Indirect evaporative cooling air conditioning unit and control method thereof

Abstract

The disclosure provides an indirect evaporative cooling air conditioning unit and a control method thereof, and belongs to the field of air conditioning systems. The indirect evaporative cooling air conditioning unit comprises a first air guide assembly, a second air guide assembly, an air heat exchanger and a control assembly. The first air guide assembly is in communication with a secondary side air inlet of the air heat exchanger. The second air guide assembly comprises at least two air guide modules in communication with each other, the at least two air guide modules are arranged in sequence along the length direction of a secondary side air outlet of the air heat exchanger, and are in communication with the secondary side air outlet respectively. The control assembly is located outside the air heat exchanger and is electrically connected with each air guide module. The control assembly is configured to control the air guide module to transport the airflow at the secondary side air outlet to the outside, or control the air guide module to receive the airflow transported by the adjacent air guide module and make the airflow backflow to the secondary side air inlet. The disclosure can avoid the problem of condensation.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the field of air conditioning systems, and particularly relates to an indirect evaporative cooling air conditioning unit and a control method thereof. BACKGROUND

[0002] The indirect evaporative cooling air conditioning unit is an air conditioning system applied to a data center, which is used to adjust the temperature inside the data center so that the electronic equipment in the data center can work stably at a suitable temperature.

[0003] In the related art, the indirect evaporative cooling air conditioning unit mainly includes a primary side fan, a secondary side fan, an air heat exchanger and a spraying system. The primary side fan is used to circulate the airflow inside the data center (primary side airflow), and the secondary side fan is used to circulate the airflow outside the data center (secondary side airflow). The air heat exchanger is located at the intersection of the air ducts of the primary side fan and the secondary side fan. Under the action of the spraying system and the secondary side fan, the primary side airflow can be sufficiently cooled in the process of flowing through the low-temperature air heat exchanger, thereby achieving the effect of adjusting the temperature inside the data center.

[0004] However, if the surface temperature of the air heat exchanger is too low, condensation (water vapor condenses on an object with a lower temperature when the water vapor reaches the saturation temperature in the air) will occur on the indoor side of the air heat exchanger, which not only increases the load of the indirect evaporative cooling air conditioning unit, but also has the risk of freezing and cracking of the air heat exchanger. SUMMARY

[0005] The embodiments of the present disclosure provide an indirect evaporative cooling air conditioning unit and a control method thereof, which can avoid the condensation problem. The technical solutions are as follows:

[0006] In a first aspect, the embodiments of the present disclosure provide an indirect evaporative cooling air conditioning unit, which comprises a first air guide assembly, a second air guide assembly, an air heat exchanger and a control assembly.

[0007] The first air guide assembly is located on one side of the air heat exchanger and is in communication with the secondary side air inlet of the air heat exchanger.

[0008] The second air guide assembly is located on the opposite side of the air heat exchanger. The second air guide assembly comprises at least two air guide modules that are in communication with each other. The at least two air guide modules are arranged in sequence along the length direction of the secondary side air outlet of the air heat exchanger and are in communication with the secondary side air outlet, respectively.

[0009] The control assembly is located outside the air heat exchanger and is electrically connected with each air guide module. The control assembly is configured to control a part of the air guide modules to deliver the airflow at the secondary side air outlet to the outside, and control another part of the air guide modules to receive the airflow delivered by the adjacent air guide modules and make the airflow backflow to the secondary side air inlet.

[0010] The technical scheme provided by the embodiments of the present disclosure has at least the following beneficial effects:

[0011] When the indirect evaporative cooling air conditioning unit is working, under the action of the air guide module, the air from the outside enters the air heat exchanger through the secondary side air inlet and is output from the secondary side air outlet to form the secondary side airflow. If the temperature of the secondary side air inlet is normal and the air heat exchanger does not have the possibility of dewing, the control assembly controls all the air guide modules to deliver all the secondary side airflow to the outside, thereby ensuring the cooling effect of the indirect evaporative cooling air conditioning unit. If the temperature of the secondary side air inlet is too low, which causes the air heat exchanger to have the possibility of dewing, the control assembly controls a part of the air guide modules to deliver a part of the secondary side airflow to the outside, and controls another part of the air guide modules to receive another part of the secondary side airflow delivered by the adjacent air guide modules, so that the part of the secondary side airflow passes through the air heat exchanger and is transmitted back to the secondary side air inlet. Since the secondary side airflow backflowing from the secondary side air outlet has passed through the heat exchange of the air heat exchanger, the temperature is relatively high, and the part of the backflowing high-temperature secondary side airflow can be mixed with the fresh air at the secondary side air inlet, thereby increasing the temperature of the airflow entering the secondary side air inlet and further increasing the temperature of the air heat exchanger, thereby avoiding the dewing problem of the air heat exchanger.

[0012] In a second aspect, the embodiments of the present disclosure provide a control method of an indirect evaporative cooling air conditioning unit, which is suitable for the indirect evaporative cooling air conditioning unit of the first aspect, and the control method comprises the following steps:

[0013] The temperature sensor of the control assembly determines the inlet air temperature, which is the temperature of the airflow at the secondary side air inlet;

[0014] If the inlet air temperature is not less than a set temperature, the controller of the control assembly controls the air guide modules to deliver the airflow at the secondary side air outlet to the outside, and if the inlet air temperature is less than the set temperature, the controller controls part of the air guide modules to receive the airflow delivered by the adjacent air guide modules and make the airflow backflow to the secondary side air inlet.

[0015] The technical scheme provided by the embodiments of the present disclosure has at least the following beneficial effects:

[0016] In the control method provided by the embodiments of the present disclosure, the temperature of the air inlet at the secondary side is determined, and the flow direction of the air flow at the secondary side is controlled by the air guide module according to the temperature of the air inlet. If the temperature of the air inlet is not less than the set temperature, all air guide modules are controlled to transmit all air flows at the secondary side to the outside. If the temperature of the air inlet is less than the set temperature, part of the air guide modules are controlled to transmit part of the air flows at the secondary side to the outside, and the other part of the air guide modules are controlled to receive the other part of the air flows at the secondary side transmitted by the adjacent air guide modules, so that the part of the air flows at the secondary side pass through the air heat exchanger and are transmitted back to the air inlet at the secondary side. Since the air flow at the secondary side flowing back from the air outlet at the secondary side has passed the heat exchange of the air heat exchanger, the temperature of the air flow is relatively high, and the part of the high-temperature air flow flowing back can be mixed with the fresh air at the air inlet at the secondary side, so as to increase the temperature of the air flow entering the air inlet at the secondary side, and further increase the temperature of the air heat exchanger, thereby avoiding the problem of dew condensation of the air heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic diagram of an indirect evaporative cooling air conditioning unit provided by the embodiments of the present disclosure;

[0019] Figure 2 is another structural schematic diagram of an indirect evaporative cooling air conditioning unit provided by the embodiments of the present disclosure;

[0020] Figure 3 is still another structural schematic diagram of an indirect evaporative cooling air conditioning unit provided by the embodiments of the present disclosure;

[0021] Figure 4 is a structural schematic diagram of a second air guide assembly provided by the embodiments of the present disclosure;

[0022] Figure 5 is a structural schematic diagram of a first air guide assembly provided by the embodiments of the present disclosure;

[0023] Figure 6 is a flow chart of a control method of an indirect evaporative cooling air conditioning unit provided by the embodiments of the present disclosure.

[0024] The meanings of the symbols in the drawings are as follows:

[0025] 1, first air guide assembly; 11, air inlet shell; 111, third air outlet; 112, fourth air outlet;

[0026] 2、second air guide assembly;

[0027] 21、air guide module; 211、fan; 212、air valve; 2121、flap unit; 22、air outlet shell; 221、first air outlet; 222、second air outlet;

[0028] 3、air heat exchanger;

[0029] 31、secondary side air inlet; 32、secondary side air outlet;

[0030] 4、control assembly;

[0031] 41、temperature sensor; 42、controller;

[0032] 5、intermediate channel;

[0033] 6、partition. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the drawings.

[0035] The water evaporation cooling air conditioning unit is an air conditioning system applied to a data center, which is used to adjust the temperature inside the data center so that the electronic equipment in the data center can work stably at a suitable temperature.

[0036] In the related art, the indirect evaporative cooling air conditioning unit mainly includes a primary side fan, a secondary side fan, an air heat exchanger and a spraying system. The primary side fan is used to realize circulation of airflow inside the data center (primary side airflow), and the secondary side fan is used to realize circulation of airflow outside the data center (secondary side airflow). The air heat exchanger is located at the intersection of the air ducts of the primary side fan and the secondary side fan. Under the action of the spraying system and the secondary side fan, the primary side airflow can be sufficiently cooled in the process of flowing through the low-temperature air heat exchanger, so as to achieve the effect of adjusting the temperature inside the data center.

[0037] However, if the surface temperature of the air heat exchanger is too low, dew (water vapor condenses on an object with a lower temperature when the water vapor reaches the saturation temperature in the air) will be generated on the indoor side of the air heat exchanger. Once the dew is generated, the humidity of the primary side airflow will be reduced, which increases the humidification load of the indirect evaporative cooling air conditioning unit and increases the energy consumption. Moreover, the condensed water condensed on the surface of the air heat exchanger may freeze, which causes the air heat exchanger to crack.

[0038] In order to solve the above technical problems, the embodiments of the present disclosure provide an indirect evaporative cooling air conditioning unit, Figure 1The structural schematic diagram of the indirect evaporative cooling air conditioning unit is shown in combination with Figure 1 In the embodiment, the indirect evaporative cooling air conditioning unit comprises a first air guide assembly 1, a second air guide assembly 2, an air heat exchanger 3, and a control assembly 4.

[0039] The first air guide assembly 1 is located at one side of the air heat exchanger 3 and communicates with a secondary side air inlet 31 of the air heat exchanger 3. The second air guide assembly 2 is located at the opposite side of the air heat exchanger 3. The second air guide assembly 2 comprises at least two air guide modules 21 that are in communication with each other. The at least two air guide modules 21 are arranged in sequence along the length direction of a secondary side air outlet 32 of the air heat exchanger 3 and respectively communicate with the secondary side air outlet 32. The control assembly 4 is located outside the air heat exchanger 3 and is electrically connected with each air guide module 21. The control assembly 4 is configured to control a part of the air guide modules 21 to transport the air flow at the secondary side air outlet 32 to the outside, and control another part of the air guide modules 21 to receive the air flow transported by the adjacent air guide modules 21 and make the air flow backflow to the secondary side air inlet 31.

[0040] When the indirect evaporative cooling air conditioning unit is working, under the action of the air guide modules 21, the air from the outside enters the air heat exchanger 3 through the secondary side air inlet 31 and is output from the secondary side air outlet 32 to form a secondary side air flow. When the temperature of the secondary side air inlet 31 is normal and the air heat exchanger 3 does not have the possibility of dewing, the control assembly 4 controls all the air guide modules 21 to transport all the secondary side air flow to the outside, thereby ensuring the cooling effect of the indirect evaporative cooling air conditioning unit. When the temperature of the secondary side air inlet 31 is too low, which leads to the possibility of dewing of the air heat exchanger 3, the control assembly 4 controls a part of the air guide modules 21 to transport a part of the secondary side air flow to the outside. The control assembly 4 controls another part of the air guide modules 21 to receive another part of the secondary side air flow transported by the adjacent air guide modules 21, so that the part of the secondary side air flow passes through the air heat exchanger 3 and is transported back to the secondary side air inlet 31. Since the backflow secondary side air flow from the secondary side air outlet 32 has passed through the heat exchange of the air heat exchanger 3, the temperature of the backflow secondary side air flow is higher. The backflow high-temperature secondary side air flow can mix with the fresh air at the secondary side air inlet 31, thereby increasing the temperature of the air flow entering the secondary side air inlet 31 and further increasing the temperature of the air heat exchanger 3, which avoids the dewing problem of the air heat exchanger 3.

[0041] As shown in FIG. 1, Figure 1 It can be seen that the second air guide assembly 2 comprises two air guide modules 21. Of course, the second air guide assembly 2 can also have other numbers of air guide modules 21, such as 3, 4, 5, 6, etc. Figure 3That is, when the second air guide assembly 2 has six air guide modules 21, the structure of the indirect evaporative cooling air conditioning unit is shown in the schematic diagram. It is easy to understand that each air guide module is controlled by the control assembly 4, and the more air guide modules 21, the more precise the control of the secondary side airflow, and the more complex the structure of the second air guide assembly 2 and the control logic of the control assembly 4. The number of air guide modules 21 is not limited by the embodiment of the present disclosure.

[0042] As can be known from the foregoing, the second air guide assembly 2 changes the flow direction of the secondary side airflow to make the high-temperature secondary side airflow flow back to the secondary side air inlet 31, thereby warming the air at the secondary side air inlet 31. The second air guide assembly 2 will be introduced below by taking the case where the second air guide assembly 2 includes two air guide modules 21 as an example.

[0043] Figure 4 The structure of the second air guide assembly 2 is shown in the schematic diagram, in order to show the assembly relationship between the second air guide assembly 2 and the air heat exchanger 3, Figure 4 The air heat exchanger 3 is shown in the middle.

[0044] In combination with Figure 4 In the embodiment, the second air guide assembly 2 includes an air outlet shell 22. The air outlet shell 22 extends along the length direction of the secondary side air outlet 32 and is connected to the outer wall of the air heat exchanger 3. The air outlet shell 22 has a first air port 221 and a second air port 222 that are in communication with each other, and the first air port 221 is in communication with the secondary side air outlet 32.

[0045] In the above implementation manner, the air outlet shell 22 is connected to the air heat exchanger 3 to provide a containing space and a mounting base for the air guide module 21. Since the air outlet shell 22 has the first air port 221 and the second air port 222, the first air port 221 is in communication with the secondary side air outlet 32, and the second air port 222 is in communication with the outside, so the secondary side airflow can be transmitted to the outside through the air outlet shell 22.

[0046] Exemplarily, the air outlet shell 22 has a strip-shaped structure, the first air port 221 is located on one side in the width direction, and the second air port 222 is located on the other side in the width direction, so as to facilitate the flow of the secondary side airflow between the first air port 221 and the second air port 222.

[0047] In the embodiment, each air guide module 21 is located between the first air port 221 and the second air port 222 and connected with the air outlet shell 22. The air guide module 21 comprises an air fan 211 and an air valve 212. The air fan 211 is located between the first air port 221 and the second air port 222 and close to the secondary side air outlet 32. The air inlet of the air fan 211 is communicated with the secondary side air outlet 32. The air fan 211 is connected with the air outlet shell 22. The air valve 212 is located on the side of the air fan 211 away from the secondary side air outlet 32. The air valve 212 is located at the second air port 222 and connected with the air outlet shell 22.

[0048] In the above implementation, the air fan 211 is used to suck the air from the secondary side air inlet 31 into the first air guide assembly 1 and flow out from the secondary side air outlet 32 via the air heat exchanger 3, so as to form the secondary side air flow. The air valve 212 can close or expose the secondary side air outlet 32 at the position thereof by adjusting the opening degree thereof.

[0049] It is easy to understand that the greater the opening degree of the air valve 212 is, the more the secondary side air outlet 32 at the position of the air valve 212 is exposed, the more the secondary side air flow is transmitted to the outside, and the less the secondary side air flow is transmitted to the adjacent air guide module 21. Conversely, the smaller the opening degree of the air valve 212 is, the less the secondary side air outlet 32 at the position of the air valve 212 is exposed, the less the secondary side air flow is transmitted to the outside, and the more the secondary side air flow is transmitted to the adjacent air guide module 21. When the air valve 212 is completely closed, the corresponding air fan 211 also stops working, so that the secondary side air flow can flow back to the secondary side air inlet 31 from the corresponding secondary side air outlet 32, so as to be mixed with fresh air, thereby improving the temperature at the position.

[0050] The air valve 212 will be further described below.

[0051] In the embodiment, the air valve 212 comprises a plurality of flap units 2121. The plurality of flap units 2121 are arranged in sequence along the length direction of the secondary side air outlet 32 and rotatably connected with the air outlet shell 22. When the outer sides of two adjacent flap units 2121 are in contact, the air valve 212 closes the second air port 222, i.e. the air outlet of the air fan 211. When the outer sides of two adjacent flap units 2121 are spaced, the air valve 212 exposes the second air port 222, i.e. the air outlet of the air fan 211.

[0052] In the above implementation, the flap unit 2121 is a plate-shaped structure, the rotation axis between the flap unit 2121 and the air outlet casing 22 is perpendicular to the length direction of the secondary air outlet 32 and parallel to the flap unit 2121 itself. The turning angles of the flap units 2121 in the same air guide module 21 are the same and are turned synchronously. By adjusting the turning angles of the flap units 2121, the gap sizes between the flap units 2121 can be adjusted, so as to adjust the opening degrees of the air valves 212. When the flap units 2121 are perpendicular to each other, the gap between the adjacent two flap units 2121 is the largest, and at this time, the opening degree of the air valve 212 is the largest, and the secondary air flow will not be affected when flowing to the outside. When the flap units 2121 are in the same plane, there is no gap between the adjacent two flap units 2121, and at this time, the air valve 212 is closed.

[0053] Optionally, in order to ensure the synchronization of the turning of the flap units 2121, the flap units 2121 are driven by a gear and rack mechanism, the gears are arranged on the flap units 2121 and coaxial with the rotation axes of the flap units 2121. Through the linear movement of the rack mechanism, the gears are driven to rotate synchronously, so as to drive the flap units 2121 to turn synchronously. Of course, in other embodiments, the flap units 2121 can also be driven individually. For example, motors are arranged on the flap units 2121 respectively, and the flap units 2121 are driven to turn by the motors, so that the turning angles of the flap units 2121 can be controlled individually.

[0054] Continuing to refer to Figure 4 Optionally, in order to improve the uniformity of air flow, the fan 211 is multiple, and the multiple fans 211 are arranged at intervals along the length direction of the secondary air outlet 32.

[0055] Optionally, if the size of the air guide module 21 is large, one air guide module 21 can include multiple fans 211, and the multiple fans 211 are arranged at intervals along the length direction of the secondary air outlet 32. If the size of the air guide module 21 is small, one air guide module 21 can include only one fan 211, and the fans 211 of the air guide modules 21 are arranged at intervals along the length direction of the secondary air outlet 32.

[0056] Generally, the secondary air outlet 32 of the air heat exchanger 3 is arranged with the remaining components of the indirect evaporative cooling air conditioning unit. In order to provide arrangement space for these components, in the embodiment, the indirect evaporative cooling air conditioning unit further includes at least two intermediate channels 5, the intermediate channels 5 are located between the second air guide assembly 2 and the air heat exchanger 3 and are arranged in sequence along the length direction of the secondary air outlet 32, the intermediate channels 5 correspond to the air guide modules 21 one by one, and the intermediate channels 5 are in communication with the corresponding second air guide assembly 2 and air heat exchanger 3 respectively.

[0057] In the above implementation, the intermediate channel 5 is used to provide installation space for other components of the indirect evaporative cooling air conditioning unit, and the intermediate channel 5 corresponds to the air guide module 21 one by one. After the secondary side airflow is output by the secondary side air outlet 32, the secondary side airflow enters the corresponding air guide module 21 through the intermediate channel 5.

[0058] Optionally, the indirect evaporative cooling air conditioning unit further comprises a partition plate 6, the partition plate 6 is located between adjacent two intermediate channels 5, and the partition plate 6 is detachably connected with the air heat exchanger 3.

[0059] Through the partition plate 6, the intermediate channels 5 can be effectively separated, so that the secondary side airflow is prevented from flowing between the intermediate channels 5, and the flow direction of the secondary side airflow is more accurate.

[0060] Exemplarily, the partition plate 6 is clamped between the adjacent two intermediate channels 5 and connected with the air heat exchanger 3 through screws.

[0061] In other embodiments, the intermediate channels 5 are connected as a whole, and the partition plate 6 is arranged in the intermediate channel 5 along the length direction of the secondary side air outlet 32 according to requirements, so as to separate a plurality of independent channels corresponding to the air guide modules 21. Through such design, the indirect evaporative cooling air conditioning unit with a whole intermediate channel 5 can be modified to have a plurality of independent intermediate channels 5. In this way, the existing structure can be utilized, and the applicability of the indirect evaporative cooling air conditioning unit provided in the embodiments of the present disclosure is improved.

[0062] Figure 5 FIG. 1 is a structural schematic view of the first air guide assembly 1, and FIG. 2 is a structural schematic view of the air heat exchanger 3. Figure 5 In FIG. 2, the air heat exchanger 3 is shown.

[0063] In combination with Figure 5 In the present embodiment, the first air guide assembly 1 comprises an air inlet shell 11, the air inlet shell 11 extends along the length direction of the secondary side air inlet 31 and is connected with the outer wall of the air heat exchanger 3, the air inlet shell 11 has a third air port 111 and a fourth air port 112 which are in communication with each other, and the third air port 111 is in communication with the secondary side air inlet 31.

[0064] In the above implementation, the air inlet shell 11 is connected with the air heat exchanger 3 to provide an air inlet channel for the air heat exchanger 3. Since the air inlet shell 11 has the third air port 111 and the fourth air port 112, the third air port 111 is in communication with the secondary side air inlet 31, and the fourth air port 112 is in communication with the outside, so that the air outside can enter the air heat exchanger 3 through the air inlet shell 11.

[0065] Optionally, the fourth air outlet 112 is in plurality, and the plurality of fourth air outlets 112 are arranged around the third air outlet 111.

[0066] Since the fourth air outlet 112 is in communication with the outside, the fourth air outlet 112 is designed in plurality, which can effectively improve the air inlet efficiency of the air inlet shell 11. Moreover, since each fourth air outlet is arranged around the third air outlet 111, the air entering the air inlet shell 11 can quickly enter the air heat exchanger 3 through the third air outlet 111, further improving the air inlet efficiency of the air inlet shell 11.

[0067] Exemplarily, the air inlet shell 11 is in a strip shape, the third air outlet 111 is located at one side in the width direction, and the fourth air outlet 112 is located at both ends in the length direction.

[0068] Again referring to Figure 1 In the embodiment, the control assembly 4 includes a temperature sensor 41 and a controller 42.

[0069] The temperature sensor 41 is located in the first air guide assembly 1 and adjacent to the secondary air inlet 31, and the temperature sensor 41 is connected to the first air guide assembly 1. The controller 42 is located outside the air heat exchanger 3 and electrically connected to the temperature sensor 41 and each air guide module 21, respectively.

[0070] In the above implementation, the temperature sensor 41 is used to sense the temperature of the air flow at the secondary air inlet 31, the controller 42 is used to receive the temperature parameter signal sent by the temperature sensor 41, and to control the fan 211 and the air valve 212 to act according to the temperature parameter signal, thereby realizing the effect of automatic control, so that the air flow at the secondary air inlet 31 is always at a suitable temperature.

[0071] For example, if the temperature sensor 41 senses that the temperature at the secondary side air inlet 31 is high, all the fans 211 are normally operated, and all the air valves 212 are fully opened, so that all the high-temperature secondary side air flows to the outside, and the heat dissipation performance of the indirect evaporative cooling air conditioning unit is optimal. If the temperature sensor 41 senses that the temperature at the secondary side air inlet 31 decreases to the set temperature, part of the fans 211 are closed, and the air valves 212 corresponding to the part of the fans 211 are closed, so that part of the high-temperature secondary side air flows to the outside from the air guide module 21 that is kept open, and the other part of the high-temperature secondary side air enters the adjacent air guide module 21 and flows back to the secondary side air inlet 31 through the air heat exchanger 3 to be warmed. In this state, if the temperature of the secondary side air continues to decrease, the opening degree of the air valve 212 is reduced, so that a small part of the high-temperature secondary side air flows to the outside, and most of the high-temperature secondary side air flows back to the secondary side air inlet 31 to be warmed, thereby improving the warming effect. In the state that part of the air valves 212 are closed, if the temperature at the secondary side air inlet 31 rises, the opening degree of the air valve 212 is increased, so that most of the high-temperature secondary side air flows to the outside, and a small part of the high-temperature secondary side air flows back to the secondary side air inlet 31 to be warmed, thereby reducing the warming effect.

[0072] That is, if the warming effect needs to be improved, the fans 211 are closed and the air valves 212 are closed, or the opening degree of the air valves 212 is reduced. If the warming effect needs to be reduced, the fans 211 are started and the air valves 212 are opened, or the opening degree of the air valves 212 is increased. The above actions can be performed according to the needs, and the embodiments of the present disclosure do not limit this.

[0073] Figure 6 A flowchart of a control method of an indirect evaporative cooling air conditioning unit is provided for the embodiments of the present disclosure, and the control method is applicable to the indirect evaporative cooling air conditioning unit shown in FIG. 1. Figures 1-5 As shown in FIG. 1, the control method comprises the following steps. Figure 6 The control method comprises the following steps.

[0074] In step 601, the temperature sensor 41 of the control assembly 4 determines the inlet air temperature, which is the temperature of the air flow at the secondary side air inlet 31.

[0075] In step 601, the inlet air temperature can be obtained, thereby providing a data basis for adjusting the air inlet module in the subsequent steps.

[0076] In step 602, it is determined whether the inlet air temperature is less than the set temperature. If the inlet air temperature is not less than the set temperature, step 603 is performed, and if the inlet air temperature is less than the set temperature, step 604 is performed.

[0077] Exemplarily, the set temperature is a human set value, which can be set according to the needs.

[0078] For example, assuming that the indirect evaporative cooling air conditioning unit has an inlet air temperature of 22℃ for the primary side of the data center (which can be equivalent to the indoor side temperature of the air heat exchanger 3, which is the lowest temperature of the air heat exchanger 3 here), and a humidity of 40%, then the corresponding dew point temperature is 7.8℃. Assuming that the rated heat exchange temperature difference of the air heat exchanger 3 is 6℃, then the inlet air temperature is controlled to be above 2℃, so as to ensure that the indoor side temperature of the air heat exchanger 3 is above 8℃, which is greater than the dew point temperature 7.8℃, and no condensation temperature is generated.

[0079] Step 603: The air flow at the secondary side air outlet 32 is transported to the outside by the air guide module 21 controlled by the controller 42 of the control assembly 4.

[0080] Through step 603, all high-temperature secondary side air flow can be transmitted from the second air guide assembly 2 to the outside, which can ensure the cooling effect of the indirect evaporative cooling air conditioning unit and will not be affected by the setting of the second air guide assembly 2 and other components.

[0081] Step 604: The air flow transported by the adjacent air guide module 21 is received by the air guide module 21 controlled by the controller 42, and the air flow is returned to the secondary side air inlet 31.

[0082] It should be noted that the air guide module 21 refers to at least one complete air guide module 21 in all air guide modules 21. For example, if there are 6 air guide modules 21, then the air guide module 21 refers to 1, 2, 3, 4, 5 air guide modules 21 in the 6 air guide modules 21.

[0083] Through step 604, only a part of the secondary side air flow is transmitted to the outside through the air guide module 21, and the other part of the secondary side air flow is sequentially transmitted to the secondary side air inlet 31 through the adjacent air guide module 21 and the air heat exchanger 3, so as to warm the air at the secondary side air inlet 31.

[0084] That is, when the indirect evaporative cooling air conditioning unit is controlled by the control method provided by the embodiments of the present disclosure, the temperature of the air inlet at the secondary side air inlet 31 is determined, and according to the temperature of the air inlet, the flow direction of the secondary side air flow is controlled by the air guide module 21. If the temperature of the air inlet is not less than the set temperature, all air guide modules 21 are controlled to transmit all the secondary side air flow to the outside. If the temperature of the air inlet is less than the set temperature, a part of the air guide modules 21 are controlled to transmit a part of the secondary side air flow to the outside, and the other part of the air guide modules 21 are controlled to receive another part of the secondary side air flow transmitted by the adjacent air guide modules 21, so that this part of the secondary side air flow passes through the air heat exchanger 3 and is transmitted back to the secondary side air inlet 31. Because the secondary side air flow flowing back from the secondary side air outlet 32 has already passed through the heat exchange of the air heat exchanger 3, the temperature is higher, and this part of the high-temperature secondary side air flow flowing back can be mixed with the fresh air at the secondary side air inlet 31, thereby increasing the temperature of the air flow entering the secondary side air inlet 31, and further increasing the temperature of the air heat exchanger 3, thereby avoiding the problem of dew condensation of the air heat exchanger 3.

[0085] The above only describes optional embodiments of the present disclosure and does not limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An indirect evaporative cooling air handling unit characterized by, The air heat exchanger (3) comprises a first air guide assembly (1), a second air guide assembly (2), an air heat exchanger (3) and a control assembly (4); The first air guide assembly (1) is located on one side of the air heat exchanger (3) and communicates with the secondary side air inlet (31) of the air heat exchanger (3); The second air guide assembly (2) is located on the other side of the air heat exchanger (3), the second air guide assembly (2) comprises at least two air guide modules (21) that communicate with each other, and the at least two air guide modules (21) are arranged along the length direction of the secondary side air outlet (32) of the air heat exchanger (3) in sequence and respectively communicate with the secondary side air outlet (32); The control assembly (4) is located outside the air heat exchanger (3) and is electrically connected with each air guide module (21), and the control assembly (4) is configured to control the air guide module (21) to deliver the air flow at the secondary side air outlet (32) to the outside, or control the air guide module (21) to receive the air flow delivered by the adjacent air guide module (21) and make the air flow backflow to the secondary side air inlet (31).

2. The indirect evaporative cooling air conditioning unit of claim 1, wherein, The air guide module (21) comprises a fan (211) and an air valve (212); The fan (211) is close to the secondary side air outlet (32), and the air inlet of the fan (211) communicates with the secondary side air outlet (32); The air valve (212) is located on the side of the fan (211) away from the secondary side air outlet (32) and communicates with the air outlet of the fan (211).

3. The indirect evaporative cooling air conditioning unit of claim 2, wherein, The air valve (212) comprises a plurality of flap units (2121); The plurality of flap units (2121) are arranged along the length direction of the secondary side air outlet (32) in sequence; When the outer sides of two adjacent flap units (2121) are in contact, the air valve (212) closes the air outlet of the fan (211); when the outer sides of two adjacent flap units (2121) are spaced, the air valve (212) exposes the air outlet of the fan (211).

4. The indirect evaporative cooling air conditioning unit of claim 2, wherein, The fan (211) is a plurality of; The plurality of fans (211) are arranged in the length direction of the secondary side air outlet (32) in sequence.

5. The indirect evaporative cooling air conditioning unit of claim 1, wherein, The second air guide assembly (2) further comprises an air outlet shell (22); The air outlet shell (22) extends along the length direction of the secondary side air outlet (32) and is connected with the outer wall of the air heat exchanger (3), the air outlet shell (22) has a first air port (221) and a second air port (222) that communicate with each other, and the first air port (221) communicates with the secondary side air outlet (32); Each air guide module (21) is located between the first air port (221) and the second air port (222) and is connected with the air outlet shell (22).

6. The indirect evaporative cooling air conditioning unit according to any of claims 1-5, wherein, Further comprising at least two intermediate channels (5); The intermediate channels (5) are located between the second air guide assemblies (2) and the air heat exchangers (3), and are arranged along the length direction of the secondary side air outlet (32) in sequence, the intermediate channels (5) correspond to the air guide modules (21) one by one, and the intermediate channels (5) are in communication with the corresponding second air guide assemblies (2) and air heat exchangers (3) respectively.

7. The indirect evaporative cooling air conditioning unit of claim 6, wherein, The partition plates (6) are further included; The partition plates (6) are located between adjacent two intermediate channels (5), and the partition plates (6) are detachably connected with the air heat exchangers (3).

8. The indirect evaporative cooling air conditioning unit according to any of claims 1-5, wherein, The first air guide assemblies (1) include air inlet housings (11); The air inlet housings (11) extend along the length direction of the secondary side air inlets (31) and are connected with the outer walls of the air heat exchangers (3), and the air inlet housings (11) have third air inlets (111) and fourth air inlets (112) in communication with each other, and the third air inlets (111) are in communication with the secondary side air inlets (31).

9. The indirect evaporative cooling air conditioning unit according to any of claims 1-5, wherein, The control assemblies (4) include temperature sensors (41) and controllers (42); The temperature sensors (41) are located in the first air guide assemblies (1) and adjacent to the secondary side air inlets (31), and the temperature sensors (41) are connected with the first air guide assemblies (1); The controllers (42) are located outside the air heat exchangers (3) and are electrically connected with the temperature sensors (41) and the air guide modules (21) respectively.

10. A method of controlling an indirect evaporative air-cooled chiller unit, the method comprising: The control method is suitable for the indirect evaporative cooling air conditioning unit of any one of claims 1-9, and the control method comprises: Determining the air inlet temperature by the temperature sensor (41) of the control assembly (4), wherein the air inlet temperature is the temperature of the airflow at the secondary side air inlet (31); If the air inlet temperature is not less than the set temperature, controlling the air guide modules (21) to deliver the airflow at the secondary side air outlet (32) to the outside by the controller (42) of the control assembly (4), and if the air inlet temperature is less than the set temperature, controlling part of the air guide modules (21) to receive the airflow delivered by the adjacent air guide modules (21) and make the airflow backflow to the secondary side air inlet (31) by the controller (42).

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