Indirect evaporative cooling device and control method

Abstract

The present invention relates to the technical field of heat exchange equipment, and specifically discloses an indirect evaporative cooling device and a control method, wherein the indirect evaporative cooling device comprises a shell, a core assembly, a refrigeration system and a water distributor; the core assembly is located in the shell, and divides the internal space of the shell into a return air chamber, a supply air chamber, a fresh air chamber and an exhaust air chamber; the refrigeration system comprises an evaporator located in the supply air chamber and a condenser located in the exhaust air chamber; the exhaust air chamber is provided with a direct air inlet connected to the external space, and an openable and closable direct air inlet valve is provided at the direct air inlet; the water distributor is located in the fresh air chamber, and is used to spray cooling liquid flowing from the fresh air chamber to the exhaust air chamber onto the core assembly. The indirect evaporative cooling device and the control method provided by the present invention can effectively solve the problems of relatively low energy efficiency of the existing cooling equipment when the ambient temperature is too high and low heat exchange efficiency caused by the countercurrent heat exchange design.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and in particular to an indirect evaporative cooling device and a control method thereof. Background Art

[0002] The server has high requirements on the temperature of the working environment. In order to maintain a constant working temperature, the server is often stored in a storage cavity in a cabinet, and then a cooling device is configured for the cabinet to maintain a constant temperature of the storage cavity in the cabinet.

[0003] See also Figure 1 The existing cooling device includes a shell 1, a heat exchange core 201 located in the shell 1, a refrigeration system 3 located in the shell 1 and a water distributor 401 located in the shell 1. Furthermore, the heat exchange core 201 divides the internal space of the shell 1 into a return air chamber 101, a supply air chamber 102, a fresh air chamber 103 and an exhaust air chamber 104. The refrigeration system 3 includes an evaporator 304 located in the supply air chamber 102 and a condenser 302 located in the exhaust air chamber 104.

[0004] in,

[0005] The return air chamber 101 is connected to the air outlet of the cabinet, the return air chamber 101 is connected to the air supply chamber 102 through the heat flow channel of the heat exchange core 201, and the air supply chamber 102 is connected to the air inlet of the cabinet;

[0006] The fresh air chamber 103 and the exhaust air chamber 104 are both connected to the external space outside the cabinet and the shell 1 , and the fresh air chamber 103 and the exhaust air chamber 104 are connected through the cold flow channel of the heat exchange core 201 .

[0007] Specifically, the working process of the existing cooling equipment is as follows:

[0008] ① When the server is working, it releases heat, and the air temperature in the cabinet rises, forming a cabinet circulating airflow 7;

[0009] ② The cabinet circulating airflow 7 in the cabinet enters the heat flow channel of the heat exchange core 201 through the return air chamber 101. After absorbing the cold, the cabinet circulating airflow 7 is cooled down, and then enters the air supply chamber 102. After being further cooled down by the evaporator 304, it flows back into the cabinet and continues to absorb the heat released by the server, so as to provide a constant working temperature for the server.

[0010] ③ In general, the temperature of the fresh air in the outside space is lower than that in the cabinet. The fresh air enters the fresh air cavity 103 as the external circulation airflow 8, and then flows through the cold flow channel of the heat exchange core 201. After providing cooling for the cabinet circulation airflow 7 in the hot flow channel, the temperature of the external circulation airflow 8 rises. The heated external circulation airflow 8 then provides cooling for the condenser 302 in the exhaust cavity 104, and the temperature rises again. Finally, it leaves the exhaust cavity 104 and returns to the outside space.

[0011] ④ In order to improve the heat exchange efficiency, the water distributor 401 can be turned on. After the water distributor 401 sprays water to the heat exchange core 201, the water flows from Figure 1 The airflow in the figure flows from the upper right corner to the lower left corner, while the outer circulation airflow 8 flows from Figure 1 The air flows from the lower left corner to the upper right corner, and the external circulating airflow 8 forms a countercurrent heat exchange with the water.

[0012] The existing cooling equipment has the following two problems:

[0013] ① For existing cooling equipment, fresh air must pass through the heat exchange core 201 before entering the exhaust cavity 104 to cool the condenser 302. However, in actual work, it is found that in summer, the temperature in the southern region is sometimes very high, and there may be a situation where the ambient temperature in the outside space (i.e., the temperature of the fresh air) is similar to the temperature of the cabinet circulating airflow 7 in the return air cavity 101, and there may even be an extreme situation where the temperature of the fresh air in the outside space is higher than the temperature of the cabinet circulating airflow 7 in the return air cavity 101.

[0014] It is understandable that when the above extreme situation occurs, due to the excessively high ambient temperature, even if the fresh air is sent into the cold flow channel, it is actually unable to provide cooling for the cabinet circulating airflow 7 in the hot flow channel. Instead, it will increase the pressure drop before the fresh air enters the exhaust chamber 104, ultimately leading to a decrease in the energy efficiency ratio of the entire unit.

[0015] ② It is found in actual work that when the water sprayed by the sprinkler 401 exchanges heat with the external circulating airflow 8 in countercurrent, the water cannot flow down smoothly in the heat exchange core 201, which increases the wind resistance of the upstream external circulating airflow 8 and reduces the heat exchange efficiency.

[0016] Therefore, it is necessary to improve the existing cooling equipment to solve the problems of low energy efficiency of the unit when the ambient temperature is too high and excessive energy consumption caused by the countercurrent heat exchange design.

[0017] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the invention

[0018] An object of the present invention is to provide an indirect evaporative cooling device and a control method, which can effectively solve the problems of low energy efficiency of the existing cooling device when the ambient temperature is too high and low heat exchange efficiency caused by the countercurrent heat exchange design.

[0019] To achieve the above objectives, in one aspect, the present invention provides an indirect evaporative cooling device, comprising a shell, a core assembly, a refrigeration system and a water distributor;

[0020] The core assembly is located in the shell, and divides the internal space of the shell into a return air chamber, a supply air chamber, a fresh air chamber and an exhaust air chamber;

[0021] The refrigeration system includes an evaporator located in the air supply cavity and a condenser located in the air exhaust cavity;

[0022] The exhaust cavity is provided with a direct air inlet communicating with the external space, and the direct air inlet is provided with an openable and closable direct air valve;

[0023] The water distributor is located in the fresh air cavity, and is used for spraying cooling liquid flowing from the fresh air cavity toward the exhaust cavity to the core assembly.

[0024] Optionally, the core assembly is provided with a hot flow channel and a cold flow channel;

[0025] The return air chamber and the supply air chamber are communicated through the hot flow channel, and the fresh air chamber and the exhaust air chamber are communicated through the cold flow channel.

[0026] Optionally, a liquid collecting tank is provided in the exhaust cavity;

[0027] The liquid collecting tank is located obliquely below the core assembly and is used to collect the cooling liquid flowing out of the cold flow channel.

[0028] Optionally, a liquid delivery pump is provided in the exhaust chamber;

[0029] The inlet of the liquid delivery pump is communicated with the liquid collecting tank, and the outlet is communicated with the water distributor.

[0030] Optionally, the evaporator is located obliquely below the core assembly.

[0031] Optionally, the refrigeration system further includes a compressor and a throttling device located in the exhaust chamber.

[0032] The compressor, condenser, throttling device and evaporator are connected in sequence.

[0033] Optionally, a filter screen is provided in the return air chamber, and the filter screen is located obliquely above the core assembly.

[0034] Optionally, the core assembly includes a plurality of heat exchange cores, and the heat exchange cores are arranged in sequence along the length direction with their axes overlapping.

[0035] On the other hand, a control method is provided, which is performed by any of the indirect evaporative cooling devices, and comprises:

[0036] When T ring ≥ T return, open the direct air valve;

[0037] in,

[0038] T ring: ambient temperature of the external space;

[0039] Treturn: return air temperature of the return air chamber.

[0040] Optionally, also include:

[0041] When T ring < T1, the spray system (4), the refrigeration system and the direct air inlet valve are closed;

[0042] When T1<T ring<T2, the spray system (4) is turned on, and the refrigeration system and the direct air inlet valve are turned off;

[0043] When T2<T ring<T3, the spray system (4) and the refrigeration system are turned on, and the direct air inlet valve is closed;

[0044] in,

[0045] T1, T2 and T3: are all preset temperature thresholds, and T1<T2<T3≤T back.

[0046] The beneficial effects of the present invention are: providing an indirect evaporative cooling device and a control method,

[0047] On the one hand, an openable and closable direct air inlet valve is set at the exhaust cavity. When the ambient temperature is too high, the direct air inlet valve can be directly opened to introduce fresh air into the exhaust cavity. On the one hand, it can absorb the heat released by the condenser, and on the other hand, it can reduce the pressure drop caused by the fresh air flowing through the core assembly, thereby effectively improving the energy efficiency ratio of the unit;

[0048] On the other hand, the parallel flow heat exchange arrangement of the cooling liquid sprayed by the water distributor and the external circulating airflow is conducive to the formation of a uniform and stable liquid film in the cold flow channel. The liquid film reduces the wind resistance between the external circulating airflow and the cold flow channel, and makes the heat and moisture exchange between the external circulating airflow and the cooling liquid more complete, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 A schematic diagram of the structure of an existing cooling device provided as background technology;

[0051] Figure 2 A schematic diagram of the structure of an indirect evaporative cooling device when the direct air inlet valve is closed provided in an embodiment;

[0052] Figure 3A schematic diagram of the structure of an indirect evaporative cooling device when the direct air inlet valve is opened provided in an embodiment;

[0053] Figure 4 A flowchart of a control method provided in an embodiment.

[0054] In the figure:

[0055] 1. Shell; 101. Return air chamber; 102. Supply air chamber; 103. Fresh air chamber; 104. Exhaust air chamber;

[0056] 2. core assembly; 201. heat exchange core;

[0057] 3. Refrigeration system; 301. Compressor; 302. Condenser; 303. Throttling device; 304. Evaporator;

[0058] 4. Spraying system; 401. Water distributor; 402. Liquid collecting tank; 403. Liquid delivery pump;

[0059] 5. Air supply fan;

[0060] 6. Exhaust fan;

[0061] 7. Cabinet circulating airflow;

[0062] 8. External circulation airflow;

[0063] 9. Filter;

[0064] 10. Direct air valve. DETAILED DESCRIPTION

[0065] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0067] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0068] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0069] The present invention provides an indirect evaporative cooling device, and provides a control method executed by the indirect evaporative cooling device. It should be noted that the indirect evaporative cooling device of the present invention can be a cabinet heat dissipation unit for cooling a cabinet storing a server, or a container heat dissipation unit for cooling a container, or a heat dissipation device of other uses, etc., and the present invention does not limit this.

[0070] Example 1

[0071] In this embodiment, the indirect evaporative cooling device is taken as an example as a cabinet heat dissipation unit for detailed introduction.

[0072] See also Figure 2 The indirect evaporative cooling device comprises a shell 1, in which a core assembly 2, a refrigeration system 3, a spray system 4, an air supply fan 5 and an exhaust fan 6 are arranged.

[0073] Specifically, the core assembly 2 divides the internal space of the housing 1 into a return air chamber 101 for communicating with the air outlet of the cabinet, an air supply chamber 102 for communicating with the air inlet of the cabinet, a fresh air chamber 103 for communicating with the external space, and an exhaust air chamber 104 for communicating with the external space. The core assembly 2 is provided with a hot flow channel and a cold flow channel; the return air chamber 101 and the air supply chamber 102 are communicated through the hot flow channel, and the fresh air chamber 103 and the exhaust air chamber 104 are communicated through the cold flow channel; the air supply fan 5 is located in the air supply chamber 102, and the exhaust fan 6 is located in the exhaust air chamber 104.

[0074] It should be noted that when the cabinet is dissipating heat, driven by the supply fan 5, the cabinet circulating air flow 7 in the cabinet enters the hot flow channel of the core assembly 2 through the return air chamber 101, absorbs the cold from the cold flow channel, and then the temperature drops. Then, it returns to the cabinet through the supply air chamber 102 to cool the server again; driven by the exhaust fan 6, the fresh air in the external space (the temperature of the fresh air is generally lower than the temperature of the cabinet circulating air flow 7) serves as the external circulating air flow 8 through the fresh air chamber 103 to enter the cold flow channel, provides coldness for the hot flow channel, and is then sent back to the external space through the exhaust chamber 104.

[0075] The refrigeration system 3 includes a compressor 301, a condenser 302, a throttling device 303 and an evaporator 304 which are connected in sequence. The compressor 301 and the throttling device 303 are located in the exhaust cavity 104, the evaporator 304 is located in the air supply cavity 102 and obliquely below the core assembly 2, and the condenser 302 is located in the exhaust cavity 104. Therefore, before the cabinet circulating airflow 7 enters the cabinet, the evaporator 304 will cool down the cabinet circulating airflow 7 again, thereby improving the heat dissipation effect of the server; before the external circulating airflow 8 leaves the exhaust cavity 104, the condenser 302 will absorb the coldness of the external circulating airflow 8, thereby improving the refrigeration efficiency of the refrigeration system 3.

[0076] The spray system 4 includes a water distributor 401, a liquid collecting tank 402 and a liquid delivery pump 403. The water distributor 401 is located in the fresh air cavity 103 and is located obliquely above the core assembly 2, and is used to spray the cooling liquid flowing from the fresh air cavity 103 to the exhaust cavity 104 to the cold flow channel. The liquid collecting tank 402 is located in the exhaust cavity 104 and is located obliquely below the core assembly 2, and is used to collect the cooling liquid flowing out of the cold flow channel. The liquid delivery pump 403 is located in the exhaust cavity 104, and the inlet of the liquid delivery pump 403 is connected to the liquid collecting tank 402, and the outlet is connected to the water distributor 401. Specifically, during spraying, the liquid delivery pump 403 delivers the cooling liquid in the liquid collection tank 402 upward to the water distributor 401, and the water distributor 401 sprays the cooling liquid obliquely downward into the cold flow channel. Under the action of gravity, the cooling liquid automatically flows downward, while providing cold to the hot flow channel. The cooling liquid finally enters the liquid collection tank 402, and then is delivered to the water distributor 401 again by the liquid delivery pump 403, and circulates back and forth. When the ambient temperature of the external space is low, the cooling liquid in the liquid collection tank 402 may be frozen. After the external circulation airflow leaves the cold flow channel of the core assembly 2, it is directly blown to the liquid collection tank 402 to thaw the cooling liquid, thereby solving the freezing problem of the unit at low temperatures, without the need to pour out the cooling liquid in advance, and reducing resource waste.

[0077] Optionally, a filter screen 9 is provided in the return air chamber 101 and is located obliquely above the core assembly 2 , so as to prevent the cabinet circulating airflow 7 from carrying debris into the heat flow channel and blocking the heat flow channel.

[0078] Optionally, the cooling liquid may be water, cooling oil or other cooling media.

[0079] In this embodiment, the core assembly 2 includes a plurality of heat exchange cores, and each of the heat exchange cores is arranged in sequence along the length direction in a manner that the axes overlap; that is, each heat exchange core is arranged along the length direction of the shell 1, which reduces the resistance of air passing through the core assembly 2 compared to arranging along the width direction, and reduces the energy consumption of the fan. When the width dimension of the shell 1 is limited, increasing the length dimension of the core assembly 2 is conducive to the expansion of large cooling capacity, and does not change the space for unit maintenance in the width direction, which is conducive to the maintenance of the unit; compared with increasing the width dimension of the core assembly 2, increasing the length dimension reduces the air flow resistance and reduces the power consumption of the fan.

[0080] In this embodiment, see Figure 3 The exhaust chamber 104 is provided with a direct air inlet connected to the outside space, and an openable and closable direct air valve 10 is provided at the direct air inlet. When the direct air inlet valve 10 is closed, the fresh air from the outside space must pass through the fresh air chamber 103 and the cold flow channel before entering the exhaust chamber 104. When the direct air inlet valve 10 is opened, the fresh air from the outside space can directly enter the exhaust chamber 104 through the direct air inlet without passing through the fresh air chamber 103 and the cold flow channel, which is beneficial to reducing the pressure drop of the fresh air entering and exiting the shell 1.

[0081] The indirect evaporative cooling device provided in this embodiment has the beneficial effect that an openable and closable direct air valve 10 is provided at the exhaust chamber 104. When the ambient temperature is too high, the direct air valve 10 can be directly opened to introduce fresh air into the exhaust chamber 104. On the one hand, it can absorb the heat released by the condenser 302, and on the other hand, it can reduce the pressure drop caused by the fresh air flowing through the core assembly 2, thereby effectively improving the energy efficiency ratio of the unit.

[0082] Example 2

[0083] See also Figure 4 This embodiment proposes a control method, which is as described in Example 1. Figure 2 and Figure 3 The indirect evaporative cooling device shown is implemented, which includes the following steps:

[0084] S10: Obtaining the ambient temperature T ring of the external space;

[0085] S20: Controlling the working states of the spray system 4, the refrigeration system 3 and the direct air inlet valve 10 according to the ambient temperature.

[0086] Specifically, step S20 can be refined as follows:

[0087] S201: When the ambient temperature T_ring < T1, turn off the spray system 4, the refrigeration system 3, and the direct intake air valve 10;

[0088] S202: When T1 < T_ring < T2, turn on the spray system 4, and turn off the refrigeration system 3 and the direct intake air valve 10;

[0089] S203: When T2 < T_ring < T3, turn on the spray system 4 and the refrigeration system 3, and turn off the direct intake air valve 10;

[0090] S204: When T_ring ≥ T_return, turn off the spray system 4, turn on the refrigeration system 3, and open the direct intake air valve 10.

[0091] Among them,

[0092] T_ring: The ambient temperature of the external space;

[0093] T_return: The return air temperature of the return air chamber 101;

[0094] T1, T2, and T3: Are all preset temperature thresholds, and T1 < T2 < T3 ≤ T_return.

[0095] It should be noted that as Figure 2 shown, when T_ring < T1, it indicates that the current ambient temperature is very low, and the temperature difference between the fresh air and the air temperature inside the cabinet is large. At this time, even if the spray system 4 and the refrigeration system 3 are turned off, relatively efficient heat exchange can be achieved simply by relying on the temperature difference between the cabinet circulation air flow 7 and the external circulation air flow 8. Therefore, the spray system 4 and the refrigeration system 3 can be directly turned off, and at the same time, the direct intake air valve 10 is closed so that the fresh air must pass through the core component 2 to provide cold for the cabinet circulation air flow 7 in the heat flow channel. Since the spray system 4 and the refrigeration system 3 are turned off, the energy consumption of the whole machine is relatively low.

[0096] When T1 < T_ring < T2, it indicates that the current ambient temperature is relatively low, and the temperature difference between the fresh air and the air temperature inside the cabinet is relatively large. At this time, only the spray system 4 can be turned on to increase the cold supply, and there is no need to turn on the refrigeration system 3. After the spray system 4 is turned on, when the fresh air enters the cold flow channel, it will also carry the cooling liquid and flow forward. That is, the flow direction of the external circulation air flow 8 in the cold flow channel is the same as the flow direction of the cooling liquid, which is conducive to forming a uniform and stable liquid film in the cold flow channel. This liquid film, on the one hand, reduces the air resistance between the external circulation air flow 8 and the cold flow channel, thereby reducing the energy consumption of the exhaust fan 6; on the other hand, it makes the heat and moisture exchange between the external circulation air flow 8 and the cooling liquid more sufficient, improving the heat exchange efficiency.

[0097] When T2 < T_ring < T3, it indicates that the current ambient temperature is relatively high, and the temperature difference between the fresh air and the air temperature inside the cabinet is small. At this time, simply using the spray system 4 will result in insufficient cooling. Therefore, it is necessary to turn on both the spray system 4 and the refrigeration system 3 simultaneously. After adding the refrigeration system 3, the cabinet circulation air flow 7 can not only absorb the cold from the fresh air in the core component 2, but also absorb the cold from the evaporator 304 in the air supply chamber 102, undergoing a secondary cooling process, effectively ensuring that the servers inside the cabinet can achieve good heat dissipation. At the same time, after the external circulation air flow 8 leaves the core component 2, it can also be used to absorb the heat released by the condenser 302, realizing the effective utilization of the cold in the air flow, improving the comprehensive energy utilization efficiency, and thus reducing the energy efficiency ratio of the whole machine.

[0098] Optionally, T3 can be directly taken as T_return, that is, when T2 < T_ring < T_return, the spray system 4 and the refrigeration system 3 are turned on, and the direct inlet air valve 10 is closed. Such a value can eliminate the setting of T3, reduce the number of custom parameters, and improve the system operation speed.

[0099] When T_ring ≥ T_return, it indicates that the temperature of the fresh air is close to or higher than the temperature of the cabinet circulation air flow 7. At this time, continuing to use the core component 2 for heat exchange between the external circulation air flow 8 and the cabinet circulation air flow 7 is meaningless. Instead, it will increase the pressure drop of the external circulation air flow 8 because the external circulation air flow 8 passes through the core component 2, resulting in an increase in the energy consumption of the whole machine. As Figure 3 shown, at this time, the spray system 4 can be closed, the refrigeration system 3 can be turned on, and the direct inlet air valve 10 can be opened. After opening the direct inlet air valve 10, for the external circulation air flow 8, a large amount of fresh air basically enters the exhaust chamber 104 directly through the direct inlet. At this time, the main purpose of introducing fresh air into the housing 1 is to absorb the heat released by the condenser 302; for the cabinet circulation air flow 7, the cabinet circulation air flow 7 passes through the core component 2 and exchanges heat with the evaporator 304 in the return air chamber 101 to obtain cooling. It can be understood that after opening the direct inlet air valve 10, the pressure drop of the external circulation air flow 8 entering and leaving the housing 1 can be significantly reduced, thereby reducing the energy consumption of the whole machine and improving the energy efficiency ratio of the whole machine.

[0100] Furthermore, the ambient temperature T_ring can consider both the ambient dry bulb temperature and the ambient wet bulb temperature. The following is an example with specific data for illustration:

[0101] If the ambient dry bulb temperature ≤ 16°C, then natural heat exchange in the dry mode, and the spray system 4, the refrigeration system 3, and the direct inlet air valve 10 are closed;

[0102] If the ambient dry bulb temperature > 16°C and the ambient wet bulb temperature ≤ 18°C, then the spray system 4 is turned on for heat exchange in the wet mode;

[0103] If the ambient wet-bulb temperature is greater than 18°C ​​and the ambient wet-bulb temperature is less than 35°C, the spray system 4 and the refrigeration system 3 are turned on to perform mixed mode heat exchange;

[0104] If the ambient wet bulb temperature is greater than 35°C (assuming the return air temperature is 35°C), the direct air inlet valve 10 and the refrigeration system 3 are opened, and the spray system 4 is closed. At this time, the energy efficiency ratio may be greater than the mixed mode because the resistance of the exhaust fan is reduced. When the ambient air wet bulb temperature is greater than 35°C, it is meaningless to use the spray system 4, but it will increase the return air temperature, and the water pump will consume energy.

[0105] It is understandable that throughout the year, the return air temperature is 35°C, and the number of days or duration when the ambient temperature is greater than 35°C is relatively small.

[0106] The control method provided in this embodiment has the beneficial effect of automatically configuring the working states of the spray system 4, the refrigeration system 3 and the direct air inlet valve 10 according to the ambient temperature, thereby minimizing the comprehensive energy consumption of the unit and improving the energy efficiency ratio of the whole machine while ensuring sufficient cooling supply.

[0107] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0108] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An indirect evaporative cooling device, characterized in that: It comprises a shell (1), a core assembly (2), a refrigeration system (3) and a water distributor (401); The core assembly (2) is located inside the shell (1), and divides the internal space of the shell (1) into a return air chamber (101), an air supply chamber (102), a fresh air chamber (103), and an exhaust air chamber (104); The refrigeration system (3) comprises an evaporator (304) located in the air supply cavity (102) and a condenser (302) located in the air exhaust cavity (104); The exhaust cavity (104) is provided with a direct air inlet communicating with the external space, and the direct air inlet is provided with an openable and closable direct air valve (10); The water distributor (401) is located in the fresh air cavity (103) and is located obliquely above the core assembly (2), and is used to spray cooling liquid flowing from the fresh air cavity (103) toward the exhaust cavity (104) toward the core assembly (2); The core component (2) is provided with a hot flow channel and a cold flow channel; The return air chamber (101) and the supply air chamber (102) are connected via the hot flow channel, and the fresh air chamber (103) and the exhaust air chamber (104) are connected via the cold flow channel; A liquid collecting tank (402) is provided in the exhaust cavity (104); The liquid collecting tank (402) is located obliquely below the core assembly (2) and is used to collect the cooling liquid flowing out of the cold flow channel; A liquid delivery pump (403) is provided in the exhaust chamber (104); the inlet of the liquid delivery pump (403) is communicated with the liquid collecting tank (402), and the outlet is communicated with the water distributor (401); The refrigeration system (3) further comprises a compressor (301) and a throttling device (303) located in the exhaust chamber (104); the compressor (301), the condenser (302), the throttling device (303) and the evaporator (304) are connected in sequence; The core assembly (2) comprises a plurality of heat exchange cores, and each of the heat exchange cores is arranged in sequence along the length direction in a manner such that their axes coincide.

2. The indirect evaporative cooling device according to claim 1, characterized in that: The evaporator (304) is located obliquely below the core assembly (2).

3. The indirect evaporative cooling device according to claim 1, characterized in that: A filter screen (9) is provided in the return air chamber (101), and the filter screen (9) is located obliquely above the core assembly (2).

4. A control method, performed by the indirect evaporative cooling device according to any one of claims 1 to 3, characterized in that: include: When T ring ≥ T return, open the direct air inlet valve (10); in, T ring: ambient temperature of the external space; Treturn: return air temperature of the return air chamber (101); When T ring < T1, the spray system (4), the refrigeration system (3) and the direct air inlet valve (10) are closed; When T1<T ring<T2, the spray system (4) is turned on, and the refrigeration system (3) and the direct air inlet valve (10) are turned off; When T2<T ring<T3, the spray system (4) and the refrigeration system (3) are turned on, and the direct air inlet valve (10) is closed; in, T1, T2 and T3: are all preset temperature thresholds, and T1<T2<T3≤T back.

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