Cooling system for liquid cooling data center and control method

Abstract

The invention relates to a cooling system for a liquid cooling data center and a control method. The cooling system comprises at least two compressors, a condenser, a flash evaporator, an ejector, a cold storage device, a heat regenerator, a liquid cooling device and a plurality of valves which are connected through pipelines to form a circulation loop. The liquid cooling device at least comprises a heat exchanger and a server to be refrigerated. The plurality of valves includes at least a plurality of three-way valves disposed in respective portions of the circulation loop, a first control valve, and a second control valve. The cooling system is configured to selectively open or close the first control valve and the second control valve according to the cooling capacity requirement of the data center and adjust communication flow paths of the corresponding three-way valves so as to start one of a cold storage mode, a cold release mode and a refrigeration mode. According to the cooling system and the control method disclosed by the invention, the data center can be continuously refrigerated, so that normal operation of various devices of the data center is ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of refrigeration technology, and more particularly to a cooling system and a control method for a liquid-cooled data center. Background Art

[0002] With the vigorous development of data centers, the number of equipment such as servers and power supplies used is also increasing, which will generate a lot of heat during operation, causing the temperature in the computer room to rise and affecting the normal operation of the equipment. In order to ensure the normal operation of the equipment in the data center, the data center needs to be cooled. The existing technology has provided liquid cooling technology to cool the data center. Liquid cooling technology circulates liquid between the heat-generating components and the radiator to take away the heat, so that the heat-generating components can be cooled in a shorter time, thereby reducing the performance degradation of the equipment due to overheating. Liquid cooling technology has a high heat dissipation efficiency and is therefore widely used in data centers for cooling. However, in order to ensure the stable use of the data center, it is necessary to have sufficient cooling capacity to ensure uninterrupted operation of the cooling system even when the cooling system is shut down.

[0003] Therefore, there is a need to improve the cooling system and control method of the liquid-cooled data center. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure proposes a cooling system and a control method for a liquid-cooled data center, which can at least perform uninterrupted cooling on the data center to ensure the normal operation of various equipment in the data center.

[0005] In one aspect, a cooling system for a liquid-cooled data center is provided. The cooling system includes at least two compressors, a condenser, a flash evaporator, an ejector, a cold storage device, a heat regenerator, a liquid cooling device, and a plurality of valves connected by pipelines to form a circulation loop. The liquid cooling device includes at least a heat exchanger and a server to be cooled. The plurality of valves include at least a plurality of three-way valves, a first control valve, and a second control valve arranged in corresponding parts of the circulation loop. The cooling system is configured to selectively open and close the first control valve and the second control valve according to the cooling demand of the data center and to adjust the connecting flow path of the corresponding three-way valve to enable one of the cold storage mode, the cooling mode, and the cooling mode.

[0006] Since the cooling system can selectively control the corresponding valve among the multiple valves according to the cooling demand of the data center to enable one of the cooling modes including the cold storage mode, the cold release mode and the refrigeration mode, it can provide sufficient cold supply even when the cooling system is shut down, that is, it can continuously cool the data center to ensure the normal operation of various equipment in the data center.

[0007] In one or more embodiments, the at least two compressors include a first compressor and a second high pressure stage compressor connected in series.

[0008] Thus, a flexible step-by-step pressurization can be provided for the refrigerant. Moreover, it is convenient to be used in combination with subsequent devices to obtain intermediate air replenishment, thereby reducing the system pressure ratio, saving the power consumption in the compression process and being more energy-efficient.

[0009] In one or more embodiments, the outlet of the second high-pressure stage compressor is connected to the inlet of the condenser, the second outlet branch branching from the condenser is connected to the inlet of the flash evaporator, and the first gas phase outlet of the flash evaporator is connected to the inlet of the second high-pressure stage compressor to supply the separated gas phase refrigerant as intermediate make-up gas to the second high-pressure stage compressor.

[0010] Thus, the pressurized superheated saturated steam from the first compressor is mixed with the gaseous refrigerant from the flash evaporator and enters the high-pressure compressor, reducing the system pressure ratio, thereby reducing the energy consumption of the compressor and saving more energy.

[0011] In one or more embodiments, a first throttle valve is disposed in the second outlet branch and upstream of the inlet of the flasher.

[0012] Therefore, according to the different cooling capacity required by the liquid cooling device, the amount of gas-liquid two-phase refrigerant delivered through the second outlet branch of the condenser can be adjusted by adjusting the opening of the first throttle valve, thereby achieving the adjustment of the amount of liquid-phase refrigerant used for the cooling system.

[0013] In one or more embodiments, the regenerator is arranged in a first outlet branch branching from the outlet of the condenser and is connected in series with the heat exchanger, and the regenerator is configured to exchange heat between the gas-liquid two-phase refrigerant from the first outlet branch and the gas-phase refrigerant from the second port of the heat exchanger to obtain the liquid-phase refrigerant with increased cooling capacity that leaves the first outlet of the regenerator and is supplied to the heat exchanger, and the saturated steam that leaves the second opening of the regenerator.

[0014] Therefore, the arrangement of the regenerator can fully utilize the heat energy and cold energy in the cooling system.

[0015] In one or more embodiments, a first control valve is disposed in the first outlet branch and upstream of the first inlet of the regenerator, the first control valve being configured to open when the cold storage mode and the cooling mode are enabled and to close in the cooling release mode.

[0016] Thus, the provision of the first control valve facilitates selectively activating one of the cold storage mode, the cooling mode, and the cooling release mode.

[0017] In one or more embodiments, the second liquid phase outlet of the flasher is configured to be connected to the first control valve in the cooling mode and to be connected to the first inlet of the ejector in the cold storage mode.

[0018] Thus, the second liquid phase outlet of the flash evaporator delivers the supplementary liquid phase refrigerant in the cooling mode, and delivers the injection liquid phase refrigerant in the cold storage mode.

[0019] In one or more embodiments, the ejector further has a second inlet, a working nozzle, a mixing chamber, a diffusion chamber and an outlet, the second outlet of the regenerator is connected to the second inlet of the ejector, and the outlet of the ejector is connected to the inlet of the cold storage device.

[0020] Therefore, the setting of the ejector helps to increase the suction pressure of the subsequent compressor, save the power consumption of the compression process, reduce throttling losses, and ensure the reliability of the system. In addition, the regenerator and the ejector can be used in combination to reduce the thermodynamic losses during isenthalpic expansion. The series connection between the cold storage device and the liquid cooling device can utilize the cold stored in the cold storage agent in the cold storage device to ensure that the liquid cooling device can supply cold even in a short time after the cooling system fails or stops.

[0021] In one or more embodiments, the plurality of three-way valves include a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, and a fifth three-way valve. The first three-way valve is configured to selectively connect the second port of the heat exchanger and the second inlet of the regenerator or to connect the second port of the heat exchanger and the fourth three-way valve. The second three-way valve is configured to selectively connect the outlet of the ejector and the inlet of the cold storage device or to connect the first port of the heat exchanger and the inlet of the cold storage device. The third three-way valve is configured to selectively connect the second outlet of the regenerator and the second inlet of the ejector or to connect the second outlet of the regenerator and the fourth three-way valve. The fourth three-way valve is configured to selectively connect the outlet of the cold storage device and the first three-way valve or to connect the third three-way valve and the second control valve. The fifth three-way valve may be configured to selectively connect the second outlet of the flash evaporator and the first control valve or to connect the second outlet of the flash evaporator and the first inlet of the ejector.

[0022] Thus, the corresponding circulation loop is selectively connected by adjusting the corresponding three-way valve to enable one of the cold storage mode, the cold release mode and the refrigeration mode.

[0023] In one or more embodiments, the cooling system is configured to connect at least the second port of the heat exchanger, the first three-way valve, the heat regenerator, the third three-way valve, the ejector, the second three-way valve, the cold storage device, the second control valve and the inlet of the first compressor in series in sequence when the cold storage mode is enabled, thereby connecting the cold storage circulation loop.

[0024] Thus, the cold storage mode is enabled by opening the first control valve and the second control valve and selectively connecting the corresponding three-way valves to connect the cold storage circulation loop.

[0025] In one or more embodiments, the cooling system is configured to connect at least the second port of the heat exchanger, the first three-way valve, the heat regenerator, the third three-way valve, the fourth three-way valve, the second control valve and the inlet of the first compressor in series in sequence when the refrigeration mode is enabled by opening the first control valve and the second control valve and selectively connecting the flow paths of the first three-way valve, the third three-way valve, the fourth three-way valve and the fifth three-way valve, thereby connecting the refrigeration cycle circuit.

[0026] Thus, the refrigeration cycle is connected by opening the first control valve and the second control valve and selectively connecting the corresponding three-way valve to activate the cooling mode.

[0027] In one or more embodiments, the cooling system is configured to connect at least the first port of the heat exchanger, the second three-way valve, the cold storage device, the fourth three-way valve, the pump and the first three-way valve and the second port of the heat exchanger in series in sequence when the cooling mode is enabled by closing the first control valve and the second control valve and selectively connecting the flow paths of the first three-way valve, the second three-way valve and the fourth three-way valve, thereby connecting the cooling circulation loop.

[0028] Thus, the cooling mode is enabled by closing the first control valve and the second control valve and selectively connecting the corresponding three-way valves to connect the cooling circulation loop.

[0029] In one or more embodiments, the second liquid phase outlet of the flash evaporator is connected to the first inlet of the ejector by means of a fifth three-way valve in the cold storage mode to provide liquid phase refrigerant for injection.

[0030] Since the saturated steam is separated, the specific enthalpy of the liquid phase refrigerant output from the second liquid phase outlet of the flash evaporator is reduced, thereby increasing the refrigeration capacity per unit mass. In addition, the combined use of the condenser, flash evaporator and ejector can reduce the thermodynamic loss during isenthalpic expansion.

[0031] In one or more embodiments, the outlet of the ejector is connected in series to the inlet of the cold storage device through a second three-way valve.

[0032] Therefore, the cold storage device has the dual functions of preventing liquid from being carried in the air sucked into the compressor inlet and storing cold energy in the cold storage mode.

[0033] In one or more embodiments, the second liquid phase outlet of the flash evaporator is connected to the first control valve via a fifth three-way valve in the cooling mode to provide supplementary liquid phase refrigerant.

[0034] As the saturated steam is separated out, the specific enthalpy of the liquid-phase refrigerant output from the second liquid-phase outlet of the flash evaporator is reduced, thereby increasing the refrigeration capacity per unit mass, thereby providing greater cooling capacity for the subsequent circulation loop.

[0035] In one or more embodiments, a pump is disposed between the fourth three-way valve and the first three-way valve to provide power for driving the circulation of the refrigerant in the cooling mode.

[0036] Thus, the arrangement of the pump facilitates smooth circulation of the refrigerant in the cooling mode.

[0037] In one or more embodiments, the second throttle valve is disposed between the first outlet of the regenerator and the first port of the heat exchanger.

[0038] Therefore, according to actual needs, the operator can control the amount of liquid-phase refrigerant entering the liquid cooling device by adjusting the opening of the second throttle valve.

[0039] In one or more embodiments, the cold storage device includes a heat exchange tube encapsulated in a shell and a phase-change cold storage agent, and the phase-change cold storage agent is filled around the heat exchange tube.

[0040] Therefore, the cold storage device adopts the phase change latent heat cold storage method to store cold, and the temperature is close to constant during the phase change process of the cold storage agent, which is beneficial to controlling the temperature of the cold storage device.

[0041] In one or more embodiments, the cold storage device includes a capacity monitor disposed in the housing, and when the capacity monitor detects that the capacity of the cold storage device reaches 95%, the cooling system switches from the cold storage mode to the refrigeration mode.

[0042] Thus, the cooling system can switch between the cold storage mode and the cooling mode according to the cold storage capacity.

[0043] In one or more embodiments, the temperature and pressure sensor is disposed adjacent to the heat exchanger on a chassis encapsulating the heat exchanger and the server.

[0044] Thus, the temperature and pressure sensors are used to detect the temperature and pressure inside the chassis, so that the operator can control the amount of liquid refrigerant flowing through the liquid cooling device according to the cooling demand of the data center.

[0045] In one or more embodiments, selective communication of the third three-way valve allows the cooling system to switch between the cold storage mode and the refrigeration mode.

[0046] Thereby, activation of the cold storage mode and the cooling mode is switched in a simple manner.

[0047] On the other hand, a control method for controlling a cooling system according to the present disclosure is provided, and the control method includes the following steps: selectively opening and closing a first control valve and a second control valve and selectively connecting a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve and a fifth three-way valve.

[0048] Thereby, activation of one of the cold storage mode, the cooling mode, and the cooling release mode is switched in a simple manner.

[0049] In one or more embodiments, selectively controlling corresponding valves of the plurality of valves includes opening the first control valve and the second control valve when the cold storage mode and the cooling mode are enabled, and closing the first control valve and the second control valve when the cooling release mode is enabled.

[0050] Thereby, activation of one of the cold storage mode, the cooling mode, and the cooling release mode is switched in a simple manner.

[0051] In one or more embodiments, selective communication of the third three-way valve allows the cooling system to switch between a cooling mode and a cold storage mode.

[0052] Thereby, activation of the cold storage mode and the cooling mode is switched in a simple manner.

[0053] In one or more embodiments, the control method includes enabling the cold storage mode by performing the following steps: opening the first control valve and the second control valve and closing the fourth three-way valve; connecting the first three-way valve to the second port of the heat exchanger and the second inlet of the regenerator; connecting the third three-way valve to the second outlet of the regenerator and the second inlet of the ejector; connecting the second three-way valve to the outlet of the ejector and the inlet of the cold storage device; and connecting the fifth three-way valve to the second liquid phase outlet of the flash evaporator and the first inlet of the emitter.

[0054] As a result, activation of the cold storage mode is achieved in a simple manner.

[0055] In one or more embodiments, the control method includes enabling the refrigeration mode by performing the following steps: opening the first control valve and the second control valve; connecting the first three-way valve to the second port of the heat exchanger and the second inlet of the regenerator; connecting the third three-way valve to the second outlet of the regenerator and the fourth three-way valve; connecting the fourth three-way valve to the third three-way valve and the second control valve; and connecting the fifth three-way valve to the second liquid phase outlet of the flash evaporator and the first control valve.

[0056] Activation of the cooling mode is thereby achieved in a simple manner.

[0057] In one or more embodiments, the control method includes enabling the cooling mode by performing the following steps: closing the first control valve and the second control valve and starting the pump; connecting the second three-way valve to the first port of the heat exchanger and the inlet of the cold storage device; connecting the fourth three-way valve to the outlet of the cold storage device and the first three-way valve; and connecting the first three-way valve to the fourth three-way valve and the second port of the heat exchanger.

[0058] The activation of the cooling mode is thereby achieved in a simple manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present disclosure will be more easily understood by the following detailed description in conjunction with the accompanying drawings, in which the same reference numerals represent the same elements. The accompanying drawings are schematic and non-restrictive. The elements in the accompanying drawings are not necessarily represented to scale. For example, the elements may be enlarged for the purpose of illustration, or may be reduced in scale to keep the drawings clear and easy to understand. In the accompanying drawings:

[0060] Figure 1 The overall layout of the cooling system according to the present disclosure is schematically shown;

[0061] Figure 2 Schematically shows the flow path of the cooling system in the cold storage mode according to the present disclosure;

[0062] Figure 3 A pressure-enthalpy diagram of a cooling system in a cold storage mode according to the present disclosure is shown.

[0063] Figure 4 The flow path of the cooling system according to the present disclosure in the cooling mode is schematically shown;

[0064] Figure 5 A pressure-enthalpy diagram showing a cooling system in cooling mode according to the present disclosure; and

[0065] Figure 6 The flow path of the cooling system according to the present disclosure in the cooling mode is schematically shown. DETAILED DESCRIPTION

[0066] The present disclosure will be described below with reference to the accompanying drawings, wherein the accompanying drawings show several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in a variety of different ways and is not limited to the embodiments described below. The embodiments described below are intended to make the disclosure of the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should be understood that in all the drawings, the same reference numerals represent the same elements.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present disclosure. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The terms "including" and "having" and any derivatives thereof in the specification and claims of the present disclosure are intended to cover non-exclusive inclusions.

[0068] The terms "part," "element," "member" and the like can have the dual meaning of a single part or a plurality of parts.

[0069] In the description of the embodiments of the present disclosure, the terms "first", "second", etc. are only used to distinguish different objects, and should not be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In addition, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0070] In the description of the embodiments of the present disclosure, “plurality” means more than two, unless explicitly defined otherwise.

[0071] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0072] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0073] In the description of the embodiments of the present disclosure, the terms "distal", "proximal", "lateral", "longitudinal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present disclosure.

[0074] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the terms "installation", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0075] The prior art has provided liquid cooling technology to ensure the stable use of data centers. However, there is still a need for a cooling system and a control method so that sufficient cooling can be supplied even when the cooling system is shut down, thereby ensuring the normal operation of various devices in the data center.

[0076] In order to solve the problems of the prior art, the present disclosure provides the following concept: a cooling system may include a compressor, a condenser, a flash evaporator, an ejector, a cold storage device, a regenerator, a liquid cooling device, and a plurality of valves connected by pipelines to form a circulation loop. The cooling system is configured to selectively control a corresponding valve among the plurality of valves according to the cooling demand of the data center to enable one cooling mode among a cold storage mode, a cooling release mode, and a cooling mode, so that sufficient cooling supply can be provided even when the cooling system is shut down to ensure the normal operation of various equipment in the data center.

[0077] The cold storage mode is used to set aside a portion of the refrigerant as a redundant reserve when the system meets the cooling demand at the end, in order to cope with the possible compressor failure or shutdown, etc., to ensure the stable and reliable operation of the data center. When the capacity of the cold storage device reaches 95%, the cooling system switches to the cooling mode. When the compressor stops or the electricity price is high during the day, the cooling system switches to the cooling mode, releasing the cold stored in the cold storage device to ensure the stable operation and energy saving of the cooling system.

[0078] Figure 1 The overall layout of the cooling system according to the present disclosure is schematically shown. Figure 1 The cooling system according to the present disclosure includes at least two compressors connected by pipelines to form a circulation loop, a condenser 2, a flash evaporator 6, an ejector 3, a cold storage device 4, a liquid cooling device 5, a regenerator 10 and a plurality of valves.

[0079] The at least two compressors may be multi-stage compressors. Alternatively, the at least two compressors may include multiple compressors. Figure 1 In the example shown, at least two compressors may be two-stage compressors, that is, comprising a first compressor 1a and a second high-pressure stage compressor 1b connected in series, thereby providing a flexible stepped pressure boost for the refrigerant.

[0080] The condenser 2 may be a conventional condenser that converts a gas-phase refrigerant into a gas-liquid two-phase refrigerant through heat exchange.

[0081] The flash evaporator 6 may be a conventional flash evaporator for separating the gas-liquid two-phase refrigerant into the gas-phase refrigerant and the liquid-phase refrigerant.

[0082] The ejector 3 has a first inlet for receiving the liquid-phase refrigerant for injection and a second inlet for receiving saturated steam (i.e., gas-phase refrigerant). The working nozzle of the ejector 3 can expand the liquid-phase refrigerant for injection into low-pressure, high-speed, wet steam with low dryness, which is then fully mixed with the saturated steam from the second inlet of the ejector 3 in the mixing chamber of the ejector, and then enters the diffusion chamber of the ejector 3 to be decelerated and pressurized, and the decelerated and pressurized steam is output from the outlet of the ejector 3.

[0083] The liquid cooling device 5 includes at least a heat exchanger 52 and a server 53 to be cooled. The heat exchanger 52 is arranged adjacent to the server 53. In the liquid cooling device 5, the liquid refrigerant (for example, water) input from the first port of the heat exchanger 52 absorbs the heat released by the server 53 and becomes a gas-phase refrigerant. As a result, the liquid-phase refrigerant flowing through the heat exchanger 52 provides sufficient cooling capacity for the server 53, thereby ensuring the normal operation of the server. The chassis 54 encapsulates the heat exchanger 52 and the server 53. The temperature and pressure sensor 51 is arranged adjacent to the heat exchanger 52 in the chassis 54. The temperature and pressure sensor 51 can be used to detect the temperature and pressure in the chassis 54, so that the operator can control the amount of liquid-phase refrigerant flowing through the liquid cooling device 5 according to the cooling capacity demand of the data center. For example, the operator can control the amount of liquid-phase refrigerant entering the liquid cooling device 5 by adjusting the opening of the first throttle valve 8a and the second throttle valve 8b.

[0084] The cold storage device 4 may be a cold storage heat exchanger for cold storage and cooling release of the data center refrigeration system. For example, the cold storage device 4 may include a heat exchange tube and a cold storage agent encapsulated in a shell. The two ends of the heat exchange tube are the inlet and outlet of the cold storage device 4 respectively. The phase change cold storage agent is filled around the heat exchange tube to exchange heat with the fluid flowing through the heat exchange tube. The heat exchange tube may be in a zigzag configuration to extend the heat exchange process. The cold storage agent may be a phase change cold storage agent suitable for latent heat cold storage. The main component of the phase change cold storage agent is an alkane, a hydrated salt or a eutectic salt. The main component of the phase change cold storage agent may also be selected from other suitable materials according to actual needs. Therefore, the cold storage device 4 utilizes the latent heat of phase change in the process of cold storage / cooling release. Alternatively, the cold storage agent may also be a cold storage agent suitable for sensible heat cold storage or thermochemical cold storage. Latent heat cold storage utilizes the cold storage agent to absorb heat or release heat during the phase change process to store cold or release cold. Since this latent heat storage method has a relatively high energy density and a simple device and a small volume, in particular, the phase change process of the refrigerant is close to a constant temperature, which is conducive to controlling the temperature of the refrigerant device. Therefore, the refrigerant device 4 preferably uses a phase change refrigerant.

[0085] The cold storage device 4 may include a capacity monitor disposed on the housing. When the capacity monitor detects that the capacity of the cold storage device reaches 95%, the cooling system may switch from the cold storage mode to the cooling mode. That is, the cooling system may be configured to switch from the cold storage mode to the cooling mode when the cold storage capacity of the cold storage device reaches 95%, and to switch back to the cold storage mode when the cold storage capacity is lower. Thus, the cooling system may switch between the cold storage mode and the cooling mode according to the size of the cold storage capacity.

[0086] like Figure 1 As shown, the multiple valves of the cooling system may include two control valves, multiple three-way valves and two throttle valves respectively arranged in the corresponding parts of the circulation loop. Specifically, the two control valves may include a first control valve 11a and a second control valve 11b. The first control valve 11a is arranged upstream of the regenerator 10 and the second control valve 11b is arranged at the compressor inlet. The multiple three-way valves may include a first three-way valve 7a, a second three-way valve 7b, a third three-way valve 7c, a fourth three-way valve 7d, and a fifth three-way valve 7d to provide the flow path required for the corresponding cooling mode. The two throttle valves may include a first throttle valve 8a and a second throttle valve 8b to control the amount of the refrigerant flowing into the corresponding part of the circulation loop. By selectively opening or closing the first control valve 11a and the second control valve 11b and adjusting the connecting flow path of the corresponding three-way valve, one of the cold storage mode, the cooling mode and the cooling mode can be enabled.

[0087] The following will refer to Figure 1 The overall layout of the cooling system is described with a route starting at the outlet of the first compressor 1 a and ending at the inlet of the first compressor 1 a .

[0088] The first compressor 1a and the second high-pressure stage compressor 1b have an inlet and an outlet, respectively. The inlet of the second high-pressure stage compressor 1b is connected to the outlet of the first compressor 1a. The outlet of the second high-pressure stage compressor 1b is connected to the inlet of the condenser 2. Then, a first outlet branch and a second outlet branch are separated from the outlet of the condenser 2. The first outlet branch is connected to the first port of the heat exchanger 10 from the outlet of the condenser 2. The second outlet branch is connected to the inlet of the flash steam 6 from the outlet of the condenser 2.

[0089] The first outlet branch of the condenser 2 is connected to the first inlet of the regenerator 10. The first control valve 11a may be provided in the first outlet branch of the condenser 2 and upstream of the first inlet of the regenerator 10. The first control valve 11a is provided to be opened when the cold storage mode and the cooling mode are enabled and to be closed when the cooling release mode is enabled. That is, selectively enabling the relevant cooling mode of the cooling system requires controlling the opening or closing of the first control valve.

[0090] The first outlet of the regenerator 10 can be connected to the first port of the heat exchanger 52. Figure 1 In the example shown, the second throttle valve 8b may be disposed between the first outlet of the regenerator 10 and the first port of the heat exchanger 52 to control the amount of liquid refrigerant entering the liquid cooling device 5 by adjusting the opening of the second throttle valve 8b.

[0091] The first three-way valve 7a may be connected between the second port of the heat exchanger 52 and the second inlet of the regenerator 10 and between the second port of the heat exchanger 52 and the fourth three-way valve 7d. In other words, the first three-way valve 7a may be configured to selectively connect the second port of the heat exchanger 52 and the second inlet of the regenerator 10 or connect the second port of the heat exchanger 52 and the fourth three-way valve 7d. The third three-way valve 7c may be connected between the second outlet of the regenerator 10 and the second inlet of the ejector 3 and between the second outlet of the regenerator 10 and the fourth three-way valve 7d. In other words, the third three-way valve 7c may be configured to selectively connect the second outlet of the regenerator 10 and the second inlet of the ejector 3 or connect the second outlet of the regenerator 10 and the fourth three-way valve 7d. The second three-way valve 7b may be connected between the outlet of the ejector 3 and the inlet of the cold storage device 4 and between the first port of the heat exchanger 52 and the inlet of the cold storage device 4. In other words, the second three-way valve 7b may be configured to selectively connect the outlet of the ejector 3 and the inlet of the cold storage device 4 or the first port of the heat exchanger 52 and the inlet of the cold storage device 4. The fourth three-way valve 7d may be connected between the outlet of the cold storage device 4 and the first three-way valve 7a and between the third three-way valve 7c and the second control valve 11b. In other words, the fourth three-way valve 7d is configured to selectively connect the outlet of the cold storage device 4 and the first three-way valve 7a or the third three-way valve 7c and the second control valve 11b. The first end of the second control valve 11b is connected to the inlet of the first compressor 1a, and the second end of the second control valve 11b may be connected to the outlet of the cold storage device 4 and the fourth three-way valve 7d, respectively. The pump 9 (e.g., a liquid pump) may be provided between the fourth three-way valve 7d and the first three-way valve 7a. The pump is provided to provide power for circulating the refrigerant in the cooling mode.

[0092] The second outlet branch of the condenser 2 can be connected to the inlet of the flash evaporator 6. Figure 1 In the example shown, the first throttle valve 8a can be arranged in the second outlet branch of the condenser 2 and upstream of the inlet of the flash evaporator 6. According to the different refrigeration capacity required by the liquid cooling device 5, the amount of the gas-liquid two-phase refrigerant delivered through the second outlet branch of the condenser 2 can be adjusted by adjusting the opening of the first throttle valve 8a, so as to adjust the amount of the liquid-phase refrigerant used for the cooling system. In short, the first throttle valve 8a is configured to adjust the refrigerant required by the cooling system according to actual needs.

[0093] like Figure 1The flash evaporator 6 shown is used to separate the gas-liquid two-phase refrigerant from the second outlet branch of the condenser 2 into a gas-phase refrigerant and a liquid-phase refrigerant. The flash evaporator 6 has a first gas-phase outlet and a second liquid-phase outlet. The first gas-phase outlet of the flash evaporator 6 is connected between the first compressor 1a and the second high-pressure compressor 1b, that is, between the inlet of the second high-pressure compressor 1b. Thus, the separated gas-phase refrigerant (i.e., saturated steam) can be supplied to the inlet of the second high-pressure compressor 1b through the first gas-phase outlet of the flash evaporator 6 to be used as intermediate gas supplement. Thus, the pressurized superheated saturated steam from the first compressor 1a is mixed with the gas-phase refrigerant (saturated steam) from the flash evaporator 6 and enters the high-pressure compressor 1b, reducing the system pressure ratio, thereby reducing the compressor energy consumption and making the device more energy-efficient.

[0094] The fifth three-way valve 7e may be connected between the second liquid phase outlet of the flash evaporator 6 and the first control valve 11a and between the second liquid phase outlet of the flash evaporator 6 and the first inlet of the ejector 3. In other words, the fifth three-way valve 7e may be configured to selectively connect the second liquid phase outlet of the flash evaporator 6 and the first control valve 11a or connect the second liquid phase outlet of the flash evaporator 6 and the first inlet of the ejector 3. Specifically, the fifth three-way valve 7e may be configured to connect to the first control valve 11a in the refrigeration mode to provide a supplementary liquid phase refrigerant, or to connect to the first inlet of the ejector 3 in the cold storage mode to provide a liquid phase refrigerant for injection. Since the saturated vapor is separated, the specific enthalpy of the liquid phase refrigerant output from the second liquid phase outlet of the flash evaporator 6 and entering the subsequent circulation loop is reduced, thereby increasing the refrigeration capacity per unit mass.

[0095] The injection liquid refrigerant from the first inlet of the ejector 3 is expanded by the working nozzle of the ejector 3 into low-pressure, high-speed, wet steam with low dryness, and is fully mixed with the saturated steam from the second inlet of the ejector 3 in the mixing chamber of the ejector, and then enters the diffusion chamber to be decelerated and pressurized to obtain decelerated and pressurized steam, and then is transported from the outlet of the ejector 3 to the cold storage device 4 via the second three-way valve 7b.

[0096] In addition to selectively enabling one of the cool storage mode, the cool release mode and the refrigeration mode, the present disclosure also brings other advantages through the combined use of related devices.

[0097] In the cold storage mode, the ejector 3, the cold storage device 4 and the liquid cooling device 5 are connected in series. Specifically, after the gas phase refrigerant from the liquid cooling device 5 is decelerated and pressurized by the ejector 3, it flows through the second three-way valve 7b connecting the outlet of the ejector 3 and the inlet of the cold storage device 4 to enter the cold storage device 4, and performs heat exchange with the refrigerant in the cold storage device to form superheated saturated steam, and the refrigerant stores cold energy. The superheated saturated steam output from the cold storage device 4 flows through the first control valve and is supplied to the inlet of the first compressor 1a. Therefore, since the superheated saturated steam supplied to the inlet of the first compressor 1a does not contain liquid phase refrigerant, the compressor inlet is prevented from sucking liquid. At the same time, the cold storage device uses the refrigerant to store excess cold energy of the system for cooling when the system fails or shuts down. In short, in the cold storage mode, the cold storage device has the dual functions of preventing the compressor inlet from sucking liquid and storing cold energy.

[0098] In the cooling mode, the series connection between the cold storage device 4 and the liquid cooling device 5 (described in detail later) can utilize the cold stored in the coolant in the cold storage device 4 to ensure that the liquid cooling device 5 can supply cold energy even in a short time after a cooling system failure or shutdown.

[0099] The condenser 2 is used as a two-stage compressor inter-structure of a two-stage compressor including a first compressor 1a and a second high-pressure stage compressor 1b, which helps to increase the suction pressure of the compressor and save the power consumption of the compression process.

[0100] The arrangement of the regenerator 10 can make full use of the heat energy and cold energy in the cooling system. Specifically, in the cooling mode, the liquid-phase refrigerant with reduced specific enthalpy from the second liquid-phase outlet of the flash evaporator 6 can be connected to the first control valve 11a by the fifth three-way valve 7e and merged into the gas-liquid refrigerant from the first outlet branch of the condenser 2 as a supplementary liquid-phase refrigerant, thereby obtaining a mixed refrigerant with increased cooling capacity. The mixed refrigerant can be heat-exchanged with the gas-phase refrigerant from the second port of the heat exchanger 52 in the regenerator 10, and form a liquid-phase refrigerant with increased cooling capacity and saturated steam, respectively.

[0101] The arrangement of the ejector 3 helps to increase the suction pressure of the compressor, save the power consumed in the compression process, reduce throttling losses, and ensure the reliability of the system.

[0102] The combined use of a condenser with a regenerator and an ejector, that is, providing a regenerator in the first outlet branch of the condenser and providing an ejector in the second outlet branch of the condenser, can reduce thermodynamic losses during isenthalpic expansion.

[0103] The first control valve 11a is disposed upstream of the first inlet of the regenerator 10 to selectively activate one of the cold storage mode, the cooling mode and the cooling release mode. Specifically, the first control valve 11a is opened when the cold storage mode and the cooling mode are activated and is closed when the cooling release mode is activated.

[0104] Since the first end of the second control valve 11b is connected to the inlet of the first compressor 1a, and the second end of the second control valve 11b can be connected to the outlet of the cold storage device 4 and the fourth three-way valve 7d respectively, the second control valve 11b needs to be opened or closed when switching the cooling mode. Specifically, the second control valve 11b is opened when the cold storage mode and the cooling mode are enabled, and is closed when the cooling mode is enabled.

[0105] Since the third three-way valve 7c is arranged between the second outlet of the regenerator 10 and the second inlet of the ejector 3 and between the second outlet of the regenerator 10 and the fourth three-way valve 7d, the selective communication of the third three-way valve 7c allows the cooling system to switch between the cold storage mode and the refrigeration mode.

[0106] Reference below Figure 2 To describe the working condition of the cooling system according to the present disclosure in the cold storage mode.

[0107] When the fourth three-way valve 7d is closed and the first control valve 11a and the second control valve 11b are opened, the cold storage mode is enabled by selectively connecting the flow paths of the first three-way valve 7a, the third three-way valve 7c, the second three-way valve 7b, and the fifth three-way valve 7e. In the cold storage mode, the fourth three-way valve 5d and the pump 9 are disabled.

[0108] When the cold storage mode is enabled, by opening the first control valve 11a and the second control valve 11b and selectively connecting the flow paths of the first three-way valve 7a, the third three-way valve 7c, the second three-way valve 7b and the fifth three-way valve 7e, at least the second port of the heat exchanger 52, the first three-way valve 7a, the regenerator 10, the third three-way valve 7c, the ejector 3, the second three-way valve 7b, the second control valve 11b and the inlet of the cold storage device 5 and the first compressor 1a are connected in series in sequence, thereby connecting the cold storage circulation loop.

[0109] Specifically, the gas phase refrigerant (superheated saturated steam) from the circulation loop enters the first compressor 1a from the inlet of the first compressor 1a for compression and pressure increase, and leaves the outlet of the first compressor 1a in the form of pressurized superheated saturated steam. The pressurized superheated saturated steam merges with the saturated steam used as intermediate gas supplement from the first gas phase outlet of the flash evaporator 6 and enters the second high-pressure stage compressor 1b for compression to become a high-pressure superheated refrigerant. Then, the high-pressure superheated refrigerant enters the condenser 2 for heat exchange and leaves the outlet of the condenser in the form of a gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is divided into a first part of the gas-liquid two-phase refrigerant flowing into the first outlet branch and a second part of the gas-liquid two-phase refrigerant flowing into the second outlet branch at the outlet of the condenser.

[0110] The first part of the gas-liquid two-phase refrigerant from the first outlet branch of the condenser 2 flows through the first control valve 11a and enters the refrigerant 10 through the first inlet of the refrigerant 10. In the refrigerant 10, the gas-liquid two-phase refrigerant from the first control valve 11a exchanges heat with the gas-phase refrigerant from the second port of the heat exchanger 52 and becomes a liquid-phase refrigerant with increased cooling capacity and saturated steam respectively. The liquid-phase refrigerant with increased cooling capacity then flows through the second throttle valve 8b and enters the heat exchanger through the first port of the heat exchanger 52 to absorb heat and cool the server 53, and then leaves from the second port of the heat exchanger 52 in the form of a gas-phase refrigerant. Then, the gas-phase refrigerant flows through the first three-way valve 7a and enters the refrigerant from the second inlet of the refrigerant 10 to exchange heat with the gas-liquid two-phase refrigerant from the first control valve 11a, and then leaves from the second outlet of the refrigerant 10 in the form of a saturated steam. Next, the saturated steam flows through the third three-way valve 7 c and is supplied to the second inlet of the ejector 3 .

[0111] The second part of the gas-liquid two-phase refrigerant from the second outlet branch of the condenser 2 flows through the first throttle valve 8a and enters the inlet of the flash evaporator 6. The gas-phase refrigerant (i.e., saturated steam) separated by the flash evaporator 6 is supplied to the inlet of the second high-pressure stage compressor 1b as intermediate supplementary gas through the first gas-phase outlet of the flash evaporator 6. The liquid-phase refrigerant separated by the flash evaporator 6 flows from the second liquid-phase outlet of the flash evaporator 6 through the fifth three-way valve 7e and enters the ejector 3 through the first inlet of the ejector 3 to provide the liquid-phase refrigerant for injection.

[0112] In the ejector 3, the liquid phase refrigerant for injection is expanded into low-pressure and high-speed wet steam by the working nozzle of the ejector 3. The wet steam is fully mixed with the saturated steam introduced from the second inlet of the ejector 3 in the mixing chamber of the ejector 3, and then enters the expansion chamber for deceleration and pressurization to obtain decelerated and pressurized steam. The decelerated and pressurized steam flows through the second three-way valve 7b and enters the cold storage device 4 through the inlet of the cold storage device 4. In the cold storage device 4, the decelerated and pressurized steam exchanges heat with the phase-change refrigerant and leaves the outlet of the cold storage device 4 as superheated saturated steam, while the phase-change refrigerant in the cold storage device realizes cold storage. The superheated saturated steam from the outlet of the cold storage device 4 flows through the second control valve 11b and is supplied to the inlet of the first compressor 1a, thereby forming a cold storage circulation loop in the cold storage mode.

[0113] Figure 3 The cold storage circulation loop of the cooling system in the cold storage mode according to the present disclosure is described in the form of a pressure-enthalpy diagram. The direction of the arrow indicates the flow direction of the refrigerant. The specific description is as follows: Superheated saturated steam ( Figure 3 point a) is compressed by the first compressor 1a and becomes superheated saturated steam ( Figure 3 Point b in the figure), and the gas phase refrigerant from the flash evaporator 6 ( Figure 3 point c') to form a mixed refrigerant ( Figure 3 point c) and enters the second high-pressure compressor 1b, where it is compressed and becomes a high-pressure superheated refrigerant ( Figure 3 point d), and then enters condenser 2 and becomes a gas-liquid two-phase refrigerant ( Figure 3 point e in the figure), and becomes a throttled gas-liquid two-phase refrigerant through the first throttle valve 8a ( Figure 3 point f in the figure), enters the flash evaporator 6 and separates the gas phase refrigerant ( Figure 3 Point c' in the middle) and liquid refrigerant ( Figure 3 point g in the middle), where the gas phase refrigerant ( Figure 3 Point c' in the above-mentioned superheated saturated steam ( Figure 3 point b) in the middle to form a mixed refrigerant ( Figure 3 Point c in the figure), while the liquid refrigerant ( Figure 3 point g) enters ejector 3 and expands into low-pressure and high-speed wet steam ( Figure 3 point k in the figure) and enters the mixing chamber of the ejector 3. The first part of the gas-liquid two-phase refrigerant ( Figure 3 point e) flows through the first control valve 11a into the regenerator 10 for heat exchange and becomes a liquid refrigerant with increased cooling capacity ( Figure 3 point e' in the figure), flows through the second throttle valve 8b and becomes a liquid-phase refrigerant with increased cooling capacity after throttling ( Figure 3point h in the figure), and then flows through the heat exchanger 52 to absorb heat and cool to become a gas-phase refrigerant ( Figure 3 point i in the figure), and continues to flow through the regenerator 10 for heat exchange to form hot saturated steam ( Figure 3 point i' in the figure), and then enters the ejection zone of the ejector 3 to form ejected hot saturated steam ( Figure 3 point j in the figure), and then enters the mixing chamber of the ejector 3 to mix with the wet steam ( Figure 3 point k) to form a mixture ( Figure 3 point l in the figure), and then decelerates and pressurizes in the diffuser chamber to form a decelerated and pressurized refrigerant ( Figure 3 point m in the figure), and then enters the cold storage device 4 for heat exchange and becomes superheated saturated steam ( Figure 3 point a in the figure), and then supplied to the first compressor 1a, thus forming a cold storage circulation loop.

[0114] Reference below Figure 4 To describe the working condition of the cooling system according to the present disclosure in the cooling mode.

[0115] The cooling mode is enabled by selectively connecting the flow paths of the first, third, fourth and fifth three-way valves 7a, 7c, 7d and 7e with the first and second control valves 11a and 11b open. In the cooling mode, the ejector 3, the cold storage device 4 and the pump 9 are all disabled.

[0116] When the refrigeration mode is enabled, the first control valve 11a and the second control valve 11b are opened and the flow paths of the first three-way valve 7a, the third three-way valve 7c, the fourth three-way valve 7d and the fifth three-way valve 7e are selectively connected, and at least the second port of the heat exchanger 52, the first three-way valve 7a, the heat regenerator 10, the third three-way valve 7c, the fourth three-way valve 7d, the second control valve 11b and the inlet of the first compressor 1a are connected in series in sequence, thereby connecting the refrigeration cycle circuit.

[0117] Specifically, the superheated saturated steam from the circulation loop enters the first compressor 1a from the inlet of the first compressor 1a for compression and pressure increase, and leaves the outlet of the first compressor 1a in the form of pressurized superheated saturated steam. The pressurized superheated saturated steam merges with the saturated steam used as intermediate gas supplement from the first gas phase outlet of the flash evaporator 6 and enters the second high-pressure stage compressor 1b for compression to form a high-pressure superheated refrigerant. Then, the high-pressure superheated refrigerant leaving the outlet of the second high-pressure stage compressor 1b enters the condenser 2 for heat exchange and leaves the outlet of the condenser in the form of a gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is divided into a first part of the gas-liquid two-phase refrigerant flowing into the first outlet branch and a second part of the gas-liquid two-phase refrigerant flowing into the second outlet branch at the outlet of the condenser.

[0118] The second part of the gas-liquid two-phase refrigerant from the second outlet branch of the condenser 2 flows through the first throttle valve 8a and enters the inlet of the flash evaporator 6. The gas-phase refrigerant (i.e., saturated steam) separated by the flash evaporator 6 is supplied to the inlet of the second high-pressure stage compressor 1b through the first gas-phase outlet of the flash evaporator 6 as intermediate supplementary gas. The liquid-phase refrigerant separated by the flash evaporator 6 flows from the second liquid-phase outlet of the flash evaporator 6 through the fifth three-way valve 7e and merges with the first part of the gas-liquid two-phase refrigerant from the first outlet branch of the condenser 2 to form a mixed refrigerant. The mixed refrigerant flows through the first control valve 11a and enters the regenerator 10 through the first inlet of the regenerator 10. In the regenerator 10, the gas-liquid two-phase refrigerant from the first control valve 11a exchanges heat with the gas-phase refrigerant from the second port of the heat exchanger 52 and becomes a liquid-phase refrigerant with increased cooling capacity and saturated steam respectively. The liquid-phase refrigerant with increased cooling capacity then flows through the second throttle valve 8b and enters the heat exchanger through the first port of the heat exchanger 52 to absorb heat and cool the server 53, and then leaves the heat exchanger 52 from the second port in the form of a gas-phase refrigerant. Then, the gas-phase refrigerant flows through the first three-way valve 7a and enters the regenerator from the second inlet of the regenerator 10 to exchange heat with the gas-liquid two-phase refrigerant from the first control valve 11a, and then leaves the regenerator 10 from the second outlet in the form of saturated steam. Then, the saturated steam flows through the third three-way valve 7c, the fourth three-way valve 7d and the second control valve 11b and is supplied to the inlet of the first compressor 1a, thereby forming a refrigeration cycle in the refrigeration mode.

[0119] Figure 5 The refrigeration cycle of the cooling system according to the present disclosure in the refrigeration mode is described in the form of a pressure-enthalpy diagram. The direction of the arrow indicates the flow direction of the refrigerant. The specific description is as follows: superheated saturated steam ( Figure 5 point a) is compressed by the first compressor 1a and becomes superheated saturated steam ( Figure 5 Point b in the figure), and the gas phase refrigerant from flash steam 6 ( Figure 5 point c') to form a mixed refrigerant ( Figure 5 point c) and enters the second high-pressure compressor 1b, where it is compressed and becomes a high-pressure superheated refrigerant ( Figure 5 point d), and then enters condenser 2 and becomes a gas-liquid two-phase refrigerant ( Figure 5 Point e in the middle), the second part of the gas-liquid two-phase refrigerant ( Figure 5 point e) through the first throttle valve 8a to become a throttled gas-liquid two-phase refrigerant ( Figure 5 point f in the figure), enters the flash evaporator 6 and separates the gas phase refrigerant ( Figure 5 Point c' in the middle) and liquid refrigerant ( Figure 5 point g in the middle), gas phase refrigerant ( Figure 5Point c' in the above-mentioned superheated saturated steam ( Figure 5 point b) in the middle to form a mixed refrigerant ( Figure 5 Point c in the figure), while the liquid refrigerant ( Figure 5 point g) into the first part of the gas-liquid two-phase refrigerant ( Figure 5 point e) enters the regenerator 10 for heat exchange to form a liquid refrigerant with increased cooling capacity ( Figure 5 point e' in the figure), flows through the second throttle valve 8b and becomes a liquid-phase refrigerant with increased cooling capacity after throttling ( Figure 5 point h in the figure), and then flows through the heat exchanger 52 to absorb heat and cool to become a gas-phase refrigerant ( Figure 5 point i in the figure), then flows through the regenerator 10 for heat exchange to form hot saturated steam, then flows through the third three-way valve 7c, the fourth three-way valve 7d and the second control valve 11b to form superheated saturated steam ( Figure 5 The gas is supplied to the first compressor 1a in the form of point a) in FIG. 1 , thus forming a refrigeration cycle.

[0120] Reference below Figure 6 To describe the working condition of the cooling system according to the present disclosure in the cooling mode.

[0121] When the first control valve 11a and the second control valve 11b are closed, the cooling mode is enabled by selectively connecting the flow paths of the first three-way valve 7a, the second three-way valve 7c and the fourth three-way valve 7d. The cooling mode is operated when a refrigeration system fails or shuts down. In the cooling mode, the pump 9 is turned on, while the first compressor 1a, the second high-pressure stage compressor 1b, the condenser 2, the ejector 3, the flash tank 6 and the regenerator 10 are all disabled.

[0122] When the cooling mode is enabled, the first control valve 11a and the second control valve 11b are closed and the flow paths of the first three-way valve 7a, the second three-way valve 7b and the fourth three-way valve 7d are selectively connected, and at least the first port of the heat exchanger 52, the second three-way valve 7b, the cold storage device 4, the fourth three-way valve 7d, the pump 9, the first three-way valve 7a and the second port of the heat exchanger 52 are connected in series in sequence, thereby connecting the cooling circulation loop.

[0123] In the cooling mode, the pump 9 is used as a power device in the cooling mode. The gas-phase refrigerant flowing through the heat exchange tube of the cold storage device 4 exchanges heat with the phase-change cold storage agent and becomes a liquid-phase refrigerant, then flows out from the outlet of the cold storage device 4, flows through the fourth three-way valve 7d, the pump 9 and the first three-way valve 7a and the second port of the heat exchanger 52, enters the heat exchanger 52 for heat exchange and becomes a gas-phase refrigerant, and returns to the cold storage device 4 through the second three-way valve 7b and the inlet of the cold storage device 4, thereby forming a cooling circulation loop. The liquid-phase refrigerant in the heat exchanger 52 provides sufficient cooling to the server 53 by absorbing heat and cooling. The cooling capacity in the cold storage device 4 is used to ensure that the liquid cooling device 5 can be supplied with cooling capacity even in a short period of time after a cooling system failure or shutdown.

[0124] The present disclosure also relates to a control method for controlling a cooling system according to the present disclosure, the control method comprising: enabling one of a cold storage mode, a cooling mode and a refrigeration mode by selectively controlling a corresponding valve among a plurality of valves. Specifically, selectively controlling a corresponding valve among a plurality of valves comprises: selectively opening and closing a first control valve and a second control valve and selectively connecting a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve and a fifth three-way valve. In addition, selectively controlling a corresponding valve among a plurality of valves comprises: opening the first control valve and the second control valve when the cold storage mode and the refrigeration mode are enabled and closing the first control valve and the second control valve when the cooling mode is enabled. In addition, the selective connection of the third three-way valve allows the cooling system to switch between the refrigeration mode and the cold storage mode. Thus, one of the cold storage mode, the cooling mode and the refrigeration mode is enabled in a simple manner.

[0125] The control method includes enabling the cold storage mode by executing the following steps: opening the first control valve and the second control valve and closing the fourth three-way valve; connecting the first three-way valve to the second port of the heat exchanger and the second inlet of the regenerator; connecting the third three-way valve to the second outlet of the regenerator and the second inlet of the ejector; connecting the second three-way valve to the outlet of the ejector and the inlet of the cold storage device; and connecting the fifth three-way valve to the second liquid phase outlet of the flash evaporator and the first inlet of the emitter. Thus, enabling the cold storage mode is achieved in a simple manner.

[0126] The control method includes enabling the cooling mode by executing the following steps: opening the first control valve and the second control valve; connecting the first three-way valve to the second port of the heat exchanger and the second inlet of the regenerator; connecting the third three-way valve to the second outlet of the regenerator and the fourth three-way valve; connecting the fourth three-way valve to the third three-way valve and the second control valve; and connecting the fifth three-way valve to the second liquid phase outlet of the flash evaporator and the first control valve. Thus, enabling the cooling mode is achieved in a simple manner.

[0127] The control method includes enabling the cooling mode by executing the following steps: closing the first control valve and the second control valve and starting the pump; connecting the second three-way valve to the first port of the heat exchanger and the inlet of the cold storage device; connecting the fourth three-way valve to the outlet of the cold storage device and the first three-way valve; and connecting the first three-way valve to the fourth three-way valve and the second port of the heat exchanger. Thus, enabling the cooling mode is achieved in a simple manner.

[0128] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein 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, and they should all be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A cooling system for a liquid-cooled data center, wherein: The cooling system includes at least two compressors, a condenser, a flash evaporator, an ejector, a cold storage device, a heat regenerator, a liquid cooling device and a plurality of valves connected by pipelines to form a circulation loop, the liquid cooling device includes at least a heat exchanger and a server to be cooled, the plurality of valves include at least a plurality of three-way valves, a first control valve and a second control valve arranged in corresponding parts of the circulation loop, and the cooling system is configured to selectively open and close the first control valve and the second control valve according to the cooling demand of the data center and to adjust the connecting flow path of the corresponding three-way valve to enable one of the cold storage mode, the cooling mode and the cooling mode.

2. The cooling system according to claim 1, wherein: The at least two compressors include a first compressor and a second high pressure stage compressor connected in series.

3. The cooling system according to claim 2, wherein: The outlet of the second high-pressure stage compressor is connected to the inlet of the condenser, the second outlet branch branching from the condenser is connected to the inlet of the flash evaporator, and the first gas phase outlet of the flash evaporator is connected to the inlet of the second high-pressure stage compressor to supply the separated gas phase refrigerant as intermediate make-up gas to the second high-pressure stage compressor.

4. The cooling system according to claim 5, wherein: A first throttle valve is disposed in the second outlet branch and upstream of the inlet of the flash vessel.

5. The cooling system according to claim 3, wherein: The regenerator is arranged in a first outlet branch branching from an outlet of the condenser and is connected in series with the heat exchanger, and the regenerator is constructed to exchange heat between the gas-liquid two-phase refrigerant from the first outlet branch and the gas-phase refrigerant from the second port of the heat exchanger to obtain liquid-phase refrigerant with increased cooling capacity that leaves the first outlet of the regenerator and is supplied to the heat exchanger, and saturated steam that leaves the second opening of the regenerator.

6. The cooling system according to claim 5, wherein: The first control valve is disposed in the first outlet branch and upstream of the first inlet of the regenerator, and the first control valve is configured to be opened when the cold storage mode and the cooling mode are enabled and to be closed in the cooling release mode.

7. The cooling system according to claim 6, wherein: The second liquid phase outlet of the flasher is configured to be connected to the first control valve in the cooling mode and to be connected to the first inlet of the ejector in the cold storage mode.

8. The cooling system according to claim 7, wherein: The ejector also has a second inlet, a working nozzle, a mixing chamber, a diffusion chamber and an outlet. The second outlet of the regenerator is connected to the second inlet of the ejector, and the outlet of the ejector is connected to the inlet of the cold storage device.

9. The cooling system according to any one of claims 2 to 8, wherein: The plurality of three-way valves include a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve and a fifth three-way valve; The first three-way valve is configured to selectively connect the second port of the heat exchanger to the second inlet of the regenerator or connect the second port of the heat exchanger to the fourth three-way valve; The second three-way valve is configured to selectively connect the outlet of the ejector and the inlet of the cold storage device or connect the first port of the heat exchanger and the inlet of the cold storage device; The third three-way valve is configured to selectively connect the second outlet of the regenerator and the second inlet of the ejector or connect the second outlet of the regenerator and the fourth three-way valve; The fourth three-way valve is configured to selectively connect the outlet of the cold storage device to the first three-way valve or to connect the third three-way valve and the second control valve; as well as The fifth three-way valve may be configured to selectively connect the second outlet of the flasher with the first control valve or connect the second outlet of the flasher with the first inlet of the ejector.

10. The cooling system according to claim 9, wherein: The cooling system is configured to connect in series at least the second port of the heat exchanger, the first three-way valve, the regenerator, the third three-way valve, the ejector, the second three-way valve, the cold storage device, the second control valve and the inlet of the first compressor in sequence when the cold storage mode is enabled, thereby connecting the cold storage circulation loop.

11. The cooling system according to claim 9, wherein: The cooling system is configured to connect at least the second port of the heat exchanger, the first three-way valve, the heat regenerator, the third three-way valve, the fourth three-way valve, the second control valve and the inlet of the first compressor in series in sequence when the cooling mode is enabled, thereby connecting the refrigeration cycle circuit.

12. The cooling system according to claim 9, wherein: The cooling system is configured to connect at least the first port of the heat exchanger, the second three-way valve, the cold storage device, the fourth three-way valve, the pump and the first three-way valve and the second port of the heat exchanger in series in sequence when the cooling mode is enabled, by closing the first control valve and the second control valve and selectively connecting the flow paths of the first three-way valve, the second three-way valve and the fourth three-way valve, thereby connecting the cooling circulation loop.

13. The cooling system according to claim 10, wherein: The second liquid phase outlet of the flash evaporator is connected to the first inlet of the ejector by means of the fifth three-way valve in the cold storage mode to provide liquid phase refrigerant for injection.

14. The cooling system according to claim 13, wherein: The outlet of the ejector is connected in series to the inlet of the cold storage device through a second three-way valve.

15. The cooling system according to claim 11, wherein: The second liquid phase outlet of the flash evaporator is connected to the first control valve by means of the fifth three-way valve in the refrigeration mode to provide supplementary liquid phase refrigerant.

16. The cooling system according to claim 12, wherein: The pump is arranged between the fourth three-way valve and the first three-way valve so as to provide power for driving the circulation of the refrigerant in the cooling mode.

17. The cooling system according to any one of claims 1 to 16, wherein: The second throttle valve is disposed between the first outlet of the regenerator and the first port of the heat exchanger.

18. The cooling system according to any one of claims 1 to 17, wherein: The cold storage device comprises a heat exchange tube encapsulated in a shell and a phase-change cold storage agent, wherein the phase-change cold storage agent is filled around the heat exchange tube.

19. The cooling system according to claim 18, wherein: The cold storage device includes a capacity monitor arranged in the shell. When the capacity monitor detects that the capacity of the cold storage device reaches 95%, the cooling system switches from the cold storage mode to the refrigeration mode.

20. The cooling system according to any one of claims 1 to 19, wherein: The temperature and pressure sensors are disposed adjacent to the heat exchanger and on a chassis encapsulating the heat exchanger and the server.

21. The cooling system according to any one of claims 1 to 19, wherein: Selective communication of the third three-way valve allows the cooling system to switch between a cold storage mode and a refrigeration mode.

22. A control method for controlling the cooling system according to claim 9, the control method comprising the following steps: The first control valve and the second control valve are selectively opened and closed, and the first three-way valve, the second three-way valve, the third three-way valve, the fourth three-way valve, and the fifth three-way valve are selectively connected.

23. The control method according to claim 22, wherein: Selectively controlling corresponding valves of the plurality of valves includes opening the first control valve and the second control valve when the cold storage mode and the cooling mode are enabled, and closing the first control valve and the second control valve when the cooling release mode is enabled.

24. The cooling system of claim 23, wherein: Selective communication of the third three-way valve allows the cooling system to switch between a cooling mode and a cold storage mode.

25. The control method of the cooling system according to any one of claims 22 to 24, the control method comprising enabling the cold storage mode by executing the following steps: Open the first control valve and the second control valve and close the fourth three-way valve; Connecting the first three-way valve to the second port of the heat exchanger and the second inlet of the regenerator; Connecting the third three-way valve to the second outlet of the regenerator and the second inlet of the ejector; Connecting the outlet of the ejector and the inlet of the cold storage device to the second three-way valve; and The fifth three-way valve is connected between the second liquid phase outlet of the flash evaporator and the first inlet of the emitter.

26. The control method of the cooling system according to any one of claims 22 to 24, the control method comprising enabling the cooling mode by executing the following steps: Open the first control valve and the second control valve; Connecting the first three-way valve to the second port of the heat exchanger and the second inlet of the regenerator; Connect the third three-way valve to the second outlet of the regenerator and the fourth three-way valve; Make the fourth three-way valve communicate with the third three-way valve and the second control valve; and The fifth three-way valve is connected to the second liquid phase outlet of the flash evaporator and the first control valve.

27. The control method of the cooling system according to any one of claims 22 to 24, the control method comprising enabling the cooling mode by executing the following steps: closing the first control valve and the second control valve and starting the pump; Connecting the second three-way valve to the first port of the heat exchanger and the inlet of the cold storage device; connecting the outlet of the cold storage device and the first three-way valve to the fourth three-way valve; and The first three-way valve is connected to the fourth three-way valve and the second port of the heat exchanger.

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