Refrigeration system and method of operating a refrigeration system

Abstract

The application provides a refrigeration system and a working method of the refrigeration system, and relates to the technical field of refrigeration. The refrigeration system comprises a cold supplement unit and a fluorine pump unit. The cold supplement unit comprises a first loop and a compressor, and the compressor is arranged in the first loop. The fluorine pump unit comprises a first branch, a second branch, a second loop, a first heat exchanger and a fluorine pump. The first heat exchanger is arranged in the first branch, and the first branch can exchange heat with the first loop through the first heat exchanger. The fluorine pump is arranged in the second loop, and the second loop is connected with the first branch in series. The two ends of the second branch are respectively connected with the second loop, and the second branch is connected with the first branch in parallel. One of the first branch and the second branch is opened, and the other is closed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a refrigeration system and a working method of the refrigeration system. BACKGROUND

[0002] At present, the liquid cooling scheme of the data center generally adopts a cooling tower or a dry cooler to perform natural cooling. The cooling tower utilizes the wet-bulb temperature of air to perform cooling, and has strong heat dissipation capacity. However, the site of some data centers cannot provide water sources, and water entering the indoor of the data center has a security risk of water leakage. The dry cooler utilizes the dry-bulb temperature of air to perform cooling, and in the case that the outdoor environment temperature is high in summer, the heat dissipation capacity is poor, and the liquid pool temperature of the indoor liquid cooling cabinet is prone to being too high.

[0003] Therefore, the air-cooled fluorine pump scheme appears. The principle is that the compressor and the fluorine pump are connected in series in the same system. When the compressor works, the fluorine pump is short-circuited through a one-way valve connected in parallel with the fluorine pump, and at this time, the fluorine pump does not work. When the fluorine pump works, the compressor is short-circuited through another one-way valve connected in parallel with the compressor, and at this time, the compressor does not work. Since the air-cooled fluorine pump scheme needs to switch between the compressor and the fluorine pump, and the liquid refrigerant enters the compressor, the compressor is prone to damage, and the gaseous refrigerant cannot work when entering the fluorine pump. In order to ensure that the fluorine pump and the compressor can normally work, a plurality of components need to be set and a complex control scheme needs to be matched to ensure that the inlet of the compressor is gaseous refrigerant and the inlet of the fluorine pump is liquid refrigerant. At this time, the entire refrigeration system has many components and the control steps are relatively inconvenient. SUMMARY

[0004] Therefore, the present application provides a refrigeration system to solve the problem of inconvenient control of the existing refrigeration system.

[0005] According to an aspect of the present application, a refrigeration system is provided, which comprises a cold supplement unit, a fluorine pump unit and a cabinet unit.

[0006] The cold supplement unit comprises a first loop and a compressor, and the compressor is arranged in the first loop.

[0007] The fluorine pump unit comprises a first branch, a second branch, a second loop, a first heat exchanger and a fluorine pump. The first heat exchanger is arranged in the first branch, and the first branch can exchange heat with the first loop through the first heat exchanger.

[0008] The fluorine pump is arranged in the second loop, the second loop is connected in series with the first branch, and the fluorine pump unit can exchange heat with the cabinet unit. The two ends of the second branch are respectively connected with the second loop, and the second branch is connected in parallel with the first branch.

[0009] One of the first branch and the second branch is open, and the other is closed.

[0010] Preferably, the fluorine pump unit comprises a first valve and a second valve, the first valve is arranged in the first branch, the first valve can open or close the first branch, the first valve is arranged on the upstream side of the first heat exchanger, the second valve is arranged in the second branch, and the second valve can open or close the second branch.

[0011] Preferably, the fluorine pump unit further comprises a third branch and a first condenser, the first condenser is arranged in the second circuit, the first condenser is located on the downstream side of the first branch, one end of the third branch is connected with the first branch, the other end of the third branch is connected with the second circuit, and the third branch is connected with both the first valve and the first condenser in parallel.

[0012] A third valve is arranged on the third branch, and the third valve can open or close the third branch.

[0013] Preferably, the refrigeration system comprises a plurality of fluorine pump units, the plurality of first heat exchangers comprised by the plurality of fluorine pump units can exchange heat with the first circuit, and the plurality of first heat exchangers comprised by the plurality of fluorine pump units are connected in parallel.

[0014] Preferably, the fluorine pump unit further comprises a second heat exchanger, and the second heat exchanger is arranged in the second circuit.

[0015] The cabinet unit comprises a liquid pool and a third circuit, the third circuit is connected in series with the liquid pool, and the third circuit exchanges heat with the first circuit through the second heat exchanger.

[0016] According to another aspect of the present application, a method for operating a refrigeration system is provided. The method for operating the refrigeration system is based on the refrigeration system, which comprises a subcooling unit and a fluorine pump unit. The subcooling unit comprises a first circuit and a compressor, and the compressor is arranged in the first circuit. The fluorine pump unit comprises a first branch, a second branch, a third branch, a second circuit, a first heat exchanger, a fluorine pump, a first valve and a first condenser. The first heat exchanger and the first valve are arranged in the first branch, and the first branch can exchange heat with the first circuit through the first heat exchanger. The fluorine pump is arranged in the second circuit, and the second circuit is connected in series with the first branch. The second branch is connected to the second circuit at both ends, and the second branch is connected in parallel with the first branch. The first condenser is arranged in the second circuit, and the first condenser is located on the downstream side of the first branch. One end of the third branch is connected to the first branch, and the other end of the third branch is connected to the second circuit. The third branch is connected in parallel with both the first valve and the first condenser.

[0017] The method for operating the refrigeration system comprises:

[0018] A first detection step is performed to detect a refrigerant temperature at an inlet of the first condenser to obtain an inlet temperature.

[0019] A second judgment step is performed to judge whether the inlet temperature is greater than a preset temperature. Based on the judgment result, it is determined whether the first branch and the second branch exchange heat through the first branch.

[0020] Preferably, based on the judgment result, it is determined whether the first branch and the second branch exchange heat through the first branch, which comprises:

[0021] When the inlet temperature is less than or equal to the preset temperature, the first branch does not exchange heat with the first circuit through the first heat exchanger, the first condenser and the fluorine pump are operated, and the first detection step is performed.

[0022] When the inlet temperature is greater than the preset temperature, the first branch exchanges heat with the first circuit through the first heat exchanger.

[0023] Preferably, when the inlet temperature is greater than the preset temperature, the method for operating the refrigeration system further comprises:

[0024] A second detection step is performed to detect a temperature of an environment in which the refrigeration system is located to obtain an environmental temperature.

[0025] The second judging step judges whether the ambient temperature is greater than the preset temperature, and when the ambient temperature is greater than the preset temperature, the first condenser stops working and the compressor works; when the ambient temperature is less than or equal to the preset temperature, both the first condenser and the compressor work.

[0026] Preferably, the working method of the refrigeration system further comprises:

[0027] The third detecting step detects the refrigerant temperature at the inlet of the first condenser to obtain the inlet temperature;

[0028] The third judging step judges whether the inlet temperature is greater than a comparison temperature, and based on the judging result and the running condition of the compressor, controls whether the compressor runs, wherein the comparison temperature is the difference between the preset temperature and a set temperature.

[0029] Preferably, based on the judging result and the running condition of the compressor, controlling whether the compressor runs comprises:

[0030] When the inlet temperature is less than or equal to the comparison temperature and the compressor is running at the lowest speed, the compressor stops, and the refrigeration system executes the first detecting step;

[0031] When the inlet temperature is greater than the comparison temperature or the compressor is not running at the lowest speed, the refrigeration system executes the third detecting step.

[0032] When the fluorine pump works, the first branch is closed and the second branch is opened, at this time, the liquid refrigerant flows through the second branch, the fluorine pump and the second circuit, and the liquid refrigerant will not pass through the first circuit where the compressor is located.

[0033] When the compressor works, the first branch is opened and the second branch is closed, and the refrigerant in the first circuit exchanges heat with the first branch at the first heat exchanger, and the gaseous refrigerant in the first circuit will not enter the second circuit where the fluorine pump is located, and the gaseous refrigerant will not pass through the fluorine pump.

[0034] Since the compressor and the fluorine pump are located in the second circuit and the first circuit respectively, when the fluorine pump works, the liquid refrigerant will not pass through the compressor, and when the compressor works, the gaseous refrigerant will not pass through the fluorine pump, which ensures that the inlet of the compressor is gaseous refrigerant and the inlet of the fluorine pump is liquid refrigerant, and the refrigeration system of the present application does not need to set multiple components, and when switching the fluorine pump and the compressor, only needs to switch between the first branch and the second branch, simplifying the control steps of the refrigeration system. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0036] Figure 1 A structural schematic diagram of the refrigeration system of embodiment one is shown.

[0037] Figure 2 A schematic diagram of the refrigeration system of embodiment one in a first mode is shown.

[0038] Figure 3 A schematic diagram of the refrigeration system of embodiment one in a second mode is shown.

[0039] Figure 4 A schematic diagram of the refrigeration system of embodiment one in a third mode is shown.

[0040] Figure 5 A structural diagram of the refrigeration system of embodiment two is shown.

[0041] Figure 6 A logic diagram of the working method of the refrigeration system is shown.

[0042] Figure legend: 1 - cold supplement unit; 11 - compressor; 12 - second condenser; 13 - throttling element; 14 - first circuit; 2 - fluorine pump unit; 211 - first valve; 212 - second valve; 213 - third valve; 221 - first heat exchanger; 222 - second heat exchanger; 23 - fluorine pump; 241 - first branch; 242 - second branch; 243 - third branch; 25 - second circuit; 261 - first connecting valve; 262 - second connecting valve; 27 - dry filter; 28 - liquid storage tank; 29 - first condenser; 3 - cabinet unit; 31 - third circuit; 32 - cooling liquid pump; 33 - liquid pool. DETAILED DESCRIPTION

[0043] The following detailed description is provided to help the reader understand the method, device and / or system described herein. However, various changes, modifications and equivalents can be apparent to those skilled in the art after understanding the disclosure of the present application. For example, the order of the operations described herein is merely an example, and is not limited to the order set forth herein, and changes can be made that will be apparent to those skilled in the art after understanding the disclosure of the present application, except for the operations that must occur in a specific order. In addition, the description of features known in the art can be omitted in order to improve clarity and brevity.

[0044] The features described can be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatus and / or systems described herein to one of ordinary skill in the art.

[0045] Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", "directly on top of", or "directly covering" another element, there are no other elements interposed therebetween.

[0046] As used herein, the term "and / or" includes any one of the listed items and any combination of any two or more of the listed items.

[0047] Although terms such as "first", "second", and "third" can be used herein to describe various members, components, regions, layers or sections, these members, components, regions, layers or sections are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or section from another member, component, region, layer or section. Thus, a member, component, region, layer or section referred to as a first member, component, region, layer or section in one example described herein can also be referred to as a second member, component, region, layer or section in another example without departing from the teachings of the examples.

[0048] For ease of description, spatial relationship terms, such as "on", "upper", "beneath", and "lower", can be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatial relationship terms can be intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, a component described as on "top" of another component would then be oriented on the "bottom" of the other component. Accordingly, the term "on" encompasses both an "on" and "under" orientation in accordance with how the device is oriented in space. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatial relationship terms used herein interpreted accordingly.

[0049] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including" and "has" are inclusive and permit the presence of one or more other features, numbers, operations, members, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, members, elements and / or combinations thereof.

[0050] Variations in the shapes illustrated in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include variations in shapes that occur during manufacturing.

[0051] Features of the examples described herein can be combined with one another in a variety of ways. Furthermore, although the examples described herein have a variety of configurations, other configurations are possible in accordance with the disclosure herein, as will be apparent upon consideration of the specification as a whole.

[0052] One aspect of the present disclosure provides a refrigeration system, such as Figure 1 As shown, the refrigeration system includes a subcooling unit 1, a fluorine pump unit 2 and a cabinet unit 3; the subcooling unit 1 includes a first circuit 14 and a compressor 11, the compressor 11 is arranged in the first circuit 14; the fluorine pump unit 2 includes a first branch 241, a second branch 242, a second circuit 25, a first heat exchanger 221 and a fluorine pump 23, the first heat exchanger 221 is arranged in the first branch 241, the first branch 241 can exchange heat with the first circuit 14 through the first heat exchanger 221; the fluorine pump 23 is arranged in the second circuit 25, the second circuit 25 is connected in series with the first branch 241, the fluorine pump unit 2 can exchange heat with the cabinet unit 3; two ends of the second branch 242 are respectively connected with the second circuit 25, the second branch 242 is connected in parallel with the first branch 241; one of the first branch 241 and the second branch 242 is opened, and the other is closed.

[0053] When the fluorine pump unit 2 works and the subcooling unit 1 does not work, the first branch 241 is closed and the second branch 242 is opened, at this time, the liquid refrigerant flows through the second branch 242, the fluorine pump 23 and the second circuit 25, the fluorine pump unit 2 can exchange heat with the cabinet unit 3 to achieve heat dissipation of the server, in the process, the liquid refrigerant will not pass through the first circuit 14 where the compressor 11 is arranged.

[0054] When the cold supplement unit 1 works and the fluorine pump unit 2 does not work, the first branch 241 is opened, the second branch 242 is closed, the refrigerant in the fluorine pump unit 2 can exchange heat with the refrigerant in the first loop 14 at the first heat exchanger 221 and then pass through the fluorine pump 23, and the fluorine pump unit 2 can exchange heat with the cabinet unit 3 to achieve the heat dissipation of the server. In the process, the gaseous refrigerant in the first loop 14 cannot enter the second loop 25 where the fluorine pump 23 is located, and the gaseous refrigerant cannot pass through the fluorine pump 23.

[0055] Since the compressor 11 and the fluorine pump 23 are located in the second loop 25 and the first loop 14 respectively, when the fluorine pump 23 works, the liquid refrigerant cannot pass through the compressor 11, and when the compressor 11 works, the gaseous refrigerant cannot pass through the fluorine pump 23, which ensures that the inlet of the compressor 11 is gaseous refrigerant and the inlet of the fluorine pump 23 is liquid refrigerant. In addition, the refrigeration system of the present application does not need to set multiple components, and only needs to switch between the first branch 241 and the second branch 242 when switching between the fluorine pump unit 2 and the cold supplement unit 1, which simplifies the control steps of the refrigeration system.

[0056] It should be noted that the working of the fluorine pump unit 2 mentioned above refers to the operation of the fluorine pump 23 and the first condenser 29, and the non-working of the fluorine pump unit 2 refers to the non-operation of the first condenser 29 and the operation of the fluorine pump 23. At this time, the fluorine pump unit 2 cannot dissipate heat and only serves as a medium for heat transfer.

[0057] In addition, the fluorine pump unit 2 and the cold supplement unit 1 are independent systems and do not interfere with each other, which makes the refrigeration system more stable and the structure more simple and reliable.

[0058] As shown in Figure 1 , the refrigeration system comprises a first valve 211 and a second valve 212. The first valve 211 is arranged on the first branch 241 and can open or close the first branch 241. The second valve 212 is arranged on the second branch 242 and can open or close the second branch 242. The first valve 211 is arranged on the upstream side of the first heat exchanger 221.

[0059] Further, as shown in Figure 1 , the refrigeration system further comprises a first condenser 29 (the first condenser 29 can comprise a dry cooler and a fan, the dry cooler is arranged on the second loop 25, and the fan is arranged on one side of the dry cooler and blows air to the dry cooler). The first condenser 29 is arranged on the second loop 25 and located on the upstream side of the first branch 241. Here, the "upstream side" and the "downstream side" opposite to the "upstream side" are determined according to the flow direction of the refrigerant.

[0060] Further, the refrigeration system further comprises a second heat exchanger 222, a drying filter 27 and a liquid storage tank 28, the second heat exchanger 222, the drying filter 27 and the liquid storage tank 28 are all arranged on the second circuit 25, the first condenser 29 is located on the downstream side of the second heat exchanger 222, the drying filter 27 is located between the second heat exchanger 222 and the fluorine pump 23, and the liquid storage tank 28 is arranged on the upstream side of the fluorine pump 23.

[0061] Optionally, the refrigeration system further comprises a first connecting valve 261 and a second connecting valve 262, the first connecting valve 261 and the second connecting valve 262 are both arranged on the second circuit 25, the first connecting valve 261 is located between the first condenser 29 and the second heat exchanger 222, and the second connecting valve 262 is located between the drying filter 27 and the second heat exchanger 222.

[0062] As shown in Figure 1 , the subcooling unit comprises a second condenser 12 and a throttling element 13, the second condenser 12 and the throttling element 13 are both arranged on the first circuit 14.

[0063] Further, the cabinet unit comprises a third circuit 31, a cooling liquid pump 32 and a liquid pool 33, the third circuit 31 is connected in series with the liquid pool 33, the cooling liquid pump 32 is arranged on the third circuit 31 and can provide power for circulation of cooling liquid in the third circuit 31 and the liquid pool 33, and the third circuit 31 can exchange heat with the second circuit 25 through the second heat exchanger 222.

[0064] Optionally, in the first embodiment of the present application, as shown in Figure 1 , the refrigeration system comprises one fluorine pump unit 2, and in the second embodiment of the present application, as shown in Figure 5 , the refrigeration system comprises a plurality of fluorine pump units 2, the plurality of first heat exchangers 221 comprised by the plurality of fluorine pump units 2 can all exchange heat with the first circuit 14, and the plurality of first heat exchangers 221 comprised by the plurality of fluorine pump units 2 are connected in parallel, so that one subcooling unit 1 is matched with the plurality of fluorine pump units 2, thereby saving cost.

[0065] In the present application, the refrigeration system can realize switching between different modes by controlling the on-off of the first valve 211, the second valve 212 and the third valve 213, and taking the first embodiment as an example, the refrigeration system is switched between three modes.

[0066] In the first mode, cooling is only performed by the fluorine pump 23, at this time, as shown in Figure 2As shown in the figure (where the dashed part is the part without refrigerant flowing through), the first valve 211 and the third valve 213 are closed, and the second valve 212 is opened. In this way, the first branch 241 and the third branch 243 are both closed, and the second branch 242 is opened. At this time, the refrigerant that has passed through the second heat exchanger 222 is sequentially returned to the second heat exchanger 222 through the first condenser 29, the second branch 242, and the fluorine pump 23, so as to realize the circulation of the refrigerant in the second loop 25. The refrigerant flowing through the first condenser 29 is cooled to realize the cooling of the refrigerant. The refrigerant in the second loop 25 and the cooling liquid in the third loop 31 are cooled through the second heat exchanger 222, so as to realize the cooling of the cooling liquid in the liquid pool 33, thereby facilitating the cooling of the server arranged in the liquid pool 33.

[0067] In the second mode, the fluorine pump 23 and the compressor 11 are both running. At this time, the ambient temperature is relatively high, and the cooling capacity of the fluorine pump 23 is reduced. The cooling is supplemented by the running of the compressor 11 of the cooling supplement unit 1. As shown in the figure, Figure 3 As shown in the figure (where the dashed part is the part without refrigerant flowing through), the second valve 212 and the third valve 213 are both closed, and the first valve 211 is opened. In this way, the third branch 243 and the second branch 242 are disconnected, and the first branch 241 is opened. At this time, the refrigerant that has passed through the second heat exchanger 222 is sequentially returned to the second heat exchanger 222 through the first condenser 29, the first branch 241, the first heat exchanger 221, and the fluorine pump 23, so as to realize the circulation of the refrigerant in the second loop 25. The refrigerant that has passed through the second heat exchanger 222 is preliminarily cooled when passing through the first condenser 29. Then, the refrigerant flows to the first heat exchanger 221 through the first branch 241, and exchanges heat with the refrigerant in the first loop 14 that is forcedly cooled by the compressor 11, so as to realize the further cooling of the refrigerant flowing through the first branch 241. The refrigerant that has passed through the first heat exchanger 221 is cooled twice, and then flows to the second heat exchanger 222 through the fluorine pump 23, and exchanges heat with the third loop 31, so as to realize the cooling of the cooling liquid in the liquid pool 33, thereby facilitating the cooling of the server arranged in the liquid pool 33.

[0068] In the third mode, the ambient temperature is higher than a predetermined temperature (the predetermined temperature here is the expected temperature at the outlet of the first condenser 29, which can be obtained by reverse deduction according to the expected temperature of the cooling liquid in the liquid pool 33). The fluorine pump unit 2 cannot achieve the cooling effect, and the cooling supplement unit 1 is running. At this time, the fluorine pump unit 2 only serves as a medium for heat transfer. At this time, as shown in the figure, Figure 4As shown, the dashed lines represent the sections where no refrigerant flows. The first branch 241 and the second branch 242 are closed, while the third branch 243 is open. The refrigerant that has undergone heat exchange in the second heat exchanger 222 flows sequentially through the third branch 243, the first branch 241, the first heat exchanger 221, and the refrigerant pump 23 back to the second heat exchanger 222. The refrigerant that has undergone heat exchange in the second heat exchanger 222 exchanges heat with the refrigerant in the first circuit 14 that has been forcibly cooled by the compressor 11, thereby cooling the refrigerant flowing through the first branch 241. The cooled refrigerant then flows through the refrigerant pump 23 to the second heat exchanger 222 to exchange heat with the third circuit 31, thus cooling the refrigerant pump 23.

[0069] In summary, when the ambient temperature decreases, only refrigerant pump unit 2 is used for cooling; when the ambient temperature is relatively high, both supplementary cooling unit 1 and refrigerant pump unit 2 operate simultaneously; when the ambient temperature is higher than the predetermined temperature, supplementary cooling unit 1 is used for cooling. In this way, the cooling system can be configured with different operating modes according to different ambient temperatures, increasing the applicability of the cooling system. Although compressor 11 is installed in the cooling system, it is only used in high-temperature environments during summer, reducing the data center's annual PUE (Power Usage Effectiveness).

[0070] Furthermore, the refrigerant entering cabinet unit 3 is non-toxic and harmless. In the event of a leak, the refrigerant turns into a gas, ensuring the safety of the servers and personnel. Simultaneously, the cooling system uses Fluorine Pump 23 refrigerant, and the diameter of its connecting pipes is much smaller than that used in water systems, significantly reducing on-site installation work and costs.

[0071] According to another aspect of this application, a method for operating a refrigeration system is provided, such as... Figure 6 As shown. The working method of the refrigeration system includes:

[0072] First detection step: Detect the refrigerant temperature at the inlet of the first condenser to obtain the inlet temperature Tc;

[0073] The first judgment step is to determine whether the inlet temperature Tc is greater than the preset temperature Tm, and based on the judgment result, to control whether the first branch and the second branch exchange heat through the first branch.

[0074] Specifically, controlling whether the first branch and the second branch exchange heat through the first branch includes:

[0075] When the inlet temperature Tc is less than or equal to the preset temperature Tm, the first branch and the first circuit do not exchange heat through the first heat exchanger, the first condenser and the fluorine pump work, and the detection step is performed; at this time, the second valve is opened, and the first valve and the third valve 213 are closed, and only the fluorine pump unit 2 works to meet the heat dissipation requirement, and the cold supplement unit 1 does not work.

[0076] When the inlet temperature Tc is greater than the preset temperature Tm, the first branch and the first circuit exchange heat through the first heat exchanger. At this time, only the fluorine pump unit 2 cannot meet the heat dissipation requirement, and the cold supplement unit 1 needs to work.

[0077] When the inlet temperature Tc is greater than the preset temperature Tm, the working method of the refrigeration system further comprises:

[0078] The second detection step detects the ambient temperature of the refrigeration system to obtain the ambient temperature T0.

[0079] The second judgment step judges whether the ambient temperature T0 is greater than the preset temperature Tm. When the ambient temperature T0 is greater than the preset temperature Tm, the first condenser stops working, and the compressor works. At this time, the temperature of the refrigerant at the inlet of the first condenser 29 is higher than the ambient temperature, and the first condenser 29 of the fluorine pump unit 2 cannot dissipate heat, and the cold supplement unit 1 is used to work to dissipate heat. At this time, the fluorine pump unit 2 acts as a heat transfer medium, that is, the first condenser 29 does not work, and the compressor 11 works. When the ambient temperature T0 is less than or equal to the preset temperature Tm, the first condenser and the compressor work. At this time, the first condenser 29 of the fluorine pump unit 2 can dissipate heat, and its heat dissipation capacity is insufficient to meet the heat dissipation requirement, and the cold supplement unit 1 needs to be cooled. The cold supplement unit 1 exchanges heat with the fluorine pump unit 2 through the first heat exchanger 221 to cool the fluorine pump unit 2.

[0080] Further, the working method of the refrigeration system further comprises:

[0081] The third detection step detects the refrigerant temperature at the inlet of the first condenser to obtain the inlet temperature Tc, and compares the inlet temperature Tc with the comparison temperature Tb, which is the difference between the preset temperature Tm and the set temperature k, that is, Tb=Tm-k.

[0082] In this step, the temperature at the inlet of the first condenser 29 changes with the operation of the compressor 11. The inlet temperature Tc is the temperature of the refrigerant at the inlet of the first condenser 29 when the refrigerant of the fluorine pump unit 2 flows through the first condenser 29, and the inlet temperature Tc can be understood as the temperature of the refrigerant after passing through the first heat exchanger 221 when the refrigerant of the fluorine pump unit 2 does not flow through the first condenser 29. The set temperature k can be selected as required, for example, the set temperature k can be 1℃, 2℃ or 5℃, etc.

[0083] The third judging step is to judge whether the compressor meets the minimum rotation speed operation and the inlet temperature Tc meets less than or equal to the comparison temperature Tb, and to control whether the compressor operates.

[0084] When the inlet temperature Tc is less than or equal to the comparison temperature Tb and the compressor 11 is in the minimum rotation speed operation (i.e., the compressor 11 is in the minimum rotation speed), the compressor 11 stops, and the refrigeration system performs the first detecting step. When the inlet temperature Tc is less than or equal to the comparison temperature Tb and the compressor 11 is in the minimum rotation speed operation, the supplemental cooling unit 1 does not need to operate, i.e., the compressor 11 stops working.

[0085] When the inlet temperature Tc is greater than the comparison temperature Tb or the compressor 11 is not in the minimum rotation speed operation, the refrigeration system performs the third detecting step. At this time, only the fluorine pump unit 2 working cannot meet the heat dissipation demand, and the supplemental cooling unit 1 continues to work, i.e., the compressor 11 continues to operate.

[0086] Through the above-mentioned working method of the refrigeration system, the switching of the three modes of the refrigeration system can be realized, and the specific process is as follows:

[0087] First, the temperature of the refrigerant at the inlet of the first condenser 29 is detected to obtain the inlet temperature Tc, and then the first judging step is performed. When the inlet temperature Tc is less than or equal to the preset temperature Tm, the first mode is switched to, at this time, the first valve 211 and the third valve 213 are closed, the second valve 212 is opened, the fluorine pump unit 2 works, the supplemental cooling unit 1 works, and the first branch 241 and the first circuit 14 do not exchange heat through the first heat exchanger 221. In this mode, the heat dissipation amount of the fluorine pump 23 can meet the heat dissipation demand of the server in the liquid pool 33, and the natural heat dissipation has very low energy consumption.

[0088] Further, when the inlet temperature Tc is greater than the preset temperature Tm, the first branch 241 and the first circuit 14 exchange heat through the first heat exchanger 221, at this time, the second mode or the third mode is determined to be executed based on the further judging result.

[0089] Specifically, when the inlet temperature Tc is greater than the preset temperature Tm, a second detection step is performed to obtain the ambient temperature T0, and then a second judgment step is performed. When the ambient temperature T0 is less than or equal to the preset temperature Tm, the ambient temperature is low, the fluorine pump unit 2 still has a certain heat dissipation capacity, but the heat dissipation demand of the servers in the liquid pool 33 cannot be met only by the fluorine pump unit 2. At this time, the second mode is switched to, the second valve 212 and the third valve 213 are both closed, the first valve 211 is opened, and the fluorine pump unit 2 and the cold supplement unit 1 both work, that is, the first condenser 29 and the compressor 11 both operate. The refrigerant is preliminarily cooled when passing through the first condenser 29, and then exchanges heat with the refrigerant in the first circuit 14 forced to cool by the compressor 11 in the second heat exchanger 222, so as to further cool the refrigerant flowing in the first branch 241. At the same time, in the second mode, the fluorine pump 23 reaches the rated speed, and the compressor 11 can adjust the speed of its own operation according to the ambient temperature and the cooling demand. In the process of operating the refrigeration system in the second mode, a third detection step is performed to obtain the inlet temperature Tc. If the inlet temperature Tc is less than or equal to the comparison temperature Tb, and the compressor 11 is operating at the lowest speed, the compressor 11 is stopped, and the first detection step is returned to. If the refrigeration system meets one of the conditions that the inlet temperature Tc is greater than the comparison temperature Tb or the compressor 11 is not operating at the lowest speed, the refrigeration system continues to operate in the second mode, and the third detection step is continued.

[0090] When the ambient temperature T0 is greater than the preset temperature Tm, the ambient temperature T0 is high at this time, and the fluorine pump unit 2 cannot dissipate heat through the first condenser 29, but instead absorbs heat from the air. At this time, the first branch 241 and the second branch 242 are closed, and the third branch 243 is opened, so that the refrigeration system is switched to the third mode. At this time, the cold supplement unit 1 works, the fluorine pump unit 2 does not work, and the fluorine pump unit 2 only serves as a medium for heat transfer. In the third mode, the first condenser 29 stops working, the compressor 11 works, and the refrigerant in the fluorine pump unit 2 exchanges heat with the refrigerant in the first circuit 14 forced to cool by the compressor 11 when passing through the second heat exchanger 222, so as to cool the refrigerant in the fluorine pump unit 2. At the same time, in the third mode, the fluorine pump 23 reaches the maximum speed, and the compressor 11 is automatically controlled according to the ambient temperature and the cooling demand. In the process of operating the refrigeration system in the third mode, a third detection step is performed to obtain the inlet temperature Tc. If the inlet temperature Tc is less than or equal to the comparison temperature Tb, and the compressor 11 is operating at the lowest speed, the compressor 11 is stopped, and the first detection step is returned to. If the refrigeration system meets one of the conditions that the inlet temperature Tc is greater than the comparison temperature Tb or the compressor 11 is not operating at the lowest speed, the refrigeration system continues to operate in the third mode, and the third detection step is continued.

[0091] By the above-mentioned working method of the refrigeration system, the switching among the three modes of the refrigeration system can be realized by controlling the opening and closing of the first valve 211, the second valve 212 and the third valve 213, and the control steps of the refrigeration system are simplified.

[0092] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigeration system characterized by, The refrigeration system comprises a cold supplement unit, a fluorine pump unit and a cabinet unit; The cold supplement unit comprises a first loop and a compressor, and the compressor is arranged in the first loop; The fluorine pump unit comprises a first branch, a second branch, a second loop, a first heat exchanger and a fluorine pump, the first heat exchanger is arranged in the first branch, and the first branch can exchange heat with the first loop through the first heat exchanger; The fluorine pump is arranged in the second loop, the second loop is connected with the first branch in series, the fluorine pump unit can exchange heat with the cabinet unit, two ends of the second branch are respectively connected with the second loop, and the second branch is connected with the first branch in parallel; One of the first branch and the second branch is opened, and the other is closed; The fluorine pump unit further comprises a second heat exchanger, and the second heat exchanger is arranged in the second loop; The cabinet unit comprises a liquid pool and a third loop, the third loop is connected with the liquid pool in series, and the third loop exchanges heat with the first loop through the second heat exchanger.

2. The refrigeration system of claim 1, wherein, The fluorine pump unit comprises a first valve and a second valve, the first valve is arranged in the first branch, the first valve can open or close the first branch, the first valve is arranged on the upstream side of the first heat exchanger, and the second valve is arranged in the second branch.

3. The refrigeration system of claim 2, wherein, The fluorine pump unit further comprises a third branch and a first condenser, the first condenser is arranged in the second loop, the first condenser is located on the downstream side of the first branch, one end of the third branch is connected with the first branch, the other end of the third branch is connected with the second loop, and the third branch is connected with both the first valve and the first condenser in parallel; A third valve is arranged on the third branch, and the third valve can open or close the third branch.

4. The refrigeration system of claim 1, wherein, The refrigeration system comprises a plurality of fluorine pump units, a plurality of first heat exchangers included in the plurality of fluorine pump units can exchange heat with the first loop, and the plurality of first heat exchangers are connected in parallel.

5. A method of operating a refrigeration system, characterized by, The working method of the refrigeration system relies on the refrigeration system, the refrigeration system comprises a cold supplement unit and a fluorine pump unit; the cold supplement unit comprises a first loop and a compressor, and the compressor is arranged in the first loop; the fluorine pump unit comprises a first branch, a second branch, a third branch, a second loop, a first heat exchanger, a fluorine pump, a first valve and a first condenser, the first heat exchanger and the first valve are arranged in the first branch, and the first branch can exchange heat with the first loop through the first heat exchanger; the fluorine pump is arranged in the second loop, and the second loop is connected with the first branch in series; two ends of the second branch are connected with the second loop respectively, and the second branch is connected with the first branch in parallel; the first condenser is arranged in the second loop, and the first condenser is located on the downstream side of the first branch; one end of the third branch is connected with the first branch, and the other end of the third branch is connected with the second loop; the third branch is connected with the first valve and the first condenser in parallel; the fluorine pump unit further comprises a second heat exchanger, and the second heat exchanger is arranged in the second loop; The cabinet unit comprises a liquid pool and a third loop, the third loop is connected with the liquid pool in series, and the third loop exchanges heat with the first loop through the second heat exchanger; The working method of the refrigeration system comprises: A first detection step; the refrigerant temperature at the inlet of the first condenser is detected to obtain an inlet temperature; A second judgment step; whether the inlet temperature is greater than a preset temperature is judged, and based on the judgment result, whether the first branch and the second branch exchange heat through the first branch is controlled.

6. The method of operating a refrigeration system of claim 5, wherein, Based on the judgment result, whether the first branch and the second branch exchange heat through the first branch comprises: When the inlet temperature is less than or equal to the preset temperature, the first branch does not exchange heat with the first loop through the first heat exchanger, the first condenser and the fluorine pump work, and the first detection step is executed; When the inlet temperature is greater than the preset temperature, the first branch exchanges heat with the first loop through the first heat exchanger.

7. The method of operating a refrigeration system of claim 6, wherein, When the inlet temperature is greater than the preset temperature, the working method of the refrigeration system further comprises: A second detection step, the temperature of the environment in which the refrigeration system is located is detected to obtain an environmental temperature; A second judgment step, whether the environmental temperature is greater than the preset temperature is judged, when the environmental temperature is greater than the preset temperature, the first condenser stops working, and the compressor works; when the environmental temperature is less than or equal to the preset temperature, the first condenser and the compressor both work.

8. The method of operating a refrigeration system of claim 7, wherein, The working method of the refrigeration system further comprises: A third detection step; the refrigerant temperature at the inlet of the first condenser is detected to obtain the inlet temperature; A third judgment step; whether the inlet temperature is greater than a comparison temperature is judged, based on the judgment result and the operation condition of the compressor, whether the compressor operates is controlled, and the comparison temperature is the difference between the preset temperature and a set temperature.

9. The method of operating a refrigeration system of claim 8, wherein, Based on the judgment result and the operation condition of the compressor, whether the compressor is controlled to operate includes: When the inlet temperature is less than or equal to the comparison temperature and the compressor is operated at the lowest speed, the compressor is stopped, and the refrigeration system performs the first detection step; When the inlet temperature is greater than the comparison temperature or the compressor is not operated at the lowest speed, the refrigeration system performs the third detection step.

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