please refer to Figure 2 The immersion cooling method 100 of this embodiment includes a control process in response to a rise in air pressure within the cooling tank. Please refer to [link / reference needed]. Figure 1 In step 101, the air pressure of the cooling tank 20 is controlled by (i) the expansion device 90 connected to the cooling tank 20 increasing its volume as the air pressure of the cooling tank 20 increases and / or (ii) the condenser 41 in the cooling tank 20 accelerating the condensation operation as the air pressure of the cooling tank 20 increases.

[0068] like Figure 1 and Figure 2 As shown, if the air pressure in the cooling tank 20 rises to a threshold value, the immersion cooling method 100 proceeds to step 102, in which the condenser 42 between the cooling tank 20 and the expansion device 90 is activated, causing at least a portion of the vapor flowing from the cooling tank 20 to the expansion device 90 to condense.

[0069] like Figure 1 and Figure 2 As shown, if the air pressure in the cooling tank 20 rises further above the first upper limit, the immersion cooling method 100 proceeds to step 103. In step 103, valve 61 is opened to allow gas to flow from the cooling tank 20 to the enclosed space 56 located on one side of the cooling tank 20.

[0070] like Figure 1 and Figure 2As shown, if the air pressure in the cooling tank 20 rises further above the second upper limit, the immersion cooling method 100 proceeds to step 104, in which the safety valve 62 is opened to allow gas to flow from the cooling tank 20 to the enclosed space 56.

[0071] Please refer to Figure 3 The immersion cooling method 200 of this embodiment includes a control process in response to a decrease in air pressure in the cooling tank. Please refer to [link / reference needed]. Figure 1 In step 201, the air pressure of the cooling tank 20 is controlled by (i) the expansion device 90 connected to the cooling tank 20 reducing its volume as the air pressure of the cooling tank 20 decreases and / or (ii) the condenser 41 in the cooling tank 20 slowing down the condensation operation as the air pressure of the cooling tank 20 decreases.

[0072] like Figure 1 and Figure 3 As shown, if the air pressure in the cooling tank 20 drops below a certain limit, the immersion cooling method 200 proceeds to step 202, in which valve 63 is opened to allow gas to flow from the surrounding environment outside the cooling tank 20 and the enclosed space 56 to the cooling tank 20.

[0073] In summary, in the immersion cooling system disclosed herein, when the internal pressure of the cooling tank is too high, the gas in the cooling tank is discharged into a closed space located on one side of the cooling tank instead of being directly discharged into the atmosphere. In this way, the loss of vaporized coolant can be avoided. The vaporized coolant collected in the closed space can be recycled back into the cooling tank for reuse.

[0074] Although this disclosure has been described above with reference to embodiments, it is not intended to limit this disclosure. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the scope of the appended claims.

Claims

1. An immersion cooling system, comprising: A cooling tank configured to contain coolant and electronic devices, the electronic devices being immersed in the coolant; A housing covers one side of the cooling tank to form an enclosed space; as well as A first valve has two ports respectively connected to the enclosed space and the portion of the cooling tank located above the coolant, and the first valve is configured to open in response to the air pressure in the cooling tank exceeding a first upper limit value; A safety valve having two ports respectively connected to the enclosed space and the portion of the cooling tank located above the coolant, and the safety valve being configured to automatically open when the air pressure in the cooling tank exceeds a second upper limit value, wherein the second upper limit value is greater than the first upper limit value; A recovery pipeline connects the enclosed space and the cooling tank, and is configured to guide the coolant condensed in the enclosed space into the cooling tank; the recovery pipeline includes a check valve configured to prevent coolant or vaporized coolant from flowing back from the cooling tank into the enclosed space; The first valve and the safety valve are installed in the same pipeline, one end of which is connected to the portion of the cooling tank above the coolant and extends into the enclosed space; An expansion device is connected to the portion of the cooling tank located above the coolant, wherein when the first valve is closed, the expansion device is configured to change its volume in response to changes in the air pressure of the cooling tank; A condenser, wherein when the gas pressure in the cooling tank exceeds a threshold value, the condenser is configured to condense the vapor flowing to the expansion device, wherein the threshold value is less than the first upper limit value.

2. The immersion cooling system of claim 1, further comprising a pressure sensor and a controller, the pressure sensor being configured to provide a sensing signal displaying the air pressure of the cooling tank, the controller being configured to determine, based on the sensing signal, whether the air pressure of the cooling tank exceeds a first upper limit value, and to drive the first valve to open when it is determined that the air pressure of the cooling tank exceeds the first upper limit value.

3. The immersion cooling system according to claim 1, further comprising a condenser and a recovery pipeline, the condenser being disposed in the enclosed space and configured to condense the vaporized coolant in the enclosed space, the recovery pipeline connecting the enclosed space and the cooling tank and configured to guide the coolant condensed by the condenser into the cooling tank.

4. The immersion cooling system of claim 1, further comprising a condenser disposed in the cooling tank and configured to perform a condensation operation comprising condensing the vaporized coolant, wherein when the first valve is closed, the condenser is configured to accelerate or decelerate the condensation operation as the pressure in the cooling tank changes.

5. The immersion cooling system of claim 1, further comprising a second valve having two ports respectively communicating with the cooling tank and the surrounding environment located outside the cooling tank and the housing, and the second valve being configured to open in response to the air pressure in the cooling tank being below a lower limit.

6. An immersion cooling method, comprising: Immerse the electronic device in the coolant in the cooling tank; A housing is provided that covers one side of the cooling tank to form an enclosed space; as well as The first valve is opened in response to the air pressure in the cooling tank exceeding the first upper limit value, allowing gas to flow from the cooling tank to the enclosed space; A safety valve is provided, the safety valve having two ports respectively communicating with the enclosed space and the portion of the cooling tank located above the coolant, and the safety valve is configured to automatically open when the air pressure in the cooling tank exceeds a second upper limit value, wherein the second upper limit value is greater than the first upper limit value; A recovery pipeline is provided, connecting the enclosed space and the cooling tank, and configured to guide the coolant condensed in the enclosed space into the cooling tank; the recovery pipeline includes a check valve configured to prevent coolant or vaporized coolant from flowing back from the cooling tank into the enclosed space; The first valve and the safety valve are installed in the same pipeline, one end of which is connected to the portion of the cooling tank above the coolant and extends into the enclosed space; Before opening the first valve, the air pressure in the cooling tank is controlled by using a first condenser located in the cooling tank or an expansion device connected to the cooling tank. When the gas pressure in the cooling tank exceeds a threshold value, a second condenser is used to condense at least a portion of the vapor flowing from the cooling tank to the expansion device, wherein the threshold value is less than the first upper limit value.

7. The immersion cooling method according to claim 6, wherein the step of opening the first valve comprises: The pressure sensor receives a sensing signal, which displays the air pressure in the cooling tank; Based on the sensing signal, determine whether the air pressure in the cooling tank exceeds the first upper limit value; and If the determination result is yes, then the first valve will be opened.

8. The immersion cooling method according to claim 6, further comprising: Condensing the vaporized coolant in the enclosed space; and The coolant condensed in the enclosed space is guided to flow into the cooling tank.

9. The immersion cooling method according to claim 6, further comprising: The second valve is opened in response to the air pressure in the cooling tank being lower than the lower limit, allowing gas to flow from the surrounding environment outside the cooling tank and the housing to the cooling tank.

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