Waste heat recovery system

Abstract

The utility model discloses a waste heat recovery system. The waste heat recovery system comprises an indirect evaporative cooling unit and a heat recovery assembly, the indirect evaporative cooling unit comprises an air-air heat exchanger and a liquid cooling assembly which are arranged in a to-be-cooled chamber, and an evaporator coil of the liquid cooling assembly is adjacent to the air-air heat exchanger; the heat recovery assembly comprises a heat recovery coil pipe, a recovery water circulating pump, a heat recovery water supply pipe and a heat recovery water return pipe, the heat recovery coil pipe is arranged indoors and can exchange heat with the condenser coil pipe, one end of the heat recovery water supply pipe is communicated with the water inlet end of the heat recovery coil pipe, and one end of the heat recovery water return pipe is connected with the water outlet end of the heat recovery coil pipe; the recycled water circulating pump is used for providing power for flowing of water in the heat recycling water supply pipe, the heat recycling coil pipe and the heat recycling water return pipe. According to the waste heat recovery system, heat in the indirect evaporative cooling unit can be recycled, the temperature of water in the heat recovery coil pipe is increased through the recycled heat, and waste of the heat is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery in data centers, and in particular to a waste heat recovery system. Background Art

[0002] Indirect evaporative cooling technology is an indirect air-to-air heat exchange technology that has been widely used in the field of data centers. The application of indirect evaporative cooling technology has greatly reduced the energy consumption and water resource consumption of data centers. However, the large-scale application of existing indirect evaporative cooling units causes the heat dissipation of data centers to be discharged to the outdoor environment in the form of waste heat, which not only fails to achieve energy cascade utilization, but also wastes a lot of heat. Utility Model Content

[0003] The utility model aims to provide a waste heat recovery system, which can recycle the heat in an indirect evaporative cooling unit and use the recovered heat to heat up the water in a heat recovery coil, thereby avoiding heat waste.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A waste heat recovery system comprises: an indirect evaporative cooling unit, the indirect evaporative cooling unit comprises an air-to-air heat exchanger and a liquid cooling component arranged in a room to be radiated, the air-to-air heat exchanger is used to realize heat exchange between outdoor fresh air and indoor air, the liquid cooling component comprises a condenser coil and an evaporator coil, the evaporator coil is arranged adjacent to the air-to-air heat exchanger and is used to cool the indoor air; a heat recovery component, the heat recovery component comprises a heat recovery coil, a recovery water circulation pump, a heat recovery water supply pipe and a heat recovery water return pipe, the heat recovery coil is arranged indoors and can exchange heat with the condenser coil, one end of the heat recovery water supply pipe is connected to the water inlet end of the heat recovery coil, one end of the heat recovery water return pipe is connected to the water outlet end of the heat recovery coil, and the recovery water circulation pump is used to provide power for the flow of water in the heat recovery water supply pipe, the heat recovery coil and the heat recovery water return pipe.

[0006] Preferably, the heat recovery component also includes a heat pump unit, a hot water supply pipe and a hot water recovery pipe, the first port of the heat pump unit is connected to the heat recovery supply pipe, the second port of the heat pump unit is connected to the heat recovery return pipe, the third port of the heat pump unit is connected to one end of the hot water supply pipe, the fourth port of the heat pump unit is connected to one end of the hot water recovery pipe, a hot water circulation pump is provided on the hot water recovery pipe, and the other end of the hot water supply pipe and the other end of the hot water recovery pipe are used for external hot water equipment.

[0007] Preferably, the indirect evaporative cooling units are provided with at least two groups, and the heat recovery coil, the heat recovery water supply pipe and the heat recovery return water pipe are each provided in plurality and are arranged in one-to-one correspondence with at least two groups of the indirect evaporative cooling units; the heat recovery component also includes a water supply loop pipe and a return water loop pipe, the other ends of the plurality of heat recovery water supply pipes are connected to the water supply loop pipe, and the other ends of the plurality of heat recovery return water pipes are connected to the return water loop pipe.

[0008] Preferably, the waste heat recovery system also includes a heat pump unit, a first port of the heat pump unit is connected to the water supply loop through a first pipeline, a second port of the heat pump unit is connected to the return loop through a second pipeline, and the first pipeline is provided with the recovery water circulation pump.

[0009] Preferably, the indirect evaporative cooling unit also includes an exhaust fan and a supply fan, and an air inlet duct for outdoor fresh air to enter and exit and an air supply duct for indoor air flow are formed in the room to be dissipated. The exhaust fan is arranged in the air inlet duct, the supply fan is arranged in the air supply duct, and the air-to-air heat exchanger is arranged at the intersection of the air inlet duct and the air supply duct.

[0010] Preferably, the heat chamber to be dissipated is formed with multiple air inlets and multiple air outlets to form multiple air inlet channels; the air-to-air heat exchangers are provided in plurality, and the intersections of the air inlet channels and the air supply channels are provided in one-to-one correspondence.

[0011] Preferably, the heat dissipation chamber is formed with an air inlet, and the indirect evaporative cooling unit further comprises a filter, and the filter is arranged at the air inlet.

[0012] Preferably, the heat dissipation chamber is formed with an air outlet, and the condenser coil and the heat recovery coil are both arranged at the air outlet.

[0013] Preferably, the indirect evaporative cooling unit further comprises a water spray assembly, and the water spray assembly is used to cool the indoor air.

[0014] Preferably, the water spray assembly includes a spray water pump, a spray pipeline and a spray head, the spray head is arranged toward the air-to-air heat exchanger, the spray pipeline is connected to the spray head, and the spray water pump is arranged on the spray pipeline.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a waste heat recovery system, which includes an indirect evaporative cooling unit and a heat recovery component. The indirect evaporative cooling unit includes an air-to-air heat exchanger and a liquid cooling component arranged in a room to be radiated. The air-to-air heat exchanger is used to realize heat exchange between outdoor fresh air and indoor air. The liquid cooling component includes a condenser coil and an evaporator coil. The evaporator coil is arranged adjacent to the air-to-air heat exchanger and is used to cool the indoor air. The heat recovery component includes a heat recovery coil, a recovery water circulation pump, a heat recovery water supply pipe and a heat recovery water return pipe. The heat recovery coil is arranged indoors and can exchange heat with the condenser coil. One end of the heat recovery water supply pipe is connected to the water inlet end of the heat recovery coil, and one end of the heat recovery water return pipe is connected to the water outlet end of the heat recovery coil. The recovery water circulation pump is used to provide power for the flow of water in the heat recovery water supply pipe, the heat recovery coil and the heat recovery water return pipe. The waste heat recovery system can recycle the heat in the indirect evaporative cooling unit, and use the recovered heat to heat up the water in the heat recovery coil, thereby avoiding heat waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of a waste heat recovery system provided in an embodiment of the utility model.

[0019] In the figure:

[0020] 100. Indirect evaporative cooling unit; 101. Air-to-air heat exchanger; 102. Condenser coil; 103. Evaporator coil; 104. Exhaust fan; 105. Supply fan; 106. Filter; 107. Spray water pump; 108. Spray head; 109. Compressor; 110. Heat recovery water inlet pipe; 111. Heat recovery water outlet pipe;

[0021] 200, heat recovery component; 201, heat recovery coil; 202, recovery water circulation pump; 203, heat recovery water supply pipe; 203, heat recovery return pipe; 205, heat pump unit; 206, hot water supply pipe; 207, hot water recovery pipe; 208, hot water circulation pump; 209, water supply loop pipe; 210, return loop pipe; 211, first pipeline; 212, second pipeline. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The utility model provides a waste heat recovery system, which can be used in a data center to achieve heat dissipation and waste heat recovery in the data center. Of course, in addition to being used in a data center, the waste heat recovery system can also be used in other places where heat dissipation and waste heat recovery are required.

[0026] Reference below Figure 1 and Figure 2 The specific structure of the waste heat recovery system of the embodiment of the utility model is described. Figure 1 and Figure 2 As shown, the waste heat recovery system includes an indirect evaporative cooling unit 100 and a heat recovery component 200. The indirect evaporative cooling unit 100 is an air cooler that uses the evaporation principle of water to cool the air, and the produced cold air is not in direct contact with water. The heat recovery component 200 realizes heat recovery. The heat recovery recycles low-grade energy in a certain way and reuses it as a heat source for users.

[0027] Specifically, Figure 1As shown, the indirect evaporative cooling unit 100 includes an air-to-air heat exchanger 101 arranged in the room to be cooled. The room to be cooled is a place where the temperature needs to be lowered. The room to be cooled is formed with an air inlet and an air outlet. The room to be cooled is formed with an air inlet flow channel for outdoor fresh air to enter and exit. The outdoor fresh air enters the air inlet flow channel from the air inlet, and flows out of the room to be cooled through the air outlet after completing heat exchange with the indoor air. The room to be cooled is also formed with an air supply flow channel for indoor air to flow. The temperature of the outdoor fresh air is relatively low, and the operating temperature of the indoor air is relatively high due to the heating equipment. The air-to-air heat exchanger 101 is arranged at the intersection of the air inlet flow channel and the air supply flow channel, so as to realize the heat exchange between the outdoor fresh air and the indoor air, so as to reduce the temperature of the indoor space.

[0028] Continue to refer to Figure 1 As shown, in some embodiments, the indirect evaporative cooling unit 100 also includes an exhaust fan 104 and a supply fan 105. The exhaust fan 104 is arranged in the air inlet channel, and the exhaust fan 104 provides power for outdoor fresh air to enter the air inlet channel. The supply fan 105 is arranged in the air supply channel, and the supply fan 105 provides power for the flow of indoor air.

[0029] In some embodiments, the heat dissipation chamber is formed with multiple air inlets and multiple air outlets, thereby forming multiple air inlet channels. The air-to-air heat exchanger 101 is provided with multiple air inlet channels and the intersections of the air inlet channels and the air supply channels are provided one by one. Figure 1 As shown, the heat dissipation chamber is provided with two air inlets and two air outlets, wherein the two air inlets are respectively provided on the left and right sides of the heat dissipation chamber, and the two air outlets are simultaneously provided on the top of the heat dissipation chamber and are spaced apart on the top of the heat dissipation chamber, thereby forming a Figure 1 The two air inlet channels shown in the figure may be partially overlapped and shared. Correspondingly, two air supply channels are formed in the heat dissipation chamber, and the two air supply channels are in a "Y" shape. Two air-to-air heat exchangers 101 are also arranged in the heat dissipation chamber, and the two air-to-air heat exchangers 101 are respectively arranged at the intersection of the two air inlet channels and the two air supply channels.

[0030] Optionally, in order to prevent foreign matter from entering the heat dissipation room with the outdoor fresh air, thereby affecting the normal operation of the components in the heat dissipation room, in some embodiments, the indirect evaporative cooling unit 100 further includes a filter 106, which is arranged at the air inlet. Figure 1 As shown, two filters 106 are provided, and the two filters 106 are respectively provided at two air inlets. Optionally, the filter 106 is provided inside the air inlet. Of course, the filter 106 is also provided on the inner side of the air inlet or on the outer side of the air inlet.

[0031] Continue to refer to Figure 1As shown, the indirect evaporative cooling unit 100 includes a liquid cooling component arranged in the room to be cooled, and the liquid cooling component is used to cool the indoor air. Optionally, the liquid cooling component is a fluorine-containing system. Specifically, the liquid cooling component includes a compressor 109, a condenser and an evaporator. The compressor 109, the condenser and the evaporator are connected by pipelines to form a loop for the flow of refrigerant, wherein the condenser includes a condenser coil 102, and the evaporator includes an evaporator coil 103. The evaporator coil 103 is arranged adjacent to the air-to-air heat exchanger 101 and is used to cool the indoor air. The condenser coil 102 can exchange heat with the heat recovery component 200, thereby realizing the recovery and utilization of waste heat.

[0032] In some embodiments, continue to refer to Figure 1 As shown, the compressor 109 is arranged at the bottom side of the heat dissipation chamber, and the condenser coil 102 is arranged at the top of the heat dissipation chamber and close to the air outlet. In a specific embodiment, the condenser coil 102 is arranged just above the heat recovery coil 201.

[0033] Continue to refer to Figure 1 As shown, in some embodiments, the indirect evaporative cooling unit 100 further includes a water spray assembly, which is used to cool the indoor air.

[0034] In some embodiments, the water spray assembly includes a spray water pump 107, a spray pipeline and a spray head 108, the spray head 108 is arranged toward the air-to-air heat exchanger 101, the spray pipeline is connected to the spray head 108, and the spray water pump 107 is arranged on the spray pipeline.

[0035] In a specific embodiment, continue to refer to Figure 1 As shown, two groups of spray heads 108 are provided, and the two groups of spray heads 108 are respectively provided at two air-to-air heat exchangers 101 to spray water on the air-to-air heat exchangers 101 .

[0036] like Figure 2 As shown, the heat recovery assembly 200 includes a heat recovery coil 201, a recovery water circulation pump 202, a heat recovery water supply pipe 203 and a heat recovery water return pipe 204. The heat recovery coil 201 is arranged indoors and can exchange heat with the condenser coil 102, such as Figure 1As shown, the heat recovery coil 201 and the condenser coil 102 are arranged adjacent to each other. One end of the heat recovery water supply pipe 203 is connected to the water inlet end of the heat recovery coil 201, and one end of the heat recovery return water pipe 204 is connected to the water outlet end of the heat recovery coil 201. The recovery water circulation pump 202 is used to provide power for the flow of water in the heat recovery water supply pipe 203, the heat recovery coil 201 and the heat recovery return water pipe 204. It should be noted that the other end of the heat recovery water supply pipe 203 and the other end of the heat recovery return water pipe 204 can be directly connected to a hot water device. After the heat recovery coil 201 and the condenser coil 102 complete the heat exchange, the water in the condenser coil 102 absorbs heat and heats up, thereby forming warm water for use by the hot water device or users.

[0037] In some embodiments, Figure 1 As shown, the heat dissipation chamber is formed with a heat recovery water inlet pipe 110 and a heat recovery water outlet pipe 111. The heat recovery water inlet pipe 110 is used to connect one end of the heat recovery water supply pipe 203 and the water inlet end of the heat recovery coil 201, and the heat recovery water outlet pipe 111 is used to connect one end of the heat recovery return pipe 204 and the water outlet end of the heat recovery coil 201.

[0038] In some embodiments, continue to refer to Figure 2 As shown, the heat recovery component 200 also includes a heat pump unit 205, a hot water supply pipe 206 and a hot water recovery pipe 207. The first port of the heat pump unit 205 is connected to the heat recovery water supply pipe 203, the second port of the heat pump unit 205 is connected to the heat recovery return pipe 204, the third port of the heat pump unit 205 is connected to one end of the hot water supply pipe 206, and the fourth port of the heat pump unit 205 is connected to one end of the hot water recovery pipe 207. A hot water circulation pump 208 is provided on the hot water recovery pipe 207, and the other end of the hot water supply pipe 206 and the other end of the hot water recovery pipe 207 are used for external hot water equipment. The heat pump unit 205 can be used to further heat the warm water flowing out of the heat recovery coil 201 to form hot water with a higher temperature, so that the formed hot water can meet the requirements of the hot water equipment. It should be noted that the specific structure of the heat pump unit 205 is a prior art and will not be described in detail here.

[0039] In some embodiments, at least two groups of indirect evaporative cooling units 100 are provided, and multiple heat recovery coils 201, heat recovery water supply pipes 203 and heat recovery return water pipes 204 are provided, and are arranged one-to-one corresponding to at least two groups of indirect evaporative cooling units 100; the heat recovery component 200 also includes a water supply loop pipe 209 and a return water loop pipe 210, and the other ends of the multiple heat recovery water supply pipes 203 are connected to the water supply loop pipe 209, and the other ends of the multiple heat recovery return water pipes 204 are connected to the return water loop pipe 210.

[0040] In some embodiments, the first port of the heat pump unit 205 is connected to the water supply loop 209 through the first pipeline 211, the second port of the heat pump unit 205 is connected to the return loop 210 through the second pipeline 212, and a recovery water circulation pump 202 is provided on the first pipeline 211.

[0041] The waste heat recovery system combines the indirect evaporative cooling unit 100 with the heat recovery component 200 to form a set of devices and systems that can continuously and stably recover heat in the data center room. The heat recovery indirect evaporative cooling unit 100 includes a fluorine-containing system, an air-to-air heat exchanger 101, a water spray component, an indoor air supply and return system, an outdoor air intake and exhaust system, and a heat recovery coil 201. The heat recovery coil 201 in the heat recovery indirect evaporative cooling unit 100 absorbs the heat of the indoor air to increase the water temperature in the heat recovery coil 201 to produce medium-temperature water. The water temperature is increased again through the heat pump cycle of the heat pump unit 205 to produce high-temperature water. The temperature of the high-temperature water can reach the range of production and life, completing the heat recovery cycle and avoiding heat waste.

[0042] The indirect evaporative cooling unit 100 has three working modes, which are described below using the data center air supply temperature of 25°C as an example:

[0043] Mode 1: Dry working mode:

[0044] When the outdoor dry-bulb temperature is lower than 18°C ​​(the temperature setting is adjustable), the air-to-air heat exchanger 101 is used to realize indirect heat exchange between indoor return air and outdoor fresh air, and the indoor supply air temperature requirement of 25°C is met. In this mode, only the supply fan 105 and the exhaust fan 104 in the indirect evaporative cooling unit 100 consume power, and other components do not work.

[0045] Mode 2: Wet working mode:

[0046] When the outdoor dry-bulb temperature is higher than 18°C ​​(the temperature setting is adjustable) and the outdoor wet-bulb temperature is lower than 20°C (the temperature setting is adjustable), the outdoor air is cooled by the water spray assembly, and the air-to-air heat exchanger 101 is used to realize indirect heat exchange between indoor return air and outdoor fresh air. The two work together to reduce the indoor supply air temperature to 25°C, meeting the indoor supply air temperature requirement of 25°C. In this mode, only the supply fan 105, the exhaust fan 104 and the spray water pump 107 in the indirect evaporative cooling unit 100 consume electricity.

[0047] Mode 3: Mixed working mode:

[0048] When the outdoor wet-bulb temperature is higher than 20°C (the temperature setting is adjustable), the air-to-air heat exchanger 101 and the water spray assembly alone cannot meet the demand for the indoor air supply temperature to drop to 25°C, and the compressor 109 needs to be turned on to achieve mechanical refrigeration so that the indoor air supply temperature drops to 25°C. In this mode, the air supply fan 105, the exhaust fan 104, the spray water pump 107 and the compressor 109 in the indirect evaporative cooling unit 100 consume electricity.

[0049] It should be noted that, among the above three modes, mode 3 is the mode with the highest energy consumption. The utility model can reduce the opening time of the compressor 109, thereby achieving the purpose of energy saving. At the same time, the hot water generated by heat recovery can realize economic value. Compared with the prior art, the waste heat recovery system provided by the utility model can recover the heat dissipation of the data center, further reduce the energy consumption of the data center, and reduce the mechanical refrigeration time of the indirect evaporative cooling unit 100.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A waste heat recovery system, It is characterized in that include: An indirect evaporative cooling unit (100), the indirect evaporative cooling unit (100) comprising an air-to-air heat exchanger (101) and a liquid cooling component arranged in a room to be cooled, the air-to-air heat exchanger (101) being used to achieve heat exchange between outdoor fresh air and indoor air, the liquid cooling component comprising a condenser coil (102) and an evaporator coil (103), the evaporator coil (103) being arranged adjacent to the air-to-air heat exchanger (101) and being used to cool the indoor air; A heat recovery component (200), the heat recovery component (200) comprising a heat recovery coil (201), a recovery water circulation pump (202), a heat recovery water supply pipe (203) and a heat recovery water return pipe (204); the heat recovery coil (201) is arranged indoors and is capable of performing heat exchange with the condenser coil (102); one end of the heat recovery water supply pipe (203) is connected to the water inlet end of the heat recovery coil (201); one end of the heat recovery water return pipe (204) is connected to the water outlet end of the heat recovery coil (201); the recovery water circulation pump (202) is used to provide power for the flow of water in the heat recovery water supply pipe (203), the heat recovery coil (201) and the heat recovery water return pipe (204).

2. The waste heat recovery system according to claim 1, It is characterized in that The heat recovery component (200) further comprises a heat pump unit (205), a hot water supply pipe (206) and a hot water recovery pipe (207); a first port of the heat pump unit (205) is connected to the heat recovery supply pipe (203); a second port of the heat pump unit (205) is connected to the heat recovery return pipe (204); a third port of the heat pump unit (205) is connected to one end of the hot water supply pipe (206); a fourth port of the heat pump unit (205) is connected to one end of the hot water recovery pipe (207); a hot water circulation pump (208) is provided on the hot water recovery pipe (207); and the other end of the hot water supply pipe (206) and the other end of the hot water recovery pipe (207) are used for externally connecting to hot water equipment.

3. The waste heat recovery system according to claim 1, It is characterized in that The indirect evaporative cooling units (100) are provided with at least two groups, and the heat recovery coil (201), the heat recovery water supply pipe (203) and the heat recovery water return pipe (204) are each provided in plurality and are arranged in one-to-one correspondence with the at least two groups of the indirect evaporative cooling units (100); The heat recovery component (200) further comprises a water supply loop pipe (209) and a water return loop pipe (210); the other ends of the plurality of heat recovery water supply pipes (203) are all connected to the water supply loop pipe (209), and the other ends of the plurality of heat recovery water return pipes (204) are all connected to the water return loop pipe (210).

4. The waste heat recovery system according to claim 3, It is characterized in that The waste heat recovery system further comprises a heat pump unit (205), wherein a first port of the heat pump unit (205) is connected to the water supply loop pipe (209) via a first pipeline (211), a second port of the heat pump unit (205) is connected to the water return loop pipe (210) via a second pipeline (212), and the first pipeline (211) is provided with the recovered water circulation pump (202).

5. The waste heat recovery system according to claim 1, It is characterized in that The indirect evaporative cooling unit (100) further comprises an exhaust fan (104) and a supply fan (105); an air inlet duct for outdoor fresh air to enter and exit and an air supply duct for indoor air to flow are formed in the room to be cooled; the exhaust fan (104) is arranged in the air inlet duct, the supply fan (105) is arranged in the air supply duct, and the air-to-air heat exchanger (101) is arranged at the intersection of the air inlet duct and the air supply duct.

6. The waste heat recovery system according to claim 5, It is characterized in that The heat dissipation chamber is formed with a plurality of air inlets and a plurality of air outlets to form a plurality of air inlet channels; The air-to-air heat exchangers (101) are provided in plurality and are arranged in one-to-one correspondence at the intersections of the air inlet flow channel and the air supply flow channel.

7. The waste heat recovery system according to claim 5, It is characterized in that The heat dissipation chamber is formed with an air inlet, and the indirect evaporative cooling unit (100) further comprises a filter (106), wherein the filter (106) is arranged at the air inlet.

8. The waste heat recovery system according to claim 5, It is characterized in that The heat-dissipating chamber is formed with an air outlet, and the condenser coil (102) and the heat recovery coil (201) are both arranged at the air outlet.

9. The waste heat recovery system according to claim 1, It is characterized in that The indirect evaporative cooling unit (100) further comprises a water spray component, and the water spray component is used to cool the indoor air.

10. The waste heat recovery system according to claim 9, It is characterized in that The water spray assembly comprises a spray water pump (107), a spray pipeline and a spray head (108); the spray head (108) is arranged toward the air-to-air heat exchanger (101); the spray pipeline is connected to the spray head (108); and the spray water pump (107) is arranged on the spray pipeline.

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