Submerged liquid cooling cabinet cooling system and control method

Abstract

The application provides an immersion liquid cooling cabinet cooling system and a control method, wherein the cooling system comprises: a liquid cooling cycle including a liquid cooling end, a first liquid pump, a first intermediate heat exchanger and a second intermediate heat exchanger, and having a first cold carrier; a compressor refrigeration cycle including a compressor, a throttling element and a condensing heat exchanger connected by pipelines, and having refrigerant which forms heat exchange with the first cold carrier in the second intermediate heat exchanger; and a cooling tower cooling cycle having a second cold carrier which can form heat exchange with the first cold carrier in the first intermediate heat exchanger, and can also form heat exchange with the refrigerant in the condensing heat exchanger. According to the application, at least one of the two kinds of cold sources can be controlled to form cooling for the liquid cooling cycle according to the outdoor environment temperature, the natural cold source can be used to a greater extent, the unit energy consumption in the high temperature season can be reduced, the natural cold source utilization rate in the transition season can be improved, the annual energy efficiency of the refrigeration unit can be improved, and the annual energy consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cabinet cooling, and particularly relates to an immersed liquid cooling cabinet cooling system and a control method. BACKGROUND

[0002] With the increase of data processing capacity and data transmission speed of a data center, the chip power density is increased, and the heat dissipation demand of the data center is further improved. The traditional air cooling method for cooling servers and other components needs to be equipped with fans with higher speed and larger diameter, and heat dissipation channels with larger volume to meet the demand, which leads to the increase of noise in the corresponding space, the aggravation of environmental heat influence, and the rise of construction cost and operation cost. In order to meet the needs of the development of the data center, the development of immersed liquid cooling technology has become the most ideal data center refrigeration scheme.

[0003] The existing immersed liquid cooling technology is mainly divided into direct cooling and indirect cooling. The indirect cooling is mainly cold plate liquid cooling, and the direct cooling includes single-phase immersed liquid cooling, two-phase immersed liquid cooling and single-phase spray liquid cooling. The single-phase immersed liquid cooling is to immerse the server directly in the electronic fluorinated liquid, so that each electronic component on the server exchanges heat, the electronic fluorinated liquid absorbs heat therefrom and then releases heat through an external circulation cooling source, so as to realize the overall cooling circulation of the server. Compared with the two-phase immersed liquid cooling, the single-phase immersed liquid cooling is simpler and has a relatively lower price, and there is no need to consider the problems of vapor escape and cooling liquid selection during phase change.

[0004] The inventors find that the immersed liquid cooling cabinet cooling system in the prior art mainly adopts a single external circulation cooling source, such as one of cooling water circulation of a cooling tower or refrigerant circulation of a compressor. The single external circulation cooling source is difficult to have a high energy efficiency when the external environment is in high-temperature or low-temperature working conditions, and thus the overall energy consumption of the unit cooling system is high and the energy efficiency is low throughout the year. SUMMARY

[0005] Therefore, the application provides an immersed liquid cooling cabinet cooling system and a control method, which can solve the technical problems that the cabinet cooling system in the prior art cannot have a high energy efficiency by adopting a single external circulation cooling source, and the overall energy consumption of the unit cooling system is high and the energy efficiency is low throughout the year.

[0006] In order to solve the above problems, the application provides an immersed liquid cooling cabinet cooling system, which comprises:

[0007] A liquid cooling circulation, comprising a liquid cooling tail end, a first liquid pump, a first intermediate heat exchanger and a second intermediate heat exchanger connected by pipelines, the first liquid pump is used to drive a first cold-carrying working medium to circulate in the liquid cooling circulation, and a heat dissipation device is immersed in the first cold-carrying working medium in the liquid cooling tail end;

[0008] The compressor refrigeration cycle comprises a compressor, a throttling element and a condenser heat exchanger connected in series, the refrigerant in the discharge line of the compressor exchanges heat with the first cold carrier medium in the second intermediate heat exchanger;

[0009] The cooling tower cooling cycle comprises a second liquid pump for driving the second cold carrier medium to circulate in the cooling tower cooling cycle, and the second cold carrier medium can exchange heat with the first cold carrier medium in the first intermediate heat exchanger, and can exchange heat with the refrigerant in the condenser heat exchanger.

[0010] In some embodiments,

[0011] The liquid cooling cycle further comprises a first flow path control valve group connected to the first side of the first intermediate heat exchanger, and a second flow path control valve group connected to the first side of the second intermediate heat exchanger, the compressor refrigeration cycle further comprises a third flow path control valve group connected to the second side of the condenser heat exchanger, and the cooling tower cooling cycle further comprises a fourth flow path control valve group connected to the second side of the first intermediate heat exchanger, the first, second, third and fourth flow path control valve groups can adjust the positions where the first, second and refrigerant exchange heat.

[0012] In some embodiments,

[0013] The first pipe is connected to the first cold carrier medium inlet on the first side of the first intermediate heat exchanger, the second pipe is connected to the first cold carrier medium outlet on the first side of the first intermediate heat exchanger, the first flow path control valve group comprises a first solenoid valve connected in series on the first pipe and a second solenoid valve connected in series on the second pipe; the third pipe is connected to the first cold carrier medium inlet on the first side of the second intermediate heat exchanger, and the fourth pipe is connected to the first cold carrier medium outlet on the first side of the second intermediate heat exchanger, the second flow path control valve group comprises a third solenoid valve connected in series on the third pipe and a fourth solenoid valve connected in series on the fourth pipe, the first and second pipes and the third and fourth pipes away from the first and second intermediate heat exchangers are connected in parallel to a fifth pipe, the first flow path control valve group further comprises a fifth solenoid valve connected in series on the fifth pipe and between the first and second pipes, and the second flow path control valve group further comprises a sixth solenoid valve connected in series on the fifth pipe and between the third and fourth pipes.

[0014] In some embodiments,

[0015] The sixth pipeline is connected to the second cold-carrying medium inlet of the second side of the condensing heat exchanger, the seventh pipeline is connected to the second cold-carrying medium outlet of the second side of the condensing heat exchanger, the third flow path control valve group comprises a seventh electromagnetic valve connected in series to the sixth pipeline and an eighth electromagnetic valve connected in series to the seventh pipeline; the eighth pipeline is connected to the second cold-carrying medium inlet of the second side of the first intermediate heat exchanger, the ninth pipeline is connected to the second cold-carrying medium outlet of the second side of the first intermediate heat exchanger, the fourth flow path control valve group comprises a ninth electromagnetic valve connected in series to the eighth pipeline and a tenth electromagnetic valve connected in series to the ninth pipeline; the sixth pipeline, the seventh pipeline, the end of the eighth pipeline away from the first intermediate heat exchanger and the end of the ninth pipeline away from the condensing heat exchanger are connected in parallel to a tenth pipeline, the third flow path control valve group further comprises an eleventh electromagnetic valve connected in series to the tenth pipeline and between the sixth pipeline and the seventh pipeline, and the fourth flow path control valve group further comprises a twelfth electromagnetic valve connected in series to the tenth pipeline and between the eighth pipeline and the ninth pipeline.

[0016] In some embodiments,

[0017] The cooling tower cooling cycle further comprises a liquid feeding pipe and a liquid returning pipe, wherein the outlet of the liquid feeding pipe is communicated with the end of the eighth pipeline away from the first intermediate heat exchanger, and a thirteenth electromagnetic valve is connected in series to the liquid feeding pipe, the liquid returning pipe is communicated with the end of the seventh pipeline away from the condensing heat exchanger, and a fourteenth electromagnetic valve is connected in series to the liquid returning pipe; and / or a first liquid treatment device is connected in series to the liquid returning pipe, and / or a second liquid treatment device is connected in series to the pipeline between the first liquid pump and the first pipeline.

[0018] In some embodiments,

[0019] A fifteenth electromagnetic valve is connected in series to one of the liquid inlet pipe and the liquid outlet pipe of the liquid cooling terminal, and a flow regulating valve is connected in series to the other one; and / or the liquid cooling terminal has a plurality of liquid cooling terminals which are connected in parallel in the liquid cooling cycle.

[0020] In some embodiments,

[0021] The liquid cooling cycle further comprises a cold storage device, the cold storage device is connected to the liquid inlet pipe of the liquid cooling terminal through a fifth flow path control valve group, and the fifth flow path control valve group can control the first cold-carrying medium in the liquid inlet pipe to flow through or not to flow through the cold storage device.

[0022] In some embodiments,

[0023] The fifth flow path control valve group includes a sixteenth electromagnetic valve connected in series to an inlet pipe of the cold storage device, a seventeenth electromagnetic valve connected in series to an outlet pipe of the cold storage device, and an eighteenth electromagnetic valve connected in series to the liquid inlet pipe and between the inlet pipe and the outlet pipe.

[0024] The application also provides a control method of the submerged liquid cooling cabinet cooling system, comprising the following steps:

[0025] Obtaining an outdoor environment temperature Tout;

[0026] According to the temperature interval in which the Tout is located, the heat exchange positions of the first cold carrier medium in the liquid cooling cycle, the refrigerant in the compressor refrigeration cycle, and the second cold carrier medium in the cooling tower cooling cycle are controlled and adjusted.

[0027] In some embodiments, according to the temperature interval in which the Tout is located, the heat exchange positions of the first cold carrier medium in the liquid cooling cycle, the refrigerant in the compressor refrigeration cycle, and the second cold carrier medium in the cooling tower cooling cycle are controlled and adjusted, comprising:

[0028] When Tout>T3, the first cold carrier medium and the refrigerant are controlled to exchange heat at the second intermediate heat exchanger 52, and the second cold carrier medium and the refrigerant are controlled to exchange heat at the condensation heat exchanger 51; or,

[0029] When T3≥Tout>T2, the first cold carrier medium and the second cold carrier medium are controlled to exchange heat at the first intermediate heat exchanger, the first cold carrier medium and the refrigerant are controlled to exchange heat at the second intermediate heat exchanger, and the second cold carrier medium after exchanging heat with the first cold carrier medium is controlled to exchange heat with the refrigerant again at the condensation heat exchanger; or,

[0030] When T2≥Tout>T1, the first cold carrier medium and the second cold carrier medium are controlled to exchange heat at the first intermediate heat exchanger; or,

[0031] When T1≥Tout, the first cold carrier medium and the refrigerant are controlled to exchange heat at the second intermediate heat exchanger, and the refrigerant exchanges heat with the external environment air at the condensation heat exchanger;

[0032] The first preset ring temperature T1 is less than the second preset ring temperature T2, and the second preset ring temperature T2 is less than the third preset ring temperature T3.

[0033] In some embodiments, when the cold storage device is included, the control method further comprises:

[0034] Judging whether the power grid reaches a low valley period or a peak period;

[0035] When the power grid reaches the low valley period, the first cold carrier in the liquid inlet pipe is controlled to enter the cold storage device for cold storage, and after the cold storage is completed, the first cold carrier is cut off into the cold storage device.

[0036] When the cold storage device is fully charged and the power grid reaches the peak period, the first cold carrier in the liquid inlet pipe is controlled to enter the cold storage device to release cold from the cold storage device to the first cold carrier, and after the cold is released, the first cold carrier is cut off into the cold storage device.

[0037] The present application provides an immersion liquid cooling cabinet cooling system and control method, which has the following beneficial effects:

[0038] At the same time, the compressor refrigeration cycle and the cooling tower cooling cycle are provided as two kinds of cold sources, so that at least one of the two kinds of cold sources can be controlled to form cooling for the liquid cooling cycle according to the outdoor environment temperature, the natural cold source can be used to a large extent, the energy consumption of the unit in high temperature season can be reduced, and the utilization rate of the natural cold source in the transition season can be improved, so that the annual energy efficiency of the refrigeration unit (cooling system) can be improved, and the overall energy consumption of the refrigeration unit in a year can be reduced.

[0039] The first cold carrier can flow through or not flow through the cold storage device by controlling the on-off of the fifth flow path control valve group, so that the cold storage capacity can be released in the power valley period, thereby realizing the effects of energy saving, consumption reduction and peak shifting, and reducing the operation and maintenance cost of the data center to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0041] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the limiting conditions that the present application can be implemented, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the present application can produce, should still fall within the scope of the technical content disclosed by the present application.

[0042] Figure 1 The principle diagram of the immersion liquid cooling cabinet cooling system of the embodiment of the present application is shown in the figure;

[0043] Figure 2High temperature cooling mode operation schematic diagram of the immersion liquid cooling cabinet cooling system of the present application;

[0044] Figure 3 Normal cooling mode operation schematic diagram of the immersion liquid cooling cabinet cooling system of the present application;

[0045] Figure 4 Natural cooling mode operation schematic diagram of the immersion liquid cooling cabinet cooling system of the present application;

[0046] Figure 5 Low temperature cooling mode operation schematic diagram of the immersion liquid cooling cabinet cooling system of the present application;

[0047] Figure 6 System operation control method schematic diagram of the immersion liquid cooling cabinet cooling system of another embodiment of the present application.

[0048] The reference signs are represented as:

[0049] 1, liquid cooling end;

[0050] 21, first liquid pump; 22, second liquid pump;

[0051] 31, second liquid treatment device; 32, first liquid treatment device;

[0052] 4, first intermediate heat exchanger;

[0053] 51, condensing heat exchanger; 52, second intermediate heat exchanger;

[0054] 6, throttling element;

[0055] 7, compressor;

[0056] 8, cold storage device;

[0057] 9, flow regulating valve;

[0058] 101, fifteenth solenoid valve; 102, fifth solenoid valve; 103, second solenoid valve; 104, first solenoid valve; 105, ninth solenoid valve; 106, tenth solenoid valve; 107, twelfth solenoid valve; 108, thirteenth solenoid valve; 109, fourteenth solenoid valve; 110, eleventh solenoid valve; 111, seventh solenoid valve; 112, eighth solenoid valve; 113, fourth solenoid valve; 114, third solenoid valve; 115, sixth solenoid valve; 116, sixteenth solenoid valve; 117, eighteenth solenoid valve; 118, seventeenth solenoid valve. DETAILED DESCRIPTION

[0059] Clearly, only the embodiments described are merely a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one example embodiment is merely illustrative in nature and is in no way limiting to the application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of the present application.

[0060] It should be noted that the terms used herein are merely for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the terms "comprise" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0061] It should be understood that the term "and / or" used herein merely describes an association relationship of associated objects, and means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0062] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting to the scope of the present application. It should be understood that the dimensions of the various parts shown in the drawings are not necessarily to scale. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the application. In all examples shown and discussed herein, any specific value should be interpreted as merely illustrative, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0064] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0065] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore cannot be understood as a limitation on the scope of protection of the present application.

[0066] For reference Figure 1 and Figure 6 According to an embodiment of the present application, an immersion liquid cooling cabinet cooling system is provided, as shown in Figure 1 The cooling system comprises:

[0067] A liquid cooling cycle comprising a liquid cooling terminal 1, a first liquid pump 21, a first intermediate heat exchanger 4 and a second intermediate heat exchanger 52 connected by pipelines, the first liquid pump 21 is used to drive the first cold-carrying working medium to circulate in the liquid cooling cycle, and the equipment to be cooled is immersed in the first cold-carrying working medium in the liquid cooling terminal 1, so that the cooling of the equipment to be cooled can be realized by the phase change of the first cold-carrying working medium, the equipment to be cooled can be a server of a data center, and the first cold-carrying working medium can be an electronic fluorinated liquid or mineral oil which can realize immersion liquid cooling cycle;

[0068] The compressor refrigeration cycle comprises a compressor 7, a throttling element 6 and a condensing heat exchanger 51 connected by pipelines, the refrigerant in the exhaust pipeline of the compressor 7 exchanges heat with the first cold carrier working medium in the second intermediate heat exchanger 52, that is, the second intermediate heat exchanger 52 is shared by the compressor refrigeration cycle and the liquid cooling cycle, and the working media in the corresponding pipelines of the two cycles can exchange heat in the second intermediate heat exchanger 52. The refrigerant is specifically the refrigerant in the current compressor refrigeration cycle system, and the second intermediate heat exchanger 52 specifically serves as the evaporation side of the compressor refrigeration cycle, and the condensing heat exchanger 51 specifically serves as the condensing side of the compressor refrigeration cycle.

[0069] The cooling tower cooling cycle comprises a cooling tower (not shown in the figure), a second liquid pump 22 for driving the second cold carrier working medium to circulate in the cooling tower cooling cycle, and the second cold carrier working medium can exchange heat with the first cold carrier working medium in the first intermediate heat exchanger 4, and the second cold carrier working medium can also exchange heat with the refrigerant in the condensing heat exchanger 51. In one specific embodiment, the second cold carrier working medium can specifically use cooling water.

[0070] The liquid cooling cabinet cooling system in the technical solution simultaneously has two cold sources of the compressor refrigeration cycle and the cooling tower cooling cycle, so that at least one of the two cold sources can be controlled to cool the liquid cooling cycle according to the outdoor environment temperature, the natural cold source can be used to a large extent, the energy consumption of the unit in the high-temperature season is reduced, the utilization rate of the natural cold source in the transition season is improved, and therefore the annual energy efficiency of the refrigeration unit (cooling system) is improved, and the overall annual energy consumption of the refrigeration unit is reduced. It should be noted that the liquid cooling cycle in the application is a kind of immersed liquid cooling cycle, and the immersed liquid cooling cycle is used to dissipate heat from the equipment to be cooled in the liquid cooling terminal 1, so that the energy consumption of the data center cooling system can be greatly reduced, the terminal cooling capacity can be enhanced, and the control difficulty and operating noise of the data center cooling system can be reduced.

[0071] In some embodiments,

[0072] The liquid cooling cycle further comprises a first flow path control valve group (not labeled in the figure) connected to the first side of the first intermediate heat exchanger 4 and a second flow path control valve group (not labeled in the figure) connected to the first side of the second intermediate heat exchanger 52, the compressor refrigeration cycle further comprises a third flow path control valve group (not labeled in the figure) connected to the second side of the condensing heat exchanger 51, and the cooling tower cooling cycle further comprises a fourth flow path control valve group (not labeled in the figure) connected to the second side of the first intermediate heat exchanger 4. The first flow path control valve group, the second flow path control valve group, the third flow path control valve group and the fourth flow path control valve group can adjust the heat exchange position between the first cold carrier working medium, the second cold carrier working medium and the refrigerant.

[0073] In the technical solution, the first flow path control valve group, the second flow path control valve group, the third control valve group and the fourth control valve group are used to adjust the flow directions of the first cold-carrying medium, the second cold-carrying medium and the refrigerant, and then adjust the heat exchange positions of the three heat exchange media, so that the cooling system pipeline arrangement of the architecture is reasonable and the structure is compact.

[0074] As a specific implementation, the first pipeline is connected to the first cold-carrying medium inlet on the first side of the first intermediate heat exchanger 4, the second pipeline is connected to the first cold-carrying medium outlet on the first side of the first intermediate heat exchanger 4, the first flow path control valve group includes a first electromagnetic valve 104 connected in series on the first pipeline and a second electromagnetic valve 103 connected in series on the second pipeline; the third pipeline is connected to the first cold-carrying medium inlet on the first side of the second intermediate heat exchanger 52, the fourth pipeline is connected to the first cold-carrying medium outlet on the first side of the second intermediate heat exchanger 52, the second flow path control valve group includes a third electromagnetic valve 114 connected in series on the third pipeline and a fourth electromagnetic valve 113 connected in series on the fourth pipeline, the first pipeline, the second pipeline, the end of the third pipeline away from the second intermediate heat exchanger 52 and the end of the fourth pipeline away from the second intermediate heat exchanger 52 are connected in parallel on a fifth pipeline, the first flow path control valve group further includes a fifth electromagnetic valve 102 connected in series on the fifth pipeline and between the first pipeline and the second pipeline, and the second flow path control valve group further includes a sixth electromagnetic valve 115 connected in series on the fifth pipeline and between the third pipeline and the fourth pipeline.

[0075] The sixth pipeline is connected to the second cold-carrying medium inlet of the second side of the condensing heat exchanger 51, the seventh pipeline is connected to the second cold-carrying medium outlet of the second side of the condensing heat exchanger 51, the third flow path control valve group comprises a seventh electromagnetic valve 111 connected in series on the sixth pipeline and an eighth electromagnetic valve 112 connected in series on the seventh pipeline; the eighth pipeline is connected to the second cold-carrying medium inlet of the second side of the first intermediate heat exchanger 4, the ninth pipeline is connected to the second cold-carrying medium outlet of the second side of the first intermediate heat exchanger 4, the fourth flow path control valve group comprises a ninth electromagnetic valve 105 connected in series on the eighth pipeline and a tenth electromagnetic valve 106 connected in series on the ninth pipeline; the sixth pipeline, the seventh pipeline, the end away from the condensing heat exchanger 51 of the eighth pipeline and the end away from the first intermediate heat exchanger 4 of the ninth pipeline are connected in parallel on a tenth pipeline, the third flow path control valve group further comprises an eleventh electromagnetic valve 110 connected in series on the tenth pipeline and between the sixth pipeline and the seventh pipeline, and the fourth flow path control valve group further comprises a twelfth electromagnetic valve 107 connected in series on the tenth pipeline and between the eighth pipeline and the ninth pipeline. In the technical solution, the flow direction adjustment of each refrigerant is realized by controlling the on-off of the electromagnetic valves on each pipeline, and the flow direction control is realized by the on-off of the electromagnetic valves, so that the control is simple and reliable.

[0076] In some embodiments, the cooling tower cooling cycle further comprises a liquid feeding pipe (not labeled in the figure) and a liquid return pipe (not labeled in the figure), wherein the outlet of the liquid feeding pipe is communicated with the end away from the first intermediate heat exchanger 4 of the eighth pipeline, and a thirteenth electromagnetic valve 108 is connected in series on the liquid feeding pipe, the liquid return pipe is communicated with the end away from the condensing heat exchanger 51 of the seventh pipeline, and a fourteenth electromagnetic valve 109 is connected in series on the liquid return pipe, by controlling the on-off of the thirteenth electromagnetic valve 108 and the fourteenth electromagnetic valve 109, the flow of the second cold-carrying medium can be completely cut off in the working condition without the participation of the cooling tower cooling cycle in cooling heat dissipation, and meanwhile, the design is also convenient for the maintenance of the cooling tower cooling cycle on the pipeline of the first intermediate heat exchanger 4 and the condensing heat exchanger 51.

[0077] In a preferred embodiment, a first liquid treatment device 32 is connected in series on the liquid return pipe, and / or a second liquid treatment device 31 is connected in series on the pipeline between the first liquid pump 21 and the first pipeline, for filtering and cleaning the first cold-carrying medium and the second cold-carrying medium.

[0078] In some embodiments, a fifteenth electromagnetic valve 101 is connected in series on one of the liquid inlet pipe (not labeled in the figure) and the liquid outlet pipe (not labeled in the figure) of the liquid cooling terminal 1, and a flow regulating valve 9 is connected in series on the other one; and / or the liquid cooling terminal 1 has a plurality of liquid cooling terminals 1 connected in parallel in the liquid cooling cycle.

[0079] In the technical solution, the flow regulating valve 9 is located in the liquid cooling terminal 1, and the cooling liquid flow can be adjusted according to the real-time load change of the liquid cooling terminal 1 to adapt to the reasonable distribution of cooling capacity.

[0080] In another possible embodiment, the liquid cooling cycle further comprises a cold storage device 8 connected with an inlet pipe of the liquid cooling terminal 1 through a fifth flow path control valve group (not shown in the figure), and the fifth flow path control valve group can control the first cold carrier medium in the inlet pipe to flow through or not to flow through the cold storage device 8. Specifically, the fifth flow path control valve group comprises a sixteenth electromagnetic valve 116 connected in series on an inlet pipe of the cold storage device 8, a seventeenth electromagnetic valve 118 connected in series on an outlet pipe of the cold storage device 8, and an eighteenth electromagnetic valve 117 connected in series on the inlet pipe and between the inlet pipe and the outlet pipe.

[0081] In the technical solution, the first cold carrier medium can flow through or not to flow through the cold storage device 8 by controlling the on-off of the fifth flow path control valve group, so that the cold storage capacity can be released during the off-peak period of the power grid, thereby realizing the effects of energy saving and consumption reduction, peak-shifting electricity use, and reducing the operation and maintenance cost of the data center to a certain extent.

[0082] According to the embodiments of the present application, a control method of the above-mentioned immersion liquid cooling cabinet cooling system is also provided, comprising the following steps:

[0083] Obtaining an outdoor environment temperature Tout;

[0084] According to the temperature interval in which the Tout is located, the heat exchange positions of the first cold carrier medium in the liquid cooling cycle, the refrigerant in the compressor refrigeration cycle, and the second cold carrier medium in the cooling tower cooling cycle are controlled and adjusted.

[0085] In the technical solution, at least one of the two kinds of cold sources is controlled to form cooling for the liquid cooling cycle according to the high and low of the outdoor environment temperature, so that the natural cold source can be utilized to a large extent, the energy consumption of the unit in the high temperature season is reduced, and the utilization rate of the natural cold source in the transition season is improved, thereby the annual energy efficiency of the refrigeration unit (cooling system) can be improved, and the overall annual energy consumption of the refrigeration unit is reduced.

[0086] For reference Figure 6 As shown, according to the temperature interval in which the Tout is located, the heat exchange positions of the first cold carrier medium in the liquid cooling cycle, the refrigerant in the compressor refrigeration cycle, and the second cold carrier medium in the cooling tower cooling cycle are controlled and adjusted, comprising:

[0087] When Tout > T3, the first cooling medium and the refrigerant exchange heat at the second intermediate heat exchanger 52, and the second cooling medium and the refrigerant exchange heat at the condenser heat exchanger 51. At this time, the outdoor temperature is high, and the cooling system operates in high-temperature cooling mode. See [link / reference]. Figure 2 As shown, in this mode: liquid cooling terminal 1, first liquid pump 21, second liquid pump 22, first liquid processing device 32, second liquid processing device 31, condenser heat exchanger 51, second intermediate heat exchanger 52, throttling element 6, compressor 7, cold storage device 8, flow regulating valve 9, and solenoid valves 101, 102, 107, 108, 109, 111, 112, 113, 114, and 117 are open, and the remaining components are closed. At this time, the system starts the cooling tower and the refrigeration unit. On the cooling water system side, the cooling tower exchanges heat with the outside air to provide cooling water, and the second liquid pump 22 pumps the cooling water to the condenser heat exchanger 51 to cool the condenser end of the refrigeration unit. In the refrigeration unit system, the refrigerant dissipates heat in the condenser heat exchanger 51. After being throttled by the throttling element 6, it exchanges heat with the coolant system in the second intermediate heat exchanger 52. After being compressed by the compressor 7, it exchanges heat with the cooling water in the condenser heat exchanger 51. In the coolant system, the coolant exchanges heat in the second intermediate heat exchanger 52 and then reaches the liquid cooling terminal 1 to cool the server in the liquid cooling cabinet. Then, the first liquid pump 21 pumps it to the second intermediate heat exchanger 52 to dissipate heat and complete one cycle.

[0088] When T3 ≥ Tout > T2, the first and second refrigerants exchange heat at the first intermediate heat exchanger 4, and the first refrigerant exchanges heat with the refrigerant at the second intermediate heat exchanger 52. Furthermore, the second refrigerant, after exchanging heat with the first refrigerant, exchanges heat again with the refrigerant at the condenser heat exchanger 51. At this time, the outdoor temperature is high, and the cooling system operates in normal cooling mode. See [link / reference]. Figure 3As shown, in this mode: the liquid cooling terminal 1, the first liquid pump 21, the second liquid pump 22, the first liquid treatment device 32, the second liquid treatment device 31, the first intermediate heat exchanger 4, the condensing heat exchanger 51, the second intermediate heat exchanger 52, the throttling element 6, the compressor 7, the cold storage device 8, the flow regulating valve 9, the electromagnetic valves 101, 103, 104, 105, 106, 108, 109, 111, 112, 113, 114, and 117 are opened, and the rest of the components are closed. At this time, the system opens the cooling tower and opens the refrigeration unit, and on the cooling water system side (i.e., the cooling tower cooling cycle, the same below), heat exchange is performed between the cooling tower and the outside air to provide cooling water, the cooling liquid (i.e., the first cold-carrying medium above, the same below) is pre-cooled by the first intermediate heat exchanger 4, and then the cooling water is pumped by the second liquid pump 22 to the condensing heat exchanger 51 to cool the condensing end of the refrigeration unit; in the refrigeration unit system (i.e., the compressor refrigeration cycle above, the same below), the refrigerant is cooled in the condensing heat exchanger 51, is throttled by the throttling element 6, and is heat-exchanged with the cooling liquid system (i.e., the liquid cooling cycle above, the same below) in the second intermediate heat exchanger 52, is compressed by the compressor 7, and is heat-exchanged with the cooling water (i.e., the second cold-carrying medium above, the same below) in the condensing heat exchanger 51; in the cooling liquid system, the cooling liquid is first heat-exchanged with the cooling water in the first intermediate heat exchanger 4 to complete pre-cooling, is heat-exchanged in the second intermediate heat exchanger 52 to complete re-cooling, and then reaches the liquid cooling terminal 1 to cool the server in the liquid cooling cabinet (i.e., the equipment to be cooled above, the same below), and is pumped by the first liquid pump 21 to the first intermediate heat exchanger 4 to complete one cycle of cooling.

[0089] When T2≥Tout>T1, the first cold-carrying medium and the second cold-carrying medium are heat-exchanged at the first intermediate heat exchanger 4, at this time, the outdoor temperature is low, the cooling system runs in the natural cooling mode, and the system is controlled as shown in FIG. 6. Figure 4 As shown, in this mode: the liquid cooling terminal 1, the first liquid pump 21, the second liquid pump 22, the first liquid treatment device 32, the second liquid treatment device 31, the first intermediate heat exchanger 4, the cold storage device 8, the flow regulating valve 9, the electromagnetic valves 101, 103, 104, 105, 106, 108, 109, 110, 115, and 117 are opened, and the rest of the components are closed. At this time, the system opens the cooling tower and closes the refrigeration unit, and on the cooling water system side, heat exchange is performed between the cooling tower and the outside air to provide cooling water, the cooling liquid is cooled by the first intermediate heat exchanger 4, and is pumped by the second liquid pump 22 to the cooling tower to be cooled; in the cooling liquid system, the cooling liquid is heat-exchanged with the cooling water in the first intermediate heat exchanger 4 to complete cooling, reaches the liquid cooling terminal 1 to cool the server in the liquid cooling cabinet, and is pumped by the first liquid pump 21 to the first intermediate heat exchanger 4 to complete one cycle of cooling.

[0090] When T1≥Tout, the first cold-carrying medium and the refrigerant are controlled to exchange heat at the second intermediate heat exchanger 52, and the refrigerant exchanges heat with the external ambient air at the condensing heat exchanger 51. At this time, the outdoor temperature is in a low-temperature state, and the second cold-carrying medium in the cooling tower is at risk of freezing. The cooling system runs in a low-temperature cooling mode. See FIG. 5. In this mode, the liquid cooling terminal 1, the first liquid pump 21, the second liquid treatment device 31, the condensing heat exchanger 51, the second intermediate heat exchanger 52, the throttling element 6, the compressor 7, the cold storage device 8, the flow regulating valve 9, and the electromagnetic valves 101, 102, 113, 114, and 117 are opened, and the remaining components are closed. Figure 5 At this time, the system closes the cooling tower and opens the refrigeration unit. In the refrigeration unit system, the refrigerant exchanges heat at the condensing heat exchanger 51, exchanges heat at the second intermediate heat exchanger 52 after throttling by the throttling element 6, and exchanges heat at the condensing heat exchanger 51 after compression by the compressor 7. In the cooling liquid system, the cooling liquid exchanges heat at the second intermediate heat exchanger 52, cools the servers in the liquid cooling cabinet at the liquid cooling terminal 1, and is pumped by the first liquid pump 21 to the second intermediate heat exchanger 52 to complete a cycle.

[0091] The first preset ambient temperature T1, the second preset ambient temperature T2, and the third preset ambient temperature T3 are determined according to the local climate temperature and humidity distribution.

[0092] In some embodiments, when the cold storage device 8 is included, the control method further includes:

[0093] determining whether the power grid reaches a low-peak period or a peak period;

[0094] When the power grid reaches the low-peak period, the first cold-carrying medium in the liquid inlet pipe is controlled to enter the cold storage device 8 for cold storage, and the first cold-carrying medium is cut off after the cold storage is completed; or

[0095] When the cold storage device 8 is fully charged and the power grid reaches the peak period, the first cold-carrying medium in the liquid inlet pipe is controlled to enter the cold storage device 8 so that the cold storage device 8 releases cold to the first cold-carrying medium, and the first cold-carrying medium is cut off after the cold release is completed.

[0096] That is, in the operation process of the unit, whether to start the cold storage mode can be selected, when the cold storage mode is started, the cold storage device 8, the electromagnetic valve 116, 118 is opened, the electromagnetic valve 117 is closed, and the unit enters the cold storage mode; when the cold storage mode is closed, the cold storage device 8, the electromagnetic valve 116, 118 is closed, and the electromagnetic valve 117 is opened. When the unit starts the cold storage mode, the cold storage device 8 can be selected to store cold or release cold according to whether the power grid is in the peak period or the valley period, when the power grid reaches the valley period, the unit starts the cold storage mode; when the power grid reaches the peak period, the unit starts the cold release mode. Through the cold storage technology, the effect of energy saving, consumption reduction, peak shifting and power utilization of the data center can be realized.

[0097] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be regarded as the protection scope of the present application.

Claims

1. An immersion liquid-cooled cabinet cooling system, characterized by, Comprise: a liquid cooling cycle comprising a liquid cooling terminal (1), a first liquid pump (21), a first intermediate heat exchanger (4) and a second intermediate heat exchanger (52) connected by pipelines, the first liquid pump (21) being used to drive a first cold carrier to circulate in the liquid cooling cycle, and a heat dissipation device being immersed in the first cold carrier in the liquid cooling terminal (1); a compressor refrigeration cycle comprising a compressor (7), a throttling element (6) and a condenser heat exchanger (51) connected by pipelines, and a refrigerant in the exhaust pipeline of the compressor (7) forming heat exchange with the first cold carrier in the second intermediate heat exchanger (52); a cooling tower cooling cycle comprising a second liquid pump (22) used to drive a second cold carrier to circulate in the cooling tower cooling cycle, and the second cold carrier being capable of forming heat exchange with the first cold carrier in the first intermediate heat exchanger (4), and the second cold carrier being also capable of forming heat exchange with the refrigerant in the condenser heat exchanger (51).

2. The immersion liquid cooling cabinet cooling system according to claim 1, wherein: the liquid cooling cycle further comprises a first flow path control valve group connected to the first side of the first intermediate heat exchanger (4) and a second flow path control valve group connected to the first side of the second intermediate heat exchanger (52), the compressor refrigeration cycle further comprises a third flow path control valve group connected to the second side of the condenser heat exchanger (51), and the cooling tower cooling cycle further comprises a fourth flow path control valve group connected to the second side of the first intermediate heat exchanger (4), and the first, second, third and fourth flow path control valve groups are capable of adjusting the heat exchange positions among the first cold carrier, the second cold carrier and the refrigerant.

3. The immersion liquid cooling cabinet cooling system according to claim 2, wherein: The first pipeline is connected to the first cold-carrying medium inlet on the first side of the first intermediate heat exchanger (4), the second pipeline is connected to the first cold-carrying medium outlet on the first side of the first intermediate heat exchanger (4), the first flow path control valve group comprises a first electromagnetic valve (104) connected in series on the first pipeline and a second electromagnetic valve (103) connected in series on the second pipeline; the third pipeline is connected to the first cold-carrying medium inlet on the first side of the second intermediate heat exchanger (52), the fourth pipeline is connected to the first cold-carrying medium outlet on the first side of the second intermediate heat exchanger (52), the second flow path control valve group comprises a third electromagnetic valve (114) connected in series on the third pipeline and a fourth electromagnetic valve (113) connected in series on the fourth pipeline, the first pipeline, the second pipeline, the end of the third pipeline away from the second intermediate heat exchanger (52) and the end of the fourth pipeline away from the second intermediate heat exchanger (52) are connected in parallel to the fifth pipeline, the first flow path control valve group further comprises a fifth electromagnetic valve (102) connected in series on the fifth pipeline and between the first pipeline and the second pipeline, and the second flow path control valve group further comprises a sixth electromagnetic valve (115) connected in series on the fifth pipeline and between the third pipeline and the fourth pipeline.

4. The immersion liquid cooling cabinet cooling system according to claim 3, characterized in that, The sixth pipeline is connected to the second cold-carrying medium inlet on the second side of the condensing heat exchanger (51), the seventh pipeline is connected to the second cold-carrying medium outlet on the second side of the condensing heat exchanger (51), the third flow path control valve group comprises a seventh electromagnetic valve (111) connected in series on the sixth pipeline and an eighth electromagnetic valve (112) connected in series on the seventh pipeline; the eighth pipeline is connected to the second cold-carrying medium inlet on the second side of the first intermediate heat exchanger (4), the ninth pipeline is connected to the second cold-carrying medium outlet on the second side of the first intermediate heat exchanger (4), the fourth flow path control valve group comprises a ninth electromagnetic valve (105) connected in series on the eighth pipeline and a tenth electromagnetic valve (106) connected in series on the ninth pipeline; the sixth pipeline, the seventh pipeline, the end of the eighth pipeline away from the first intermediate heat exchanger (4) and the end of the ninth pipeline away from the first intermediate heat exchanger (4) are connected in parallel to the tenth pipeline, the third flow path control valve group further comprises an eleventh electromagnetic valve (110) connected in series on the tenth pipeline and between the sixth pipeline and the seventh pipeline, and the fourth flow path control valve group further comprises a twelfth electromagnetic valve (107) connected in series on the tenth pipeline and between the eighth pipeline and the ninth pipeline.

5. The immersion liquid cooling cabinet cooling system according to claim 4, characterized in that, The cooling tower cooling cycle further comprises a liquid feeding pipe and a liquid returning pipe, wherein the outlet of the liquid feeding pipe is communicated with one end of the eighth pipeline away from the first intermediate heat exchanger (4), and a thirteenth electromagnetic valve (108) is connected in series on the liquid feeding pipe; the liquid returning pipe is communicated with one end of the seventh pipeline away from the condensation heat exchanger (51), and a fourteenth electromagnetic valve (109) is connected in series on the liquid returning pipe; and / or a first liquid treatment device (32) is connected in series on the liquid returning pipe, and / or a second liquid treatment device (31) is connected in series on the pipeline between the first liquid pump (21) and the first pipeline.

6. The immersion liquid cooling cabinet cooling system according to claim 1, wherein, one of the liquid inlet pipe and the liquid outlet pipe of the liquid cooling terminal (1) is connected in series with a fifteenth electromagnetic valve (101), and the other is connected in series with a flow regulating valve (9); and / or a plurality of the liquid cooling terminals (1) are connected in parallel in the liquid cooling cycle.

7. The immersion liquid cooling cabinet cooling system according to claim 1, wherein, the liquid cooling cycle further comprises a cold storage device (8), and the cold storage device (8) is connected with the liquid inlet pipe of the liquid cooling terminal (1) through a fifth flow path control valve group, and the fifth flow path control valve group can control the first cold carrier medium in the liquid inlet pipe to flow through or not to flow through the cold storage device (8).

8. The immersion liquid cooling cabinet cooling system according to claim 7, wherein, the fifth flow path control valve group comprises a sixteenth electromagnetic valve (116) connected in series on the inlet pipe of the cold storage device (8), a seventeenth electromagnetic valve (118) connected in series on the outlet pipe of the cold storage device (8), and an eighteenth electromagnetic valve (117) connected in series on the liquid inlet pipe and between the inlet pipe and the outlet pipe.

9. A method of controlling an immersion liquid-cooled cabinet cooling system as claimed in any one of claims 1 to 8, characterized by, comprising the following steps: obtaining an outdoor environment temperature Tout; controlling the heat exchange positions of the first cold carrier medium in the liquid cooling cycle, the refrigerant in the compressor refrigeration cycle, and the second cold carrier medium in the cooling tower cooling cycle according to the temperature interval in which the Tout is located.

10. The control method of the submersion liquid cooling cabinet cooling system according to claim 9, characterized in that, controlling the heat exchange positions of the first cold carrier medium in the liquid cooling cycle, the refrigerant in the compressor refrigeration cycle, and the second cold carrier medium in the cooling tower cooling cycle according to the temperature interval in which the Tout is located, comprising: when Tout > T3, controlling the first cold carrier medium and the refrigerant to exchange heat at the second intermediate heat exchanger (52), and controlling the second cold carrier medium and the refrigerant to exchange heat at the condensation heat exchanger (51); or, when T3 ≥ Tout > T2, controlling the first cold carrier medium and the second cold carrier medium to exchange heat at the first intermediate heat exchanger (4), the first cold carrier medium and the refrigerant to exchange heat at the second intermediate heat exchanger (52), and the second cold carrier medium after heat exchange with the first cold carrier medium to exchange heat with the refrigerant again at the condensation heat exchanger (51); or, When T2≥Tout>T1, the first cold carrier and the second cold carrier are controlled to exchange heat at the first intermediate heat exchanger (4); or When T1≥Tout, the first cold carrier and the refrigerant are controlled to exchange heat at the second intermediate heat exchanger (52), and the refrigerant exchanges heat with external ambient air at the condensing heat exchanger (51); The first preset ambient temperature T1 11. The control method according to claim 9, characterized by, When the cold storage device (8) is included, the control method further comprises: judging whether the power grid reaches a low valley period or a peak period; When the power grid reaches the low valley period, the first cold carrier in the liquid inlet pipe is controlled to enter the cold storage device (8) for cold storage, and after the cold storage is completed, the first cold carrier is cut off from entering the cold storage device (8); or When the cold storage device (8) is fully charged and the power grid reaches the peak period, the first cold carrier in the liquid inlet pipe is controlled to enter the cold storage device (8) so that the cold storage device (8) releases cold to the first cold carrier, and after the cold release is completed, the first cold carrier is cut off from entering the cold storage device (8).

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