Liquid cooling distribution unit system

Abstract

The invention discloses a liquid cooling distribution unit system which comprises a primary side circulation pipeline, the primary side circulation pipeline is at least connected with one heat exchanger, and the heat exchanger is connected with a secondary side circulation pipeline; a condenser and a fluorine pump are arranged on the primary side circulation pipeline; the heat exchange unit comprises a brazing type heat exchanger, a first medium inlet of the brazing type heat exchanger is connected with a fluorine pump, a throttling device is arranged on one side of the first medium inlet, a first medium outlet of the brazing type heat exchanger is connected with a condenser, and the throttling device is arranged between the first medium inlet and the fluorine pump. A second medium outlet and a second medium inlet of the brazing heat exchanger are respectively connected with a secondary side circulation pipeline, the heat exchange efficiency of the cooling system is improved, and the cooling temperature is accurately controlled, so that the effect of adapting to higher power density of the data machine room is realized.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of liquid cooling system, in particular to a liquid cooling distribution unit system. BACKGROUND

[0002] Air cooling is a conventional cooling method for data center servers. With the development of the industry and the increase of power density, the cooling capacity of air cooling alone is close to the limit and cannot meet the cooling needs of high-power density computer room layout. If a cold plate liquid cooling solution is used, the liquid cooling usually takes away 30-70% of the load, and the remaining part is cooled by air cooling, thereby adapting to higher data center power density.

[0003] However, in the conventional cold plate liquid cooling system, the supply of cooling liquid is constant, and for the change of the ambient temperature in the high-power density computer room, it cannot provide effective refrigeration effect, and the method of cooperating with air cooling still cannot effectively control the ambient temperature in the high-power density computer room. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a liquid cooling distribution unit system which can meet the cooling needs of high-power density computer room layout.

[0005] To achieve the above purpose, the embodiment of the present application provides a liquid cooling distribution unit system,

[0006] The liquid cooling distribution unit system provided by the embodiment of the present application comprises a primary side circulation pipeline, the primary side circulation pipeline is connected with at least one heat exchanger, and the heat exchanger is connected with a secondary side circulation pipeline;

[0007] The primary side circulation pipeline is provided with a condenser and a fluorine pump;

[0008] The heat exchange unit comprises a brazed heat exchanger, a first medium inlet of the brazed heat exchanger is connected with the fluorine pump, a throttling device is arranged on one side of the first medium inlet, a first medium outlet of the brazed heat exchanger is connected with the condenser, a throttling device is arranged between the first medium inlet and the fluorine pump, and a second medium discharge outlet and a second medium inlet of the brazed heat exchanger are connected with the secondary side circulation pipeline respectively.

[0009] Optionally, the secondary side circulation pipeline comprises a first pipeline and a second pipeline, the first pipeline is connected with the second medium outlet, the second pipeline is connected with the second medium inlet, a flow meter is arranged on the first pipeline, and a liquid supplement tank and a circulating pump are arranged on the second pipeline along the medium flow direction in the second pipeline.

[0010] In addition, a liquid storage tank is arranged on the primary side circulation pipeline on the side of the condenser liquid discharge port.

[0011] Through the above scheme, the gas phase change refrigerant flows into the liquid storage tank after being cooled and condensed in the condenser, the fluorine pump is frequency converted according to the terminal load change condition, and the liquid refrigerant in the liquid storage tank is transported to the brazed heat exchanger, so that the cold source side refrigeration cycle is completed.

[0012] Optionally, the gas inlet side of the condenser is provided with a compressor.

[0013] Through the above scheme, the compressor is started when the outdoor temperature exceeds the predetermined temperature value, and the compressor refrigeration cycle is adopted.

[0014] Optionally, the refrigerant circulation system comprises a one-way valve arranged in parallel with the fluorine pump.

[0015] Through the above scheme, the one-way valve arranged in parallel is used to prevent leakage after pressure reduction or shutdown of the system, and the one-way valve arranged in parallel can prevent such conditions from occurring when the system stops running or other unexpected conditions occur.

[0016] Optionally, an expansion tank is arranged on the second pipeline towards the liquid cooling side of the server liquid tank.

[0017] Through the above scheme, the expansion tank is used to supplement the hydraulic pressure in the secondary side circulation pipeline, so as to ensure that the hydraulic pressure in the secondary side circulation pipeline remains relatively stable.

[0018] Optionally, the condenser is a air-cooled condenser, an evaporative condenser or a composite evaporative condenser.

[0019] In addition, the composite evaporative condenser comprises a condensing coil, a first spraying assembly is arranged above the condensing coil, an indirect evaporative cooler is arranged on the gas inlet side of the composite evaporative condenser, a second spraying assembly is arranged above the indirect evaporative cooler, and a water collecting tray is arranged below the indirect evaporative cooler and the condensing coil.

[0020] Through the above scheme, the conventional evaporative condenser is a closed structure, the water collecting tray is arranged below the coil, and the circulating spraying is performed through the connection of the spraying pipeline, so as to reduce the condensing temperature. In addition, for the scene where the outdoor wet bulb temperature is high, the indirect evaporative cooler can be additionally arranged, so as to further improve the condensing effect of the evaporative condenser.

[0021] In addition, a third pipeline is arranged between the first pipeline and the second pipeline, the third pipeline is used as a maintenance pipeline of the secondary side circulation pipeline, a maintenance valve group is arranged on the first pipeline, the second pipeline and the third pipeline, and the maintenance valve group comprises an electromagnetic valve and / or a manual valve.

[0022] Through the above scheme, the maintenance valve group is used to facilitate the maintenance of the secondary side circulation pipeline by the staff in the case of failure of the secondary side circulation pipeline.

[0023] Optionally, the phase-change refrigerant is used in the refrigerant circulation system.

[0024] By the above scheme, the phase-change refrigerant relies on its latent heat of phase change to not only not produce a supply-return temperature difference of the medium, but also carry about 9 times the cold quantity of water (with a supply-return temperature difference of 5 DEG C) per unit mass of the phase-change refrigerant (taking R134a as an example), that is, the mass flow of the phase-change refrigerant is only 1 / 9 of that of water, and the mass flow is greatly reduced, so the conveying energy consumption of the phase-change refrigerant is far less than that of water or the ethylene glycol solution.

[0025] The liquid cooling distribution unit provided in the embodiments of the present application improves the heat exchange efficiency of the cooling system and accurately controls the cooling temperature, thereby achieving the effect of adapting to higher data room power density. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 The structural schematic diagram of a liquid cooling distribution unit system provided in the embodiments of the present application is shown in the figure.

[0028] Figure 2 The structural schematic diagram of another embodiment provided in the embodiments of the present application is shown in the figure.

[0029] Figure 3 The structural schematic diagram of a composite evaporative condenser provided in the embodiments of the present application is shown in the figure.

[0030] Explanation of reference signs:

[0031] 1, primary side circulation pipeline; 101, condenser; 102, fluorine pump; 103, liquid storage tank; 104, check valve; 105, throttling device; 106, compressor;

[0032] 2, brazed heat exchanger;

[0033] 3, secondary side circulation pipeline; 310, first pipeline; 320, second pipeline; 330, third pipeline; 311, flow meter; 321, expansion tank; 322, liquid supplement tank; 323, circulating pump; 331, electromagnetic valve; 332, manual valve;

[0034] 4, composite evaporative cooler; 401, condensing coil; 402, water collecting tray; 403, first spraying assembly; 404, indirect evaporative cooler; 405, second spraying assembly. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application.

[0036] Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] Figure 1 A structural schematic diagram of a liquid cooling distribution unit system provided by the embodiments of the present application is applied to a cooling system of a high-power density computer room. The embodiments of the present application are only described by taking the structural schematic diagram as an example, but the embodiments of the present application are not limited to this. Figure 1

[0038] Referring to FIG. 1, the liquid cooling distribution unit system includes a primary side circulation pipeline 1, the primary side circulation pipeline 1 is connected with at least one heat exchanger, and the heat exchanger is connected with a secondary side circulation pipeline 3. Figure 1 The primary side circulation pipeline 1 includes a condenser 101 and a fluorine pump 102 connected by a pipeline.

[0039] The heat exchange unit includes a brazed heat exchanger 2, a first medium inlet of the brazed heat exchanger 2 is connected with the fluorine pump 102, a throttling device 105 is arranged on one side of the first medium inlet, a first medium outlet of the brazed heat exchanger 2 is connected with the condenser 101, a throttling device 105 is arranged between the first medium inlet and the fluorine pump 102, and a second medium discharge outlet and a second medium inlet of the brazed heat exchanger 2 are respectively connected with the secondary side circulation pipeline 3.

[0040] The secondary side circulation pipeline 3 includes a first pipeline 310 and a second pipeline 320, the first pipeline 310 is connected with the second medium outlet, and the second pipeline 320 is connected with the second medium inlet. A liquid supplement tank 322 and a circulation pump 323 are arranged on the second pipeline 320 along a medium flow direction in the second pipeline 320.

[0041]

[0042] ​​In use, the condenser 101 on the primary side circulation pipeline 1 is provided with the liquid storage tank 103 on the side of the liquid outlet, the liquid phase change refrigerant absorbs the heat at the end in the brazed heat exchanger 2, and is vaporized and enters the condenser 101, and because the evaporation temperature is high, the corresponding condensation temperature is high. The gas phase change refrigerant flows into the liquid storage tank 103 after being cooled and condensed in the condenser 101, and the fluorine pump 102 is frequency converted according to the change of the end load to transport the liquid refrigerant in the liquid storage tank 103 to the brazed heat exchanger 2, so as to complete the cold source side refrigeration cycle.

[0043] Further, the throttling device 105 is arranged on the side of the first throttling inlet of the brazed heat exchanger 2, and the throttling device 105 can accurately control the amount of refrigerant supplied to the brazed heat exchanger 2 during the process that the fluorine pump 102 supplies refrigerant to multiple brazed heat exchangers 2 at the same time, so as to maximize the efficiency of the cold distribution unit as a whole and ensure the stable operation of the cold distribution unit system.

[0044] The second pipeline 320 is provided with the liquid supplement tank 322 and the circulating pump 323 in sequence along the flow direction of the medium in the second pipeline 320, and the first pipeline 310 is provided with the flow meter 311. During the circulation liquid cooling process of the cooling liquid on the server liquid cooling side, because the environment temperature of the server room is in a changeable state, the flow meter 311 is used to monitor the cooling liquid supply flow on the server liquid cooling side, and the circulating pump 323 is adjusted according to the real-time monitoring data of the flow meter 311, so as to meet the temperature change state of the server liquid cooling side and accurately control the temperature change of the server liquid cooling.

[0045] The second pipeline 320 is also provided with the expansion tank 321. Because the circulating pump 323 is frequency converted, the hydraulic pressure in the secondary side circulation pipeline 3 also changes with the flow, so the expansion tank 321 is arranged on the second pipeline 320 to supplement the hydraulic pressure by using the expansion tank 321, so as to keep the hydraulic pressure in the secondary side circulation pipeline 3 in a relatively stable state, thereby keeping the heat exchange efficiency of the brazed heat exchanger 2 stable.

[0046] A third pipeline 330 is provided between the first pipeline 310 and the second pipeline 320. The third pipeline 330 is installed on the first pipeline 310 at the inlet side of the flow meter 311, and on the second pipeline 320 at the side of the expansion tank 321 away from the replenishment tank 322. A maintenance valve assembly is provided on the first pipeline 310, the second pipeline 320 and the third pipeline 330. The maintenance valve assembly includes a solenoid valve 331 and / or a manual valve 332. The manual valve 332 is located on the inlet and outlet side of the solenoid valve 331 and is kept in a normally closed state. At least one manual valve 332 is provided on the first pipeline 310 and the second pipeline 320 respectively. When any component of the secondary circulation pipeline 3 malfunctions or other issues cause unstable operation, the operator can open the manual valve 332 and solenoid valve 331 of the third pipeline 330, and close the manual valve 332 on the first pipeline 310 and the second pipeline 320 before carrying out maintenance work, ensuring that the maintenance work on the secondary pipeline is carried out in a safe environment.

[0047] Furthermore, a check valve 104 is provided on the primary circulation pipeline 1 in parallel with the fluorine pump 102. In the hydraulic system, if the flow reverses, it will cause the system signal transmission to fail or some functions to fail, affecting the normal operation of the system. The parallel check valve 104 can prevent backflow and ensure the normal and stable operation of the hydraulic system.

[0048] The following describes the primary circulation pipeline 1 under specific operating conditions. The coolant supply and return temperatures for the cold plate liquid-cooled server are 40℃ / 45℃, and the saturated evaporation temperature of the phase change refrigerant in the primary circulation pipeline 1 of the brazed heat exchanger 2 is 38℃. Under the condition of the fully refrigerated pump 102, the saturated condensation temperature of the evaporative condenser is 38℃. Considering the pressure drop from the evaporator to the condenser 101, the estimated equivalent saturated evaporation temperature decreases by 1.5℃; therefore, the outdoor condensation temperature is 36.5℃.

[0049] There are two types of condenser 101 to be adopted: the first is an air-cooled condenser. The heat exchange temperature difference of the air-cooled condenser is generally 8 to 15℃. If the air-cooled condenser is designed with a heat exchange temperature difference of 10℃, the condensation process can be achieved without turning on the compressor 106 when the outdoor dry bulb temperature is below 26.5℃ or the wet bulb temperature is below 25.5℃.

[0050] If an evaporative condenser is used, the condensation approach temperature is usually 3 to 6°C. If calculated at 5°C, that is, if the outdoor wet-bulb temperature does not exceed 31.5°C, then there is no need to turn on the compressor 106. Only the refrigerant pump 102 is needed to achieve the refrigeration cycle.

[0051] The two schemes can be applied to areas with low outdoor environment, further simplifying the control and operation cost of the conventional cold source system.

[0052] Referring to Figure 3 As shown in the figure, the condenser 101 can also use a composite evaporative condenser 4, which includes a condensing coil 401, above which is provided with a first spraying assembly 403, and an indirect evaporative cooler 404 is provided on one side of the air inlet of the composite evaporative condenser 4, above which is provided with a second spraying assembly 405, and a water pan 402 is provided below the indirect evaporative cooler 404 and the condensing coil 401.

[0053] For the scene of high outdoor wet-bulb temperature, the condensing temperature of the cooler is reduced by setting the composite evaporative condenser 4, and the corresponding wet-bulb temperature of the outdoor fresh air is reduced after being cooled by the indirect evaporative cooler 404, so that the condensing temperature can be reduced under the condition that the approaching temperature of the condenser 101 remains unchanged.

[0054] Referring to Figure 2 As shown in the figure, in order to expand the adaptation scene of the liquid cooling distribution unit system, the compressor 106 is provided on one side of the air inlet of the condenser 101, and in areas with high outdoor wet-bulb temperature, the compressor 106 is used for refrigeration cycle in high temperature seasons to ensure the stable operation of the liquid cooling distribution unit system.

[0055] The phase change refrigerant is used in the primary side circulation pipeline 1, and when transporting the same amount of heat, the phase change refrigerant relies on its latent heat of phase change to not only not produce the supply and return temperature difference of the medium, but also the cold quantity carried by the unit mass of phase change refrigerant (taking R134a as an example) is about 9 times that of water (the supply and return temperature difference is 5℃), that is, the mass flow of the phase change refrigerant is only 1 / 9 of that of water, and the mass flow is greatly reduced. Therefore, the transportation energy consumption of the phase change refrigerant is much smaller than that of water or glycol solution.

[0056] Among them, the terms such as "up", "down", etc. are used to describe the relative position relationship of each structure in the drawing, which is only for the convenience of clear description, and is not used to limit the scope of the application. The change or adjustment of the relative relationship is also regarded as the scope of the application without substantial change of the technical content.

[0057] It should be noted that in the present application, unless specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0058] In addition, in the present application, unless specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid-cooled distribution unit system, characterized in that, It includes a primary circulation pipeline (1), which is connected to at least one heat exchange unit, and the heat exchange unit is connected to a secondary circulation pipeline (3); A condenser (101) and a refrigerant pump (102) are installed on the primary circulation pipeline (1); The heat exchange unit includes a brazed heat exchanger (2), the first medium inlet of the brazed heat exchanger (2) is connected to a fluorine pump (102), a throttling device (105) is provided on one side of the first medium inlet, the first medium outlet of the brazed heat exchanger (2) is connected to a condenser (101), a throttling device (105) is provided between the first medium inlet and the fluorine pump (102), and the second medium outlet and the second medium inlet of the brazed heat exchanger (2) are respectively connected to the secondary side circulation pipeline (3).

2. The liquid-cooled distribution unit system according to claim 1, characterized in that, The secondary circulation pipeline (3) includes a first pipeline (310) and a second pipeline (320). The first pipeline (310) is connected to the second medium outlet, and the second pipeline (320) is connected to the second medium inlet. A flow meter (311) is installed on the first pipeline (310), and a replenishment tank (322) and a circulation pump (323) are installed on the second pipeline (320) along the medium flow direction inside the second pipeline (320).

3. The liquid-cooled distribution unit system according to claim 1, characterized in that, A liquid storage tank (103) is provided on the primary circulation pipeline (1) on the side of the condenser (101) drain port.

4. The liquid-cooled distribution unit system according to claim 1, characterized in that, A compressor (106) is installed on the primary circulation pipeline (1) on the side of the condenser (101) inlet.

5. The liquid-cooled distribution unit system according to claim 1, characterized in that, A one-way valve (104) is provided on the primary circulation pipeline (1) in parallel with the fluorine pump (102).

6. The liquid-cooled distribution unit system according to claim 2, characterized in that, An expansion tank (321) is provided on the second pipeline (320) on the side of the replenishment tank (322) facing the server liquid cooling side.

7. The liquid-cooled distribution unit system according to claim 1, characterized in that, The condenser (101) includes an air-cooled condenser, an evaporative condenser, and a combined evaporative condenser (4).

8. The liquid-cooled distribution unit system according to claim 7, characterized in that, The composite evaporative condenser (4) includes a condensing coil (401), a first spray assembly (403) is provided above the condensing coil (401), an indirect evaporative cooler (404) is provided on one side of the air inlet of the composite evaporative condenser (4), a second spray assembly (405) is provided above the indirect evaporative cooler (404), and a water receiving tray (402) is provided below the indirect evaporative cooler (404) and the condensing coil (401).

9. The liquid-cooled distribution unit system according to claim 2, characterized in that, A third pipeline (330) is provided between the first pipeline (310) and the second pipeline (320). The third pipeline (330) is used as a maintenance pipeline for the secondary side circulation pipeline (3). Maintenance valve groups are provided on the first pipeline (310), the second pipeline (320) and the third pipeline (330). The maintenance valve groups include a solenoid valve (331) and / or a manual valve (332).

10. The liquid-cooled distribution unit system according to any one of claims 1-9, characterized in that, Phase change refrigerant is used in the primary side circulation pipeline (1).

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