Indirect evaporative cooling unit with waste heat recovery

Abstract

The application provides an indirect evaporative cooling unit with waste heat recovery, and relates to the technical field of cooling equipment. The indirect evaporative cooling unit with waste heat recovery comprises a water source heat pump system, a circulating heat pump subsystem connected with a first evaporator, so that the circulating heat pump subsystem exchanges heat with the first evaporator and then supplies heat; an indirect evaporative cooling system comprising a first condenser, a heat exchange device and a fan, the heat exchange device being connected with the first condenser and the first evaporator, the heat exchange device exchanging heat with indoor air and sending air through the fan, so that the heat exchange device is in conduction with the first condenser in a first mode and in conduction with the first evaporator in a second mode. The indoor heat can be fully recovered, thereby greatly improving the energy efficiency of the overall device.

Description

Technical Field

[0001] This application relates to the field of cooling equipment technology, and more specifically, to an indirect evaporative chiller unit with waste heat recovery. Background Technology

[0002] The PUE (Power Usage Effectiveness) requirements for data center cooling air conditioning are becoming increasingly stringent. Traditional mechanical refrigeration methods for air conditioning consume too much energy and cannot meet the requirements of green building solutions. Due to energy-saving needs, methods that utilize natural cold sources for cooling have gradually emerged in the market. These methods mainly employ indirect evaporative cooling technology.

[0003] In related technologies, most data centers use indirect evaporative chillers that dissipate heat from the computer room to the outside during operation, and this heat cannot be utilized. Summary of the Invention

[0004] The purpose of this application is to provide an indirect evaporative chiller unit with waste heat recovery, which can recover and utilize indoor heat and reduce energy consumption.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides an indirect evaporative cooling unit with waste heat recovery, comprising: a water source heat pump system having a first evaporator and a circulating heat pump subsystem connected to the first evaporator, such that the circulating heat pump subsystem provides heating after exchanging heat with the first evaporator; and an indirect evaporative cooling system having a first condenser, a heat exchange device, and a fan, wherein the heat exchange device is connected to the first condenser and the first evaporator, the heat exchange device exchanges heat with indoor air, and the fan delivers air, such that in a first mode, the heat exchange device is connected to the first condenser, and in a second mode, the heat exchange device is connected to the first evaporator.

[0007] In the above implementation process, the first evaporator is connected to the circulating heat pump subsystem and the heat exchange device respectively. The indirect evaporative cooling system includes a first condenser and a heat exchange device that are interconnected for heat exchange with the room. In the first mode, only the indirect evaporative cooling system operates. In the second mode, the heat generated during the heat exchange between the heat exchange device and the room is used to exchange heat with the first evaporator, so that the water source heat pump system can work and provide heat. This can fully recover the heat in the room, thereby greatly improving the energy efficiency of the overall device.

[0008] In some embodiments, the heat exchange device includes a cooling tower, a surface cooler, a second evaporator, a circulation pipeline, and a refrigeration pipeline. The cooling tower is connected to the surface cooler through the circulation pipeline, and the second evaporator is connected to the first condenser through the refrigeration pipeline. The surface cooler and the second evaporator are arranged sequentially along the air delivery direction of the fan, and the first condenser is connected to the circulation pipeline.

[0009] In the above process, the cooling tower is connected to the surface cooler through a circulation pipeline, the second evaporator is connected to the first condenser through a refrigeration pipeline, and the first condenser is connected to the circulation pipeline. This allows for full utilization of natural resources and mechanical refrigeration, enabling different operating modes. This allows the cooling tower and the first condenser to exchange heat with the surface cooler, and the second evaporator to exchange heat with the first condenser, thereby achieving heat exchange with the indoor air. This significantly reduces the overall energy consumption of the device and improves its overall energy efficiency.

[0010] In some embodiments, the circulation pipeline includes a first circulation branch and a second circulation branch, the first circulation branch being connected between the inlet of the cooling tower and the outlet of the surface cooler, the second circulation branch being connected between the outlet of the cooling tower and the inlet of the surface cooler, and at least a portion of the structure of the first circulation branch being connected to the second circulation branch.

[0011] In the above implementation process, the first circulation branch and the second circulation branch are connected at different locations, which can realize the connection between the cooling tower and the surface cooler. Furthermore, natural resources can be selectively utilized according to different modes, which is conducive to reducing the energy consumption of the overall device.

[0012] In some embodiments, the first circulation branch is provided with a first valve, a second valve, a third valve and an electric multi-way valve. The first valve is connected between the second valve and the outlet of the surface cooler. The second valve is connected to the first condenser and the second circulation branch respectively. One end of the third valve is connected between the first valve and the second valve, and the other end of the third valve is connected to the inlet of the cooling tower through the electric multi-way valve.

[0013] In the above implementation process, one end of the second valve is connected to the first valve, and the other end is connected to the first condenser and the second circulation branch respectively. The third valve is connected between the first valve and the second valve, so that by switching the conduction of the second valve and the third valve, different modes can be realized according to different working environments, which improves the adaptability of the overall device and also helps to reduce the energy consumption of the overall device.

[0014] In some embodiments, a first water pump and a fourth valve are provided on the second circulation branch, and the second valve is connected between the first water pump and the fourth valve, which is beneficial to the heat exchange between the cooling tower and the surface cooler and improves the heat exchange efficiency.

[0015] In some embodiments, the refrigeration pipeline includes a first refrigeration sub-pipeline and a second refrigeration sub-pipeline, wherein the first refrigeration sub-pipeline and the second refrigeration sub-pipeline are connected in parallel to achieve mechanical refrigeration and complete the switching for different environments.

[0016] In some embodiments, the first refrigeration sub-pipeline has a first compressor and a first expansion valve, the first compressor is directed from the outlet of the second evaporator to the inlet of the first condenser, and the first expansion valve is directed from the outlet of the first condenser to the inlet of the second evaporator.

[0017] The second refrigeration sub-pipeline has a second compressor and a second expansion valve. The second compressor is directed from the outlet of the second evaporator to the inlet of the first condenser, and the second expansion valve is directed from the outlet of the first condenser to the inlet of the second evaporator.

[0018] In some embodiments, the indirect evaporative cooling system further includes connecting pipes configured to connect to the inlet and outlet of the first condenser, respectively. The connection between the connecting pipes and the first condenser enables heat exchange with the first condenser, thereby providing high-temperature hot water. This facilitates the recovery of indoor heat and provides cooling for the room, ensuring full utilization of energy.

[0019] In some embodiments, the first evaporator is connected to the heat exchange device via a heat exchange pipeline. In the first mode, the heat exchange pipeline is in a closed state, and in the second mode, the heat exchange pipeline is in a conductive state. Different modes can be operated according to environmental conditions, which is beneficial for maximizing energy utilization.

[0020] In some embodiments, the heat exchange pipeline is provided with a fifth valve, a sixth valve, and a second water pump. The fifth valve and the second water pump are connected in the direction from the heat exchange device to the inlet of the first evaporator, and the sixth valve is connected in the direction from the outlet of the first evaporator to the heat exchange device.

[0021] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For users of ordinary skills in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an indirect evaporative chiller unit with waste heat recovery disclosed in an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the operation of a hybrid refrigeration mode of an indirect evaporative chiller with waste heat recovery disclosed in an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the natural cooling source mode of an indirect evaporative chiller unit with waste heat recovery disclosed in the embodiments of this application.

[0026] Figure 4 This is a schematic diagram of the total heat recovery mode of an indirect evaporative chiller with waste heat recovery disclosed in an embodiment of this application.

[0027] Figure 5 This is a schematic diagram of the partial heat recovery mode of an indirect evaporative chiller with waste heat recovery disclosed in an embodiment of this application.

[0028] Figure 6 This is a schematic diagram of the working mode of a refrigeration + heat recovery in an indirect evaporative chiller with waste heat recovery disclosed in an embodiment of this application.

[0029] Figure Labels

[0030] 10. Water source heat pump system; 11. First evaporator; 12. Fifth valve; 13. Second water pump; 14. Sixth valve; 15. Third expansion valve; 16. Third compressor; 17. Third condenser; 20. Indirect evaporative cooling system; 21. First condenser; 22. Fan; 23. Heat exchanger; 231. Cooling tower; 232. Surface cooler; 233. Second evaporator; 234. First valve; 235. Second valve; 236. Third valve; 237. Electric multi-way valve; 238. First water pump; 239. Fourth valve; 240. Seventh valve; 241. Eighth valve; 242. Ninth valve; 243. First compressor; 244. Second compressor; 245. First expansion valve; 246. Second expansion valve; 25. Connecting pipeline; 251. Tenth valve; 252. Eleventh valve; 26. Bypass vent valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by users of ordinary skill in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal conduction of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Example

[0038] With the development of technology, the demand for networks is increasing. The storage, computing, and transmission of network information data require the support of data centers. Data centers house a large number of servers and supporting facilities. In order to prevent equipment from crashing due to excessive internal temperature, data centers also need to be equipped with heat dissipation systems.

[0039] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an indirect evaporative chiller unit with waste heat recovery disclosed in an embodiment of this application. In a first aspect, this application provides an indirect evaporative chiller unit with waste heat recovery. The indirect evaporative chiller unit with waste heat recovery can be used for heat exchange with a machine room, and the heat exchanged by the indirect evaporative chiller unit with waste heat recovery can be used to produce hot water. The indirect evaporative chiller unit with waste heat recovery includes: a water source heat pump system 10 and an indirect evaporative chiller system 20. The water source heat pump system 10 is connected to the indirect evaporative chiller system 20. The indirect evaporative chiller system 20 exchanges heat with the machine room, and the water source heat pump system 10 exchanges heat with the indirect evaporative chiller system 20, so that the heat exchanged by both the indirect evaporative chiller system 20 and the water source heat pump system 10 can be used to produce heating hot water or domestic hot water, etc.

[0040] Specifically, the water source heat pump system 10 has a first evaporator 11 and a circulating heat pump subsystem connected to the first evaporator 11, so that the circulating heat pump subsystem provides heat after exchanging heat with the first evaporator 11; the indirect evaporative cooling system 20 has a first condenser 21, a heat exchange device 23 and a fan 22. The heat exchange device 23 is connected to the first condenser 21 and the first evaporator 11. The heat exchange device 23 exchanges heat with the indoor air and delivers air through the fan 22, so that in the first mode, the heat exchange device 23 is connected to the first condenser 21, and in the second mode, the heat exchange device 23 is connected to the first evaporator 11.

[0041] For example, the circulating heat pump subsystem includes a third expansion valve 15, a third compressor 16, and a third condenser 17. The conduction direction of the third expansion valve 15 is from the outlet of the third condenser 17 to the inlet of the first evaporator 11, and the conduction direction of the third compressor 16 is from the outlet of the first evaporator 11 to the inlet of the third condenser 17, so that after the third condenser 17 exchanges heat with the first evaporator 11, it can be used to produce hot water, etc.

[0042] It should be noted that the indoor area includes, but is not limited to, the computer room. The first mode may include multiple modes, such as a hybrid cooling mode (i.e., natural cold source + mechanical cooling), a natural cold source mode, and a heat recovery mode (cooling + heat recovery). The second mode may also include multiple modes, such as a total heat recovery mode and a partial heat recovery mode. The first mode and the second mode can be switched according to factors such as ambient temperature.

[0043] In the above implementation process, the first evaporator 11 is connected to the circulating heat pump subsystem and the heat exchange device 23 respectively. The indirect evaporative cooling system 20 includes a first condenser 21 and a heat exchange device 23 connected to each other for heat exchange with the room. In the first mode, only the indirect evaporative cooling system 20 is operated. In the second mode, the heat generated by the heat exchange device 23 during heat exchange with the room is used to exchange heat with the first evaporator 11, so that the water source heat pump system 10 can work and provide heat. It can fully recover the heat in the room, thereby greatly improving the energy efficiency of the overall device.

[0044] Please refer to again Figure 1 The heat exchange device 23 includes a cooling tower 231, a surface cooler 232, a second evaporator 233, a circulation pipeline, and a refrigeration pipeline. The cooling tower 231 is connected to the surface cooler 232 through the circulation pipeline, and the second evaporator 233 is connected to the first condenser 21 through the refrigeration pipeline. The surface cooler 232 and the second evaporator 233 are arranged sequentially along the air delivery direction of the fan 22, and the first condenser 21 is connected to the circulation pipeline.

[0045] For example, the cooling tower 231 includes, but is not limited to, an open (closed) cooling tower 231, the second evaporator 233 includes, but is not limited to, a finned evaporator, the circulation pipeline enables heat exchange between the cooling tower 231 and the surface cooler 232, the refrigeration pipeline enables heat exchange between the second evaporator 233 and the first condenser 21, and the surface cooler 232 and the second evaporator 233 can be mounted on the same sheet metal, and the surface cooler 232 and the second evaporator 233 can be used to exchange heat with the indoor air.

[0046] In the above process, the cooling tower 231 is connected to the surface cooler 232 through the circulation pipeline, the second evaporator 233 is connected to the first condenser 21 through the refrigeration pipeline, and the first condenser 21 is connected to the circulation pipeline. This allows for full utilization of natural resources and mechanical refrigeration, enabling different operating modes. This allows the cooling tower 231 and the first condenser 21 to exchange heat with the surface cooler 232, and the second evaporator 233 to exchange heat with the first condenser 21, thereby achieving heat exchange of indoor air, greatly reducing the overall energy consumption of the device and improving the overall energy efficiency.

[0047] In some embodiments, the circulation pipeline includes a first circulation branch and a second circulation branch. The first circulation branch is connected between the inlet of the cooling tower 231 and the outlet of the surface cooler 232, and the second circulation branch is connected between the outlet of the cooling tower 231 and the inlet of the surface cooler 232. At least a portion of the structure of the first circulation branch is connected to the second circulation branch.

[0048] In the above implementation process, the first circulation branch and the second circulation branch are connected at different positions, which can realize the connection between the cooling tower 231 and the surface cooler 232, and can selectively utilize natural resources according to different modes, which is conducive to reducing the energy consumption of the overall device.

[0049] In some embodiments, the first circulation branch is provided with a first valve 234, a second valve 235, a third valve 236 and an electric multi-way valve 237. The first valve 234 is connected between the second valve 235 and the outlet of the surface cooler 232. The second valve 235 is connected to the first condenser 21 and the second circulation branch respectively. One end of the third valve 236 is connected between the first valve 234 and the second valve 235. The other end of the third valve 236 is connected to the inlet of the cooling tower 231 through the electric multi-way valve 237.

[0050] For example, an eighth valve 241 is provided on the pipeline connecting the second valve 235 and the first condenser 21. The first condenser 21 is connected to the pipeline between the third valve 236 and the electric multi-way valve 237 through a ninth valve 242. The conduction direction of the eighth valve 241 is from the second valve 235 to the first condenser 21, and the conduction direction of the ninth valve 242 is from the first condenser 21 to the pipeline between the third valve 236 and the electric multi-way valve 237. The electric multi-way valve 237 includes, but is not limited to, an electric three-way valve.

[0051] In the above implementation process, one end of the second valve 235 is connected to the first valve 234, and the other end is connected to the first condenser 21 and the second circulation branch respectively. The third valve 236 is connected between the first valve 234 and the second valve 235, so that by switching the conduction of the second valve 235 and the third valve 236, different modes can be realized according to different working environments, improving the adaptability of the overall device and also helping to reduce the energy consumption of the overall device.

[0052] In some embodiments, a first water pump 238 and a fourth valve 239 are provided on the second circulation branch. The second valve 235 is connected between the first water pump 238 and the fourth valve 239. A seventh valve 240 is provided on the pipeline between the second valve 235 and the first water pump 238 and the fourth valve 239. The seventh valve 240 can be used to control the opening and closing of the pipeline, which is beneficial to the heat exchange between the cooling tower 231 and the surface cooler 232 and improves the heat exchange efficiency.

[0053] In some embodiments, the refrigeration pipeline includes a first refrigeration sub-pipeline and a second refrigeration sub-pipeline, wherein the first refrigeration sub-pipeline and the second refrigeration sub-pipeline are connected in parallel to achieve mechanical refrigeration and complete the switching for different environments.

[0054] In some embodiments, the first refrigeration sub-pipeline has a first compressor 243 and a first expansion valve 245, the first compressor 243 is directed from the outlet of the second evaporator 233 to the inlet of the first condenser 21, and the first expansion valve 245 is directed from the outlet of the first condenser 21 to the inlet of the second evaporator 233.

[0055] The second refrigeration sub-pipeline has a second compressor 244 and a second expansion valve 246. The conduction direction of the second compressor 244 is from the outlet of the second evaporator 233 to the inlet of the first condenser 21, and the conduction direction of the second expansion valve 246 is from the outlet of the first condenser 21 to the inlet of the second evaporator 233.

[0056] In some embodiments, the indirect evaporative cooling system 20 further includes a connecting pipe 25, which is configured to connect to the inlet and outlet of the first condenser 21 respectively. The connecting pipe 25 is provided with a tenth valve 251 and an eleventh valve 252 for controlling the on / off state of the connecting pipe 25. The connecting pipe 25 can be used for heating hot water or domestic hot water, and can achieve heat exchange with the first condenser 21 through the connection of the connecting pipe 25, thereby providing high-temperature hot water, which is beneficial for recovering indoor heat and cooling the room at the same time, ensuring full utilization of energy.

[0057] In some embodiments, the first evaporator 11 is connected to the heat exchange device 23 via a heat exchange pipeline. In the first mode, the heat exchange pipeline is in a closed state, and in the second mode, the heat exchange pipeline is in a conducting state. Different modes can be operated according to environmental conditions, which is beneficial to maximizing energy utilization.

[0058] For example, the indirect evaporative cooling system 20 also includes a bypass vent valve 26. The bypass vent valve 26, the surface cooler 232, and the second evaporator 233 are connected to the same sheet metal so that when the indirect evaporative cooling unit with waste heat recovery is operating in the first mode of refrigeration + heat recovery mode, the bypass vent valve 26 is opened, and some of the high-temperature indoor return air does not pass through the surface cooler 232, reducing wind resistance and reducing the energy consumption of the fan 22. At the same time, the low-temperature hot water is transformed into high-temperature hot water after absorbing heat through the first condenser 21.

[0059] In some embodiments, the heat exchange pipeline is provided with a fifth valve 12, a sixth valve 14 and a second water pump 13. The conduction direction of the fifth valve 12 and the second water pump 13 is from the heat exchange device 23 to the inlet of the first evaporator 11, and the conduction direction of the sixth valve 14 is from the outlet of the first evaporator 11 to the heat exchange device 23.

[0060] like Figure 2 As shown, Figure 2 This is a schematic diagram of the operation of a hybrid refrigeration mode of an indirect evaporative cooling unit with waste heat recovery disclosed in this application embodiment. Specifically, the hybrid refrigeration mode is as follows: the connecting pipe 25, the third valve 236, the fifth valve 12, the sixth valve 14, and the seventh valve 240 are all closed; the first valve 234, the second valve 235, the fourth valve 239, the eighth valve 241, and the ninth valve 242 are open; the electric three-way valve is in direct flow. At this time, the high-temperature cooling water from the first condenser 21 passes through the ninth valve 242 and the electric multi-way valve 237 to the open (closed) cooling tower 231, becoming low-temperature cooling water. The low-temperature cooling water is pressurized by the first water pump 238 and passes sequentially through the fourth valve 239 and the surface cooler 232. The surface cooler 232 heats it to medium-temperature cooling water. The medium-temperature cooling water passes through the first valve 234, the second valve 235, and the eighth valve 241 to the first condenser 21, becoming high-temperature cooling water, thus completing one cycle. At this time, the high-temperature return air from the computer room is transformed into medium-temperature supply air through the surface cooler 232. The medium-temperature supply air then passes through the second heat exchanger of mechanical refrigeration and is transformed into low-temperature supply air, which is then sent to the computer room. At this time, the first condenser 21, the first compressor 243, the first expansion valve 245 and the second evaporator 233 form a refrigeration system.

[0061] like Figure 3 As shown, Figure 3This is a schematic diagram of the operation of a natural cooling source mode for an indirect evaporative chiller unit with waste heat recovery disclosed in this application embodiment; specifically, in the natural cooling source mode: the connecting pipe 25, the third valve 236, the fifth valve 12, the sixth valve 14, and the seventh valve 240 are closed; the eighth valve 241, the ninth valve 242, the first valve 234, the second valve 235, and the fourth valve 239 are open; the electric multi-way valve 237 is in a straight-through state; at this time, the high-temperature condenser output from the first condenser 21... Warm cooling water, after passing through the ninth valve 242 and the electric multi-way valve 237, becomes low-temperature cooling water in the open (closed) cooling tower 231. The low-temperature cooling water is pressurized by the first water pump 238 and sequentially passes through the fourth valve 239 to the surface cooler 232. The surface cooler 232 heats it to high-temperature cooling water. The high-temperature cooling water then passes through the first valve 234, the second valve 235, the eighth valve 241, and the first condenser 21 to the open (closed) cooling tower 231, thus completing one cycle. At this time, the high-temperature return air from the machine room is directly converted into low-temperature supply air through the first surface cooler 232. During this period, the first condenser 21, the first compressor 243, the second compressor 244, the first expansion valve 245, the second expansion valve 246, the second evaporator 233, and the water source heat pump system 10 are not operating.

[0062] like Figure 4 As shown, Figure 4 This is a schematic diagram of the operation of a total heat recovery mode of an indirect evaporative chiller unit with waste heat recovery disclosed in this application embodiment. Specifically, the total heat recovery mode is as follows: the eighth valve 241, the ninth valve 242, the third valve 236, and the first valve 234 are closed; the fifth valve 12, the sixth valve 14, the second valve 235, the seventh valve 240, and the fourth valve 239 are open; and the electric multi-way valve 237 is closed. At this time, the high-temperature cooling water from the first surface cooler 232 passes through the fifth valve 12 and the second water pump 13 to the first evaporator 11 of the water source heat pump system 10, where it releases heat and becomes low-temperature cooling water. This low-temperature cooling water then passes through the sixth valve 14, the second valve 235, the seventh valve 240, and the fourth valve 239 to the surface cooler 232, where it is heated to high-temperature cooling water, thus completing one cycle. Meanwhile, the high-temperature return air from the machine room is directly converted into low-temperature supply air through the surface cooler 232. The water source heat pump system 10 completes a mechanical refrigeration cycle to produce high-temperature hot water, fully utilizing the heat from the machine room and improving the energy consumption of the water source heat pump. At this time, the first condenser 21, the first compressor 243, the second compressor 244, the first expansion valve 245, the second expansion valve 246, the second evaporator 233, and the open (closed) cooling tower 231 are not working.

[0063] like Figure 5 As shown, Figure 5This is a schematic diagram of the partial heat recovery mode of an indirect evaporative chiller unit with waste heat recovery disclosed in this application embodiment. The partial heat recovery mode is as follows: the eighth valve 241, the ninth valve 242, the second valve 235, the first valve 234 and the seventh valve 240 are closed, the fifth valve 12, the sixth valve 14, the third valve 236 and the fourth valve 239 are open, and the electric multi-way valve 237 is in direct flow. At this time, the high-temperature cooling water from the surface cooler 232 passes through the fifth valve 12 and the second water pump 13 to the first evaporator 11 of the water source heat pump system 10 to release heat and become medium-temperature cooling water. The medium-temperature cooling water passes through the sixth valve 14, the third valve 236 and the electric multi-way valve 237 to the open (closed) cooling tower 231 to be cooled to low-temperature cooling water. The low-temperature cooling water passes through the first water pump 238 and the fourth valve 239 to the surface cooler 232 to be heated to high-temperature cooling water, thus completing one cycle. At this time, the high-temperature return air from the computer room is directly converted into low-temperature supply air through the surface cooler 232. The water source heat pump system 10 completes the mechanical refrigeration cycle to produce high-temperature hot water, utilizing part of the computer room heat to improve the energy consumption of the water source heat pump. At this time, the first condenser 21, the first compressor 243, the second compressor 244, the first expansion valve 245, the second expansion valve 246, and the second evaporator 233 are not working.

[0064] like Figure 6 As shown, Figure 6 This is a schematic diagram of the operation of a refrigeration + heat recovery mode of an indirect evaporative chiller unit with waste heat recovery disclosed in this application embodiment. Specifically, the refrigeration + heat recovery mode is as follows: the eighth valve 241 and the ninth valve 242 are closed, the connecting pipe 25 is opened, and high-temperature, high-pressure gaseous refrigerant is discharged from the first compressor 243, condensed into a high-pressure, high-temperature liquid by the first condenser 21, and then becomes a low-temperature, low-pressure liquid refrigerant by the first expansion valve 245. The low-temperature, low-pressure liquid refrigerant absorbs heat through evaporation in the second evaporator 233 and becomes a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant returns to the compressor 11 suction port to complete the mechanical refrigeration cycle. The high-temperature return air from the machine room is converted into low-temperature supply air by the heat released by the second evaporator 233 and sent to the machine room. At this time, the bypass ventilation valve 26 is opened, and some of the high-temperature return air from the machine room bypasses the surface cooler 232, reducing wind resistance and lowering the energy consumption of the fan 22. Simultaneously, the low-temperature hot water absorbs heat through the first condenser 21 and becomes high-temperature hot water.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An indirect evaporative chiller unit with waste heat recovery, characterized in that, include: A water source heat pump system has a first evaporator and a circulating heat pump subsystem connected to the first evaporator, so that the circulating heat pump subsystem provides heat after exchanging heat with the first evaporator; An indirect evaporative cooling system includes a first condenser, a heat exchange device, and a fan. The heat exchange device is connected to the first condenser and the first evaporator. The heat exchange device exchanges heat with the indoor air and delivers air through the fan. In a first mode, the heat exchange device is connected to the first condenser, and in a second mode, the heat exchange device is connected to the first evaporator. The heat exchange device includes a cooling tower, a surface cooler, a second evaporator, a circulation pipeline, and a refrigeration pipeline. The cooling tower is connected to the surface cooler through the circulation pipeline, and the second evaporator is connected to the first condenser through the refrigeration pipeline. The surface cooler and the second evaporator are arranged sequentially along the air delivery direction of the fan, and the first condenser is connected to the circulation pipeline. The circulation pipeline includes a first circulation branch and a second circulation branch. The first circulation branch is connected between the inlet of the cooling tower and the outlet of the surface cooler, and the second circulation branch is connected between the outlet of the cooling tower and the inlet of the surface cooler. At least a portion of the structure of the first circulation branch is connected to the second circulation branch. The first circulation branch is equipped with a first valve, a second valve, a third valve, and an electric multi-way valve. The first valve is connected between the second valve and the outlet of the surface cooler. The second valve is connected to the first condenser and the second circulation branch respectively. One end of the third valve is connected between the first valve and the second valve, and the other end of the third valve is connected to the inlet of the cooling tower through the electric multi-way valve. The indirect evaporative cooling system also includes connecting pipes configured to connect to the inlet and outlet of the first condenser, respectively.

2. The indirect evaporative chiller unit with waste heat recovery according to claim 1, characterized in that, The second circulation branch is equipped with a first water pump and a fourth valve, with the second valve connected between the first water pump and the fourth valve.

3. The indirect evaporative chiller unit with waste heat recovery according to claim 1, characterized in that, The refrigeration piping includes a first refrigeration sub-pipeline and a second refrigeration sub-pipeline, wherein the first refrigeration sub-pipeline and the second refrigeration sub-pipeline are connected in parallel.

4. The indirect evaporative chiller unit with waste heat recovery according to claim 3, characterized in that, The first refrigeration sub-pipeline has a first compressor and a first expansion valve. The first compressor is open from the outlet of the second evaporator to the inlet of the first condenser, and the first expansion valve is open from the outlet of the first condenser to the inlet of the second evaporator. The second refrigeration sub-pipeline has a second compressor and a second expansion valve. The second compressor is directed from the outlet of the second evaporator to the inlet of the first condenser, and the second expansion valve is directed from the outlet of the first condenser to the inlet of the second evaporator.

5. The indirect evaporative chiller unit with waste heat recovery according to claim 1, characterized in that, The first evaporator is connected to the heat exchange device through a heat exchange pipeline. In the first mode, the heat exchange pipeline is in a closed state, and in the second mode, the heat exchange pipeline is in a conductive state.

6. The indirect evaporative chiller unit with waste heat recovery according to claim 5, characterized in that, The heat exchange pipeline is equipped with a fifth valve, a sixth valve, and a second water pump. The fifth valve and the second water pump are connected in the direction from the heat exchange device to the inlet of the first evaporator, and the sixth valve is connected in the direction from the outlet of the first evaporator to the heat exchange device.

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