Heat recovery system and control method

Abstract

This application provides a heat recovery system and control method. The heat recovery system includes at least an evaporative cooling unit, a heat pump unit, and a heating unit. The evaporative cooling unit includes an indoor passage, an outdoor passage, and a first heat exchanger. The first heat exchanger is used to exchange heat between the air in the indoor passage and the air in the outdoor passage. The heat pump unit includes a second heat exchanger and a third heat exchanger. The second heat exchanger is disposed in the indoor passage and located between the air inlet of the indoor passage and the first heat exchanger. The output end of the second heat exchanger is connected to the input end of the third heat exchanger, and the input end of the second heat exchanger is connected to the output end of the third heat exchanger. The heating unit includes at least one fourth heat exchanger, which is used to exchange heat between the heating fluid and the air in the area to be heated. By integrating the second heat exchanger into the indoor passage, the heat exchange efficiency between the heat recovery system and the air in the data center's server room can be improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a heat recovery system and control method. Background Technology

[0002] A data center is a globally collaborative network of specific devices used to transmit, accelerate, display, compute, and store data information on the Internet infrastructure. Because data centers house various information and communication technology devices, cooling systems are installed to prevent these devices from overheating and damaging the machines. For example, evaporative cooling equipment exchanges heat between outdoor air and the air inside the data center to achieve a cooling effect.

[0003] Since the waste heat generated by data centers can be used as a heat source for heating or domestic hot water in office buildings, residences, and other buildings, related technologies typically employ air-to-air sensible heat exchange or air-to-water sensible heat exchange to deliver the waste heat generated by data centers to the interiors of office buildings, residences, and other buildings to meet heating demands.

[0004] However, the heat recovery system has low heat exchange efficiency with the air in the data center's server room. Summary of the Invention

[0005] This application provides a heat recovery system and control method. The heat recovery system has high heat exchange efficiency with the air in the data center's computer room, which helps improve the utilization rate of waste heat in the data center and enhances the energy efficiency of the heat recovery system.

[0006] A first aspect of this application provides a heat recovery system, comprising at least an evaporative cooling unit, a heat pump unit, and a heating unit. The evaporative cooling unit includes an indoor passage, an outdoor passage, and a first heat exchanger. The first heat exchanger is used to exchange heat between air in the indoor passage and air in the outdoor passage, thereby reducing the temperature of the air in the indoor passage. The heat pump unit includes a second heat exchanger and a third heat exchanger. The second heat exchanger is disposed within the indoor passage and located between the air inlet of the indoor passage and the first heat exchanger. The output end of the second heat exchanger is connected to the input end of the third heat exchanger, and the input end of the second heat exchanger is connected to the output end of the third heat exchanger. The second heat exchanger is used to exchange heat between a liquid refrigerant and the air in the indoor passage, causing a phase change in the refrigerant. The third heat exchanger is used to exchange heat between a gaseous refrigerant and a liquid heating fluid, causing the gaseous refrigerant to condense into a liquid refrigerant. The heating unit includes at least one fourth heat exchanger, which is used to exchange heat between the heating fluid and the air in the area to be heated.

[0007] In this embodiment, the second heat exchanger of the heat pump unit is integrated into the indoor passage, allowing the refrigerant to exchange heat with the air entering the indoor passage. After absorbing heat, the refrigerant undergoes a phase change, changing from a liquid to a gaseous state. Subsequently, the gaseous refrigerant enters the third heat exchanger through the passage between the second and third heat exchangers. The gaseous refrigerant exchanges heat with the heating fluid, causing the gaseous refrigerant to condense into a liquid refrigerant. This also raises the temperature of the heating fluid. Finally, the heated heating fluid exchanges heat with the air in the area to be heated through at least one fourth heat exchanger, thereby raising the temperature of the area to be heated. Therefore, by integrating the second heat exchanger of the heat pump unit into the evaporative cooling unit and absorbing heat from the air entering the evaporative cooling unit using a refrigerant that can undergo a phase change, the cooling efficiency of the evaporative cooling unit can be improved, the heat recovery efficiency of the heat pump unit can be improved, and the heat exchange efficiency between the heat recovery system and the air in the data center's computer room can be improved.

[0008] In one possible implementation, the third heat exchanger is located above the second heat exchanger. This arrangement allows the refrigerant to circulate between the second and third heat exchangers without the need for a compressor.

[0009] In one possible implementation, the system further includes a compressor and an expansion valve. The input end of the second heat exchanger is connected to the output end of the third heat exchanger via the expansion valve, and the output end of the second heat exchanger is connected to the input end of the third heat exchanger via the compressor. The expansion valve reduces throttling pressure and regulates the refrigerant flow rate, ensuring that the refrigerant effectively absorbs heat in the second heat exchanger. The compressor increases the pressure of the gaseous refrigerant, allowing it to move from the second heat exchanger to the third heat exchanger to remove the heat absorbed by the refrigerant. Through the expansion valve and compressor, the heat pump unit can be positioned anywhere, thus expanding the application range of the heat recovery system.

[0010] In one possible implementation, the system further includes a housing and a partition assembly. The housing has a cavity, and the partition assembly and the first heat exchanger are both installed within the cavity. The partition assembly, the first heat exchanger, and the inner wall of the cavity together define a first air inlet cavity, a first air outlet cavity, a second air inlet cavity, and a second air outlet cavity. The first heat exchanger has a first channel and a second channel that are spaced apart from each other. The first air inlet cavity communicates with the air inlet end of the first channel, and the inner wall of the first air inlet cavity has a first air inlet, which serves as the air inlet end of the indoor channel. The first air outlet cavity communicates with the air outlet end of the first channel, and the inner wall of the second air inlet cavity has a first air outlet, which serves as the air outlet end of the indoor channel. The second air inlet cavity communicates with the air inlet end of the second channel, and the inner wall of the second air inlet cavity has a second air inlet, which serves as the air inlet end of the outdoor channel. The second air outlet cavity is connected to the air outlet end of the second channel. A second air outlet is formed on the inner wall of the second air outlet cavity, serving as the air outlet end of the outdoor channel. The second heat exchanger is disposed within the first air inlet cavity. This arrangement allows the air in the indoor channel to exchange heat with the air in the outdoor channel through the first heat exchanger, thereby reducing the temperature of the air in the indoor channel and enabling the delivery of cool air to the data center's server room.

[0011] In one possible implementation, both the first air inlet cavity and the first air outlet cavity are located on the first side of the first heat exchanger. Both the second air inlet cavity and the second air outlet cavity are located on the second side of the first heat exchanger. The first side and the second side of the heat exchanger are arranged opposite each other. This arrangement helps to increase the heat exchange area between the air in the indoor passage and the air in the outdoor passage, thereby improving the heat exchange effect.

[0012] In one possible implementation, the system further includes an indoor fan disposed within the first air outlet cavity and electrically connected to a control device. The indoor fan drives airflow within the indoor passageway, which helps improve heat exchange efficiency.

[0013] In one possible implementation, the system further includes an outdoor fan, which is disposed within the second air outlet cavity and electrically connected to a control device. The outdoor fan drives airflow within the outdoor duct, thus improving heat exchange efficiency.

[0014] In one possible implementation, the system further includes a connecting channel and a switching assembly. The two ends of the connecting channel are respectively connected to the first air inlet cavity and the first air outlet cavity, and the connecting channel allows air from the first air inlet cavity to enter the first air outlet cavity. The switching assembly is electrically connected to a control device and is used to control the opening size of the connecting channel. When the temperature in the machine room and the air temperature in the area to be heated both meet the usage requirements, the switching assembly and the connecting channel can guide the air from the first air inlet cavity into the first air outlet cavity, thereby reducing the amount of air entering through the first channel. This reduces the resistance of the airflow through the first heat exchanger in the indoor channel, helping to improve the energy-saving effect of the evaporative cooling unit.

[0015] In one possible implementation, the switching assembly includes a bypass valve mounted within the connecting channel. Alternatively, the connecting channel is a through-hole in the partition assembly passing through the first air inlet chamber and the first air outlet chamber. The switching assembly includes a power element and a sliding plate slidably connected to the partition assembly. The power element is electrically connected to a control device and drives the sliding plate to move on the partition to change the opening size of the connecting channel. This arrangement allows some air from the first air inlet chamber to enter the first air outlet chamber without passing through the first channel.

[0016] In one possible implementation, it further includes a cooling component disposed at the second air inlet, the cooling component being used to reduce the temperature of the air entering the second air inlet cavity from the second air inlet, thereby helping to absorb more heat from the air in the indoor passage.

[0017] In one possible implementation, the cooling component includes a wet film covering the second air inlet, capable of reducing the temperature of the air entering the second air inlet cavity.

[0018] In one possible implementation, the heating unit further includes a heat exchange tank and a transfer pump. The heat exchange tank contains the heating fluid. The third heat exchanger is disposed within the heat exchange tank and immersed in the heating fluid. The input end of at least one fourth heat exchanger is connected to the heat exchange tank via the transfer pump, and the output end of the at least one fourth heat exchanger is also connected to the heat exchange tank. The transfer pump is used to transfer the heating fluid from the heat exchange tank to the at least one fourth heat exchanger. The transfer pump allows the heating fluid to circulate between the heat exchange tank and the at least one fourth heat exchanger, transferring the heat absorbed by the refrigerant to the area to be heated.

[0019] In one possible implementation, the system further includes a first temperature sensor, a second temperature sensor, and a control device. The first and second temperature sensors are electrically connected to the control device. The first temperature sensor detects the heating temperature of the heating unit. The second temperature sensor detects the supply air temperature at the air outlet of the indoor passage. The control device controls the rotational speed of the outdoor fan based on the heating temperature and the supply air temperature. By linking the outdoor fan with the heating and supply air temperatures, energy savings in the evaporative cooling unit can be achieved, and the energy consumption of the heat recovery system can be reduced.

[0020] A second aspect of this application provides a control method for a heat recovery system, comprising:

[0021] Obtain the heating temperature of the heating unit and the air supply temperature at the outlet of the indoor passage;

[0022] The speed of the outdoor fan is controlled according to the heating temperature and the air supply temperature.

[0023] In one possible implementation, controlling the speed of the outdoor fan based on the heating temperature and the supply air temperature includes:

[0024] If the heating temperature is greater than the first temperature threshold, the current speed of the outdoor fan will be increased to the first speed.

[0025] If the heating temperature is lower than the second temperature threshold, the current speed of the outdoor fan is reduced to the second speed; wherein the second temperature threshold is lower than the first temperature threshold.

[0026] If the heating temperature is within a first preset range and the air supply temperature is within a second preset range, the rotation speed of the outdoor fan will be reduced to 0.

[0027] In one possible implementation, the method further includes controlling the continuity of the connecting flow channel based on the heating temperature and the air supply temperature.

[0028] In one possible implementation, controlling the continuity of the connecting channel based on the heating temperature and the air supply temperature includes:

[0029] If the heating temperature is within a first preset range and the air supply temperature is within a second preset range, the control switch assembly enables the connection channel to be opened. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an air-to-air sensible heat exchange structure in a related technology.

[0031] Figure 2This is a schematic diagram of the structure of air-water sensible heat exchange in related technologies;

[0032] Figure 3 This is a schematic diagram of the structure of the first heat recovery system provided in the embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the structure of a second heat recovery system provided in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the first type of evaporative cooling unit provided in the embodiments of this application;

[0035] Figure 6 This is a schematic diagram of the structure of a second type of evaporative cooling unit provided in an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the structure of an evaporative cooling unit with an indoor fan provided in an embodiment of this application;

[0037] Figure 8 This is a schematic diagram of the structure of an evaporative cooling unit with an outdoor fan provided in an embodiment of this application;

[0038] Figure 9 This is a schematic diagram of the structure of an evaporative cooling unit with an outdoor fan and an indoor fan, provided in an embodiment of this application.

[0039] Figure 10 A schematic diagram of the structure of an evaporative cooling unit with connecting channels and switching components provided in this application embodiment;

[0040] Figure 11 This is a schematic diagram of the structure of a switch assembly provided in an embodiment of this application;

[0041] Figure 12 This is a schematic diagram of another switching assembly provided in an embodiment of this application;

[0042] Figure 13 This is a schematic diagram of the structure of an evaporative cooling unit with cooling components provided in an embodiment of this application;

[0043] Figure 14 This is a schematic diagram of the cooling component provided in an embodiment of this application;

[0044] Figure 15 This is a schematic diagram of the structure of the heating unit provided in the embodiments of this application;

[0045] Figure 16 This is a schematic diagram of the structure of the third heat recovery system provided in the embodiments of this application;

[0046] Figure 17A flowchart of a control method for a heat recovery system provided in an embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10. Heat recovery system;

[0049] 100. Evaporative cooling unit;

[0050] 110. Indoor passageways;

[0051] 120. Outdoor passageway;

[0052] 130. First heat exchanger; 131. First channel; 132. Second channel;

[0053] 140. Housing; 141. First air inlet cavity; 142. First air outlet cavity; 143. Second air inlet cavity; 144. Second air outlet cavity; 145. Connecting flow channel;

[0054] 150. Partition assembly; 151. First partition; 152. Second partition; 153. Third partition; 154. Fourth partition;

[0055] 160. Indoor fan;

[0056] 170. Outdoor fan;

[0057] 180. Switch assembly; 181. Bypass valve; 182. Power component; 183. Slide plate;

[0058] 190. Cooling component; 191. Wet film; 192. Circulating water tank; 193. Water pump; 194. Water distributor;

[0059] 200. Heat pump unit; 210. Second heat exchanger; 220. Third heat exchanger; 230. Compressor; 240. Expansion valve;

[0060] 300. Heating unit; 310. Fourth heat exchanger; 320. Heat exchange box; 330. Transfer pump;

[0061] 400. First temperature sensor;

[0062] 500. Second temperature sensor;

[0063] 600. Air-to-air heat exchanger;

[0064] 700, heat exchange tubes; 800, heating area;

[0065] 20. Computer room. Detailed Implementation

[0066] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0067] To facilitate understanding, the relevant technical terms involved in the embodiments of this application will first be explained and described.

[0068] Waste heat: refers to the usable thermal energy released during the production process. For example, the heat generated by equipment in a data center during operation.

[0069] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid. Either the hot or cold fluid can be in a gaseous or liquid state; no specific restrictions are placed here.

[0070] A data center is a globally collaborative network of specific devices used to transmit, accelerate, display, compute, and store data information on the Internet infrastructure. During the operation of a data center, the heat generated within the server room 20 can be transferred to the outside of the data center through a cooling system to ensure that the temperature inside the server room 20 is within a predetermined range, preventing the information and communication technology equipment inside the server room 20 from being damaged due to excessive temperature.

[0071] Since the waste heat from the computer room 20 can be used as a heat source for heating or domestic hot water in office buildings, residences, and other buildings, in this embodiment, by connecting the heat recovery system 10 to the computer room 20, the heat recovery system 10 can exchange heat with the air inside the computer room 20 to reduce the temperature inside the computer room 20, allowing the equipment inside the computer room 20 to operate normally. In addition, the heat recovery system 10 can use the recovered heat for heating office buildings, residences, and other buildings. It should be noted that the heat recovery system 10 in this embodiment can be applied to any building or room containing equipment that continuously generates heat during operation, such as a high-temperature production workshop. In this embodiment, a data center computer room 20 is used as an example to illustrate the heat recovery system 10 for recovering waste heat.

[0072] In related technologies, heat recovery systems 10 used to recover waste heat from data centers typically employ air-to-air sensible heat exchange or air-to-water sensible heat exchange. Figure 1 This is a schematic diagram of an air-to-air sensible heat exchange structure in related technologies, such as... Figure 1As shown, in the air-to-air sensible heat exchange method, the interior of the computer room 20 can be connected to the heating area 800 through an air-to-air heat exchanger 600. During the operation of the data center, the air in the computer room 20 exchanges heat with the air in the heating area 800 to transfer the waste heat in the computer room 20 to the heating area 800. However, the heat exchange efficiency of air-to-air sensible heat exchange is low, and the air supply heating distance and heating capacity are limited, which means that the heating area 800 needs to be set up close to the computer room 20. Figure 2 This is a schematic diagram of the air-water sensible heat exchange structure in related technologies, such as... Figure 2 As shown, in the air-water sensible heat exchange method, multiple heat exchange tubes 700 are installed inside the computer room 20, and heat exchange fluid is installed inside the heat exchange tubes 700. The air in the computer room 20 exchanges heat with the heat exchange fluid, causing the temperature of the heat exchange fluid to rise. Subsequently, the heated heat exchange fluid exchanges heat with the air in the heating area 800 to transfer the waste heat in the computer room 20 to the heating area 800. However, the heat exchange efficiency between air and heat exchange fluid is low. In addition, the arrangement of heat exchange tubes 700 in the computer room 20 poses a problem of heat exchange fluid leakage. The heat exchange fluid can be water. Therefore, the heat recovery system 10 of the related technology has low heat exchange efficiency in the data center.

[0073] In view of this, this application provides a heat recovery system 10, which has high air heat exchange efficiency with the computer room 20 of the data center, helping to improve the utilization rate of waste heat in the data center, thereby improving the energy efficiency of the heat recovery system 10 and its cooling efficiency for the data center. In addition, the heat recovery system 10 has a long heating distance, which can expand its application range.

[0074] The implementation of the heat recovery system 10 and the control method of the heat recovery system 10 provided in the embodiments of this application will be described below.

[0075] Figure 3 This is a schematic diagram of the structure of a first heat recovery system provided in an embodiment of this application. Figure 2As shown in the illustration, this application provides a heat recovery system 10, which includes at least an evaporative cooling unit 100, a heat pump unit 200, and a heating unit 300. The evaporative cooling unit 100 is used in conjunction with a data center server room 20 to regulate the temperature inside the server room 20. To regulate the temperature inside the server room 20, the evaporative cooling unit 100 includes at least an indoor passage 110, an outdoor passage 120, and a first heat exchanger 130. The air inlet and outlet of the indoor passage 110 are connected to the air outlet and air inlet of the server room 20, respectively, so that air inside the server room 20 (indoor air) can enter the first heat exchanger 130 through the indoor passage 110. The outdoor passage 120 is used to connect the first heat exchanger 130 with the external environment, so that air from the external environment (outdoor air) can enter the first heat exchanger 130, and the first heat exchanger 130 can exchange heat between the air in the indoor passage 110 and the air in the outdoor passage 120. The temperature of the indoor air entering the indoor passage 110 is higher than that of the outdoor air entering the outdoor passage 120, ensuring that the outdoor air can absorb the heat carried by the indoor air. For ease of description, in this embodiment, the air in the computer room 20 is described as indoor air, and the air in the external environment is described as outdoor air.

[0076] During data center operation, indoor air enters indoor channel 110 through the air outlet of server room 20, and then enters the first heat exchanger 130. At the same time, outdoor air enters outdoor channel 120 through the air inlet of outdoor channel 120, and then enters the first heat exchanger 130. The first heat exchanger 130 allows outdoor air to exchange heat with outdoor air, which can reduce the temperature of indoor air, allowing indoor air to change from high-temperature gas to low-temperature gas. The low-temperature indoor air returns to server room 20 through the air inlet of server room 20 and absorbs the residual heat of server room 20 again. Meanwhile, the outdoor air that has absorbed heat enters the outside environment through the air outlet of outdoor channel 120. In this way, the temperature inside server room 20 can be reduced.

[0077] The heat pump unit 200 supplies heat carried by indoor air to the heating unit 300, allowing waste heat from the data center to serve as a heat source. To extract heat from the indoor air, the heat pump unit 200 may include a second heat exchanger 210 and a third heat exchanger 220. The second heat exchanger 210 is disposed within the indoor passage 110 and located between the air inlet of the indoor passage 110 and the first heat exchanger 130. The refrigerant within the second heat exchanger 210 can exchange heat with the indoor air flowing out from the air outlet of the computer room 20. The output of the second heat exchanger 210 is connected to the input of the third heat exchanger 220, and the input of the second heat exchanger 210 is connected to the output of the third heat exchanger 220.

[0078] During data center operation, the liquid refrigerant in the second heat exchanger 210 exchanges heat with the indoor air entering the indoor passage 110 from the air outlet of the server room 20. When the heat absorbed by the liquid refrigerant reaches the phase change temperature threshold, the liquid refrigerant changes from a liquid state to a gaseous state. Subsequently, the gaseous refrigerant enters the third heat exchanger 220 (e.g., from the outlet of the second heat exchanger 210) from the outlet of the second heat exchanger 210. Figure 3 (As shown in the image, the gaseous refrigerant) exchanges heat with the heating fluid through the third heat exchanger 220. This process condenses the gaseous refrigerant into a liquid state, which then flows from the outlet of the third heat exchanger 220 into the second heat exchanger 210 (as shown in the image). Figure 3 (As shown in the image) The liquid refrigerant can, on the other hand, raise the temperature of the heating fluid. Specifically, the liquid refrigerant formed in the third heat exchanger 220 enters the second heat exchanger 210 from the output of the third heat exchanger 220 to achieve refrigerant circulation.

[0079] The heating unit 300 is used to transfer the waste heat from the machine room 20 to the area to be heated. Therefore, the heating unit 300 may include at least one fourth heat exchanger 310, which is located in the area to be heated. During the operation of the heating unit 300, the heating fluid (such as...) experiences a temperature increase after heat exchange with the gaseous refrigerant. Figure 3 The heating fluid (as shown in the diagram) enters the fourth heat exchanger 310. Under the action of the fourth heat exchanger 310, the heating fluid exchanges heat with the air in the area to be heated, raising the temperature of the air in the area and thus achieving heating. The heating fluid can be a liquid such as water or fluorinated liquid; no specific restrictions are imposed. Furthermore, the area to be heated can be the interior space of buildings such as office buildings or residences; no specific restrictions are imposed.

[0080] Because the heat pump unit 200 uses a refrigerant capable of phase change to absorb heat carried by the indoor air and transfers the absorbed heat to the heating fluid through a heat exchanger, the heat exchange efficiency between the heat recovery system 10 and the indoor air can be improved, thus enhancing the energy efficiency of the heat recovery system 10. Furthermore, since the refrigerant changes from a liquid to a gaseous state after absorbing heat in the indoor passage 110, refrigerant leakage within the indoor passage 110 can be prevented, contributing to improved reliability of the heat recovery system 10. In addition, the heating unit 300 uses the heating fluid to transfer the heat recovered by the heat recovery system 10 to the area to be heated, increasing the heating distance.

[0081] It is understandable that there are two ways to reduce the temperature of indoor air. The first way is to exchange heat with the outdoor air through the first heat exchanger 130, and the second way is to exchange heat with the refrigerant through the second heat exchanger 210. Therefore, the heat recovery system 10 improves the cooling efficiency of the evaporative cooling unit 100 on the one hand, and the heat recovery efficiency of the heat pump unit 200 on the other hand.

[0082] In one possible implementation, the third heat exchanger 220 is located above the second heat exchanger 210 (not shown in the figure). This arrangement allows the refrigerant to circulate between the second heat exchanger 210 and the third heat exchanger 220 without the need for a compressor 230.

[0083] It should be noted that the reference direction for the third heat exchanger 220 being located above the second heat exchanger 210 can be the direction of gravity. The principle behind this arrangement is that hot air rises. In this embodiment, the formation process of gaseous refrigerant is in the second heat exchanger 210, while the formation process of liquid refrigerant is in the third heat exchanger 220. Therefore, placing the third heat exchanger 220 above the second heat exchanger 210 allows the refrigerant to circulate.

[0084] Figure 4 This is a schematic diagram of the structure of a second heat recovery system provided in an embodiment of this application.

[0085] In another possible implementation, such as Figure 4 As shown, the heat pump unit 200 may further include a compressor 230 and an expansion valve 240. The input end of the second heat exchanger 210 is connected to the output end of the third heat exchanger 220 via the expansion valve 240, and the output end of the second heat exchanger 210 is connected to the input end of the third heat exchanger 220 via the compressor 230. The expansion valve 240 is used to reduce throttling and pressure drop and can regulate the flow rate of the refrigerant, ensuring that the refrigerant plays a role in absorbing heat in the second heat exchanger 210. The compressor 230 is used to increase the pressure of the gaseous refrigerant, allowing the gaseous refrigerant to move from the second heat exchanger 210 to the third heat exchanger 220 to remove the heat absorbed by the refrigerant. Through the expansion valve 240 and the compressor 230, the heat pump unit 200 can be arranged in any location, which helps to improve the application range of the heat recovery system 10.

[0086] Understandably, the output and input ends of the expansion valve 240 can be connected to the input end of the second heat exchanger 210 and the output end of the third heat exchanger 220 via pipes, respectively. Similarly, the output and input ends of the compressor 230 can also be connected to the input end of the third heat exchanger 220 and the output end of the second heat exchanger 210 via pipes, respectively.

[0087] To facilitate maintenance of the expansion valve 240 and the compressor 230, both the compressor 230 and the expansion valve 240 can be installed outside the evaporative cooling unit 100.

[0088] Figure 5 This is a schematic diagram of the structure of the first type of evaporative cooling unit provided in the embodiments of this application.

[0089] In one possible implementation, in order to achieve heat exchange between indoor and outdoor air, such as Figure 5 As shown, the evaporative cooling unit 100 may further include a housing 140 and a baffle assembly 150. The housing 140 has a cavity, and the baffle assembly 150 and the first heat exchanger 130 are both installed within the cavity. The baffle assembly 150, the first heat exchanger 130, and the inner wall of the cavity together define a first air inlet cavity 141, a first air outlet cavity 142, a second air inlet cavity 143, and a second air outlet cavity 144. To prevent indoor air from mixing with outdoor air and to enable heat exchange, the first heat exchanger 130 has a first channel 131 and a second channel 132 that are spaced apart from each other.

[0090] The first air inlet chamber 141 is connected to the air inlet end of the first channel 131. A first air inlet is formed on the inner wall of the first air inlet chamber 141, serving as the air inlet end of the indoor channel 110 and connecting to the air outlet end of the computer room 20. The first air outlet chamber 142 is connected to the air outlet end of the first channel 131. A first air outlet is formed on the inner wall of the second air inlet chamber 143, serving as the air outlet end of the indoor channel 110 and connecting to the air inlet end of the computer room 20. This configuration allows indoor air in the computer room 20 to enter the first channel 131, enabling heat exchange between indoor and outdoor air.

[0091] The second air inlet cavity 143 is connected to the air inlet end of the second channel 132. A second air inlet is formed on the inner wall of the second air inlet cavity 143, serving as the air inlet end of the outdoor channel 120 and connecting it to the external environment. The second air outlet cavity 144 is connected to the air outlet end of the second channel 132. A second air outlet is formed on the inner wall of the second air outlet cavity 144, serving as the air outlet end of the outdoor channel 120 and also connecting it to the external environment. With this configuration, outdoor air from the outside environment can enter the second channel 132 and exchange heat with the indoor air in the first channel 131, thereby reducing the temperature of the indoor air in the first channel 131.

[0092] The second heat exchanger 210 is installed inside the first air inlet cavity 141, so that the liquid refrigerant can exchange heat with the indoor air inside the first air inlet cavity 141 to recover the waste heat of the machine room 20.

[0093] It should be noted that the shape of the first heat exchanger 130 can be circular or polygonal, etc., and there is no specific limitation here. For example, in the embodiment of this application, the shape of the first heat exchanger 130 is prismatic.

[0094] It is understood that the partition assembly 150 between the first air inlet cavity 141 and the first air outlet cavity 142 has a first connecting structure, which allows the first air inlet cavity 141 and the first air outlet cavity 142 to jointly define the indoor passage 110. Additionally, a portion of the first heat exchanger 130 is located within the first connecting structure, allowing the air in the indoor passage 110 to exchange heat with the air in the outdoor passage 120. Similarly, the partition assembly 150 between the second air inlet cavity 143 and the second air outlet cavity 144 also has a second connecting structure, which allows the second air inlet cavity 143 and the second air outlet cavity 144 to jointly define the outdoor passage 120. Additionally, a portion of the first heat exchanger 130 is also located within the second connecting structure, allowing the air in the indoor passage 110 to exchange heat with the air in the outdoor passage 120.

[0095] like Figure 5 As shown, the baffle assembly 150 may include multiple baffles for cooperating with the first heat exchanger 130 to divide the cavity into a first air outlet cavity 142, a first air inlet cavity 141, a second air inlet cavity 143, and a second air outlet cavity 144.

[0096] The specific number of baffles can be determined according to the shape and size of the first heat exchanger 130. For example, in some examples, the first heat exchanger 130 divides the cavity into two separate first cavities and second cavities. In this case, the baffle assembly 150 may include two baffles (not shown in the figure), one of which divides the first cavity into a first air outlet cavity 142 and a first air inlet cavity 141, and the other baffle divides the second cavity into a second air outlet cavity 144 and a second air inlet cavity 143. In other examples, such as... Figure 5 As shown, the partition assembly 150 may include a first partition 151, a second partition 152, a third partition 153, and a fourth partition 154. The first partition 151, the second partition 152, the third partition 153, and the fourth partition 154 are arranged around the first heat exchanger 130 and spaced apart, so that any two adjacent partitions of the first partition 151, the second partition 152, the third partition 153, and the fourth partition 154 together with the cavity and the first heat exchanger 130 define an air inlet cavity or an air outlet cavity.

[0097] In some examples, such as Figure 5 As shown, the first air inlet cavity 141 and the first air outlet cavity 142 are both located on the first side of the first heat exchanger 130. The second air inlet cavity 143 and the second air outlet cavity 144 are both located on the second side of the first heat exchanger 130. The first side and the second side of the heat exchanger are arranged opposite each other. This arrangement helps to increase the heat exchange area between the air in the indoor passage 110 and the air in the outdoor passage 120, thereby improving the heat exchange effect.

[0098] It is understandable that the first channel 131 and the second channel 132 are arranged side by side so that the first air inlet cavity 141 is connected to the first air outlet cavity 142 through the first channel 131, and the second air inlet cavity 143 is connected to the second air outlet cavity 144 through the second channel 132.

[0099] Figure 6 This is a schematic diagram of the structure of a second type of evaporative cooling unit provided in an embodiment of this application.

[0100] In other examples, such as Figure 6 As shown, the first channel 131 and the second channel 132 are intersecting. In other words, the first channel 131 and the second channel 132 are arranged in an X-shape. Therefore, the indoor channel 110 and the outdoor channel 120 are also arranged in an X-shape.

[0101] Figure 7 This is a schematic diagram of an evaporative cooling unit with an indoor fan, provided as an embodiment of this application.

[0102] In one possible implementation, such as Figure 7 As shown, the evaporative cooling unit 100 may further include an indoor fan 160, which is disposed within the first air outlet cavity 142 and is electrically connected to a control device. The indoor fan 160 drives airflow within the indoor passage 110, which helps improve the heat exchange effect.

[0103] It should be noted that the indoor fan 160 can also be installed inside the first air inlet cavity 141, and no specific restrictions are made here.

[0104] Figure 8 This is a schematic diagram of an evaporative cooling unit with an outdoor fan, provided as an embodiment of this application.

[0105] In one possible implementation, such as Figure 8 As shown, the evaporative cooling unit 100 may further include an outdoor fan 170, which is disposed within the second air outlet cavity 144 and is used for electrical connection with the control device. The outdoor fan 170 drives airflow within the outdoor duct 120, which helps improve the heat exchange effect.

[0106] It should be noted that the outdoor fan 170 can also be installed inside the second air inlet cavity 143; no specific restrictions are imposed here. Additionally, Figure 9 This is a schematic diagram of an evaporative cooling unit with an outdoor fan and an indoor fan, provided as an embodiment of this application. Figure 9 As shown, indoor fan 160 and outdoor fan 170 can coexist.

[0107] Figure 10This is a schematic diagram of an evaporative cooling unit with connecting channels and switching components provided in an embodiment of this application.

[0108] In one possible implementation, to improve the energy-saving effect of the evaporative cooling unit 100, such as Figure 10 As shown, the evaporative cooling unit 100 may further include a connecting channel 145 and a switching assembly 180. The two ends of the connecting channel 145 are respectively connected to the first air inlet chamber 141 and the first air outlet chamber 142, allowing air from the first air inlet chamber 141 to enter the first air outlet chamber 142. The switching assembly 180 is electrically connected to a control device and controls the opening size of the connecting channel 145. When the temperature in the machine room 20 and the air temperature in the area to be heated both meet the usage requirements, the switching assembly 180 opens the connecting channel 145, guiding air from the first air inlet chamber 141 into the first air outlet chamber 142. This reduces the amount of air entering through the first channel 131, thereby reducing the resistance of air flowing through the first heat exchanger 130 in the indoor channel 110 and contributing to improved energy efficiency of the evaporative cooling unit 100.

[0109] It should be noted that the connecting flow channel 145 can be provided on the baffle assembly 150 or the first heat exchanger 130. Alternatively, a connecting pipe can be provided within the cavity to connect the first air inlet cavity 141 and the first air outlet cavity 142; no specific limitation is made here. For example, in this embodiment, a through hole is provided through the baffle assembly 150 of the first air inlet cavity 141 and the first air outlet cavity 142, and this through hole serves as the connecting flow channel 145. Specifically, with... Figure 10 Taking the partition assembly 150 shown as an example, through holes are provided on the first partition 151.

[0110] It should also be noted that the connecting channel 145 and the switching assembly 180 can coexist with at least one of the indoor fan 160 and the outdoor fan 170.

[0111] Figure 11 This is a schematic diagram of a switch assembly provided in an embodiment of this application.

[0112] In some examples, such as Figure 11 As shown, the switching assembly 180 may include a bypass valve 181, which may be installed within the connecting flow channel 145. For example, when the connecting flow channel 145 is a through hole, the bypass valve 181 may be installed at the through hole, thereby controlling the opening of the through hole. On the one hand, this allows air in the first air inlet chamber 141 to enter the first air outlet chamber 142, and on the other hand, it controls the airflow rate of air entering the first air outlet chamber 142 from the first air inlet chamber 141.

[0113] Figure 12 This is a schematic diagram of another switching component provided in an embodiment of this application.

[0114] In other examples, when the connecting channel 145 is a through-hole through the partition assembly 150, such as Figure 12 As shown, the switch assembly 180 may include a power element 182 and a slide plate 183 slidably connected to the partition assembly 150. The power element 182 is electrically connected to a control device and drives the slide plate 183 to move on the partition to change the opening size of the connecting flow channel 145. When the slide plate 183 completely covers the through hole, the connecting flow channel 145 is not conductive, and air in the first air inlet chamber 141 cannot enter the first air outlet chamber 142 through the connecting flow channel 145. When the slide plate 183 does not completely cover the through hole, air in the first air inlet chamber 141 can enter the first air outlet chamber 142 through the connecting flow channel 145. In addition, the area of ​​the slide plate 183 covering the through hole can be controlled by adjusting the through hole to control the airflow rate from the first air inlet chamber 141 to the first air outlet chamber 142.

[0115] The power element 182 can be a cylinder, hydraulic cylinder or other element capable of reciprocating linear motion. Alternatively, the power element 182 can include a motor and a lead screw mechanism. The motor is driven and connected to the slide plate 183 through the lead screw mechanism. No specific limitation is made here.

[0116] Figure 13 This is a schematic diagram of an evaporative cooling unit with a cooling component provided in an embodiment of this application. Figure 14 This is a schematic diagram of the cooling component provided in an embodiment of this application.

[0117] In one possible implementation, such as Figure 13 As shown, the evaporative cooling unit 100 may further include a cooling component 190 disposed at the second air inlet. The cooling component 190 is used to reduce the temperature of the air entering the second air inlet cavity 143 from the second air inlet, which helps to absorb more heat from the air in the indoor passage 110.

[0118] It should be noted that the cooling component 190 can coexist with at least one of the connecting channel 145, indoor fan 160 and outdoor fan 170, without any specific restrictions.

[0119] like Figure 14 As shown, the cooling assembly 190 may include a wet film 191 covering the second air inlet. Moisture on the wet film 191 can exchange heat with the air passing through the wet film 191, thereby reducing the temperature of the air entering the second air inlet cavity 143.

[0120] The wet film 191 can be an organic wet film, an inorganic wet film, an aluminum alloy mesh wet film, a stainless steel perforated wet film, etc., and no specific restrictions are made here.

[0121] To ensure the reusability of the wet membrane 191, such as Figure 14 As shown, the cooling assembly 190 may further include a water pump 193, a circulating water tank 192, and a water distributor 194. The water distributor 194 is located above the wet membrane 191 and is used to evenly distribute water, ensuring that water is present throughout the wet membrane 191. The input end of the water distributor 194 is connected to the circulating water tank 192 via the water pump 193, allowing water from the circulating water tank 192 to be transported to the water distributor 194 by the water pump 193. When the cooling assembly 190 is operating, the water pump 193 transports water from the circulating water tank 192 to the water distributor 194, which evenly distributes the water on the wet membrane 191. Under the influence of gravity, the water flows down the surface of the wet membrane 191, wetting its surface. Unevaporated water flowing down from the wet membrane 191 flows into the circulating water tank 192 and is then pumped back to the top of the wet membrane 191 by the circulating water pump 193. This process is repeated continuously.

[0122] Of course, the wet membrane 191 can also be replaced with an inclined mesh plate with multiple ventilation holes. Outdoor air enters the second air inlet chamber 143 through the ventilation holes. In addition, under the action of gravity, water flows on the mesh plate and enters the circulating water tank 192.

[0123] Figure 15 This is a schematic diagram of the structure of the heating unit provided in the embodiment of this application.

[0124] In one possible implementation, in order to condense the gaseous refrigerant into a liquid refrigerant and raise the temperature of the heating fluid, such as Figure 15 As shown, the heating unit 300 may further include a heat exchange box 320 and a transfer pump 330. The heat exchange box 320 is used to contain the heating fluid, and the heat exchange box 320 can be a closed box structure or a cylindrical structure, without specific limitations. A third heat exchanger 220 is disposed in the heat exchange box 320 and immersed in the heating fluid. The input end of at least one fourth heat exchanger 310 is connected to the heat exchange box 320 through the transfer pump 330, and the output end of at least one fourth heat exchanger 310 is connected to the heat exchange box 320. The transfer pump 330 is used to transfer the heating fluid in the heat exchange box 320 to at least one fourth heat exchanger 310. During the operation of the heating unit 300, the transfer pump 330 enables the heating fluid to circulate between the heat exchange box 320 and at least one fourth heat exchanger 310, transferring the heat absorbed by the refrigerant to the area to be heated.

[0125] Understandably, the delivery pump 330 can be electrically connected to a control device to control the operating field of view or start / stop of the delivery pump 330.

[0126] Figure 16 This is a schematic diagram of the structure of a third heat recovery system provided in an embodiment of this application.

[0127] In one possible implementation, such as Figure 16 As shown, the heat recovery system 10 may further include: a first temperature sensor 400, a second temperature sensor 500, and a control device (not shown in the figure). The first temperature sensor 400 and the second temperature sensor 500 are electrically connected to the control device. The first temperature sensor 400 is used to detect the heating temperature of the heating unit 300. It should be noted that this heating temperature is the temperature of the area to be heated. In addition, the first temperature sensor 400 can be installed on the fourth heat exchanger 310, without specific limitations. The first temperature sensor 400 includes, but is not limited to, common temperature sensors such as thermocouple sensors, thermistor sensors, resistance temperature detectors, and IC temperature sensors in the prior art. The second temperature sensor 500 is used to detect the supply air temperature at the air outlet of the indoor channel 110.

[0128] The second temperature sensor 500 can be installed at the air outlet of the indoor channel 110, or at the air inlet of the machine room 20. Alternatively, it can be installed in other locations within the machine room 20, as long as it can detect the temperature of the indoor air supplied to the machine room 20 by the indoor channel 110. No specific limitations are imposed here. The control device is used to control the rotational speed of the outdoor fan 170 based on the heating temperature and the supply air temperature. The second temperature sensor 500 includes, but is not limited to, common temperature sensors such as thermocouple sensors, thermistor sensors, resistance temperature detectors, and IC temperature sensors found in the prior art. The second temperature sensor 500 is used to detect the supply air temperature at the air outlet of the indoor channel 110.

[0129] The control device is used to control the speed of the outdoor fan 170 according to the heating temperature and the supply air temperature, so that the outdoor fan 170 is linked to the heating temperature and the supply air temperature for control, which helps to achieve energy saving of the evaporative cooling unit 100 and can reduce the energy consumption of the heat recovery system 10. In addition, the control device can be a common control device such as an existing programmable logic controller (PLC) or an industrial computer, and no specific restrictions are made here.

[0130] For adjusting the speed of outdoor fan 170, the following settings can be used as a reference: If the heating temperature is higher than the first temperature threshold, increase the current speed of outdoor fan 170 to the first speed. If the heating temperature is lower than the second temperature threshold, decrease the current speed of outdoor fan 170 to the second speed. The second temperature threshold is lower than the first temperature threshold. If the heating temperature is within the first preset range and the air supply temperature is within the second preset range, reduce the speed of outdoor fan 170 to 0.

[0131] It should be noted that the first and second temperature thresholds can be determined according to usage requirements and are not specifically limited here. For example, in some examples, the first temperature threshold is 30°C and the second temperature threshold is 20°C. Additionally, the first and second rotational speeds can also be determined according to usage requirements or the environment in which the heat recovery system 10 is located, and are not specifically limited here.

[0132] The first preset range can be determined based on the heating demand in the area to be heated, and no specific restrictions are imposed here. For example, the first preset range is 29℃±1℃. Similarly, the second preset range can also be determined based on the heat dissipation demand of the computer room 20, and no specific restrictions are imposed here. For example, the second preset range is 18℃±1℃.

[0133] In summary, by coordinating the rotational speed and operating timing of the outdoor fan 170 with the heating temperature and the air supply temperature, energy saving of the evaporative cooling unit 100 can be achieved, and the energy consumption of the heat recovery system 10 can be reduced.

[0134] To further improve the energy-saving effect of the evaporative cooling unit 100, the control device can also control the opening of the connecting channel 145 according to the heating temperature and the air supply temperature. For example, if the heating temperature is within a first preset range and the air supply temperature is within a second preset range, the connecting channel 145 is open, and some of the air in the first air inlet chamber 141 can enter the first air outlet chamber 142 through the connecting channel 145, thereby reducing the resistance of the air in the first air inlet chamber 141 to the first heat exchanger 130, which helps to further improve the energy-saving effect of the evaporative cooling unit 100.

[0135] It should be noted that if the heating temperature is within the first preset range and the air supply temperature is within the second preset range, the connection between the flow channel 145 and the outdoor fan 170 can both be 0, or one of them can be 0. No specific restrictions are imposed here.

[0136] Figure 17 A flowchart illustrating a control method for a heat recovery system provided in an embodiment of this application. This application also provides a control method for a heat recovery system 10, such as… Figure 17As shown, the control method may include the following steps:

[0137] S101. Obtain the heating temperature of the heating unit 300 and the supply air temperature at the outlet end of the indoor passage 110. The heating temperature of the heating unit 300 refers to the temperature of the area to be heated. Alternatively, the heating temperature can be obtained through a first temperature sensor 400, which then sends the obtained heating temperature to the control device. The supply air temperature refers to the temperature of the indoor air supplied to the machine room 20 from the outlet end of the indoor passage 110. The supply air temperature can be obtained through a second temperature sensor 500 and sent to the control device. In some examples, the second temperature sensor 500 is located inside the indoor passage 110 and close to the outlet end of the indoor passage 110.

[0138] S102. The speed of the outdoor fan 170 is controlled according to the heating temperature and the air supply temperature. Specifically, the control device controls the speed of the outdoor fan 170 based on the heating temperature and the air supply temperature.

[0139] Specifically, the control device can control the speed of the outdoor fan 170 according to the following steps: if the heating temperature is greater than the first temperature threshold, the current speed of the outdoor fan 170 is increased to the first speed; if the heating temperature is less than the second temperature threshold, the current speed of the outdoor fan 170 is decreased to the second speed; wherein the second temperature threshold is less than the first temperature threshold; if the heating temperature is within the first preset range and the air supply temperature is within the second preset range, the speed of the outdoor fan 170 is reduced to 0.

[0140] The first and second temperature thresholds are both preset in the control device. The specific values ​​of the first and second temperature thresholds can be determined based on the heat dissipation requirements of the computer room 20 and the heating requirements of the area to be heated; no specific restrictions are imposed here. For example, in some examples, the first temperature threshold is 30℃ and the second temperature threshold is 20℃.

[0141] The first preset range and the second preset range are both preset ranges set in the control device in advance, and no specific restrictions are imposed here. For example, the first preset range is 29℃±1℃ and the second preset range is 18℃±1℃.

[0142] Therefore, by using steps S101 and S102, the speed and running time of the outdoor fan 170 can be controlled, which helps to improve the energy-saving effect of the heat recovery system 10.

[0143] In one possible implementation, the control method of the heat recovery system 10 may further include the following steps: S103, controlling the continuity of the connecting flow channel 145 according to the heating temperature and the air supply temperature. Step S103 can further improve the energy-saving effect of the evaporative cooling unit 100.

[0144] Specifically, if the heating temperature is within the first preset range and the air supply temperature is within the second preset range, the control device controls the switch assembly 180 to activate the connecting flow channel 145, and then the air in the first air inlet chamber 141 can enter the first air outlet chamber 142, which helps to reduce the resistance of the air in the first air inlet chamber 141 through the first heat exchanger 130, thereby improving the energy-saving effect of the evaporative cooling unit 100.

[0145] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0146] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0147] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0148] The term "multiple" in this article refers to two or more. The term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects; in formulas, the character " / " indicates a "division" relationship between the preceding and following related objects.

[0149] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0150] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A heat recovery system, characterized in that, At least including: Evaporative cooling units, heat pump units, and heating units; The evaporative cooling unit includes an indoor passage, an outdoor passage, and a first heat exchanger; The first heat exchanger is used to exchange heat between the air in the indoor passage and the air in the outdoor passage, so as to reduce the temperature of the air in the indoor passage; The heat pump unit includes a second heat exchanger and a third heat exchanger; The second heat exchanger is integrated in the indoor channel and located between the air inlet of the indoor channel and the first heat exchanger. The output end of the second heat exchanger is connected to the input end of the third heat exchanger, and the input end of the second heat exchanger is connected to the output end of the third heat exchanger. The second heat exchanger is used to exchange heat between the liquid refrigerant and the air entering the indoor channel so that the refrigerant undergoes a phase change. The third heat exchanger is used to exchange heat between the gaseous refrigerant and the liquid heating fluid, so that the gaseous refrigerant condenses into liquid refrigerant; the third heat exchanger is located above the second heat exchanger. The heating unit includes at least one fourth heat exchanger, which is used to exchange heat between the heating fluid and the air in the area to be heated. The heat recovery system also includes a control device, which is used to control the operating status of the heat recovery system according to the heating temperature of the heating unit and the air supply temperature at the outlet end of the indoor passage, so as to achieve energy saving and optimized operation.

2. The heat recovery system according to claim 1, characterized in that, Also includes: Housing and partition assembly; The housing has a cavity, the partition assembly and the first heat exchanger are both installed in the cavity, and the partition assembly, the first heat exchanger and the inner wall of the cavity together define a first air inlet cavity, a first air outlet cavity, a second air inlet cavity and a second air outlet cavity; The first heat exchanger has a first channel and a second channel that are spaced apart from each other; The first air inlet cavity is connected to the air inlet end of the first channel. The inner wall of the first air inlet cavity is provided with a first air inlet, and the first air inlet serves as the air inlet end of the indoor channel. The first air outlet cavity is connected to the air outlet end of the first channel, and the inner wall of the second air inlet cavity is provided with a first air outlet, which serves as the air outlet end of the indoor channel. The second air inlet cavity is connected to the air inlet end of the second channel. The inner wall of the second air inlet cavity is provided with a second air inlet, and the second air inlet serves as the air inlet end of the outdoor channel. The second air outlet cavity is connected to the air outlet end of the second channel. The inner wall of the second air outlet cavity is provided with a second air outlet, and the second air outlet serves as the air outlet end of the outdoor channel. The second heat exchanger is disposed within the first air inlet chamber.

3. The heat recovery system according to claim 2, characterized in that, Both the first air inlet cavity and the first air outlet cavity are located on the first side of the first heat exchanger; The second air inlet cavity and the second air outlet cavity are both located on the second side of the first heat exchanger; wherein the first side of the heat exchanger is arranged opposite to the second side of the heat exchanger.

4. The heat recovery system according to claim 2 or 3, characterized in that, Also includes: An indoor fan is disposed within the first air outlet cavity and is used for electrical connection with a control device.

5. The heat recovery system according to claim 2 or 3, characterized in that, Also includes: An outdoor fan is installed inside the second air outlet cavity and is used for electrical connection with a control device.

6. The heat recovery system according to claim 2 or 3, characterized in that, Also includes: Connecting flow channels and switching components; The two ends of the connecting channel are respectively connected to the first air inlet cavity and the first air outlet cavity, and the connecting channel is used to allow air in the first air inlet cavity to enter the first air outlet cavity. The switching assembly is used for electrical connection with the control device and for controlling the opening size of the connection channel.

7. The heat recovery system according to claim 6, characterized in that, The switching assembly includes a bypass valve installed within the connecting flow channel; or... The connecting flow channel is a through hole in the partition assembly that passes through the first air inlet cavity and the first air outlet cavity; the switching assembly includes a power element and a sliding plate that is slidably connected to the partition assembly; the power element is used to be electrically connected to the control device and to drive the sliding plate to move on the partition to change the opening size of the connecting flow channel.

8. The heat recovery system according to any one of claims 2, 3, or 7, characterized in that, Also includes: A cooling component is provided at the second air inlet, which is used to reduce the temperature of the air entering the second air inlet cavity from the second air inlet.

9. The heat recovery system according to claim 8, characterized in that, The cooling component includes a wet film covering the second air inlet.

10. The heat recovery system according to any one of claims 1 to 3, 7, and 9, characterized in that, The heating unit also includes: a heat exchange box and a delivery pump; The heat exchange box is used to contain the heating fluid; The third heat exchanger is installed inside the heat exchange box and immersed in the heating fluid; The input end of the at least one fourth heat exchanger is connected to the heat exchange box via the delivery pump, and the output end of the at least one fourth heat exchanger is connected to the heat exchange box. The delivery pump is used to deliver the heating fluid in the heat exchange box to the at least one fourth heat exchanger.

11. The heat recovery system according to claim 7 or 9, characterized in that, Also includes: First temperature sensor, second temperature sensor; The first temperature sensor and the second temperature sensor are respectively electrically connected to the control device; The first temperature sensor is used to detect the heating temperature of the heating unit; The second temperature sensor is used to detect the supply air temperature at the air outlet of the indoor channel; The control device is used to control the rotational speed of the outdoor fan according to the heating temperature and the air supply temperature.

12. A control method for a heat recovery system, said control method being applied to the heat recovery system according to any one of claims 1-11, characterized in that, include: Obtain the heating temperature of the heating unit and the air supply temperature at the outlet of the indoor passage; The speed of the outdoor fan is controlled according to the heating temperature and the air supply temperature.

13. The control method for the heat recovery system according to claim 12, characterized in that, The step of controlling the speed of the outdoor fan based on the heating temperature and the air supply temperature includes: If the heating temperature is greater than the first temperature threshold, the current speed of the outdoor fan will be increased to the first speed. If the heating temperature is lower than the second temperature threshold, the current speed of the outdoor fan is reduced to the second speed; wherein the second temperature threshold is lower than the first temperature threshold. If the heating temperature is within a first preset range and the air supply temperature is within a second preset range, the rotation speed of the outdoor fan will be reduced to 0.

14. The control method for the heat recovery system according to claim 12 or 13, characterized in that, Also includes: The connection of the flow channel is controlled according to the heating temperature and the air supply temperature.

15. The control method for the heat recovery system according to claim 12 or 13, characterized in that, The control of the flow channel based on the heating temperature and the air supply temperature includes: If the heating temperature is within a first preset range and the air supply temperature is within a second preset range, the control switch assembly enables the connection channel to be opened.

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