CN117654222A

CN117654222A - Two-phase immersion cooling system, working fluid recovery device and method

Info

Publication number: CN117654222A
Application number: CN202310296560.5A
Authority: CN
Inventors: 林威志; 张仁俊
Original assignee: Delta Electronics Inc
Current assignee: Delta Electronics Inc
Priority date: 2022-09-06
Filing date: 2023-03-24
Publication date: 2024-03-08
Also published as: TWI828565B

Abstract

The present disclosure provides a working fluid recovery device for a two-phase immersion cooling system, including a gas mover, a water trap, a working fluid recovery device, a condenser, and a working fluid collection tank, and a working fluid recovery method for the working fluid recovery device. The gas mover is configured to draw in a mixed gas comprising a non-condensable gas, a water gas, and a vapor phase of a working fluid. The water remover is connected with the gas shifter and is used for removing water and gas. The working fluid recoverer is connected with the dehydrator and used for recovering the working fluid vapor phase and discharging non-condensable gas. The condenser is connected with the working fluid recoverer and is used for condensing the working fluid vapor phase back to the working fluid liquid phase. The working fluid collection tank is connected with the condenser and is used for storing the working fluid liquid phase.

Description

Two-phase immersion cooling system, working fluid recovery device and method

Technical Field

The present disclosure relates to a two-phase immersion cooling system, a working fluid recovery device, and a working fluid recovery method for the working fluid recovery device.

Background

Large computer server systems can perform a large amount of workload and generate a large amount of heat during their operation. Most of the heat is generated by the operation of the server systems. Due in part to the large amount of heat generated, these servers are typically rack-mounted and air cooled by internal fans and/or fans attached to the back of the rack or elsewhere in the server ecosystem. As the demand for access to more and more processing and storage resources continues to expand, the density of server systems (i.e., the processing power and/or storage placed on a single server, the number of servers placed in a single rack, and/or the number of servers and/or racks deployed in a single server farm) continues to increase. With the increased processing or storage density desired in these server systems, the resulting thermal challenges remain a significant impediment. The existing heat dissipation technology adopts fans, water-cooling plate type cooling, single-phase immersed cooling and two-phase immersed cooling as main solutions.

For the fan heat dissipation mode, the efficiency of the fan heat dissipation mode for a high-power single machine is too low, equipment operation high temperature is easy to cause, and the fan heat dissipation is easy to be influenced by the outside environment temperature, for example, the temperature in winter is low, the fan heat dissipation can also meet the requirement, the temperature in summer is high, the fan heat dissipation effect is limited, and the heat dissipation requirement of the computing equipment cannot be met. The main medium of the water cooling plate type heat dissipation mode is water, the heat dissipation efficiency is higher than that of a fan, but the risk of long-time use of rust and water condensation of the water cooling plate or leakage and short circuit of a runner exists, and the water cooling plate is required to be independently designed for different heat dissipation devices, so that the economy is not high.

Therefore, an immersed cooling mode is mainly adopted at present, in the immersed cooling mode, in the single-phase immersed mode, the immersed cooling mode is mainly divided into an overflow type and a down-spray type, cold flow enters from the bottom of a heating component in the overflow type, heat is lifted along with liquid, and the hottest liquid at the top is pumped into a refrigerator for external heat dissipation. This approach is more efficient for dense heat sinks, but compared to consuming liquid, requires the heat sink assembly to be fully submerged in the cooling liquid. And the cold flow is precisely sprayed to the bottom radiating device from the upper part in a downward spraying type radiating mode, and after heat exchange, the heat flow is pumped into a recovery tank along with gravity to radiate. This approach can save coolant, but is not efficient for heat dissipation of high density heat dissipating devices.

For two-phase immersed cooling, the cost of the cooling liquid is high, and the requirement on the sealing performance of equipment is extremely high due to gas-liquid conversion, for example, the sealing performance is poor, the environmental protection performance is poor, and the economy of the whole system is also low due to liquid leakage caused by gas escape. In view of this, how to solve the dissipation and recovery of the coolant gas state has become one of the important research and development problems at present.

Disclosure of Invention

The present disclosure provides a working fluid recovery apparatus for a two-phase immersion cooling system, comprising a gas mover, a water trap, a working fluid recovery, a first condenser, and a working fluid collection tank. The gas mover is configured to draw in a mixed gas comprising a non-condensable gas, a water gas, and a vapor phase of a working fluid. The water remover is connected with the gas shifter and is used for removing water and gas. The working fluid recoverer is connected with the dehydrator and used for recovering the working fluid vapor phase and discharging non-condensable gas. The first condenser is connected with the working fluid recoverer and is used for condensing the working fluid vapor phase back to the working fluid liquid phase. The working fluid collection tank is connected with the first condenser and is used for storing a working fluid liquid phase.

The present disclosure further provides a two-phase submerged cooling system comprising a cooling tank, an upper cover, a closed housing, and a working fluid recovery device as described above. The cooling tank is used for containing the working fluid, the heating component and the second condenser, wherein when the liquid phase of the working fluid receives heat of the heating component, the phase is converted into vapor phase, and the vapor phase is condensed back into the liquid phase through the second condenser. The upper cover is arranged at the top of the cooling tank. The closed shell is arranged above the cooling groove, wherein when the upper cover is opened, the cooling groove is communicated with the closed shell, and part of working fluid vapor phase escapes into the closed shell. The working fluid recovery device is arranged outside the cooling tank and the airtight shell, is communicated with the cooling tank and the airtight shell, and is used for recovering part of working fluid vapor phase dissipated into the airtight shell.

The present disclosure further provides a working fluid recovery method for the working fluid recovery apparatus as described above. The method comprises the following steps: feeding a first mixed gas containing non-condensable gas, water gas and a working fluid vapor phase into a dehydrator through a gas mover; adsorbing the water vapor by a dehydrator and delivering a second mixed gas comprising a non-condensable gas and a working fluid vapor phase to a working fluid recoverer; adsorbing the working fluid vapor phase by a working fluid recoverer and discharging non-condensable gas; and condensing the working fluid vapor phase back to the working fluid liquid phase by the condenser and storing in the working fluid collection tank.

The two-phase immersed cooling system, the working fluid recovery device and the working fluid recovery method can respectively realize gas recovery of the cooling tank and the closed shell of the two-phase immersed cooling system. The advantages of the present disclosure are: (1) Recycling and discharging non-condensable gas and water gas from the cooling tank to the outside, so that the circulation efficiency of the working fluid can be improved; (2) Recovering the working fluid vapor phase from the hermetic enclosure reduces the cost of working fluid vapor phase losses and reduces greenhouse gas emissions.

Drawings

The disclosure will be best understood from the following detailed description when read in connection with the accompanying drawings. It should be emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale and are used for illustration purposes only. In fact, the dimensions of the features may be arbitrarily increased or decreased for clarity of discussion.

FIG. 1 illustrates a schematic diagram of a two-phase submerged cooling system according to an embodiment of the present disclosure;

FIG. 2 illustrates a schematic view of a detailed connection between a working fluid recovery device and a cooling tank and containment vessel according to an embodiment of the present disclosure;

fig. 3 shows a flow chart of a method of working fluid recovery according to an embodiment of the present disclosure.

Description of the reference numerals

10 two-phase submerged cooling system

110 cooling tank

111 pressure gauge

112 working fluid

113 liquid level detector

114 heating component

115 water-stop plate

116 condenser

120 upper cover

130 closed shell

131 working fluid sensor

140 working fluid recoverer

141 adsorption unit

143 condenser

144 working fluid collection tank

146 Desorption unit

145,147 electromagnetic valve

148 valve

149 valve

150 gas mover

160 dehydrator

161 adsorption unit

164 desorption unit

165,167 solenoid valve

170 bellows

180 pipeline

181 valve

182 pipeline

183 valve

184 pipeline

185 pipeline

190 cooling tower

192 pipeline

193 sensor

194 pipeline

195 sensor

196 rolling sluice valve

197 check valve

198 two-way valve

20 working fluid recovery device

30 method

32 step

34 step

36 step

38 step(s)

E _G External air

M1 _G First mixed gas

M2 _G Second mixed gas

NC _G Non-condensable gas

S _G Steam-water ratio

W _G Vapor phase

W _L Liquid phase

Detailed Description

The following disclosure provides many different embodiments, or examples, for implementing different features of the disclosure. Specific examples of components and arrangements are described below to simplify the present disclosure.

Two-phase immersion cooling is an emerging cooling technology for the high performance server computing market that relies on heat absorbed during vaporization of a liquid (cooling fluid) into a gas (i.e., heat of vaporization). The working fluid used in this application, i.e. coolant or refrigerant, must meet certain requirements to be viable in this application. For example, the boiling temperature during operation should be in the range between, for example, 30 ℃ to 75 ℃. In general, this range allows the server components to be maintained at a sufficiently cool temperature while allowing the heat to efficiently dissipate to a final heat sink (e.g., outside air). The working fluid must be inert so that it is compatible with the materials of construction and the electrical components. Certain perfluorinated and partially fluorinated materials may meet these requirements.

In a typical two-phase immersion cooling system, the server is immersed in a bath of working fluid (having a boiling temperature), which is sealed and maintained at or near atmospheric pressure. The condenser integrated into the cooling tank is cooled by cooling at a certain temperature (T _w ) And (5) cooling the water below. During operation, after establishing a steady reflux, the working fluid vapor (vapor phase) produced by the boiling working fluid forms discrete vapor levels as it is condensed back into a liquid state. Above this layer is "headspaceA mixture of non-condensable gases (typically air, water vapor) and working fluid vapor, which is between T _w With the temperature (T) of the ambient air outside the cooling tank _amb ) A certain temperature in between. These three components (liquid phase, vapor phase and mixture) occupy the volume within the tank.

During normal operation of a two-phase submerged cooling device, the "headspace" phase must occasionally be vented. Such venting results in loss of working fluid vapor, which is an undesirable operating cost. In addition, since most of the working fluid is fluoride, the vapor phase working fluid discharged to the outside may be regarded as greenhouse gas, not conforming to the specifications of global warming potential (Global warming potential, GWP).

As used herein, "fluid" refers to a liquid and/or vapor phase. As used herein, "fluoro-" (e.g., with respect to a group or moiety, such as in the case of "fluoroalkylene" or "fluoroalkyl" or "fluorocarbon") or "fluorinated" means (i) only partially fluorinated such that there is at least one carbon bonded hydrogen atom, or (ii) perfluorinated. As used herein, "perfluoro (-)" (e.g., with respect to a group or moiety, such as in the case of "perfluoroalkyl" (or "perfluoroalkyl") or "perfluorocarbon") or "perfluorinated (perfluorocarbon)" means fully fluorinated such that any carbon-bonded hydrogen is replaced with a fluorine atom, except where otherwise indicated. As used herein, "halogenated material (halogenated material)" means an organic compound that is at least partially halogenated (up to fully halogenated) such that it contains at least one carbon-bonded halogen atom.

The present disclosure provides a two-phase submerged cooling system that can recover a working fluid vapor phase to reduce maintenance costs of the system, as well as reduce emissions of greenhouse gases (working fluid vapor phase). Fig. 1 shows a schematic configuration of a two-phase immersion cooling system 10 according to an embodiment of the present disclosure. The arrow direction in the figure is the flow direction of the medium (liquid phase or vapor phase).

As shown in fig. 1, the two-phase immersion cooling system 10 includes a cooling tank 110, an upper cover 120, a hermetic case 130, and a working fluid recovery device 20. The cooling tank 110 is configured to hold a working fluid 112, a heat generating component 114, and a condenser 116. In more detail, the working fluid 112 fills the entire cooling tank 110, and the working fluid liquid phase W _L In the lower volume within the cooling tank 110, while the working fluid vapor phase W _G Located in the upper volume within the cooling tank 110. The heat generating component 114 is disposed inside the cooling tank 110 and in the lower volume of the cooling tank 110, and the heat generating component 114 is completely immersed in the working fluid liquid phase W _L Among them. In other embodiments, the heat generating component 114 may be at least partially submerged in the working fluid liquid phase W _L Among them. In some embodiments, the heat generating component 114 may include one or more electronic devices, such as an operation server.

A condenser 116 is disposed inside the cooling tank 110 and is located in the upper volume within the cooling tank 110. The condenser 116 shown in fig. 1 is only illustrative, and in practice, the condenser 116 is, for example, a plurality of bare metal lines filled with running water at normal temperature. During stable operation of the two-phase immersion cooling system 10, the working fluid liquid phase W _L Absorbs heat from the heat generating component 114 and converts it into a working fluid vapor phase W _G And rises to the upper volume of the cooling tank 110; next, the working fluid vapor phase W _G Condenser 116, which contacts low temperatures, condenses back into working fluid liquid phase W _L And falls down to return to the lower volume of the cooling tank 110.

In some embodiments, the cooling tank 110 further comprises a pressure gauge 111 for detecting the working fluid vapor phase W within the cooling tank 110 _G Is a pressure of the pressure sensor. For example, when the pressure in the cooling tank 110 is higher than a certain threshold (threshold), the valve 181 opens and releases a portion of the working fluid vapor phase W _G To maintain the pressure within the cooling tank 110. In some embodiments, a liquid level detector 113 is also provided in the cooling tank 110 for detecting the liquid phase W of the working fluid _L Whether the amount of (2) is sufficient.

In some embodiments, the working fluid 112 may be or include one or more halogenated fluids (e.g., fluorinated or chlorinated). For example, the working fluid 112 may be a fluorinated organic fluid. Suitable fluorinated organic fluids may include hydrofluoroethers, fluoroketones (or perfluoro ketones), perfluorocarbides (e.g., perfluorohexane), perfluoromethylmorpholine, hydrofluoroolefins, or combinations thereof.

In some embodiments, the working fluid 112 may comprise the following (individually or in any combination) based on the total weight of the working fluid: ethers, alkanes, perfluoroolefins, olefins, haloolefins, perfluorocarbides, perfluoroethers, perfluorinated tertiary amines, cycloalkanes, esters, ketones, perfluoroketones, aromatics, oxiranes, siloxanes, hydrochlorocarbons, hydrochlorofluorocarbons, hydrofluoroolefins, hydrofluorocarbides, hydrochloroolefins, hydrochlorofluoroolefins, or mixtures thereof. Such additional components may be selected for particular uses to modify or enhance the properties of the composition.

With continued reference to fig. 1, an upper cover 120 is disposed on top of the cooling tank 110. The hermetic case 130 is disposed above the cooling tank 110. When the upper cover 120 is opened, the cooling tank 110 communicates with the hermetic case 130, and part of the working fluid vapor phase W _G And escapes into the hermetic shell 130. The working fluid recovery device 20 is provided outside the cooling tank 110 and the hermetic case 130, and communicates the cooling tank 110 and the hermetic case 130. In some embodiments, the hermetic housing 130 further comprises a working fluid sensor 131 to detect the working fluid concentration within the hermetic housing 130. For example, when the concentration of the working fluid in the hermetic case 130 is higher than a set threshold, the valve 183 and the working fluid recovery device 20 are opened to recover the working fluid.

It should be noted that during the initial operation of the two-phase immersion cooling system 10, the upper volume of the cooling tank 110 may contain a small amount of non-condensable gas NC due to aeration _G . That is, the upper volume of the cooling tank 110 contains the non-condensing gas NC _G With working-fluid vapour phase W _G Is a mixed gas of (a) and (b). However, non-condensing gas NC _G The presence of (2) can result in a significant decrease in the cooling performance of the condenser 116. Therefore, in the preliminary operation of the two-phase submerged cooling system 10, the non-condensing gas NC must be introduced _G And (5) extracting. However, during the extraction of the non-condensable gasesBody NC _G At the same time, will also result in a partial working fluid vapor phase W _G Is extracted and lost. Accordingly, the working fluid recovery device 20 of the two-phase submerged cooling system 10 of the present disclosure may be utilized to recover the working fluid 112 in the mixed gas withdrawn from the cooling tank 110 and to vent the non-condensable gas NC via the line 184 _G . In more detail, in the preliminary operation, the valve 181 of the pipeline 180 is opened to allow the mixed gas to flow out, and the mixed gas is processed by the working fluid recovery device 20 to recover the working fluid 112 without condensing the gas NC _G Is discharged to the outside environment. Of course, this is to exclude a part of the non-condensable gas NC _G Is present in the cooling tank 110 and thereby increases the cooling performance of the condenser 116.

In some embodiments, a water-stop plate 115 may be disposed in the lower volume of the cooling tank 110 and between the condenser 116 and the heat-generating component 114 for separating the cooling water from the working fluid liquid phase W _L And (5) separating. In more detail, the cooling tank 110 may have moisture S remaining after cleaning _G NC, non-condensable gas _G The condensate obtained during the heat exchange by the condenser 116 will contain water and a working fluid liquid phase W _L . After the condensate returns to the lower volume of the cooling tank 110, the working fluid liquid phase W _L Is greater than the density of water, so that water floats in the working fluid liquid phase W _L Above, and working fluid liquid phase W _L Will flow through the gap under the water barrier 115. In addition, the working fluid recovery device 20 can recover and discharge the moisture S in the cooling tank 110 after cleaning _G To reduce moisture residue.

Notably, after a period of operation of the two-phase submerged cooling system 10, the heat generating components 114 within the cooling bath 110 may have to be serviced or replaced. During repair or replacement of parts, the upper cover 120 is opened to move the heat generating component 114 up to the hermetic shell 130 in an automated or semi-automated manner. When the maintenance or the replacement of the parts is completed, the upper cover 120 is closed, so that the cooling tank 110 is maintained in a closed state. As such, the working fluid vapor phase W within the cooling bath 110 _G Can also be dissipated to the airtight shell in a large amount130, thereby resulting in a loss of working fluid. Accordingly, the working fluid recovery device 20 of the present disclosure may be used to recover the working fluid 112 from the mixed gas of the hermetic case 130. In more detail, after maintenance or replacement of parts, the valve 183 on the line 182 is opened to allow the mixed gas to flow into the working fluid recovery device 20 to recover the working fluid 112. Non-condensable gas NC not adsorbed by the working fluid recovery device 20 _G It is returned to the containment vessel 130 via line 185.

Fig. 2 illustrates a detailed connection relationship between the working fluid recovery device 20 and the cooling tank 110 and the hermetic case 130 according to an embodiment of the present disclosure. As shown in fig. 2, the working fluid recovery apparatus 20 includes a gas mover 150, a water trap 160, a working fluid recovery unit 140, a condenser 143, and a working fluid collection tank 144. Specifically, the gas mover 150 is configured to draw in a non-condensable gas NC _G Water vapor S _G And a working fluid vapor phase W _G Is a first mixed gas M1 of _G . In some embodiments, the gas mover 150 may be a gas compressor, a gas pump, a fan, or the like. The water remover 160 is connected to the gas mover 150 for removing the water S _G . The working fluid recoverer 140 is connected to the water trap 160 for recovering the working fluid vapor phase W _G . The condenser 143 is connected to the working fluid recoverer 140 for heat exchange to make the working fluid vapor phase W _G Condensed back into working fluid liquid phase W _L . The working fluid collection tank 144 is connected to the condenser 143 for storing the working fluid liquid phase W _L . The gas mover 150 communicates with the containment vessel 130 via line 182 and with the cooling bath 110 via line 180.

The water trap 160 includes an adsorption unit 161, a desorption unit 164, and solenoid valves 165, 167. The solenoid valve 165 is used to communicate the gas mover 150 with the adsorption unit 161 during adsorption to introduce the first mixed gas M1 _G . The adsorption unit 161 is connected with the electromagnetic valve 165 for adsorbing the water vapor S during adsorption _G And discharge non-condensable gas NC _G And a working fluid vapor phase W _G To the working fluid retriever 140. The desorption unit 164 is used for introducing the external air E during desorption _G And heat to remove water vapor S _G Is desorbed from the adsorption unit 161. The solenoid valve 167 is connected to the desorption unit 164 for discharging the water vapor S during desorption _G To the outside.

The working fluid recoverer 140 includes an adsorption unit 141, a desorption unit 146, and solenoid valves 145, 147. The adsorption unit 141 is configured to adsorb the working fluid vapor phase W at the time of adsorption _G And discharge non-condensable gas NC _G . The desorption unit 146 is used for introducing non-condensing gas NC during desorption _G And heated to bring the working fluid into the vapor phase W _G Is desorbed from the adsorption unit 141. The solenoid valve 145 is used to communicate the adsorption units 161 and 141 at the time of adsorption. Solenoid valve 147 is used to discharge working fluid vapor phase W during desorption _G To condenser 143.

It will be appreciated that because of the working fluid vapor phase W _G Molecular greater than water vapor S _G The mixed gas pumped by the gas shifter 150 should preferentially absorb smaller water vapor S by the water eliminator 160 _G The molecules are then passed through the working fluid recovery device 140 to adsorb the larger working fluid vapor phase W _G Molecules, thereby from the first mixed gas M1 _G Middle separated water vapor S _G And a working fluid vapor phase W _G . In some embodiments, the adsorption units 161, 141 and the desorption units 164, 146 are respectively a plurality of fibrous adsorption materials. One of ordinary skill in the art can select an appropriate fiber adsorbent according to the size of the gas molecule.

In some embodiments, working fluid recovery device 20 further comprises valve 148 and valve 149. The valve 148 is connected to the working fluid recoverer 140 to control the gas inlet and outlet between the working fluid recoverer 140 and the hermetic housing 130 or to control the gas inlet and outlet between the working fluid recoverer 140 and the outside. Valve 149 is connected to the working fluid collection tank 144 for controlling the working fluid phase W between the working fluid collection tank 144 and the cooling tank 110 _L And the inlet and outlet between.

With respect to the operation of the working fluid recovery device 20, the present disclosure further provides a working fluid recovery method. Fig. 3 shows a flow chart of a method 30 of working fluid recovery, the method 30 of working fluid recovery comprising steps 32, 34, 36 and 38, according to an embodiment of the present disclosure.

In step 32, non-condensable gas NC will be contained by the gas mover 150 _G Water vapor S _G Vapor phase W of working fluid _G Is a first mixed gas M1 of _G Into the water trap 160. In some embodiments, the first mixed gas M1 _G May be from the cooling tank 110 or containment vessel 130 of the two-phase submerged cooling system 10.

In step 34, moisture S is adsorbed by the water trap 160 _G And will contain non-condensable gases NC _G Vapor phase W of working fluid _G Is a second mixed gas M2 of _G And is fed into the working fluid recoverer 140.

In step 36, the working fluid vapor phase W is adsorbed by the working fluid recoverer 140 _G And discharge non-condensable gas NC _G . In some embodiments, non-condensing gas NC _G Can be returned to the hermetic shell 130 to maintain the pressure balance between the hermetic shell 130 and the outside.

In step 38, the working fluid vapor phase W is passed through condenser 143 _G Condensed back into working fluid liquid phase W _L And stored in the working fluid collection tank 144.

In some embodiments, the working fluid recovery method 30 further comprises detecting the working fluid concentration in the hermetic shell 130 by the working fluid sensor 131, and when the working fluid concentration is higher than a set threshold, opening the valve 183 connected to the hermetic shell 130 and mixing the first mixed gas M1 in the hermetic shell 130 _G Into the working fluid recovery device 20.

In some embodiments, the working fluid recovery method 30 further comprises detecting the working fluid vapor phase W within the cooling tank 110 by the pressure gauge 111 _G When working fluid vapor phase W _G When the pressure of the mixture is higher than a certain set threshold, the valve 181 connecting the cooling tank 110 and the working fluid recovery device 20 are opened to suck the first mixed gas M1 in the cooling tank 110 _G 。

Returning to FIG. 1, in some embodiments, the two-phase submerged cooling system 10 also includes a bellows 170. Specifically, the bellows 170 is disposed outside the cooling tank 110 and is in communication with the cooling tank 110, and the bellows 170 is configured to passively regulate the pressure within the cooling tank 110. For example, when the pressure in the cooling tank 110 is higher than 0kPa, the vapor phase in the cooling tank 110 may flow toward the windbox 170 to balance the pressure in the cooling tank 110. Conversely, when the pressure in the cooling tank 110 is less than 0kPa, the vapor phase in the windbox 170 will flow toward the cooling tank 110 to balance the pressure in the cooling tank 110.

As shown in FIG. 1, in some embodiments, the two-phase submerged cooling system 10 further comprises a cooling tower 190 in communication with the condenser 116. The cooling tower 190 provides cooling water required for the condenser 116. Generally, the cooling water is water at normal temperature. Specifically, a first line 192 and a second line 194 are included between the cooling tower 190 and the condenser 116. The first line 192 is used to transfer water from the cooling tower 190 to the condenser 116, while the second line 194 is used to return heat exchanged water to the cooling tower 190. One or more sensors 193, such as temperature sensors, flow meters, pressure sensors, and/or other suitable sensors, may be disposed on the first line 192. One or more sensors 195, such as a temperature sensor, a flow meter, a pressure sensor, a water leak detector, and/or other suitable sensors, may also be provided on the second line 194. Further, the first and second lines 192 and 194 may each be provided with a rolling gate valve 196. In some embodiments, a check valve 197 may also be provided on the second line 194 to prevent backflow of the medium in the line.

In some embodiments, a two-way valve 198 may also be provided on the first line 192 for use with the pressure gauge 111 of the cooling tank 110. The two-way valve 198 is controlled by the pressure gauge 111 to open or close the valve, thereby realizing the on or off of the cold water in the pipeline. For example, the pressure within the cooling tank 110 is controlled by the active pressure of a two-way valve 198 on the first line 192. When the pressure in the cooling tank 110 is higher than 0kPa, the opening degree of the two-way valve 198 becomes large to increase the flow rate of the cooling water and to promote the cooling capacity of the condenser 116. Conversely, when the pressure in the cooling tank 110 is lower than 0kPa, the opening degree of the two-way valve 198 becomes smaller to reduce the flow rate of the cooling water to reduce the cooling capacity of the condenser 116.

In summary, the two-phase immersion cooling system, the working fluid recovery device and the working fluid recovery method of the present disclosure can respectively realize gas recovery of the cooling tank and the closed housing of the two-phase immersion cooling system. The advantages of the present disclosure are: (1) Recycling and discharging non-condensable gas and water gas from the cooling tank to the outside, so that the circulation efficiency of the working fluid can be improved; (2) Recovering the working fluid vapor phase from the hermetic enclosure reduces the cost of working fluid vapor phase losses and reduces greenhouse gas emissions.

The foregoing has outlined features of several embodiments or examples so that those skilled in the art may better understand the embodiments of the invention. Those skilled in the art should appreciate that the invention may be readily utilized as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments presented herein. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention, and that they may make various changes, substitutions and alterations herein without departing from the spirit and scope of the invention.

Claims

1. A working fluid recovery device comprising:

a gas mover for sucking a mixed gas containing a non-condensing gas, a water gas and a working fluid vapor phase;

the dehydrator is connected with the gas shifter and is used for removing the water vapor;

a working fluid recoverer connected with the dehydrator for recovering the working fluid vapor phase and discharging the non-condensable gas;

a first condenser connected to the working fluid recoverer for condensing the working fluid vapor phase back to a working fluid liquid phase; and

and the working fluid collection tank is connected with the first condenser and used for storing the working fluid liquid phase.

2. The working fluid recovery apparatus of claim 1 for a two-phase submerged cooling system, and further comprising:

a first valve connected with the cooling tank in the two-phase immersed cooling system, and

and the second valve is communicated with a closed shell in the two-phase immersed cooling system.

3. The working fluid recovery apparatus according to claim 2, further comprising:

a pressure gauge disposed in the cooling tank of the two-phase immersion cooling system for detecting a pressure of the working fluid in the cooling tank;

and when the pressure is higher than a first threshold value, the first valve and the working fluid recovery device are opened to suck the mixed gas in the cooling tank.

4. The working fluid recovery apparatus according to claim 2, further comprising:

a working fluid sensor disposed in the hermetic housing of the two-phase immersion cooling system for detecting a concentration of the working fluid in the hermetic housing;

wherein when the concentration is higher than a second threshold, the second valve and the working fluid recovery device are opened to suck the mixed gas in the sealed housing.

5. The working fluid recovery device of claim 1, wherein the water trap comprises:

a first adsorption unit for adsorbing the moisture at the time of adsorption and discharging the non-condensable gas and the working fluid vapor phase to the working fluid recoverer;

the first desorption unit is used for introducing external air and heating the external air during desorption so as to desorb the water vapor from the first adsorption unit;

the first electromagnetic valve is connected with the first adsorption unit and is used for communicating the gas mover with the first adsorption unit during adsorption; and

and the second electromagnetic valve is connected with the first desorption unit and is used for discharging the water vapor during desorption.

6. The working fluid recovery apparatus of claim 5, wherein the working fluid recoverer comprises:

a second adsorption unit for adsorbing the working fluid vapor phase at the time of adsorption and discharging the non-condensing gas;

a second desorption unit for introducing the non-condensable gas and heating to desorb the working fluid vapor phase from the second adsorption unit at the time of desorption;

a third electromagnetic valve for communicating the first adsorption unit and the second adsorption unit at the time of adsorption; and

a fourth solenoid valve for discharging the working fluid vapor phase to the first condenser at the time of desorption,

the first adsorption unit, the second adsorption unit, the first desorption unit and the second desorption unit are respectively a plurality of fiber adsorption materials.

7. The working fluid recovery apparatus of claim 6 for a two-phase submerged cooling system, further comprising:

the third valve is used for communicating the second adsorption unit and the second desorption unit to a closed shell or the outside of the two-phase immersed cooling system; and

and a fourth valve for communicating the working fluid collection tank to the cooling tank of the two-phase immersion cooling system.

8. A two-phase submerged cooling system comprising:

a cooling tank for containing a working fluid, a heat generating component, and a second condenser, wherein when a liquid phase of the working fluid receives heat of the heat generating component, the phase is converted into a vapor phase, and the vapor phase is condensed back to the liquid phase by the second condenser;

the upper cover is arranged at the top of the cooling groove;

the closed shell is arranged above the cooling groove, wherein when the upper cover is opened, the cooling groove is communicated with the closed shell, and part of working fluid vapor phase escapes into the closed shell; and

the working fluid recovery device according to claim 1, provided outside the cooling tank and the hermetic case and communicating the cooling tank and the hermetic case, and configured to recover the working fluid vapor phase dissipated into the hermetic case.

9. A working fluid recovery method for the working fluid recovery apparatus according to claim 1, comprising:

feeding a first mixed gas containing non-condensable gas, water gas and a working fluid vapor phase into a dehydrator through a gas mover;

adsorbing the water vapor by the water trap and delivering a second mixed gas comprising the non-condensable gas and the working fluid vapor phase to a working fluid recovery vessel;

adsorbing the working fluid vapor phase by the working fluid recoverer and discharging the non-condensable gas; and

and condensing the working fluid vapor phase back to the working fluid liquid phase through the first condenser and storing the working fluid vapor phase in a working fluid collection tank.

10. The working fluid recovery method of claim 9, further comprising:

and detecting the pressure of the working fluid vapor phase in the cooling tank by a pressure gauge arranged in the cooling tank in the two-phase immersed cooling system, wherein when the pressure is higher than a first threshold value, a first valve which is communicated with the cooling tank and the working fluid recovery device are opened so as to suck the mixed gas in the cooling tank.

11. The working fluid recovery method of claim 9, further comprising:

and detecting the concentration of the working fluid vapor phase in the closed shell through a working fluid sensor arranged in the closed shell in the two-phase immersed cooling system, wherein when the concentration is higher than a second threshold value, a second valve which is communicated with the closed shell and the working fluid recovery device are opened so as to suck the mixed gas in the closed shell.