Indirect evaporative cooling unit and control method

Abstract

The invention discloses an indirect evaporative cooling unit and a control method. The unit comprises a heat exchange system; the spraying system comprises a spraying water storage tank, and the spraying water storage tank is connected with a water supplementing pipe used for supplying water; the humidifying system comprises a humidifying water storage tank, and a liquid inlet of the humidifying water storage tank can be communicated with the water supplementing pipe; wherein a water receiving piece used for collecting condensate water of the heat exchange system is arranged on the lower side of the heat exchange system, the liquid inlet can be further communicated with the water receiving piece, and the humidifying water storage tank can be communicated with the spraying water storage tank so as to supplement water into the spraying water storage tank. Humidification and spraying share one set of water supplementing / draining system, equipment such as a water pipe and a water pump does not need to be additionally arranged for the humidification system, and the operation cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of computer room air conditioning, and in particular to an indirect evaporative cooling unit and a control method thereof. Background Art

[0002] The indirect evaporative cooling unit uses the cooling effect of the lower temperature outdoor air and / or the compressor mode to exchange heat with the air in the machine room, taking away the heat in the machine room. When the outdoor temperature is low and the temperature of the heat exchange core or the evaporator wall is lower than the dew point temperature of the indoor air, condensation water will be produced.

[0003] During the implementation of the present invention, the inventor discovered that when the ambient temperature and the room temperature change relatively, the amount of condensed water generated by the heat exchange core and / or the evaporator will also change, resulting in excessive condensed water or the amount of condensed water failing to meet the humidification requirements. In this case, it is necessary to additionally arrange water pipes, water pumps, water treatment equipment and other water replenishment / drainage systems on the humidification device to discharge excess condensed water or replenish water to meet the humidification requirements. The humidification device and the spraying device are two independent water replenishment / drainage systems, which occupy additional space in the unit and increase the operating cost of the unit.

[0004] Therefore, in view of the above technical problems, how to make humidification and spraying share a set of water supply / drainage system is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the present application is to provide an indirect evaporative cooling unit and a control method, so that humidification and spraying share a water supply / drainage system without the need for additional configuration.

[0006] To achieve the above object, the present application provides an indirect evaporative cooling unit, comprising:

[0007] Heat exchange system;

[0008] A spray system, comprising a spray water storage tank, wherein the spray water storage tank is connected to a water replenishing device for supplying water;

[0009] A humidification system, comprising a humidification water storage tank, wherein a liquid inlet of the humidification water storage tank can be communicated with the water replenishing device to replenish water into the humidification water storage tank;

[0010] Among them, a water receiving part for collecting condensed water is provided on one side of the heat exchange system, the liquid inlet can also be connected to the water receiving part, and the humidification water storage tank can be connected to the spray water storage tank to replenish water into the spray water storage tank.

[0011] Preferably, the heat exchange system comprises a heat exchange core and an evaporator arranged on the indoor air outlet side of the heat exchange core, and the water receiving piece is arranged on the lower side of the heat exchange system for collecting condensed water from the heat exchange core and / or the evaporator.

[0012] Preferably, the humidification system further comprises a humidifier arranged at the air outlet side of the evaporator, the input end of the humidifier is connected to the liquid outlet of the humidification water storage tank through a humidification pipe, and a humidification water pump is provided on the humidification pipe.

[0013] Preferably, the spray system further comprises a spray water outlet pipe connected to the spray water storage tank, the spray water outlet pipe is provided with a spray water pump and a spray head, and the spray head sprays toward the heat exchange core.

[0014] Preferably, the humidification water storage tank is arranged at the lower side of the water receiving part, and the liquid inlet includes a first inlet and a second inlet, the first inlet is connected to the water receiving part through a condensate drain pipe, and the condensate drain pipe is provided with a first drain valve, and the second inlet is connected to the water replenishment pipe of the water replenishment device through a water replenishment inlet pipe, and the water replenishment inlet pipe is provided with a humidification water replenishment valve.

[0015] Preferably, the humidification water replenishment valve is a three-way valve, the first end and the second end of the three-way valve are connected to the water replenishment inlet pipe, and the third end of the three-way valve is connected to the water receiving member.

[0016] Preferably, the spray water storage tank is arranged at the lower side of the humidification water storage tank, a connecting pipe connected to the spray water storage tank is provided at the bottom of the humidification water storage tank, and a second drain valve is provided on the connecting pipe.

[0017] Preferably, the heat exchange system further comprises:

[0018] A condenser is arranged at the outdoor air outlet side of the heat exchange core, and the spray head is arranged between the condenser and the heat exchange core;

[0019] An outdoor fan, arranged at the air outlet side of the condenser, for exhausting air to the outdoors;

[0020] An indoor fan, arranged at the air outlet side of the evaporator, for exhausting air to the output end of the humidifier and supplying air to the room;

[0021] The compressor is connected to the condenser and the evaporator to form a refrigerant circulation loop of the air-conditioning system.

[0022] Preferably, the heat exchange core comprises two symmetrically distributed rhombus cores, the two rhombus cores are arranged at an angle, the evaporator is arranged on the side of the rhombus core inclined downward, the condenser is arranged on the side of the rhombus core inclined upward, and the evaporator and the condenser are arranged on two adjacent surfaces of the rhombus core.

[0023] Preferably, the water receiving piece is arranged at the lowest corner of the rhombus core and corresponds to at least the lowest side of the evaporator in the vertical direction. The number of the water receiving pieces is consistent with the number of the heat exchange cores and corresponds one to one. The condensed water of the heat exchange core and the condensed water of the evaporator are collected at the lowest corner under the action of gravity.

[0024] A control method, applied to the above-mentioned indirect evaporative cooling unit, comprises:

[0025] Acquire the amount of condensed water in the heat exchange system within a preset time, and determine the relationship between the amount of condensed water and the humidification water consumption of the humidification system;

[0026] Based on the size relationship, on-off control is performed between the humidification water storage tank and the water replenishment device, and between the humidification water storage tank and the spray water storage tank;

[0027] The humidification system of the indirect evaporative cooling unit is operated and controlled based on the humidification demand.

[0028] Preferably, the step of obtaining the amount of condensed water in the heat exchange system within a preset time and determining the relationship between the amount of condensed water and the amount of humidification water in the humidification system includes:

[0029] The humidification water storage tank is connected to the water receiving member, and after the preset time of connection, the amount of condensed water entering the humidification water storage tank from the water receiving member is obtained;

[0030] If the amount of condensed water reaches a preset high level in the humidification water storage tank, the amount of condensed water is greater than or equal to the amount of humidification water;

[0031] If the water level of the condensed water in the humidification water storage tank does not reach a preset high level, the condensed water amount is less than the humidification water amount.

[0032] Preferably, the operation control of the humidification system of the indirect evaporative cooling unit based on the humidification demand includes:

[0033] When there is a need for humidification, if the water level of the humidification water tank reaches a preset high level, the humidification system is controlled to start running; if the water level of the humidification water tank does not reach the preset high level, the humidification water tank and the water replenishing device are controlled to be connected so that the water replenishing device replenishes water to the humidification water tank, and when the water level of the humidification water tank reaches the preset high level after replenishment, the humidification system is controlled to start running.

[0034] Preferably, the operation control of the humidification system of the indirect evaporative cooling unit based on the humidification demand further includes:

[0035] When there is no humidification demand, if the water level of the humidification water storage tank reaches a preset high level, the humidification water storage tank and the spray water storage tank are controlled to be connected so that the humidification water storage tank replenishes water to the spray water storage tank.

[0036] Compared with the prior art, the technical solution provided by this application has at least the following beneficial effects:

[0037] When the heat exchange system generates too much condensed water, the condensed water in the humidification water storage tank can be used as humidification water on the one hand, and as reserve water for the spray system on the other hand. By opening the connecting channel between the humidification water storage tank and the spray water storage tank, the condensed water can be drained into the spray water storage tank to prevent the humidification water storage tank from overflowing; when the heat exchange system generates too little condensed water and cannot meet the humidification water demand of the humidification system, the humidification water storage tank can be replenished through the water replenishment device to meet different humidification needs. The humidification system of the present application can share a set of water replenishment devices with the spray system, and can drain water to the spray water storage tank of the spray system, thereby achieving the purpose of sharing a set of water replenishment / drainage systems for humidification and spraying, without occupying additional unit space and reducing the unit operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application 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 embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0039] FIG1 is a schematic diagram of the structure of an indirect evaporative cooling unit provided in an embodiment of the present application.

[0040] In the figure: 1-heat exchange system; 11-heat exchange core; 12-evaporator; 13-condenser; 14-outdoor fan; 15-indoor fan;

[0041] 2-spraying system; 21-spraying water storage tank; 22-spraying water pump; 23-spraying water outlet pipe; 24-water receiving parts; 25-spraying head;

[0042] 3-humidification system; 31-humidifier; 32-humidification water storage tank; 33-humidification water supply valve; 34-condensation water drain pipe; 35-first drain valve; 36-humidification water pump; 37-water level switch; 38-humidification pipe; 39-water supply inlet pipe;

[0043] 4-Water supply pipe;

[0044] 5-Connecting pipe;

[0045] 6- Second drain valve;

[0046] 7-Water supply valve;

[0047] 8- Pressure gauge. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] As shown in FIG1 , an indirect evaporative cooling unit is provided in this embodiment, and the unit includes a heat exchange system 1, a spray system 2, and a humidification system 3. The heat exchange system 1 includes a heat exchange core 11 and an evaporator 12 arranged on the indoor air outlet side of the heat exchange core 11. The high-temperature indoor return air of the computer room passes through the heat exchange core to exchange heat with the air from the outside, and then passes through the evaporator 12 (compressor mode, which can be turned on according to demand) to exchange heat again, and is sent to the computer room to cool the server.

[0052] The spray system 2 includes a spray head 25 for spraying the heat exchange core 11 and a water receiving part 24 located at the lower side of the heat exchange system 1. After the outdoor incoming air enters the heat exchange core 11, the heat exchange core 11 can be cooled by the spray system 2, thereby cooling the outdoor incoming air and improving the heat exchange efficiency between the outdoor incoming air and the indoor return air in the heat exchange core 11.

[0053] The water receiving piece 24 can collect condensed water of the heat exchange system 1. Specifically, when the outdoor temperature is low, condensed water will be generated on the heat exchange core 11 and the evaporator 12. When the condensed water gathers to a certain level, it will flow downward along the heat exchange core 11 and the evaporator 12 under the action of gravity and finally flow into the water receiving piece 24.

[0054] The spray system 2 includes a spray water replenishment tank 21, which is connected to a water replenishment device for water supply. The liquid outlet of the water replenishment device is provided with a water replenishment pipe 4. When there is a greater demand for spraying, the water replenishment pipe 4 can provide sufficient stored water to the spray system 2 to ensure the spraying effect.

[0055] The humidification system 3 includes a humidifier 31 disposed on the air outlet side of the evaporator 12. The indoor air outlet side of the heat exchange core 11 passes through the evaporator 12 and then passes through the humidifier 31. The machine room is humidified by the humidifier 31. Of course, the humidifier can also directly humidify the machine room without passing through the evaporator 12, and no more restrictions are made here. The humidifier 31 can be a wet film humidifier. The input end of the humidifier 31 is connected to a humidification water tank 32. Please refer to Figure 1. A water level switch 37 is provided in the humidification water tank 32. The water level switch 37 includes a high-level switch disposed at a high position and a low-level switch disposed at a low position, which are respectively used to detect the water level in the humidification water tank 32.

[0056] The humidifying water tank 32 is provided with a liquid inlet, and the liquid inlet of the humidifying water tank 32 can be connected to the water replenishing pipe 4. At the same time, the liquid inlet of the humidifying water tank 32 can also be connected to the water receiving part 24; in addition, the humidifying water tank 32 can be connected to the spray water tank 21 to replenish water into the spray water tank 21.

[0057] Based on the above embodiments, when the heat exchange system 1 generates too much condensed water, the condensed water in the humidification water storage tank 32 can be used as humidification water on the one hand, and as reserve water for the spray system 2 on the other hand. By opening the connecting channel between the humidification water storage tank 32 and the spray water storage tank 21, the water is drained into the spray water storage tank 21 to prevent the humidification water storage tank 32 from overflowing; when the heat exchange system 1 generates too little condensed water, the humidification water storage tank 32 cannot meet the humidification water demand of the humidification system 3, and the water replenishment device can be used to replenish water to the humidification water storage tank 32 to meet different humidification needs. The humidification system 3 of the present application can share a set of water replenishment devices with the spray system 2, and can also drain water to the spray water storage tank 21 of the spray system 2, thereby achieving the purpose of sharing a set of water replenishment / drainage systems for humidification and spraying, without occupying additional unit space, and reducing the unit operating cost.

[0058] The input end of the humidifier 31 is connected to the liquid outlet of the humidification water tank 32 through a humidification pipe 38, and a humidification water pump 36 is provided on the humidification pipe 38. When there is a humidification demand in the machine room, if the water level in the humidification water tank 32 meets the humidification water requirement, the humidification water pump 36 and the humidifier 31 can be started to humidify the machine room.

[0059] Similarly, the spray system 2 also includes a spray outlet pipe 23 connecting the spray water storage tank 21 and the spray head 25. The spray water storage tank 21 is used as a water storage component of the spray system 2. The outlet of the spray water storage tank 21 is provided with a spray outlet pipe 23, which is connected to the spray head 25, so as to provide a continuous and stable water supply for the spray head 25. The spray outlet pipe 23 is provided with a spray water pump 22 to provide spraying power for the spray head 25. The inlet of the spray water storage tank 21 is provided with a water supply pipe 4, through which the customer's water can be connected externally, and a corresponding water supply valve 7 is provided on the water supply pipe 4 to control the on and off of the water supply pipe 4. At the same time, a pressure gauge 8 can be provided on the water supply pipe 4 to monitor the water supply pressure in the water supply pipe 4. If the amount of spray water generated by the spray head 25 is large, after completing the heat exchange with the heat exchange core 11, it can be collected through an external water receiving device and recycled through the water inlet of the water supply pipe 4.

[0060] In addition, the humidification water storage tank 32 is arranged at the lower side of the water receiving part 24. When the humidification water storage tank 32 and the water receiving part 24 are in communication, the condensed water in the water receiving part 24 will be drained into the humidification water storage tank 32 under the action of gravity. The liquid inlet of the humidification water storage tank 32 includes a first inlet and a second inlet. The first inlet is connected to the water receiving part 24 through a condensed water drainage pipe 34. The condensed water drainage pipe 34 is provided with a first drainage valve 35. The second inlet is connected to the replenishment water pipe 4 through a replenishment water inlet pipe 39. The replenishment water inlet pipe 39 is provided with a humidification replenishment water valve 33 to control the on-off of the replenishment water inlet pipe 39. It should be pointed out that since a replenishment water pump is provided on the replenishment water pipe 4, water can be selectively replenished into the spray water storage tank 21 and the humidification replenishment water tank according to the on-off of the replenishment water valve 7 on the replenishment water pipe 4 and the on-off of the humidification replenishment water valve 33 on the replenishment water inlet pipe 39.

[0061] The spray water tank 21 is arranged at the lower side of the humidifying water tank 32. A connecting pipe 5 connected to the spray water tank 21 is provided at the bottom of the humidifying water tank 32. A second drain valve 6 is provided on the connecting pipe 5. Since the spray water tank 21 is arranged at the lower side of the humidifying water tank 32, when the second drain valve 6 is opened, the stored water in the humidifying water tank 32 will be replenished into the spray water tank 21 under the action of gravity.

[0062] When there is a humidification demand in the machine room, but the condensed water collected by the water receiving part 24 cannot meet the humidification demand, the humidification water replenishment valve 33 can be opened to replenish water into the humidification water tank 32 to meet the humidification demand; if there is no humidification demand in the machine room, in order to prevent the condensed water from overflowing in the humidification water tank 32, the connecting channel between the humidification water tank 32 and the spray water tank 21 can be opened to lower the water level in the humidification water tank 32 to prevent the humidification water tank 32 from overflowing; at the same time, a certain water level can be retained in the humidification water tank 32 so that when the humidification system 3 is started next time, the humidification water tank 32 has a water amount that can meet the humidification demand.

[0063] If the amount of condensed water collected by the water receiving part 24 is large, for example, in winter when the outdoor temperature is low, a large amount of condensed water will be generated on the outer wall of the heat exchange core 11. At this time, the amount of condensed water will meet the humidification demand while there will be some surplus. In the related art, it is usually directly discharged to the outside, resulting in a waste of water resources. However, in this embodiment, the condensed water can be discharged to the humidification water storage tank 32 through the water receiving part 24, and according to the water level in the humidification water storage tank 32, the communication channel between the humidification water storage tank 32 and the spray water storage tank 21 is selectively opened to reduce the water level in the humidification water storage tank 32, and the humidification water storage tank 32 can be used as a reserve water for the spray system 2.

[0064] In some embodiments, the humidification water replenishment valve 33 can be an electric three-way valve. Please refer to Figure 1. The first end and the second end of the three-way valve are connected to the water replenishment inlet pipe 39 to control the connection and disconnection between the humidification water storage tank 32 and the water replenishment device. The third end of the three-way valve is connected to the water receiving part 24 to control the humidification water storage tank 32 to be connected to the water receiving part 24 through the three-way valve. When the amount of condensed water is large and the water replenishment inlet pipe 39 is not needed to replenish water, the second inlet of the humidification water storage tank 32 can be controlled by the three-way valve to be connected to the water receiving part 24, thereby improving the efficiency of draining condensed water into the humidification water storage tank 32. When the water replenishment inlet pipe 39 is needed to replenish water into the humidification water storage tank 32, the second inlet of the humidification water storage tank 32 is connected to the water replenishment pipe 4, and the second inlet is disconnected from the water receiving part 24.

[0065] The heat exchange system 1 also includes a condenser 13, an outdoor fan 14, an indoor fan 15 and a compressor. The condenser 13 is arranged at the outdoor air outlet side of the heat exchange core 11, and the spray head 25 is arranged between the condenser 13 and the heat exchange core 11. When the outdoor air passes through the heat exchange core 11, it will exchange heat with the indoor return air in the heat exchange core 11. It should be noted that there are independent outdoor air channels and outdoor air channels in the heat exchange core 11. The outdoor air enters the outdoor air channel from the outdoor air inlet side and is discharged from the outdoor air outlet side, and then passes through the condenser 13 for heat exchange (compressor mode), and is discharged to the outdoor environment through the outdoor fan 14; the indoor air enters the indoor air channel from the indoor return air side, exchanges heat with the outdoor air in the heat exchange core 11, and is discharged from the indoor air inlet side after heat exchange, and then supplies air to the room through the evaporator 12 and the indoor fan 15. Therefore, the indoor air and the outdoor air will not be mixed when they are heat exchanged in the heat exchange core 11. At the same time, the humidifier 31 is arranged on the air outlet side of the evaporator 12, so the indoor fan 15 can also act on the output end of the humidifier 31, thereby improving the humidification efficiency of the machine room. The compressor (not shown in the figure) is connected to the condenser 13 and the evaporator 12 to form a refrigerant circulation loop of the air conditioning system. Of course, the air conditioning system also includes components such as an electronic expansion valve, and the specifics can be referred to the air conditioning system in the prior art, which will not be repeated here.

[0066] In some embodiments, the heat exchange core 11 is a double-core rhombus distribution, specifically, the heat exchange core 11 includes two symmetrically distributed rhombus cores, specifically refer to Figure 1, one corner of the rhombus core is located at the bottom, in one rhombus core, the evaporator 12 is arranged on the side of the rhombus core that is inclined downward, the condenser 13 is arranged on the side of the rhombus core that is inclined upward, and the evaporator 12 and the condenser 13 are arranged on two adjacent surfaces of the rhombus core. On this basis, the water receiving piece 24 is arranged at the bottom corner of the rhombus core, and corresponds to at least the bottom side of the evaporator 12 in the vertical direction, so that the condensed water and spray water of the heat exchange core 11 are collected at the bottom corner under the action of gravity, and the condensed water of the evaporator 12 is collected at the bottom side of the evaporator 12 under the action of gravity, and then flows back to the water receiving piece 24. Among them, the number of water receiving pieces 24 is consistent with the number of heat exchange cores 11 and corresponds one to one.

[0067] The present application also includes a control system, which can determine whether to turn on the heat exchange system 1 and / or the spray system 2 based on the comparison of the preset switching point temperature with the outdoor dry-bulb temperature and the outdoor wet-bulb temperature. Specifically, the preset switching point temperature includes a dry switching point temperature and a spray switching point temperature. The dry switching point temperature is the preset temperature when the unit switches to the dry mode, and the spray switching point temperature is the preset temperature when the unit switches to the mixed mode. The outdoor dry-bulb temperature is the temperature measured by a thermometer freely exposed to the air, and the outdoor wet-bulb temperature is the temperature when the surface temperature of the gauze of the wet-bulb thermometer reaches saturation.

[0068] When the outdoor temperature is low, the outdoor dry-bulb temperature is less than the dry switching point temperature, and the unit operates in dry mode. At this time, the spray system 2 and the heat exchange system 1 do not operate, and the cooling demand can be met by relying on the heat exchange of the heat exchange core 11.

[0069] When the outdoor temperature is equivalent to the room temperature, the dry switching point temperature ≤ the outdoor wet-bulb temperature < the spray switching point temperature, and the unit operates in wet mode. At this time, the spray system 2 operates and the heat exchange system 1 does not operate. The heat exchange capacity of the heat exchange core 11 is increased by spraying to meet the cooling demand.

[0070] When the outdoor temperature is much higher than the room temperature, the outdoor wet-bulb temperature is ≥ the spray switching point temperature, and the unit operates in mixed mode. At this time, both the spray system 2 and the heat exchange system 1 are in operation, and the cooling demand is met through the heat exchange core 11 and the compressor mode.

[0071] It should be pointed out that whether the heat exchange system 1 is running or not, the heat exchange core 11 is in use, that is, the operation or non-operation of the heat exchange system 1 mentioned above refers to the operation or non-operation of the compressor in the compressor mode.

[0072] For the three operation modes of the above-mentioned units, it is necessary to determine whether the machine room has a humidification demand, so as to selectively start the humidification system 3 according to the humidification demand. However, no matter what operation mode the unit is in, it is also necessary to determine the amount of condensed water generated by the heat exchange system 1. If the amount of condensed water is too much, so that when there is a humidification demand, the humidification water consumption of the humidification system 3 is less than the condensed water, then the condensed water needs to be drained from the humidification water storage tank 32 to the spray water storage tank 21, so as to ensure that the humidification water storage tank 32 can meet the water needs of the humidifier 31 while avoiding overflow of the humidification water storage tank 32, and can also be used as reserve water for the spray water storage tank 21, so as to provide spray water for the spray system 2.

[0073] If the amount of condensed water is too small, so that when there is a humidification demand, the humidification water consumption of the humidification system 3 is greater than the condensed water consumption, it is necessary to replenish water into the humidification water tank 32 through the water replenishment inlet pipe 39 and the water replenishment pipe 4 to meet the humidification water demand of the humidification system 3.

[0074] In addition, when there is no need for humidification in the machine room, the humidification water tank 32 is still connected to the water receiving piece 24 to collect condensed water, but in order to avoid overflow of the humidification water tank 32, water can still be discharged into the spray water tank 21 through the connecting pipe 5.

[0075] The present application also provides a control method for the above-mentioned indirect evaporative cooling unit, including:

[0076] Acquire the amount of condensed water in the heat exchange system 1 within a preset time, and determine the relationship between the amount of condensed water and the amount of humidification water in the humidification system 3;

[0077] Based on the size relationship, the humidification water storage tank 32 and the water supply pipe 4, and the humidification water storage tank 32 and the spray water storage tank 21 are controlled on and off;

[0078] The humidification system 3 of the indirect evaporative cooling unit is operated and controlled based on the humidification demand.

[0079] Among them, when obtaining the amount of condensed water of the heat exchange system 1 within a preset time, the amount of condensed water generated by the heat exchange system 1 can also be pre-determined. For example, when the machine room is in dry mode, the temperature and humidity sensor on the indoor return air side and the outdoor temperature and humidity sensor are used to determine whether the outdoor dry-bulb temperature is lower than the dew point temperature of the machine room. If it is lower than the dew point temperature of the machine room, it means that the heat exchange system 1 will produce more condensed water; otherwise, less condensed water will be produced. When the machine room is in wet mode, the condition for determining how much condensed water is generated by the heat exchange system 1 is whether the outdoor wet-bulb temperature is lower than the dew point temperature of the machine room. If it is lower, more condensed water is generated, otherwise, less condensed water is generated. Similarly, when the machine room is in mixed mode, due to the operation of the compressor, the condition for determining how much condensed water is generated by the heat exchange system 1 is to determine whether the evaporation temperature of the evaporator 12 is lower than the dew point temperature of the machine room. If it is lower, more condensed water is generated, otherwise, less condensed water is generated.

[0080] In some embodiments, the amount of condensed water generated by the heat exchange system 1 can also be determined by the amount of condensed water entering the humidification water storage tank 32 from the water receiving member 24; specifically, the amount of condensed water in the heat exchange system 1 within a preset time is obtained, and the relationship between the amount of condensed water and the humidification water consumption of the humidification system 3 is determined, including:

[0081] The humidification water storage tank 32 is connected to the water receiving member 24, and after a preset time of connection, the amount of condensed water entering the humidification water storage tank 32 from the water receiving member 24 is obtained;

[0082] The water level switch 37 is used to detect whether the water level of the humidification water storage tank 32 has reached a preset high level. If it has reached the preset high level, it means that the amount of condensed water is greater than or equal to the amount of water used for humidification. At this time, the amount of condensed water generated by the heat exchange system 1 can meet the humidification demand of the humidification system 3, and no external water replenishment is required; if there is too much condensed water in the humidification water storage tank 32, it can be drained into the spray water storage tank 21 through the connecting pipe 5 to prevent the humidification water storage tank 32 from overflowing. If it has not reached the preset high level, it means that the amount of condensed water is less than the amount of water used for humidification, and the humidification water storage tank 32 is replenished through the water replenishment pipe 4 and the water replenishment inlet pipe 39 until it reaches the preset high level.

[0083] If the machine room has a humidification demand, after the water level in the humidification water storage tank reaches a preset high level, the humidification system 3 starts to run, the humidification water storage tank 32 supplies water to the input end of the humidifier 31, and the humidifier 31 is started to humidify the machine room.

[0084] If there is no humidification demand in the machine room, the humidification water consumption of the humidification system 3 is zero. Then, as the condensed water is gradually discharged into the humidification water tank 32, there will inevitably be a time point when the condensed water reaches a preset high level. When the condensed water reaches the preset high level, the humidification water tank 32 is connected to the spray water tank 21 to drain the condensation water tank and the spray water tank 21 to prevent the humidification water tank 32 from overflowing. As the condensed water is discharged to the spray water tank 21, it will reach a preset low level after a certain period of time. At this time, the humidification water tank 32 and the spray water tank 21 can be turned off to ensure that some condensed water remains in the humidification water tank 32, so that when there is a humidification demand next time, part of the water addition of the humidification system 3 can be met.

[0085] In addition, when the unit itself has a dehumidification demand, dehumidification can be performed by turning on the compressor. The compressor mode uses a dual electronic expansion valve, closing an expansion valve corresponding to the evaporator 12 to reduce the heat exchange area of ​​the evaporator 12, so that the evaporation temperature of the evaporator 12 is lower than the dew point temperature of the machine room, thereby dehumidifying the return air of the machine room.

[0086] It should be pointed out that the above-mentioned humidifier 31 can also be a constant humidity device, so that the unit has both dehumidification and humidification functions. The humidification system 3 and the spray system 2 share a water supply / drainage system, and there is no need to add additional water pipes, water pumps, water treatment equipment and other devices to the humidification system 3, thereby reducing the operating costs of the data center and reducing the waste of water resources and electricity. At the same time, the condensed water generated by the heat exchange system 1 is effectively utilized, so that the unit can ensure that the supply air humidity is maintained between 40% and 60% in different seasons and return air conditions, saving water resources and electricity resources and reducing the operating costs of the data center.

[0087] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0088] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An indirect evaporative cooling unit, characterized in that: include: Heat exchange system (1); A spray system (2), comprising a spray water storage tank (21), wherein the spray water storage tank (21) is connected to a water replenishing device for supplying water; A humidification system (3) comprising a humidification water storage tank (32), wherein a liquid inlet of the humidification water storage tank (32) can be communicated with the water replenishment device so as to replenish water into the humidification water storage tank (32); Wherein, a water receiving part (24) for collecting condensed water is provided on one side of the heat exchange system (1), the liquid inlet can also be connected to the water receiving part (24), and the humidification water storage tank (32) can be connected to the spray water storage tank (21) to replenish water into the spray water storage tank (21).

2. The indirect evaporative cooling unit according to claim 1, characterized in that: The heat exchange system (1) comprises a heat exchange core (11) and an evaporator (12) arranged on the indoor air outlet side of the heat exchange core (11); the water receiving member (24) is arranged on the lower side of the heat exchange system (1) and is used to collect condensed water from the heat exchange core (11) and / or the evaporator (12).

3. The indirect evaporative cooling unit according to claim 2, characterized in that: The humidification system (3) further comprises a humidifier (31) arranged on the air outlet side of the evaporator (12); the input end of the humidifier (31) is connected to the liquid outlet of the humidification water storage tank (32) via a humidification pipe (38); and a humidification water pump (36) is provided on the humidification pipe (38).

4. The indirect evaporative cooling unit according to claim 3, characterized in that: The spray system (2) further comprises a spray water outlet pipe (23) connected to the spray water storage tank (21), the spray water outlet pipe (23) being provided with a spray water pump (22) and a spray head (25), the spray head (25) spraying towards the heat exchange core (11).

5. The indirect evaporative cooling unit according to claim 1, characterized in that: The humidification water storage tank (32) is arranged at the lower side of the water receiving member (24); the liquid inlet comprises a first inlet and a second inlet; the first inlet is connected to the water receiving member (24) via a condensation water drainage pipe (34); a first drainage valve (35) is provided on the condensation water drainage pipe (34); the second inlet is connected to a water replenishment pipe (4) of the water replenishment device via a water replenishment inlet pipe (39); a humidification water replenishment valve (33) is provided on the water replenishment inlet pipe (39).

6. The indirect evaporative cooling unit according to claim 5, characterized in that: The humidification water replenishment valve is a three-way valve, the first end and the second end of the three-way valve are connected to the water replenishment inlet pipe, and the third end of the three-way valve is communicated with the water receiving member.

7. The indirect evaporative cooling unit according to claim 1, characterized in that: The spray water storage tank (21) is arranged at the lower side of the humidifying water storage tank (32), and a connecting pipe (5) connected to the spray water storage tank (21) is provided at the bottom of the humidifying water storage tank (32), and a second drain valve (6) is provided on the connecting pipe (5).

8. The indirect evaporative cooling unit according to claim 4, characterized in that: The heat exchange system (1) further comprises: A condenser (13) is arranged on the outdoor air outlet side of the heat exchange core (11); and the spray head (25) is arranged between the condenser (13) and the heat exchange core (11); An outdoor fan (14) is arranged on the air outlet side of the condenser (13) and is used to exhaust air to the outdoors; An indoor fan (15) is arranged on the air outlet side of the evaporator (12) and is used to exhaust air to the output end of the humidifier (31) and supply air to the room; The compressor is connected to the condenser (13) and the evaporator (12) to form a refrigerant circulation loop of the air conditioning system.

9. The indirect evaporative cooling unit according to any one of claims 2 to 8, characterized in that: The heat exchange core (11) comprises two symmetrically distributed rhombus cores, the two rhombus cores are arranged at an angle, the evaporator (12) is arranged on a side of the rhombus core that is inclined downward, the condenser (13) is arranged on a side of the rhombus core that is inclined upward, and the evaporator (12) and the condenser (13) are arranged on two adjacent surfaces of the rhombus core.

10. The indirect evaporative cooling unit according to claim 9, characterized in that: The water receiving member (24) is arranged at the lowest corner of the rhombus core and corresponds at least to the lowest side of the evaporator (12) in the vertical direction. The number of the water receiving members (24) is consistent with the number of the heat exchange core (11) and corresponds one to one. The condensed water of the heat exchange core (11) and the condensed water of the evaporator (12) are collected at the lowest corner under the action of gravity.

11. A control method, characterized in that: The indirect evaporative cooling unit according to any one of claims 1 to 10 comprises: Acquiring the amount of condensed water of the heat exchange system (1) within a preset time, and determining the relationship between the amount of condensed water and the amount of humidification water of the humidification system (3); Based on the size relationship, on-off control is performed between the humidifying water storage tank (32) and the water replenishing device, and between the humidifying water storage tank (32) and the spraying water storage tank (21); The humidification system (3) of the indirect evaporative cooling unit is operated and controlled based on the humidification demand.

12. The control method according to claim 11, characterized in that: The step of obtaining the amount of condensed water of the heat exchange system (1) within a preset time and determining the relationship between the amount of condensed water and the amount of humidification water of the humidification system (3) comprises: The humidification water storage tank (32) is in communication with the water receiving member (24), and after the connection is maintained for the preset time, the amount of condensed water entering the humidification water storage tank (32) from the water receiving member (24) is obtained; If the water level of the condensed water in the humidification water storage tank (32) reaches a preset high level, the condensed water amount is greater than or equal to the humidification water amount; If the water level of the condensed water in the humidification water storage tank (32) does not reach a preset high level, the condensed water amount is less than the humidification water amount.

13. The control method according to claim 12, characterized in that: The operation control of the humidification system (3) of the indirect evaporative cooling unit based on the humidification demand includes: When there is a need for humidification, if the water level of the humidification water storage tank (32) reaches a preset high level, the humidification system (3) is controlled to start operation; if the water level of the humidification water storage tank (32) does not reach the preset high level, the humidification water storage tank (32) and the water replenishing device are controlled to be connected so that the water replenishing device replenishes water to the humidification water storage tank (32), and when the water level of the humidification water storage tank (32) reaches the preset high level after replenishment, the humidification system (3) is controlled to start operation.

14. The control method according to claim 12, characterized in that: The method of controlling the operation of the humidification system (3) of the indirect evaporative cooling unit based on the humidification demand further comprises: When there is no humidification demand, if the water level of the humidification water storage tank (32) reaches a preset high level, the humidification water storage tank (32) and the spray water storage tank (21) are controlled to be connected so that the humidification water storage tank (32) replenishes water to the spray water storage tank (21).

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