Pump-driven two-phase flow liquid supplementing system and liquid supplementing method for data center

Abstract

The invention discloses a pump-driven two-phase flow liquid supplementing system and method for a data center, and the system comprises a cooling pipeline which is sequentially provided with a liquid storage tank for storing a cooling working medium, a circulating pump, a cooling device for cooling a chip, and a condenser, and also comprises a liquid supplementing tank for storing the cooling working medium for liquid supplementing, the liquid supplementing tank is communicated with the cooling pipeline between the circulating pump and the liquid supplementing tank through a liquid supplementing pipeline, and the cooling pipeline between the cooling device and the condenser extends to the liquid supplementing tank to heat a cooling working medium for liquid supplementing in the liquid supplementing tank; the heating device is arranged at the liquid supplementing tank; the first pressure sensor is arranged at the liquid storage tank; the second pressure sensor is arranged at the liquid outlet of the liquid supplementing tank; and the valve is arranged on the liquid supplementing pipeline. According to the invention, heat utilization of the cooling working medium after the data center is cooled is realized, and timely liquid supplement of the cooling working medium is realized.

Description

Technical Field

[0001] The present invention relates to the field of pump-driven two-phase flow cooling systems, and further to a pump-driven two-phase flow fluid replenishment system and a fluid replenishment method for a data center. Background Art

[0002] As the total amount of global data soars year by year, data centers are becoming increasingly indispensable in today's information age. The computing tasks carried by data centers are becoming increasingly heavy. As a result, the high data volume and high computing power carried by data centers make the thermal conditions of server chips in them increasingly severe, and a large amount of heat is generated during the operation of data centers.

[0003] In order to achieve cooling of the data center, the prior art discloses an application number 202310535198.2, entitled a data center cooling device. By connecting the replenishment tank to the single-phase pipeline, the cooling medium can be replenished in time when it is needed. The cooling medium after cooling the data center will flow to the plate-fin condenser and be cooled by the water plant reservoir. Then, the huge amount of natural cold in the water plant reservoir will cool the cooling medium, thereby causing heat waste of the cooling medium after cooling the data center. Summary of the invention

[0004] The object of the present invention is to provide a pump-driven two-phase flow replenishment system and replenishment method for a data center, so as to solve the technical problem that the heat of the cooling medium is not effectively utilized in the prior art, realize the heat utilization of the cooling medium after cooling the data center, and realize the timely replenishment of the cooling medium.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a pump-driven two-phase flow replenishment system for a data center, including a cooling pipeline, on which a liquid storage tank for storing a cooling medium, a circulating pump, a cooling device for cooling a chip and a condenser are sequentially arranged, and also includes: a replenishment tank for storing the cooling medium for replenishment, the replenishment tank is connected to the cooling pipeline between the circulating pump and the replenishment tank through the replenishment pipeline, the cooling pipeline between the cooling device and the condenser extends to the replenishment tank to heat the cooling medium for replenishment in the replenishment tank; a heating device, the heating device is arranged at the replenishment tank; a first pressure sensor, the first pressure sensor is arranged at the liquid storage tank; a second pressure sensor, the second pressure sensor is arranged at the liquid outlet of the replenishment tank; a valve, the valve is arranged on the replenishment pipeline.

[0006] In some embodiments, the valve is a solenoid valve.

[0007] In some embodiments, the pump-driven two-phase flow fluid replenishment system for a data center further includes a controller, and the controller is respectively connected to the heating device, the first pressure sensor, the second pressure sensor, and the solenoid valve.

[0008] In some embodiments, the pump-driven two-phase flow fluid replenishment system for a data center further includes a cabinet, wherein the fluid storage tank, the circulating pump, the cooling device and the condenser are all arranged in the cabinet, and the fluid replenishment tank is invertedly arranged on the top of the cabinet.

[0009] In some embodiments, an insulated box is provided outside the fluid infusion tank, and the heating device is at least partially located inside the insulated box.

[0010] In some embodiments, the heating device includes an electric heating wire, which extends into the interior of the thermal insulation box and fits against the lower end surface of the fluid infusion tank.

[0011] In some embodiments, a portion of the cooling pipeline is located inside the wall of the thermal insulation box and is spirally wound from bottom to top at the fluid infusion tank.

[0012] In some embodiments, the axial spacing of the cooling pipeline spirally wound around the fluid infusion tank is 2-3 times the diameter of the cooling pipeline.

[0013] In some embodiments, the cooling device includes a plurality of microchannel cold plates arranged in parallel, and the chip is arranged on the microchannel cold plate; a liquid separator and a liquid collector are also provided on the cooling pipeline, and the inlet of the microchannel cold plate is connected to the outlet of the circulation pump through the liquid separator, and the outlet of the microchannel cold plate is connected to the inlet of the condenser through the liquid collector.

[0014] The present invention also provides a pump-driven two-phase flow replenishment method for a data center, which is applied to the aforementioned pump-driven two-phase flow replenishment system for a data center, including: step S1: respectively obtain the monitoring value P1 at the first pressure sensor and the monitoring value P2 at the second pressure sensor; step S2: determine whether P2=P1, if not, execute step S3, if so, execute step S4; step S3: turn on the heating device to heat the cooling medium in the replenishment tank and obtain the monitoring value P2 at the second pressure sensor again, and return to execute step S2; step S4: open the valve, replenish the cooling medium in the replenishment tank into the cooling pipeline through the replenishment pipeline, and execute step S5; step S5: determine whether the heating device is turned on at this time, if so, turn off the heating device.

[0015] Compared with the prior art, the pump-driven two-phase flow liquid replenishment system and liquid replenishment method for a data center provided by the present invention have the following beneficial effects:

[0016] 1. The pump-driven two-phase flow refilling system and refilling method for a data center provided by the present invention utilizes the heat of the cooling medium after cooling the data center to preheat the cooling medium in the refilling tank, thereby increasing the pressure in the refilling tank, and optionally cooperates with a heating device to realize the refilling function. Specifically, there are the following situations:

[0017] When in operation, the cooling medium after cooling the data center is transported to the vicinity of the refill tank through the cooling pipeline, and the heat transferred from the data center to the cooling medium is used to heat the cooling medium in the refill tank, thereby achieving effective utilization of the heat in the cooling medium after cooling the data center, thereby increasing the pressure value at the refill tank. If the pressure value measured by the second pressure sensor is not equal to the pressure value measured by the first pressure sensor at this time, the cooling medium in the refill tank is heated by the heating device so that the pressure value measured by the second pressure sensor is equal to the pressure value measured by the first pressure sensor, and then the valve is opened to replenish the cooling medium in the refill tank into the cooling pipeline; if the heat of the cooling medium can make the pressure value measured by the second pressure sensor equal to the pressure value measured by the first pressure sensor after utilization, the valve is directly opened without opening the heating device, and the cooling medium in the refill tank is replenished into the cooling pipeline;

[0018] When in a shutdown condition, if the pressure value measured by the second pressure sensor is not equal to the pressure value measured by the first pressure sensor, turn on the heating device to heat the coolant in the fluid replenishment tank. After the pressure value measured by the second pressure sensor is equal to the pressure value measured by the first pressure sensor, open the valve to replenish the coolant in the fluid replenishment tank into the cooling pipeline.

[0019] 2. The pump-driven two-phase flow refilling system and refilling method for a data center provided by the present invention, by setting a controller and connecting the controller to a heating device, a first pressure sensor, a second pressure sensor and a solenoid valve, can automatically compare the pressure values ​​received at the first pressure sensor and the second pressure sensor, and then decide whether to automatically open the heating device or the solenoid valve according to actual conditions, thereby realizing an automatic refilling function.

[0020] 3. The pump-driven two-phase flow rehydration system and rehydration method for data centers provided by the present invention, the insulation box can well preserve the heat at the rehydration tank to prevent heat loss, the cooling pipeline is extended and distributed in a spiral shape in the insulation box, so that the heat of the cooling medium in the cooling pipeline is evenly distributed in the insulation box, and the electric heating wire is located on the lower end surface of the inverted rehydration tank and fits it, so that the cooling medium in the rehydration tank can be better heated by the electric heating wire and support the rehydration tank.

[0021] 4. The pump-driven two-phase flow refilling system and refilling method for data centers provided by the present invention, in the two-phase flow (gas and liquid) in the inverted refilling tank, due to density reasons, the gas floats up and the liquid is deposited at the bottom of the refilling tank, thereby ensuring that the liquid cooling medium enters the cooling pipeline for refilling. Moreover, since the refilling tank is set on the top of the cabinet, the height difference can be used to make the cooling medium enter the cooling pipeline more easily through the refilling pipe based on its own gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0023] Figure 1 It is a schematic diagram of the structure of a pump-driven two-phase flow replenishment system for a data center;

[0024] Figure 2 It is a structural diagram of the incubator;

[0025] Description of Figure Numbers:

[0026] 1-cooling pipeline, 2-liquid storage tank, 3-circulating pump, 4-microchannel cold plate, 5-condenser, 6-first pressure sensor, 7-second pressure sensor, 8-solenoid valve, 9-controller, 10-heating device, 10a-electric heating wire, 11-insulation box, 11a-insulation box inlet, 11b-insulation box outlet, 11c-vertical channel, 12-chip, 13-liquid distributor, 14-liquid collector, 15-liquid replenishing tank, 16-cooling medium for liquid replenishment, 17-liquid replenishing pipeline. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0028] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0029] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] [Example 1]

[0033] In Example 1, Figure 1-Figure 2 As shown, this embodiment discloses a specific implementation of a pump-driven two-phase flow refilling system for a data center, including a cooling pipeline 1, on which a liquid storage tank 2 for storing a refrigerant, a circulating pump 3, a cooling device for cooling a chip 12, and a condenser 5 are sequentially provided. In order to realize refilling for the cooling pipeline 1, a refilling tank 15 for storing a refrigerant 16 for refilling, a heating device, a first pressure sensor 6, a second pressure sensor 7, and a valve are also included, wherein the refilling tank 15 is connected to the cooling pipeline 1 between the circulating pump 3 and the refilling tank 15 through a refilling pipeline 17, and the cooling pipeline 1 between the cooling device and the condenser 5 extends to the refilling tank 15 to heat the refrigerant 16 for refilling in the refilling tank 15, and the heating device is arranged at the refilling tank 15 to further heat the refrigerant in the refilling tank 15. The first pressure sensor 6 is disposed at the liquid storage tank 2 to detect the pressure in the liquid storage tank 2, the second pressure sensor 7 is disposed at the liquid outlet of the liquid replenishing tank 15 to detect the pressure in the liquid replenishing tank 15, and the valve is disposed on the liquid replenishing pipeline 17 to control whether the cooling medium in the liquid replenishing tank 15 can enter the cooling pipeline 1 through the liquid replenishing pipeline 17. In this embodiment, the valve is a solenoid valve 8, and in other embodiments, the valve may also be a manual valve, which will not be described in detail here.

[0034] The above-mentioned data center pump-driven two-phase flow replenishment system uses the heat of the cooling medium after cooling the data center to preheat the cooling medium in the replenishment tank 15, thereby increasing the pressure in the replenishment tank 15, and optionally cooperates with a heating device to achieve the replenishment function.

[0035] Furthermore, in order to further realize the automatic fluid replenishment function, the present embodiment further includes a controller 9, which is respectively connected to the heating device, the first pressure sensor 6, the second pressure sensor 7 and the solenoid valve 8. The controller 9 can control whether the heating device heats the cooling medium in the fluid replenishment tank 15, thereby adjusting the pressure in the fluid replenishment tank 15, and automatically obtains the pressure detection values ​​at the first pressure sensor 6 and the second pressure sensor 7 to determine whether the solenoid valve 8 can be opened for fluid replenishment.

[0036] [Example 2]

[0037] Embodiment 2 is based on embodiment 1, as Figure 1-Figure 2 As shown, Example 2 also includes a cabinet, a liquid storage tank 2, a circulating pump 3, a cooling device and a condenser 5 are all arranged in the cabinet, and the liquid replenishment tank 15 is inverted and arranged on the top of the cabinet, so that the height difference can be utilized to make the cooling medium enter the cooling pipeline 1 more easily through the liquid replenishment pipe based on its own gravity. At the same time, in the two-phase flow (gas and liquid) in the inverted liquid replenishment tank 15, due to density reasons, the gas floats and the liquid is deposited at the bottom of the liquid replenishment tank 15, thereby ensuring that the liquid cooling medium enters the cooling pipeline 1 for replenishment.

[0038] Furthermore, in order to better preserve the heat at the fluid infusion tank 15 and prevent heat loss, an insulation box 11 is provided on the outside of the fluid infusion tank 15, and the heating device is at least partially located inside the insulation box 11. In this embodiment, the heating device includes an electric heating wire 10a, which extends into the insulation box 11 and fits the lower end surface of the fluid infusion tank 15, so that the contact area between the electric heating wire 10a and the fluid infusion tank 15 is large, thereby achieving a better heating effect and supporting the fluid infusion tank 15.

[0039] [Example 3]

[0040] Embodiment 3 is based on embodiment 2, as Figure 2 As shown, a portion of the cooling pipeline 1 of Example 3 is located in the wall of the insulation box 11 and is spirally wound from bottom to top at the liquid replenishment tank 15, that is, the insulation box 11 has an insulation box inlet 11a and an insulation box outlet 11b, and the insulation box inlet 11a to the insulation box outlet 11b is the aforementioned portion of the cooling pipeline 1 spirally wound from bottom to top at the liquid replenishment tank 15, and the cooling medium after cooling the data center flows from the insulation box inlet 11a through the wall of the insulation box 11 to preheat the cooling medium in the liquid replenishment tank 15. At the same time, because the cooling pipeline 1 is distributed in a spiral shape in the insulation box 11, the heat of the cooling medium in the cooling pipeline 1 is evenly distributed in the insulation box 11, and the heating of the cooling medium in the liquid replenishment tank 15 is more uniform.

[0041] Specifically, in this embodiment, the axial spacing of the cooling pipes spirally wound at the liquid replenishment tank 15 is 2.5 times the diameter of the cooling pipeline 1, so as to take into account both the structural strength of the incubator 11 and the heating effect of the cooling medium in the liquid replenishment tank 15 after the cooling medium in the data center cools down. In other embodiments, the axial spacing of the cooling pipes spirally wound at the liquid replenishment tank 15 is 2 times, 3 times, or other multiples between 2 and 3 times the diameter of the cooling pipeline 1, which can be adjusted according to actual conditions and will not be repeated here.

[0042] Specifically, Figure 2 As shown, the insulation box 11 is provided with a vertical channel 11c, the opening of the liquid replenishment tank 15 is connected to the upper end of the vertical channel 11c by a one-way self-sealing quick-connect joint, and the lower end of the vertical channel 11c is connected to the cooling pipeline 1 through the liquid replenishment pipeline 17. The wall of the insulation box 11 includes an inner wall, an outer wall and a heat preservation material filled between the inner wall and the outer wall. A part of the cooling pipeline 1 is located between the inner wall and the outer wall of the insulation box 11 and is wrapped in the heat preservation material. The aforementioned inner wall or outer wall is a steel or plastic part, which can achieve a good heat preservation function.

[0043] [Example 4]

[0044] Embodiment 4 is based on embodiment 1-3, as Figure 1 As shown, the cooling device includes a plurality of microchannel cold plates 4 arranged in parallel, the chip 12 is arranged on the microchannel cold plates 4, and the cooling medium passes through the microchannel cold plates 4 to cool the chip 12.

[0045] like Figure 1 As shown, a liquid separator 13 and a liquid collector 14 are also provided on the cooling pipeline 1. The inlet of the microchannel cold plate 4 is connected to the outlet of the circulation pump 3 through the liquid separator 13, and the outlet of the microchannel cold plate 4 is connected to the inlet of the condenser 5 through the liquid collector 14. The cooling medium in the cooling pipeline 1 is divided into several branches through the liquid separator 13 and then flows synchronously through the corresponding microchannel cold plate 4 to cool the chip 12, and then converges into one pipeline through the liquid collector 14, thereby realizing synchronous cooling of multiple chips 12, greatly improving the cooling efficiency and cooling range.

[0046] [Example 5]

[0047] Embodiment 5 discloses a pump-driven two-phase flow rehydration method for a data center, which is applied to any one of the pump-driven two-phase flow rehydration systems for a data center in the aforementioned embodiments 1-4, and specifically comprises the following steps:

[0048] Step S1: respectively obtaining a monitoring value P1 at the first pressure sensor 6 and a monitoring value P2 at the second pressure sensor 7;

[0049] Step S2: Determine whether P2=P1 is true, if not, execute step S3, if yes, execute step S4;

[0050] In step S2, only when P2=P1, the pressures at the fluid replenishment tank 15 and the fluid storage tank 2 are equivalent. At this time, opening the valve can allow the coolant in the fluid replenishment tank 15 to flow smoothly into the cooling pipeline 1. In this step, it is determined whether P2=P1 is established, so as to confirm whether the pressure in the fluid replenishment tank 15 meets the pressure requirement for replenishing the coolant into the cooling pipeline 1. If not, execute step S3; if yes, execute step S4.

[0051] Step S3: Turn on the heating device to heat the cooling medium in the liquid replenishing tank 15 and obtain the monitoring value P2 at the second pressure sensor 7 again, and return to execute step S2;

[0052] In step S3, since it has been determined that the pressure in the fluid replenishment tank 15 does not meet the fluid replenishment requirement, the pressure in the fluid replenishment tank 15 is increased by heating the coolant in the fluid replenishment tank 15, and then the process returns to step S2 to determine again whether the fluid replenishment pressure requirement is met.

[0053] Step S4: Open the valve, replenish the cooling medium in the liquid replenishing tank 15 into the cooling pipeline 1 through the liquid replenishing pipeline 17, and execute step S5;

[0054] In step S4, since it has been confirmed that the pressure in the liquid replenishing tank 15 meets the liquid replenishing requirement, the valve is opened to replenish the liquid, and then step S5 is executed.

[0055] Step S5: Determine whether the heating device is turned on at this time, and if so, turn off the heating device.

[0056] In step S5, it is mainly to confirm whether the heating device has been turned on for heating before. If yes, the heating device is turned off because the pressure of the liquid replenishing tank 15 has reached the liquid replenishing requirement.

[0057] Specifically, the above method is discussed according to the operating conditions and the shutdown conditions respectively.

[0058] When in operating condition, the data center is being cooled.

[0059] The cooling medium after cooling the data center is transported to the vicinity of the refill tank 15 through the cooling pipeline 1, and the heat transferred from the data center to the cooling medium is used to heat the cooling medium in the refill tank 15, thereby achieving effective utilization of the heat in the cooling medium after cooling the data center, thereby increasing the pressure value at the refill tank 15. If the pressure value measured by the second pressure sensor 7 is not equal to the pressure value measured by the first pressure sensor 6 at this time, the cooling medium in the refill tank 15 is heated by the heating device again, so that the pressure value measured by the second pressure sensor 7 is equal to the pressure value measured by the first pressure sensor 6, and then the valve is opened to replenish the cooling medium in the refill tank 15 into the cooling pipeline 1; if the heat of the cooling medium can make the pressure value measured by the second pressure sensor 7 equal to the pressure value measured by the first pressure sensor 6 after utilization, the valve is directly opened without opening the heating device, and the cooling medium in the refill tank 15 is replenished into the cooling pipeline 1.

[0060] When in shutdown conditions, the data center is not being cooled.

[0061] If the pressure value measured by the second pressure sensor 7 is not equal to the pressure value measured by the first pressure sensor 6, turn on the heating device to heat the coolant in the fluid replenishment tank 15. After the pressure value measured by the second pressure sensor 7 is equal to the pressure value measured by the first pressure sensor 6, open the valve to replenish the coolant in the fluid replenishment tank 15 into the cooling pipeline 1.

[0062] The difference between the aforementioned operating condition and shutdown condition is that in the operating condition, the cooling medium in the liquid replenishment tank 15 is preheated by the cooling medium after cooling the data center, while in the shutdown condition, there is no such preheating.

[0063] Furthermore, the controller 9 can realize the automatic execution and control of all the aforementioned steps, thereby realizing the automatic fluid replenishment function.

Claims

1. A pump-driven two-phase flow replenishment system for a data center, comprising a cooling pipeline, wherein a liquid storage tank for storing a cooling medium, a circulating pump, a cooling device for cooling a chip and a condenser are sequentially arranged on the cooling pipeline, characterized in that: Also includes: A liquid replenishment tank storing a cooling medium for liquid replenishment, wherein the liquid replenishment tank is connected to a cooling pipeline between the circulation pump and the liquid replenishment tank through a liquid replenishment pipeline, and a cooling pipeline between the cooling device and the condenser extends to the liquid replenishment tank to heat the cooling medium for liquid replenishment in the liquid replenishment tank; A heating device, wherein the heating device is arranged at the fluid infusion tank; a first pressure sensor, wherein the first pressure sensor is disposed at the liquid storage tank; a second pressure sensor, wherein the second pressure sensor is disposed at the liquid outlet of the liquid infusion tank; A valve is arranged on the fluid infusion pipeline.

2. The pump-driven two-phase flow replenishment system for a data center according to claim 1, characterized in that: The valve is a solenoid valve.

3. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 2, characterized in that: It also includes a controller, which is connected to the heating device, the first pressure sensor, the second pressure sensor and the solenoid valve respectively.

4. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 1, characterized in that: It also includes a cabinet, in which the liquid storage tank, the circulating pump, the cooling device and the condenser are all arranged, and the liquid replenishing tank is invertedly arranged on the top of the cabinet.

5. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 4, characterized in that: An insulation box is arranged outside the fluid infusion tank, and the heating device is at least partially located inside the insulation box.

6. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 5, characterized in that: The heating device comprises an electric heating wire, which extends into the interior of the thermal insulation box and fits against the lower end surface of the fluid infusion tank.

7. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 5, characterized in that: A portion of the cooling pipeline is located in the wall of the thermal insulation box and is spirally wound from bottom to top at the liquid replenishment tank.

8. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 7, characterized in that: The axial spacing of the cooling pipeline spirally wound at the liquid replenishing tank is 2-3 times the diameter of the cooling pipeline.

9. The pump-driven two-phase flow liquid replenishment system for a data center according to claim 1, characterized in that: The cooling device comprises a plurality of microchannel cold plates arranged in parallel, and the chip is arranged on the microchannel cold plates; The cooling pipeline is also provided with a liquid separator and a liquid collector, the inlet of the microchannel cold plate is connected with the outlet of the circulation pump through the liquid separator, and the outlet of the microchannel cold plate is connected with the inlet of the condenser through the liquid collector.

10. A pump-driven two-phase flow refilling method for a data center, applied to a pump-driven two-phase flow refilling system for a data center as claimed in any one of claims 1 to 9, characterized in that: include: Step S1: obtaining a monitoring value P1 at the first pressure sensor and a monitoring value P2 at the second pressure sensor respectively; Step S2: Determine whether P2=P1 is true, if not, execute step S3, if yes, execute step S4; Step S3: turning on the heating device to heat the cooling medium in the liquid replenishing tank and obtaining the monitoring value P2 at the second pressure sensor again, and returning to execute step S2; Step S4: opening the valve, replenishing the cooling medium in the liquid replenishing tank into the cooling pipeline through the liquid replenishing pipeline, and executing step S5; Step S5: Determine whether the heating device is turned on at this time, and if so, turn off the heating device.

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