Indirect evaporative cooling unit, data center and antifreeze control method

Abstract

The present application provides an indirect evaporative cooling unit, a data center and an antifreeze control method, wherein the indirect evaporative cooling unit comprises a heat exchange core having an outdoor air duct, a first exhaust chamber and a second exhaust chamber both connected to the air outlet of the outdoor air duct, a first partition, a first exhaust fan, a second exhaust fan and a controller, wherein the first partition separates the first exhaust chamber and the second exhaust chamber; the first exhaust fan and the second exhaust fan are respectively located on the side of the first exhaust chamber and the second exhaust chamber away from the air outlet of the outdoor air duct; the controller is used to control the first exhaust fan to a first state according to the temperature, and to control the second exhaust fan to a second state, wherein the first state is one of the exhaust state and the non-exhaust state, and the second state is the other of the exhaust state and the non-exhaust state. The first partition is provided, and the first exhaust fan or the second exhaust fan is controlled to be in a non-exhaust state according to the temperature, so as to defrost the indirect evaporative cooling unit, and the risk of the heat exchange core being broken due to ice formation can also be avoided.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to an indirect evaporative cooling unit, a data center and an antifreeze control method. Background Art

[0002] Indirect evaporative cooling units are widely used in major data centers due to their low energy consumption and large cooling capacity. Data centers are global collaborative specific equipment networks used to transmit, accelerate, display, calculate and store data information on network infrastructure. Since indirect evaporative cooling units need to use outdoor fresh air for heat exchange, when the outdoor ambient temperature is low, the low-temperature fresh air will directly cause the heat exchange core in the indirect evaporative cooling unit to freeze at low temperatures. In severe cases, ice blockage will occur, the heat exchange capacity of the unit will be reduced, and in severe cases, the core will even rupture. Some manufacturers use air valves to divert outdoor low-temperature fresh air for anti-freezing, but the cost is high and the reliability is not high. Summary of the invention

[0003] The present application provides an indirect evaporative cooling unit, a data center and an antifreeze control method, wherein a first partition is arranged in the indirect evaporative cooling unit to separate a first exhaust chamber from a second exhaust chamber, and the first exhaust fan or the second exhaust fan is controlled to be in a non-exhaust state according to the temperature, so as to defrost the indirect evaporative cooling unit, and the risk of rupture of a heat exchange core due to ice formation can be avoided.

[0004] In the first aspect, the present application provides an indirect evaporative cooling unit, including a heat exchange core, a first exhaust chamber, a second exhaust chamber, a first partition, a first exhaust fan, a second exhaust fan and a controller, wherein the heat exchange core includes an outdoor air duct; the first exhaust chamber and the second exhaust chamber are both connected to the air outlet of the outdoor air duct; the first partition separates the first exhaust chamber and the second exhaust chamber; the first exhaust fan and the second exhaust fan are respectively located on the side of the first exhaust chamber and the second exhaust chamber away from the air outlet of the outdoor air duct; the controller is used to control the first exhaust fan to a first state and the second exhaust fan to a second state according to the temperature, the first state being one of the exhaust state and the non-exhaust state, and the second state being the other of the exhaust state and the non-exhaust state.

[0005] The indirect evaporative cooling unit provided in the present application separates the first exhaust chamber and the second exhaust chamber by a first partition, and controls the first exhaust fan to be in a first state and the second exhaust fan to be in a second state according to the temperature through a controller, so that the indirect evaporative cooling unit can be defrosted when the temperature is low, thereby increasing the air flow rate in the heat exchange core and improving the heat exchange effect of the indirect evaporative cooling unit; in addition, the risk of the heat exchange core breaking due to ice formation can be avoided.

[0006] In a possible implementation, the heat exchange core further includes an indoor air duct, and the outdoor air duct and the indoor air duct are mutually unconnected channels in the heat exchange core. The indoor air duct refers to a channel for indoor hot air to circulate, and the channel walls of the outdoor air duct and the indoor air duct are adjacent, and heat exchange is performed through the channel walls. When outdoor cold air flows through the outdoor air duct, the channel wall of the outdoor air duct is cooled down, and when indoor hot air flows through the indoor air duct, the channel wall of the indoor air duct is heated up. Heat exchange occurs between the channel walls of the outdoor air duct and the indoor air duct, and then heat exchange is performed on the airflow in the outdoor air duct and the indoor air duct, thereby realizing cooling down the indoor hot air in the indoor air duct into indoor cold air, and heating up the outdoor cold air in the outdoor air duct into outdoor hot air.

[0007] In a possible implementation, in the heat exchange core, the outdoor air duct includes a first outdoor sub-duct connected to the first exhaust cavity and a second outdoor sub-duct connected to the second exhaust cavity, the air outlet of the first outdoor sub-duct is connected to the first exhaust cavity, and the air outlet of the second outdoor sub-duct is connected to the second exhaust cavity.

[0008] In a possible implementation, the outdoor air duct and the indoor air duct are arranged crosswise, wherein the outdoor air duct includes a plurality of outdoor sub-air ducts, the first outdoor sub-air duct includes a portion of the plurality of outdoor sub-air ducts, and the second outdoor sub-air duct includes a portion of the plurality of outdoor sub-air ducts. The indoor air duct includes a plurality of indoor sub-air ducts, each of which is arranged adjacent to an outdoor sub-air duct, so that indoor hot air in the indoor sub-air duct exchanges heat with outdoor cold air in the outdoor sub-air duct to reduce temperature.

[0009] Among them, the exhaust state refers to the normal operation of the first exhaust fan and the second exhaust fan, so that the first exhaust fan and the second exhaust fan drive the outdoor cold air into the outdoor air duct, and discharge the outdoor hot air after heat exchange into the outdoor air duct.

[0010] In a possible implementation, the non-exhaust state includes not starting the first exhaust fan or the second exhaust fan, or reversing the first exhaust fan or the second exhaust fan. The first exhaust fan or the second exhaust fan is reversed so that the outdoor hot air after the outdoor cold air is heat exchanged by the heat exchange core is sent back to the outdoor air duct to heat and defrost the outdoor air duct, that is, the non-exhaust state includes not exhausting air to the outside and sending air to the outdoor air duct.

[0011] In one possible implementation, when the rotation direction of the first exhaust fan and the second exhaust fan during normal operation is clockwise, the rotation direction of the first exhaust fan and the second exhaust fan during reverse operation is counterclockwise; or when the rotation direction of the first exhaust fan and the second exhaust fan during normal operation is counterclockwise, the rotation direction of the first exhaust fan and the second exhaust fan during reverse operation is clockwise.

[0012] In a possible implementation, the indirect evaporative cooling unit further includes a blower, which is used to drive the indoor hot air into the indoor air duct. The first exhaust fan, the second exhaust fan and the blower can all be fans, and the first exhaust fan and the second exhaust fan are used to discharge the outdoor hot air heated by the heat exchange core out of the indirect evaporative cooling unit, and the blower is used to discharge the indoor cold air cooled by the heat exchange core out of the indirect evaporative cooling unit and send it back to the room.

[0013] In a possible implementation, the temperature is an outdoor temperature or a temperature of a core wall of the heat exchange core. The controller controls the first exhaust fan to a first state and the second exhaust fan to a second state according to the outdoor temperature or the temperature of the heat exchange core wall. The controller is electrically connected to the first exhaust fan and the second exhaust fan.

[0014] In a possible implementation, the indirect evaporative cooling unit further includes a temperature sensor, which is used to detect the outdoor temperature or the temperature of the heat exchange core wall. The controller is connected to the temperature sensor and is used to obtain the temperature detected by the temperature sensor. The temperature sensor can be set at the air inlet of the outdoor air duct, or can be set on the heat exchange core wall.

[0015] In some embodiments, the temperature received by the controller may also be obtained through manual detection and input into the controller.

[0016] In some embodiments, the temperature can be obtained through a terminal, for example, a controller is connected to the terminal, the terminal can obtain the ambient temperature, and transmit the ambient temperature to the controller, and the controller controls the first exhaust fan to a first state and the second exhaust fan to a second state according to the ambient temperature.

[0017] In a possible implementation, the indirect evaporative cooling unit also includes a shell, the heat exchange core is located in the shell, the shell includes a first side panel and a top panel, the first side panel and the top panel intersect and are connected, the heat exchange core includes a first air outlet surface connected to the outdoor air duct, the first air outlet surface intersects and is connected to the first side panel and the top panel, the first air outlet surface, the first side panel and the top panel enclose an exhaust space, the first partition is located in the exhaust space and divides the exhaust space into the first exhaust cavity and the second exhaust cavity.

[0018] In a possible implementation, the top plate portion constituting the first exhaust cavity is recorded as a first top plate sub-portion, and the first side plate portion constituting the first exhaust cavity is recorded as a first side plate sub-portion; the top plate portion constituting the second exhaust cavity is recorded as a second top plate sub-portion, and the first side plate portion constituting the second exhaust cavity is recorded as a second side plate sub-portion; the first air outlet surface includes a first area and a second area, the first area and the second area are separated by the first partition plate, the first area is connected to the first exhaust cavity, the first top plate sub-portion, the first side plate sub-portion and the first area are enclosed to form the first exhaust cavity, the second area is connected to the second exhaust cavity, and the second top plate sub-portion, the second side plate sub-portion and the second area are enclosed to form the second exhaust cavity.

[0019] In a possible implementation, the first exhaust fan and the second exhaust fan are respectively located on the side of the first top plate sub-part and the second top plate sub-part away from the heat exchange core. The outdoor cold air in the outdoor air duct will be heated up to become outdoor hot air, and the airflow with higher temperature will flow upward. The first exhaust fan and the second exhaust fan are arranged above the top plate, which is conducive to exhausting the outdoor hot air.

[0020] In a possible implementation, the shell further includes a second side plate, a first support rod, a second support rod and a bottom plate, the first side plate and the second side plate are arranged relative to each other along the second direction, the top plate and the bottom plate are arranged relative to each other along the first direction, the first support rod and the second support rod are located between the top plate and the bottom plate, one end of the heat exchange core along the third direction is fixed between the top plate and the first support rod, and the other end of the heat exchange core along the third direction is fixed between the top plate and the second support rod, wherein the first direction intersects perpendicularly with the second direction, and the third direction intersects perpendicularly with the first direction and the second direction respectively. The heat exchange core is arranged between the first support rod, the second support rod and the top plate, so that space is reserved between the heat exchange core and the bottom plate, which can be used to accommodate other components, such as a blower or a controller, and can also be used as an air inlet channel or as a maintenance space.

[0021] In a possible implementation, the heat exchange core also includes a first air inlet surface, a second air inlet surface, and a second air outlet surface, the first air inlet surface and the first air outlet surface are relatively arranged along a fourth direction, and the fourth direction intersects with the first direction, the second direction, and the third direction; the second air inlet surface and the second air outlet surface are relatively arranged along the fifth direction, the fifth direction intersects with the first direction, the second direction, and the third direction, and the fifth direction intersects with the fourth direction.

[0022] In a possible implementation, the housing further includes a first end plate and a second end plate disposed opposite to each other along the third direction, the first end plate and the first partition cover both ends of the first exhaust cavity along the third direction, so that the first exhaust cavity is sealed; the second end plate and the first partition cover both ends of the second exhaust cavity along the third direction, so that the second exhaust cavity is sealed. The extraction efficiency of the first exhaust fan and the second exhaust fan for outdoor cold air is improved.

[0023] In a possible implementation, the first air inlet surface intersects and is connected to the second side panel and the first support rod, and the first air inlet surface, the second side panel and the bottom panel enclose a first air inlet space.

[0024] In a possible implementation, the second air outlet surface intersects and is connected to the first side plate and the first support rod, the connection between the first air inlet surface and the second air outlet surface is located on the first side plate, the housing further comprises a bottom frame, the bottom frame is located between the heat exchange core and the bottom plate, and the bottom frame, the second air outlet surface and the first side plate are enclosed to form an air supply space. In one embodiment, the air supply space is a sealed space to improve air supply efficiency.

[0025] In a possible implementation, the second air inlet surface intersects and is connected to the second side panel and the top panel, the connection between the first air outlet surface and the second air inlet surface is located on the top panel, and the second air inlet surface and the second side panel and the top panel enclose a second air inlet space.

[0026] In one embodiment, the cross section of the heat exchange core is a rhombus. In some embodiments, the cross section of the heat exchange core may be a square or a rectangle.

[0027] In one embodiment, an orthographic projection of the first exhaust fan on the top plate along the first direction and an orthographic projection of the second exhaust fan on the top plate along the first direction are respectively located on both sides of an orthographic projection of the first partition on the top plate.

[0028] In a possible implementation, the first partition includes a first side, and the first side is rotatably connected to the first air outlet surface. The first side is rotatably connected to the first air outlet surface, so that the first side can rotate relative to the first air outlet surface, and when the first air outlet surface or components in the exhaust space need to be repaired, the first partition can be rotated and folded for easy repair or cleaning.

[0029] In one embodiment, the first side edge and the first air outlet surface are rotatably connected via a hinge.

[0030] In some embodiments, the first side edge is connected to the first air outlet surface via a detachable structure, which is convenient for maintenance. When maintenance is needed, the first side edge is separated from the first air outlet surface.

[0031] In a possible implementation, the first partition includes a first sub-plate and a second sub-plate that are rotatably connected, and a side of the first sub-plate away from the second sub-plate is adjacent to the top plate. When maintenance is required, the first sub-plate is rotated so that a side of the first sub-plate away from the second sub-plate is adjacent to the bottom of the exhaust space, and the first sub-plate and the second sub-plate are folded.

[0032] In a possible implementation, the first partition is triangular, the cross section of the exhaust space is triangular, and the shape of the exhaust space matches the first partition, so that the first partition divides the exhaust space into a first exhaust cavity and a second exhaust cavity, and the airflow in the first exhaust cavity and the second exhaust cavity does not flow to each other.

[0033] In one embodiment, the bottom of the exhaust space has a first connecting plate, the first connecting plate is connected between the heat exchange core and the first side plate, and the side of the second sub-plate away from the first sub-plate is adjacent to the first connecting plate. The second sub-plate is trapezoidal.

[0034] In one embodiment, the exhaust space has a second connecting plate on one side close to the second side plate, and the second connecting plate is connected between the heat exchange core and the top plate. At this time, the shape of the first sub-plate in the first partition plate is a pentagon.

[0035] In a possible implementation, the indirect evaporative cooling unit also includes a shell, the heat exchange core is located in the shell, the shell includes a top plate, the shell also includes a first sealing plate and a second sealing plate, the heat exchange core includes a first air outlet surface connected to the outdoor air duct, the first air outlet surface and the top plate are arranged opposite to each other along a first direction, the first sealing plate and the second sealing plate are located on both sides of the first air outlet surface along a second direction, the first sealing plate, the first air outlet surface, the second sealing plate and the top plate enclose an exhaust space, the first partition is located in the exhaust space and divides the exhaust space into the first exhaust cavity and the second exhaust cavity, and the first direction and the second direction intersect.

[0036] The first air outlet surface is parallel to the top plate. The cross section of the heat exchange core is rectangular or square. This structure is easy to install and maintain.

[0037] In a possible implementation, the shell also includes the bottom plate, the top plate and the bottom plate are arranged opposite to each other along the first direction, and the shell also includes a first side plate and a second side plate arranged opposite to each other along the second direction; the heat exchange core includes a first air outlet surface and a first air inlet surface arranged opposite to each other along the first direction, the first air outlet surface is located above the first air inlet surface, the heat exchange core also includes a second air inlet surface and a second air outlet surface arranged opposite to each other along the second direction, the second air inlet surface is adjacent to the first side plate, and the second air outlet surface is adjacent to the second side plate; the shell also includes a third sealing plate, the third sealing plate is located between the first side plate and the second air inlet surface, and is arranged closer to the first air inlet surface than the first air outlet surface, and the top plate, the first side plate, the third sealing plate, the second air inlet surface and the first sealing plate are connected in sequence and together enclose a second air inlet space.

[0038] In a possible implementation, the shell also includes a fourth sealing plate and a fifth sealing plate, the fifth sealing plate is located between the first air inlet surface and the bottom plate, the fourth sealing plate and the first side plate are arranged opposite to each other in the second direction, the fourth sealing plate is located between the first air inlet surface and the fifth sealing plate, and the fourth sealing plate is arranged closer to the second air outlet surface than the second air inlet surface, the first side plate, the first air inlet surface, the fourth sealing plate and the fifth sealing plate form a first air inlet space; the top plate, the second sealing plate, the second air outlet surface, the fourth sealing plate, the fifth sealing plate and the second side plate form an air supply space.

[0039] In a possible implementation, the shell further includes a second accommodation portion, the second accommodation portion is located on a side of the top plate away from the heat exchange core, and the first exhaust fan and the second exhaust fan are located in the second accommodation portion.

[0040] The second receiving part is used to provide an air duct receiving space for the first exhaust fan and the second exhaust fan, so that the discharged outdoor hot air can be temporarily received in the second receiving part. When the second exhaust fan is reversed, the received outdoor hot air can be sent back to the heat exchange core through the second exhaust fan to defrost the heat exchange core. The second receiving part can improve the defrosting effect. When the first exhaust fan is reversed, the received outdoor hot air can be sent back to the heat exchange core through the first exhaust fan to defrost the heat exchange core.

[0041] In a possible implementation, the first partition includes a third sub-plate and a fourth sub-plate arranged along the second direction, and the third sub-plate and the fourth sub-plate are rotatably connected. The third sub-plate is rotatably connected to the fourth sub-plate, so that the third sub-plate can rotate relative to the fourth sub-plate, so that when it is necessary to repair the first air outlet surface or the components in the exhaust space, the first partition can be rotated and folded for easy repair or cleaning.

[0042] In one embodiment, the third sub-plate and the fourth sub-plate are rotatably connected via a hinge.

[0043] In some embodiments, the third sub-board and the fourth sub-board are connected via a detachable structure, which is convenient for maintenance. When maintenance is needed, the third sub-board and the fourth sub-board are separated.

[0044] In a possible implementation, the indirect evaporative cooling unit also includes a third exhaust fan, a third exhaust chamber and a second partition, the third exhaust chamber is connected to the air outlet of the outdoor air duct, the third exhaust fan is located on the side of the third exhaust chamber away from the air outlet of the outdoor air duct, and the second partition is located between the second exhaust chamber and the third exhaust chamber to separate the second exhaust chamber and the third exhaust chamber; the controller is also used to control the third exhaust fan to be in the first state or the second state according to the temperature.

[0045] Among them, the first partition and the second partition divide the exhaust space into a first exhaust chamber, a second exhaust chamber and a third exhaust chamber. When the temperature is low, the controller controls one or two of the first exhaust fan, the second exhaust fan or the third exhaust fan to a non-exhaust state to defrost the heat exchange core, so that the indirect evaporative cooling unit has more ways to defrost when the temperature is extremely low, and the defrost methods are more flexible.

[0046] In a possible implementation, the outdoor air duct also includes a third outdoor sub-air duct, the air outlet of the third outdoor sub-air duct is connected to the third exhaust cavity, the first air outlet surface also includes a third area, the third area is located on the side of the second area away from the first area, the second area and the third area are separated by the second partition, and the side of the second partition adjacent to the first air outlet surface is located at the connection between the second area and the third area.

[0047] In a possible implementation, the indirect evaporative cooling unit further includes a first accommodation portion, which is located on a side of the top plate away from the heat exchange core, and the first exhaust fan and the second exhaust fan are located in the first accommodation portion. The first accommodation portion is used to provide an air duct accommodation space for the first exhaust fan and the second exhaust fan, so that the exhausted outdoor hot air can be temporarily accommodated in the first accommodation portion. When the second exhaust fan is reversed, the accommodated outdoor hot air can be sent back into the heat exchange core through the second exhaust fan to defrost the heat exchange core. The first accommodation portion can improve the defrosting effect. When the first exhaust fan is reversed, the accommodated outdoor hot air can be sent back into the heat exchange core through the first exhaust fan to defrost the heat exchange core.

[0048] In one embodiment, the first receiving portion is a closed cavity. When the first exhaust fan or the second exhaust fan is reversed, more outdoor hot air can be sent into the heat exchange core to defrost the heat exchange core, thereby improving the defrosting efficiency.

[0049] In a second aspect, the present application provides an antifreeze control method, which is applied to the indirect evaporative cooling unit as described in any one of the above items, and the antifreeze control method comprises:

[0050] Get temperature;

[0051] When the temperature is lower than a first preset temperature, the indirect evaporative cooling unit is controlled to an antifreeze mode;

[0052] When the temperature is greater than a second preset temperature, the indirect evaporative cooling unit switches to a normal operating mode; the second preset temperature is greater than the first preset temperature;

[0053] The control process of the antifreeze mode includes:

[0054] Controlling the first exhaust fan to the exhaust state and the second exhaust fan to the non-exhaust state, and the first exhaust fan and the second exhaust fan to operate for a first preset time;

[0055] Controlling the first exhaust fan to switch from the exhaust state to the non-exhaust state, controlling the second exhaust fan to switch from the non-exhaust state to the exhaust state, and the first exhaust fan and the second exhaust fan to operate for a second preset time;

[0056] In the normal operating mode:

[0057] The first exhaust fan and the second exhaust fan are controlled to be in exhaust state.

[0058] The antifreeze control method of the present application controls the indirect evaporative cooling unit to a prevention and control mode according to the temperature, and controls the first exhaust fan or the second exhaust fan to a non-exhaust state, so as to melt ice while ensuring the refrigeration demand of the indirect evaporative cooling unit, thereby improving the refrigeration efficiency of the indirect evaporative cooling unit and avoiding ice and rupture of the heat exchange core.

[0059] In a possible implementation, in the antifreeze mode, the rotation speeds of the first exhaust fan and the second exhaust fan in the exhaust state are the first rotation speed, and in the normal operation mode, the rotation speeds of the first exhaust fan and the second exhaust fan in the exhaust state are the second rotation speed, and the first rotation speed is greater than the second rotation speed. Compared with the normal operation mode, in which the first exhaust fan and the second exhaust fan simultaneously operate the cooling function, in the antifreeze mode, the efficiency of the normal operation of the cooling function of the first exhaust fan or the second exhaust fan is reduced, and even the cooling efficiency is halved. In order to ensure the cooling efficiency of the indirect evaporative cooling unit, the first rotation speed is controlled to be greater than the second rotation speed, so as to improve the cooling efficiency of the indirect evaporative cooling unit.

[0060] In a possible implementation, when the number of the first exhaust fan and the second exhaust fan is the same, the first speed is greater than or equal to twice the second speed. In the antifreeze mode, the first exhaust fan is in the exhaust state, the second exhaust fan is in the non-exhaust state, the first exhaust fan is used for cooling, and the second exhaust fan cannot be used for cooling. In order to ensure the cooling efficiency of the indirect evaporative cooling unit, the first speed is controlled to be greater than or equal to twice the second speed, so as to ensure that the cooling efficiency of the indirect evaporative cooling unit in the antifreeze mode is similar to that in the normal operating mode.

[0061] In a possible implementation, in the antifreeze mode, the non-exhaust state is a reverse state, the reverse rotation speed of the first exhaust fan or the second exhaust fan is a third rotation speed, the third rotation speed is less than the first rotation speed, and the direction of operation of the first exhaust fan in the reverse state is opposite to the direction of operation of the first exhaust fan in the normal operation mode. When the first exhaust fan and the second exhaust fan are in the reverse state, outdoor hot air is driven into the outdoor air duct to improve the ice melting efficiency of the heat exchange core.

[0062] In a possible implementation, the antifreeze mode further includes controlling the value of the first speed according to the temperature. When entering the antifreeze mode, the temperature is different from the temperature in the normal operating mode. For example, the outdoor temperature in the antifreeze mode is lower than the outdoor temperature in the normal operating mode. At this time, the controller needs to adjust the first speed according to the outdoor temperature to ensure the refrigeration efficiency of the indirect evaporative cooling unit in the antifreeze mode.

[0063] In a possible implementation, when the temperature is greater than the second preset temperature, in the normal operation mode, the controller is further configured to control the value of the second speed according to the temperature. That is, in the normal operation mode, the second speed needs to be adjusted according to the temperature to save energy while meeting the cooling demand.

[0064] In a possible implementation, when the temperature is lower than the first preset temperature, the indirect evaporative cooling unit controls to run the antifreeze mode multiple times, and when the temperature is greater than or equal to the third preset temperature and lower than the first preset temperature, the interval between two adjacent antifreeze modes is a first time period, and the third preset temperature is lower than the first preset temperature; when the temperature is lower than the third preset temperature, the interval between two adjacent antifreeze modes is a second time period, and the second time period is lower than the first time period. That is, the lower the temperature, the shorter the interval between running the antifreeze mode, so as to improve the antifreeze effect.

[0065] In a possible implementation, when the indirect evaporative cooling unit includes a third exhaust fan, the control process of the antifreeze mode includes:

[0066] Controlling the first exhaust fan and the second exhaust fan to be in an exhaust state, the third exhaust fan to be in a non-exhaust state, and the first exhaust fan, the second exhaust fan, and the third exhaust fan to operate for a third preset time;

[0067] Controlling the first exhaust fan and the third exhaust fan to be in an exhaust state, the second exhaust fan to be in a non-exhaust state, and the first exhaust fan, the second exhaust fan and the third exhaust fan to operate for a fourth preset time;

[0068] The second exhaust fan and the third exhaust fan are controlled to be in an exhaust state, the first exhaust fan is controlled to be in a non-exhaust state, and the first exhaust fan, the second exhaust fan and the third exhaust fan are controlled to operate for a fifth preset time.

[0069] By controlling one of the three exhaust fans, namely the first exhaust fan, the second exhaust fan and the third exhaust fan, to be in a non-exhaust state in turn to defrost the corresponding outdoor air duct portion, defrosting control is made more precise, and keeping the two exhaust fans in the exhaust state can ensure the refrigeration effect of the indirect evaporative cooling unit.

[0070] In a possible implementation, in the antifreeze mode, the rotation speeds of the first exhaust fan, the second exhaust fan, and the third exhaust fan when they are in the exhaust state are the fourth rotation speed, and in the normal operation mode, the rotation speeds of the first exhaust fan, the second exhaust fan, and the third exhaust fan when they are in the exhaust state are the second rotation speed, and the fourth rotation speed is greater than the second rotation speed. Compared with the normal operation mode, in which the first exhaust fan, the second exhaust fan, and the third exhaust fan simultaneously run the cooling function, in the antifreeze mode, the efficiency of the normal operation cooling function of two of the first exhaust fan, the second exhaust fan, and the third exhaust fan is reduced. In order to ensure the cooling efficiency of the indirect evaporative cooling unit, the fourth rotation speed is controlled to be greater than the second rotation speed, thereby improving the cooling efficiency of the indirect evaporative cooling unit.

[0071] In a possible implementation, when the indirect evaporative cooling unit includes a third exhaust fan, the control process of the antifreeze mode includes:

[0072] Controlling the first exhaust fan to be in an exhaust state, the second exhaust fan and the third exhaust fan to be in a non-exhaust state, and the first exhaust fan, the second exhaust fan and the third exhaust fan to operate for a sixth preset time;

[0073] Controlling the third exhaust fan to be in an exhaust state, the first exhaust fan and the second exhaust fan to be in a non-exhaust state, and the first exhaust fan, the second exhaust fan and the third exhaust fan to operate for a seventh preset time;

[0074] The second exhaust fan is controlled to be in an exhaust state, the first exhaust fan and the third exhaust fan are controlled to be in a non-exhaust state, and the first exhaust fan, the second exhaust fan and the third exhaust fan are operated for an eighth preset time.

[0075] By controlling two of the three exhaust fans, namely the first exhaust fan, the second exhaust fan and the third exhaust fan, to be in a non-exhaust state in turn to defrost the corresponding outdoor air duct portion, defrosting control is made more precise, and keeping the two exhaust fans in a non-exhaust state can improve the defrosting efficiency of the indirect evaporative cooling unit.

[0076] In a third aspect, the present application provides a data center, comprising a computer room, a server, and an indirect evaporative cooling unit as described in any one of the above items, wherein the server is located in the computer room, and the indirect evaporative cooling unit is used to dissipate heat from the server.

[0077] In a possible implementation, the indirect evaporative cooling unit is located outside the computer room, and the first air supply duct and the second air supply duct are provided between the indirect evaporative cooling unit and the computer room. The second air supply duct is used to send the indoor hot air in the computer room into the indirect evaporative cooling unit to be cooled into indoor cold air, and the indoor cold air is sent back to the computer room through the first air supply duct to cool the server. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0079] Figure 1 It is a structural schematic diagram of a data center provided by an embodiment of the present application;

[0080] Figure 2 It is a structural schematic diagram of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0081] Figure 3 A schematic structural diagram of a heat exchange core in an indirect evaporative cooling unit provided in one embodiment of the present application;

[0082] Figure 4 is a side view of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0083] Figure 5 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0084] Figure 6 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0085] Figure 7 It is a schematic diagram of a heat exchange core in an indirect evaporative cooling unit provided in an embodiment of the present application in an antifreeze mode;

[0086] Figure 8 It is a structural schematic diagram of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0087] Fig. 9 It is a structural schematic diagram of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0088] Fig.10 It is a structural schematic diagram of a first baffle in an indirect evaporative cooling unit provided in one embodiment of the present application;

[0089] Fig.11 It is a structural schematic diagram of a first baffle in an indirect evaporative cooling unit provided in one embodiment of the present application;

[0090] Fig.12 It is a structural schematic diagram of a first baffle in an indirect evaporative cooling unit provided in one embodiment of the present application;

[0091] Fig.13 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0092] Fig.14 A schematic diagram of a heat exchange core in an indirect evaporative cooling unit in an antifreeze mode provided in one embodiment of the present application;

[0093] Fig.15 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0094] Fig.16 A schematic diagram of a heat exchange core in an indirect evaporative cooling unit in an antifreeze mode provided in one embodiment of the present application;

[0095] Fig.17 It is a structural schematic diagram of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0096] Fig.18 A schematic structural diagram of a heat exchange core in an indirect evaporative cooling unit provided in one embodiment of the present application;

[0097] Fig.19 It is a structural schematic diagram of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0098] Fig. 20 is a side view of an indirect evaporative cooling unit provided in one embodiment of the present application;

[0099] Fig.21 It is a structural schematic diagram of a first baffle in an indirect evaporative cooling unit provided in one embodiment of the present application;

[0100] Fig. 22 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0101] Fig.23 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0102] Fig.24 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0103] Fig.25 is a schematic diagram of an indirect evaporative cooling unit in an antifreeze mode provided by an embodiment of the present application;

[0104] Fig.26 is a flow chart of an antifreeze control method provided in one embodiment of the present application;

[0105] Fig. 27 yes Fig.26 Sub-flow chart of step S20;

[0106] Fig.28 yes Fig.26 Sub-flow chart of step S20;

[0107] Fig.29 yes Fig.26 Sub-flow chart of step S20 in . DETAILED DESCRIPTION

[0108] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0109] In this document, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0110] In addition, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the change of the orientation of the structure.

[0111] See also Figure 1 An embodiment of the present application provides a data center 1, including a computer room 11, a server 12 and an indirect evaporative cooling unit 10. The server 12 is located in the computer room 11, and the indirect evaporative cooling unit 10 is used to dissipate heat for the server 12.

[0112] The data center 1 is a globally collaborative network of specific equipment used to transmit, accelerate, display, calculate and store data information on a network infrastructure. The indirect evaporative cooling unit 10 is widely used in major data centers 1 due to its low energy consumption and large cooling capacity. The data center 1 generally has a large number of servers 12. The servers 12 will generate a lot of heat when working. The heating of the servers 12 will affect the work efficiency. It is necessary to cool down the computer room 11 in time to cool down the servers 12. The indirect evaporative cooling unit 10 cools down the indoor hot air H1 in the data center 1 into indoor cold air C1 to cool down the data center 1.

[0113] In one embodiment, the indirect evaporative cooling unit 10 is located outside the computer room 11, and a first air supply duct 13 and a second air supply duct 14 are provided between the indirect evaporative cooling unit 10 and the computer room 11. The second air supply duct 14 is used to send the indoor hot air H1 in the computer room 11 into the indirect evaporative cooling unit 10 to be cooled into indoor cold air C1, and the indoor cold air C1 is sent back to the computer room 11 through the first air supply duct 13 to cool the server 12.

[0114] See also Figure 2 , Figure 2 This is a structural schematic diagram of an indirect evaporative cooling unit 10 provided in one embodiment of the present application. The indirect evaporative cooling unit 10 includes a heat exchange core 100, a first exhaust cavity 210, a second exhaust cavity 220, a first partition 310, a first exhaust fan 410 and a second exhaust fan 420.

[0115] The heat exchange core 100 includes an outdoor air duct 110, which refers to a channel for outdoor cold air C2 to circulate, or a channel for cold air from the external environment to circulate. The heat exchange core 100 also includes an indoor air duct 120, which refers to a channel for indoor hot air H1 to circulate. Indoor refers to the interior of the computer room 11 of the data center 1, and the indoor hot air H1 refers to the hot air inside the computer room 11. The outdoor air duct 110 and the indoor air duct 120 are non-connected channels in the heat exchange core 100, and the channel walls of the two are adjacent to each other, and heat exchange is performed through the channel walls. When the outdoor cold air C2 flows through the outdoor air duct 110, the channel wall of the outdoor air duct 110 is cooled, and when the indoor hot air H1 flows through the indoor air duct 120, the channel wall of the indoor air duct 120 is heated. Heat exchange occurs between the channel walls of the outdoor air duct 110 and the indoor air duct 120, and then heat exchange is performed on the airflow in the outdoor air duct 110 and the indoor air duct 120, so as to cool the indoor hot air H1 in the indoor air duct 120 into the indoor cold air C1, and heat up the outdoor cold air C2 in the outdoor air duct 110 into the outdoor hot air H2, and the indoor cold air C1 is sent back to the machine room 11 (such as Figure 1 As shown), to cool the server 12.

[0116] Among them, the first exhaust cavity 210 and the second exhaust cavity 220 are both connected to the air outlet of the outdoor air duct 110. The first exhaust cavity 210 and the second exhaust cavity 220 both refer to the area outside the heat exchange core 100. In one embodiment, the first exhaust cavity 210 and the second exhaust cavity 220 are areas adjacent to the air outlet of the outdoor air duct 110. The outdoor cold air C2 from the air outlet of the outdoor air duct 110 is discharged through the first exhaust cavity 210 and the second exhaust cavity 220. The first partition 310 separates the first exhaust cavity 210 and the second exhaust cavity 220. Separation means that the first exhaust cavity 210 and the second exhaust cavity 220 are not connected. It should be understood that, within the range of process error, the first exhaust chamber 210 and the second exhaust chamber 220 are allowed to have a small gap, and the first partition plate 310 separates the first exhaust chamber 210 and the second exhaust chamber 220 as a whole, so that the outdoor wind in the first exhaust chamber 210 will not flow into the second exhaust chamber 220, and the outdoor wind in the second exhaust chamber 220 will not flow into the first exhaust chamber 210.

[0117] The first exhaust cavity 210 and the second exhaust cavity 220 are both connected to the air outlet of the outdoor air duct 110. It can be understood that a portion of the air outlet of the outdoor air duct 110 is connected to the first exhaust cavity 210, and a portion of the air outlet of the outdoor air duct 110 is connected to the second exhaust cavity 220, so that the first exhaust cavity 210 and the second exhaust cavity 220 are both connected to the air outlet of the outdoor air duct 110.

[0118] Please combine Figure 2 and Figure 3 , Figure 3 It is a structural schematic diagram of the heat exchange core 100. In a possible implementation, in the heat exchange core 100, the outdoor air duct 110 includes a first outdoor sub-air duct 111 connected to the first exhaust chamber 210 and a second outdoor sub-air duct 112 connected to the second exhaust chamber 220. The air outlet of the first outdoor sub-air duct 111 is connected to the first exhaust chamber 210, and the air outlet of the second outdoor sub-air duct 112 is connected to the second exhaust chamber 220.

[0119] Please continue reading Figure 3 In a possible implementation, the outdoor air duct 110 and the indoor air duct 120 are arranged crosswise, wherein the outdoor air duct 110 includes a plurality of outdoor sub-air ducts 102, the first outdoor sub-air duct 111 includes a portion of the plurality of outdoor sub-air ducts 102, and the second outdoor sub-air duct 112 includes a portion of the plurality of outdoor sub-air ducts 102. The indoor air duct 120 includes a plurality of indoor sub-air ducts 103, each indoor sub-air duct 103 is arranged adjacent to the outdoor sub-air duct 102, so that the indoor hot air H1 in the indoor sub-air duct 103 and the outdoor cold air C2 in the outdoor sub-air duct 102 are heat exchanged to reduce the temperature. The outdoor air duct 110 and the indoor air duct 120 in the heat exchange core 100 are not limited to Figure 3The structure shown in the figure, the cross-section of the outdoor sub-duct 102 and the indoor sub-duct 103 is not limited to Figure 3 The circle in the figure only needs to satisfy the requirement that the outdoor air duct 110 and the indoor air duct 120 are not connected.

[0120] Please continue reading Figure 2 The first exhaust fan 410 and the second exhaust fan 420 are respectively located at the side of the first exhaust cavity 210 and the second exhaust cavity 220 away from the air outlet of the outdoor air duct 110. In the normal operation mode, the first exhaust fan 410 and the second exhaust fan 420 are respectively used to drive the outdoor cold air C2 to pass through the outdoor air duct 110 and then be discharged from the first exhaust cavity 210 and the second exhaust cavity 220.

[0121] The indirect evaporative cooling unit 10 also includes a controller 500, which is used to control the first exhaust fan 410 to a first state according to the temperature, and to control the second exhaust fan 420 to a second state, wherein the first state is one of the exhaust state and the non-exhaust state, and the second state is the other of the exhaust state and the non-exhaust state.

[0122] The exhaust state refers to the normal operation of the first exhaust fan 410 and the second exhaust fan 420, so that the first exhaust fan 410 and the second exhaust fan 420 drive the outdoor cold air C2 into the outdoor air duct 110, and discharge the outdoor hot air H2 after heat exchange from the outdoor air duct 110. The non-exhaust state refers to not starting the first exhaust fan 410 or the second exhaust fan 420, or reversing the first exhaust fan 410 or the second exhaust fan 420 so that the outdoor cold air C2 is sent back to the outdoor air duct 110 after the outdoor hot air H2 is heat exchanged by the heat exchange core 100, so as to heat and defrost the outdoor air duct 110, that is, the non-exhaust state includes not exhausting air to the outside and sending air to the outdoor air duct 110. When the normal operation direction of the first row of fans 410 and the second row of fans 420 is clockwise, the operation direction of the first row of fans 410 and the second row of fans 420 when they are reversed is counterclockwise; when the normal operation direction of the first row of fans 410 and the second row of fans 420 is counterclockwise, the operation direction of the first row of fans 410 and the second row of fans 420 when they are reversed is clockwise.

[0123] The number of the first exhaust fans 410 and the second exhaust fans 420 may be the same or different. Generally, for ease of control, the number of the first exhaust fans 410 and the second exhaust fans 420 are set to be the same, and the first exhaust fans 410 and the second exhaust fans 420 have the same shape and size, so that under the same motor drive, the first exhaust fans 410 and the second exhaust fans 420 have the same exhaust efficiency.

[0124] See also Figure 4 , Figure 4: is a side view of the indirect evaporative cooling unit 10 in this embodiment. In this embodiment, the indirect evaporative cooling unit 10 further includes a blower 600, which is used to drive the indoor hot air H1 into the indoor air duct 120. Among them, the first exhaust fan 410, the second exhaust fan 420 and the blower 600 can all be fans. The first exhaust fan 410 and the second exhaust fan 420 are used to discharge the outdoor hot air H2 heated by the heat exchange core 100 out of the indirect evaporative cooling unit 10, and the blower 600 is used to discharge the indoor cold air C1 cooled by the heat exchange core 100 out of the indirect evaporative cooling unit 10 and send it back to the room.

[0125] like Figure 4 As shown, in this embodiment, when the indirect evaporative cooling unit 10 is in the normal operating mode, the first exhaust fan 410 and the second exhaust fan 420 are in the exhaust state. At this time, the first exhaust fan 410 and the second exhaust fan 420 are used to drive the outdoor cold air C2 into the outdoor air duct 110, and is cooled by heat exchange in the heat exchange core 100 to become the outdoor hot air H2. The first exhaust fan 410 and the second exhaust fan 420 draw the outdoor hot air H2 that has undergone heat exchange into the first exhaust cavity 210 and the second exhaust cavity 220, and discharge it from the indirect evaporative cooling unit 10. The temperature is the outdoor temperature. When the outdoor temperature is too low, the temperature of the outdoor cold air C2 will also be low. When the indirect evaporative cooling unit 10 is in normal operating mode, the low-temperature outdoor cold air C2 enters the outdoor air duct 110, and will cool the water vapor in the indoor hot air H1 in the indoor air duct 120 to ice. A lot of ice in the indoor air duct 120 will block the indoor air duct 120, thereby affecting the circulation of the indoor hot air H1, reducing the cooling efficiency of the indirect evaporative cooling unit 10. In some cases, ice will also form in the outdoor air duct 110. When the heat exchange core 100 is severely frozen, there is a risk of rupture.

[0126] See also Figure 5 , Figure 5 Schematic diagram of the indirect evaporative cooling unit 10 in the antifreeze mode in this embodiment. In one embodiment, the indirect evaporative cooling unit 10 is in the antifreeze mode, and the controller 500 controls the first exhaust fan 410 to be in the exhaust state according to the temperature, and controls the second exhaust fan 420 to be in the non-exhaust state, wherein the non-exhaust state is that the second exhaust fan 420 is not running. That is, the first exhaust fan 410 is normally exhausting, and the second exhaust fan 420 is not exhausting. Please refer to Figure 3 and Figure 5 ,like Figure 5As shown, when the temperature is low, the indirect evaporative cooling unit 10 is in the antifreeze mode, the first exhaust fan 410 exhausts air normally to meet the cooling demand of the indirect evaporative cooling unit 10 for the data center 1, the second exhaust fan 420 does not operate, and the first exhaust fan 410 exhausts air normally, which can drive the outdoor cold air C2 to enter the part of the outdoor air duct 110 corresponding to the first exhaust fan 410, for example, the outdoor cold air C2 enters the first outdoor sub-air duct 111 (such as Figure 3 As shown), and discharged from the indirect evaporative cooling unit 10 through the first exhaust cavity 210; while the second exhaust fan 420 does not exhaust air, and the second exhaust cavity 220 is separated from the first exhaust cavity 210 by the first partition 310, so that no outdoor cold air C2 enters the part of the outdoor air duct 110 corresponding to the second exhaust cavity 220, for example, no outdoor cold air C2 enters the second outdoor sub-air duct 112 (as shown). Figure 3 As shown in the figure, at this time, the second outdoor sub-duct 112 does not have continuous outdoor cold air C2 to cool down, while the indoor air duct 120 has continuous indoor hot air H1 entering, which can heat up the second outdoor sub-duct 112 to defrost the second outdoor sub-duct 112, that is, defrost the part of the outdoor air duct 110 corresponding to the second exhaust chamber 220, and the indoor hot air H1 can also defrost the part of the indoor air duct 120 adjacent to the second outdoor sub-duct 112, so that the part of the indoor air duct 120 and the second outdoor sub-duct 112 are evenly defrosted, thereby increasing the air flow speed. When the first partition 310 is located exactly in the middle of the heat exchange core 100, half of the heat exchange core 100 can be defrosted, as shown in the figure. Figure 5 The portion Q encircled by the dotted line in the figure is the ice melting area.

[0127] When the defrosting area Q is defrosted, the controller 500 controls the first exhaust fan 410 to a non-exhaust state and controls the second exhaust fan 420 to an exhaust state according to the temperature. Figure 6 and Figure 7 , Figure 6 is a schematic diagram of the indirect evaporative cooling unit 10 in the antifreeze mode in this embodiment, Figure 7 Schematic diagram of the heat exchange core 100 in the indirect evaporative cooling unit 10 in the present embodiment in the antifreeze mode. At this time, part of the outdoor air duct 110 corresponding to the first exhaust cavity 210 is thawed, for example, the first outdoor sub-air duct 111 is thawed, and part of the indoor air duct 120 adjacent to the first outdoor sub-air duct 111 can also be thawed. When the first exhaust fan 410 and the second exhaust fan 420 are set to the non-exhaust state in turn, the indoor air duct 120 and the outdoor air duct 110 are both thawed, the air flow speed in the heat exchange core 100 is increased, and the heat exchange effect of the indirect evaporative cooling unit 10 is improved.

[0128] The indirect evaporative cooling unit 10 provided in the present application separates the first exhaust chamber 210 and the second exhaust chamber 220 by the first partition plate 310, and controls the first exhaust fan 410 to be in the first state and the second exhaust fan 420 to be in the second state according to the temperature through the controller 500, so that the indirect evaporative cooling unit 10 can be defrosted when the temperature is low, thereby increasing the air flow rate in the heat exchange core 100 and improving the heat exchange effect of the indirect evaporative cooling unit 10; in addition, the risk of the heat exchange core 100 breaking due to ice can be avoided.

[0129] In a possible implementation, the temperature is the outdoor temperature or the heat exchange core wall 101 (such as Figure 2 The controller 500 controls the first exhaust fan 410 to be in the first state and the second exhaust fan 420 to be in the second state according to the outdoor temperature or the temperature of the heat exchange core wall 101. The controller 500 is electrically connected to the first exhaust fan 410 and the second exhaust fan 420.

[0130] In a possible implementation, the indirect evaporative cooling unit 10 further includes a temperature sensor 700 (eg, Figure 2 As shown), the temperature sensor 700 is used to detect the outdoor temperature or the temperature of the heat exchange core wall 101. The controller 500 is connected to the temperature sensor 700 to obtain the temperature detected by the temperature sensor 700. The temperature sensor 700 can be set at the air inlet of the outdoor air duct 110, or can be set on the heat exchange core wall 101. In some embodiments, the temperature received by the controller 500 can also be obtained by manual detection and input to the controller 500. In some embodiments, the temperature can be obtained through a terminal, for example, the controller 500 is connected to a terminal (not shown in the figure), the terminal can obtain the ambient temperature, and transmit the ambient temperature to the controller 500, and the controller 500 controls the first exhaust fan 410 to the first state according to the ambient temperature, and controls the second exhaust fan 420 to the second state. That is to say, the controller 500 can obtain the temperature through the temperature sensor 700 provided by the indirect evaporative cooling unit 10, or can obtain the temperature through manual input or from the terminal.

[0131] Please continue reading Figure 2In a possible implementation, the indirect evaporative cooling unit 10 further includes a shell 800, the heat exchange core 100 is located in the shell 800, the shell 800 includes a first side plate 810 and a top plate 820, the first side plate 810 and the top plate 820 intersect and connect, the heat exchange core 100 includes a first air outlet surface 130 communicating with the outdoor air duct 110, the first air outlet surface 130 intersects and connects with the first side plate 810 and the top plate 820, the first air outlet surface 130, the first side plate 810 and the top plate 820 are arranged to form an exhaust space 200, the first partition plate 310 is located in the exhaust space 200 and divides the exhaust space 200 into a first exhaust cavity 210 and a second exhaust cavity 220. In this embodiment, the exhaust space 200 is in the shape of a triangular prism, and the first exhaust cavity 210 and the second exhaust cavity 220 are also in the shape of a triangular prism.

[0132] See also Figure 8 , Figure 8 2 is a schematic diagram of the structure of the indirect evaporative cooling unit 10. The top plate 820 portion constituting the first exhaust cavity 210 is referred to as the first top plate sub-portion 821. Figure 8 As shown in the area filled with a "cross" in the middle, the first side plate 810 part constituting the first exhaust cavity 210 is recorded as the first side plate sub-part 811. Figure 8 The portion of the top plate 820 constituting the second exhaust cavity 220 is denoted as the second top plate sub-portion 822. Figure 8 As shown in the area filled with small black dots, the first side plate 810 portion constituting the second exhaust cavity 220 is recorded as the second side plate portion 812. Figure 8 The first air outlet surface 130 includes a first area 131 and a second area 132, the first area 131 and the second area 132 are separated by a first partition plate 310, the first area 131 is connected to the first exhaust cavity 210, the first top plate sub-portion 821, the first side plate sub-portion 811 and the first area 131 are arranged to form the first exhaust cavity 210, the second area 132 is connected to the second exhaust cavity 220, the second top plate sub-portion 822, the second side plate sub-portion 812 and the second area 132 are arranged to form the second exhaust cavity 220.

[0133] like Figure 8As shown, the first exhaust fan 410 and the second exhaust fan 420 are located on the side of the top plate 820 away from the heat exchange core 100. In this embodiment, the top plate 820 is located above the heat exchange core 100, so the first exhaust fan 410 is located above the first top plate sub-portion 821, and the second exhaust fan 420 is located above the second top plate sub-portion 822. Among them, the first top plate sub-portion 821 is provided with an air outlet hole (not shown in the figure) penetrating the first top plate sub-portion 821, the first exhaust fan 410 is connected to the air outlet hole of the first top plate sub-portion 821, the second top plate sub-portion 822 is provided with an air outlet hole (not shown in the figure) penetrating the second top plate sub-portion 822, and the second exhaust fan 420 is connected to the air outlet hole of the second top plate sub-portion 822. When the first exhaust fan 410 is in operation, the air in the first exhaust cavity 210 is driven to be discharged, the air pressure in the first exhaust cavity 210 is reduced, the airflow in the outdoor air duct 110 corresponding to the first exhaust cavity 210 is driven to enter the first exhaust cavity 210, and the outdoor cold air C2 is sucked into the outdoor air duct 110. When the second exhaust fan 420 is in operation, the air in the second exhaust cavity 220 is driven to be discharged, the air pressure in the second exhaust cavity 220 is reduced, the airflow in the outdoor air duct 110 corresponding to the second exhaust cavity 220 is driven to enter the second exhaust cavity 220, and the outdoor cold air C2 is sucked into the outdoor air duct 110. Since the outdoor cold air C2 in the outdoor air duct 110 is heated to become the outdoor hot air H2, the airflow with a higher temperature will flow upward, and the first exhaust fan 410 and the second exhaust fan 420 are arranged above the top plate 820, which is conducive to the discharge of the outdoor hot air H2.

[0134] See also Fig. 9 In a possible implementation, the first exhaust fan 410 is located on a side of the first side plate portion 811 away from the heat exchange core 100. Fig. 9 In the embodiment, the first side plate 810 is located on the right side of the heat exchange core 100 , the first exhaust fan 410 is located on the right side of the first side plate portion 811 , and the second exhaust fan 420 is located on the right side of the second top plate portion 822 .

[0135] Please continue reading Figure 8In a possible implementation, the shell 800 further includes a second side plate 830, a first support rod 840, a second support rod 850 and a bottom plate 860, the first side plate 810 and the second side plate 830 are arranged relatively to each other along the second direction Y, the top plate 820 and the bottom plate 860 are arranged relatively to each other along the first direction X, the first support rod 840 and the second support rod 850 are located between the top plate 820 and the bottom plate 860, one end of the heat exchange core 100 along the third direction Z is fixed between the top plate 820 and the first support rod 840, and the other end of the heat exchange core 100 along the third direction Y is fixed between the top plate 820 and the second support rod 850, wherein the first direction X intersects the second direction Y perpendicularly, and the third direction Z intersects the first direction X and the second direction Y perpendicularly, respectively. Among them, the heat exchange core 100 is arranged between the first support rod 840, the second support rod 850 and the top plate 820, so that space is reserved between the heat exchange core 100 and the bottom plate 860, which can be used to accommodate other components, such as the air blower 600 or the controller 500, and can also be used as an air inlet channel or as a maintenance space.

[0136] In one embodiment, the first direction X is the height direction of the indirect evaporative cooling unit 10, the second direction Y is the width direction of the indirect evaporative cooling unit 10, and the third direction Z is the length direction of the indirect evaporative cooling unit 10. In one embodiment, the first direction X is the height direction of the indirect evaporative cooling unit 10, the second direction Y is the length direction of the indirect evaporative cooling unit 10, and the third direction Z is the width direction of the indirect evaporative cooling unit 10.

[0137] Please continue reading Figure 8 In one embodiment, the heat exchange core 100 further includes a first air inlet surface 140, a second air inlet surface 150, a second air outlet surface 160, a first end surface 170, and a second end surface 180. The first air inlet surface 140 and the first air outlet surface 130 are arranged opposite to each other along a fourth direction S, and the fourth direction S intersects with the first direction X, the second direction Y, and the third direction Z. The first air inlet surface 140 and the first air outlet surface 130 are located at both ends of the outdoor air duct 110 and are connected to the outdoor air duct 110. The outdoor cold air C2 enters the outdoor air duct 110 from the first air inlet surface 140, and becomes the outdoor hot air H2 after heat exchange in the heat exchange core 100. The outdoor hot air H2 is discharged from the first air outlet surface 130. Figure 7 and Figure 8 In one embodiment, the first air outlet surface 130 includes a first area 131 located at the air outlet of the first outdoor sub-air duct 111 and a second area 132 located at the air outlet of the second outdoor sub-air duct 112. The first area 131 is connected to the first exhaust cavity 210, and the second area 132 is connected to the second exhaust cavity 220.

[0138] Please continue reading Figure 8, wherein the second air inlet surface 150 and the second air outlet surface 160 are arranged opposite to each other along the fifth direction W, the fifth direction W intersects with the first direction X, the second direction Y, and the third direction Z, and the fifth direction W intersects with the fourth direction S. The second air inlet surface 150 and the second air outlet surface 160 are located at both ends of the indoor air duct 120 and are connected to the indoor air duct 120. The indoor hot air H1 enters the indoor air duct 120 from the second air inlet surface 150, and becomes the indoor cold air C1 after heat exchange in the heat exchange core 100. The indoor cold air C1 is discharged from the second air outlet surface 160 and enters the room to cool the room. For example, when the indirect evaporative cooling unit 10 is applied to the data center 1, the indoor cold air C1 is discharged from the second air outlet surface 160 and sent to the computer room 11 of the data center 1 through the first air supply duct 13 to cool the servers in the computer room 11.

[0139] Among them, compared with the second side plate 830, the first air outlet surface 130 and the second air outlet surface 160 are arranged adjacent to the first side plate 810; compared with the first side plate 810, the first air inlet surface 140 and the second air inlet surface 150 are arranged adjacent to the second side plate 830, and the first air outlet surface 130 and the second air inlet surface 150 are located on the side of the second air outlet surface 160 and the first air inlet surface 140 away from the bottom plate 860, that is, the first air outlet surface 130 and the second air inlet surface 150 are located above the second air outlet surface 160 and the first air inlet surface 140. Generally, hot air will flow upward and cold air will flow downward. In this embodiment, the first air outlet surface 130 is arranged at the top, so that the outdoor hot air H2 can be discharged from the outdoor air duct 110 more smoothly and leave the heat exchange core 100, and the second air outlet surface 160 is arranged at the bottom, so that the indoor cold air C1 can be discharged from the indoor air duct 120 more smoothly and leave the heat exchange core 100. In other embodiments, compared to the first side panel 810, the first air outlet surface 130 and the second air outlet surface 160 are arranged adjacent to the second side panel 830; compared to the second side panel 830, the first air inlet surface 140 and the second air inlet surface 150 are arranged adjacent to the first side panel 810, and the first air outlet surface 130 and the second air inlet surface 150 are located on the side of the second air outlet surface 160 and the first air inlet surface 140 away from the bottom plate 860.

[0140] The first end surface 170 and the second end surface 180 are disposed opposite to each other along the third direction Z. Figure 8In this embodiment, the first end surface 170 is arranged on the same side as the first support rod 840, and the second end surface 180 is arranged on the same side as the second support rod 850. In one embodiment, the housing 800 further includes a first end plate (not shown in the figure) and a second end plate (not shown in the figure) arranged opposite to each other along the third direction Z, the first end plate is arranged on the same side as the first end surface 170, and the second end plate is arranged on the same side as the second end surface 180, the first end plate and the first partition plate 310 cover both ends of the first exhaust cavity 210 along the third direction Z, so that the first exhaust cavity 210 is sealed, and the exhaust efficiency of the first exhaust fan 410 for the outdoor cold air C2 is improved, and the second end plate and the first partition plate 310 cover both ends of the second exhaust cavity 220 along the third direction Z, so that the second exhaust cavity 220 is sealed, and the exhaust efficiency of the second exhaust fan 420 for the outdoor cold air C2 is improved.

[0141] In this embodiment, the first air inlet surface 140 intersects and is connected with the second side plate 830 and the first support rod 840. The first air inlet surface 140, the second side plate 830 and the bottom plate 860 enclose a first air inlet space 910. The outdoor cold air C2 in the external space of the indirect evaporative cooling unit 10 flows through the first air inlet space 910 and then enters the outdoor air duct 110 from the first air inlet surface 140. The first air inlet space 910 is connected to the external space. The first air inlet space 910 can be an open space connected to the external space, or the first air inlet space 910 is a closed space, and the closed first air inlet space 910 has an outdoor air inlet 808 connected to the external space (such as Figure 4 or Figure 5 As shown in FIG. 1 , the outdoor cold air in the external space is delivered to the first air inlet space 910 through the outdoor air inlet 808. In some embodiments, a filter may be provided on the outdoor air inlet 808 to filter the outdoor cold air to prevent debris in the air from clogging the outdoor air duct 110.

[0142] In this embodiment, the second air outlet surface 160 intersects and connects with the first side plate 810 and the first support rod 840, and the connection between the first air inlet surface 140 and the second air outlet surface 160 is located on the first side plate 810. The housing 800 further includes a bottom frame 801, which is located between the heat exchange core 100 and the bottom plate 860, and the bottom frame 801, the second air outlet surface 160, and the first side plate 810 are surrounded by an air supply space 920, and the air blower 600 is located in the air supply space 920. Figure 1 In the data center 1 shown, a first air supply duct 13 is provided on the outside of the air supply space 920 , and the first air supply duct 13 connects the air supply space 920 and the inside of the data center 1 , and the cooled indoor cold air C1 is delivered into the inside of the data center 1 through the first air supply duct 13 .

[0143] In one embodiment, the air supply space 920 is a sealed space to improve air supply efficiency. The structure of the air supply space 920 is not limited to Figure 8 The structure shown can also be constructed with an air supply cavity formed by other sealing plates, so that the indoor cold air C1 from the second air outlet surface 160 is sent into the first air supply duct 13 through the air supply cavity and enters the interior of the data center 1. In other embodiments, the number, size, specific installation position and installation method of the air supply fan 600 can be set according to actual needs.

[0144] In this embodiment, the second air inlet surface 150 intersects and connects with the second side plate 830 and the top plate 820. The connection between the first air outlet surface 130 and the second air inlet surface 150 is located on the top plate 820. The second air inlet surface 150, the second side plate 830 and the top plate 820 are surrounded by a second air inlet space 930. Figure 1 In the data center 1 shown, the second air inlet space 930 is connected to the second air supply duct 14. After the indoor hot air H1 enters the second air inlet space 930 from the second air supply duct 14, it enters the indoor air duct 120 from the second air inlet surface 150. The second air inlet space 930 is a sealed space to improve air supply efficiency.

[0145] In this embodiment, the cross section of the heat exchange core 100 is a rhombus. In some embodiments, the cross section of the heat exchange core 100 may be a square or a rectangle.

[0146] In one embodiment, the orthographic projection of the first exhaust fan 410 on the top plate 820 along the first direction X and the orthographic projection of the second exhaust fan 420 on the top plate 820 along the first direction X are respectively located on both sides of the orthographic projection of the first partition plate 310 on the top plate 820. In other words, in the third direction Z, the first exhaust fan 410 and the second exhaust fan 420 are located on both sides of the first partition plate 310.

[0147] See also Fig.10 In a possible implementation, the first partition plate 310 includes a first side edge 311, and the first side edge 311 is rotatably connected to the first air outlet surface 130. The first side edge 311 is rotatably connected to the first air outlet surface 130, so that the first side edge 311 can rotate relative to the first air outlet surface 130. When the first air outlet surface 130 or the components in the exhaust space 200 need to be repaired, the first partition plate 310 can be rotated and folded for easy maintenance or cleaning.

[0148] like Fig.10 As shown, in one embodiment, the first side edge 311 and the first air outlet surface 130 are rotatably connected via a hinge 301 .

[0149] In some embodiments, the first side edge 311 is connected to the first air outlet surface 130 via a detachable structure for easy maintenance. When maintenance is required, the first side edge 311 is separated from the first air outlet surface 130 .

[0150] In a possible implementation, the first partition plate 310 includes a first sub-plate 312 and a second sub-plate 313 that are rotatably connected, and a side of the first sub-plate 312 away from the second sub-plate 313 is adjacent to the top plate 820. Figure 8 and Fig.10 The first sub-plate 312 and the second sub-plate 313 are arranged along the first direction X, and the first sub-plate 312 and the second sub-plate 313 are rotatably connected. When maintenance is required, the first sub-plate 312 is rotated so that the side of the first sub-plate 312 away from the second sub-plate 313 is adjacent to the bottom of the exhaust space 200, and the first sub-plate 312 and the second sub-plate 313 are folded.

[0151] like Fig.10 As shown, in one embodiment, the first sub-plate 312 and the second sub-plate 313 may be rotatably connected via a hinge 302 .

[0152] In some embodiments, the first sub-board 312 and the second sub-board 313 may be connected via a detachable structure for easy maintenance. When maintenance is required, the first sub-board 312 and the second sub-board 313 are separated.

[0153] Fig.10 The first partition plate 310 is triangular, the cross section of the exhaust space 200 is triangular, and the shape of the exhaust space 200 matches the first partition plate 310, so that the first partition plate 310 divides the exhaust space 200 into a first exhaust cavity 210 and a second exhaust cavity 220, and the airflow in the first exhaust cavity 210 and the second exhaust cavity 220 does not flow to each other. The first sub-plate 312 is trapezoidal, and the second sub-plate 313 is triangular.

[0154] Please combine Figure 4 and Fig.11 In one embodiment, the bottom of the exhaust space 200 has a first connecting plate 802 (such as Figure 4 As shown in FIG. 1 , the first connecting plate 802 is connected between the heat exchange core 100 and the first side plate 810, and the second sub-plate 313 is adjacent to the first connecting plate 802 on one side away from the first sub-plate 312. The second sub-plate 313 is a trapezoid (as shown in FIG. 1 ). Fig.11 As shown in the figure, since the exhaust space 200 is wide at the top and narrow at the bottom, the first partition plate 310 has a shape matching the exhaust space 200 and is also wide at the top and narrow at the bottom.

[0155] Please combine Figure 4 and Fig.12In one embodiment, the exhaust space 200 has a second connecting plate 809 (such as Figure 4 As shown), the second connecting plate 809 is connected between the heat exchange core 100 and the top plate 820. At this time, the shape of the first sub-plate 312 in the first partition plate 310 is a pentagon (as shown in FIG. Fig.12 As shown), the first partition plate 310 is adapted to the exhaust space 200.

[0156] The shape of the first partition 310 is not limited to Fig.10 , Fig.11 and Fig.12 As shown in the shape, in order to be able to separate the exhaust space 200 into the first exhaust cavity 210 and the second exhaust cavity 220, the size of each side of the first partition plate 310 needs to be compatible with the installation size of the exhaust space 200, and the specific size of the first partition plate 310 can be set according to the exhaust space 200 so that the airflow in the first exhaust cavity 210 and the second exhaust cavity 220 will not flow to each other.

[0157] Please continue reading Figure 2 In a possible implementation, the indirect evaporative cooling unit 10 further includes a first accommodation portion 870 , which is located on a side of the top plate 820 away from the heat exchange core 100 , and the first exhaust fan 410 and the second exhaust fan 420 are located in the first accommodation portion 870 .

[0158] The first receiving portion 870 is used to provide an air duct receiving space for the first exhaust fan 410 and the second exhaust fan 420, so that the discharged outdoor hot air H2 can be temporarily received in the first receiving portion 870. When the second exhaust fan 420 is reversed, the received outdoor hot air H2 can be sent back to the heat exchange core 100 through the second exhaust fan 420 to melt the ice of the heat exchange core 100. The first receiving portion 870 can improve the ice melting effect. When the first exhaust fan 410 is reversed, the received outdoor hot air H2 can be sent back to the heat exchange core 100 through the first exhaust fan 410 to melt the ice of the heat exchange core 100. In one embodiment, the first receiving portion 870 can be a closed cavity. When the first exhaust fan 410 or the second exhaust fan 420 is reversed, more outdoor hot air H2 can be sent to the heat exchange core 100 to melt the ice of the heat exchange core 100, thereby improving the ice melting efficiency. In one embodiment, the first receiving portion 870 may also be a cavity communicating with the external space.

[0159] The following describes the ice-melting process of the indirect evaporative cooling unit 10 in this embodiment, which includes two ways of ice-melting. The first way is: the exhaust fan is not running in the non-exhaust state, and the second way is: the exhaust fan is reversed in the non-exhaust state.

[0160] Please combine Figure 3 , Figure 5 and Figure 8 In one embodiment, the first method is used to melt ice. When the outdoor temperature is low, the indirect evaporative cooling unit 10 starts the antifreeze mode to melt ice on the heat exchange core 100, and the controller 500 controls the first exhaust fan 410 to operate normally (such as Figure 5 As shown), the second exhaust fan 420 does not operate, and the first exhaust fan 410 drives the outdoor cold air C2 located on the side of the first air inlet surface 140 to enter the outdoor air duct 110 in the heat exchange core 100 from the first air inlet surface 140. The outdoor air duct 110 includes a first outdoor sub-air duct 111 and a second outdoor sub-air duct 112 (as shown in FIG. Figure 3 As shown in the figure, since the second exhaust fan 420 is not running, the outdoor cold air C2 only enters the first outdoor sub-air duct 111 through the first air inlet surface 140, and there is no outdoor cold air C2 in the second outdoor sub-air duct 112. The outdoor cold air C2 in the first outdoor sub-air duct 111 is used to cool down the indoor hot air H1 in the indoor air duct 120, so as to ensure the cooling function of the indirect evaporative cooling unit 10 on the data center 1. Since there is no outdoor cold air C2 in the second outdoor sub-air duct 112, there is indoor hot air H1 in the indoor air duct 120 adjacent to the second outdoor sub-air duct 112. The indoor hot air H1 heats the second outdoor sub-air duct 112, and then melts the ice in the second outdoor sub-air duct 112. At the same time, the indoor hot air H1 can also heat up the indoor air duct 120 and melt the ice. Figure 5 The area Q shown by the dotted line box is the ice melting area.

[0161] Please combine Figure 6 and Figure 7 When the second outdoor sub-air duct 112 is defrosted, the controller 500 controls the first exhaust fan 410 not to operate, and the second exhaust fan 420 operates normally. The second exhaust fan 420 drives the outdoor cold air C2 located on the side of the first air inlet surface 140 to enter the outdoor air duct 110 in the heat exchange core 100 from the first air inlet surface 140. Since the first exhaust fan 410 is not operating, the outdoor cold air C2 only enters the second outdoor sub-air duct 112 through the first air inlet surface 140 (such as Figure 7 As shown in FIG. 1 , there is no outdoor cold air C2 in the first outdoor sub-air duct 111, and the outdoor cold air C2 in the second outdoor sub-air duct 112 is used to cool the indoor hot air H1 in the indoor air duct 120, so as to ensure the cooling function of the indirect evaporative cooling unit 10 on the data center 1. Since there is no outdoor cold air C2 in the first outdoor sub-air duct 111, there is indoor hot air H1 in the indoor air duct 120 adjacent to the first outdoor sub-air duct 111. The indoor hot air H1 heats the first outdoor sub-air duct 111, and then melts the ice in the first outdoor sub-air duct 111. At the same time, the indoor hot air H1 can also heat the indoor air duct 120 and melt the ice. Figure 6The area P shown in the dotted box is the deicing area. When the first outdoor sub-duct 111 and the second outdoor sub-duct 112 are deiced, the heat exchange core 100 is deiced, and the indirect evaporative cooling unit 10 can operate in the normal operating mode, that is, the first exhaust fan 410 and the second exhaust fan 420 are both in the exhaust state.

[0162] See also Fig.13 and Fig.14 In one embodiment, the second method is used to melt ice. When the outdoor temperature is low, the indirect evaporative cooling unit 10 starts the antifreeze mode to melt the ice on the heat exchange core 100. The controller 500 controls the first exhaust fan 410 to operate normally, and the second exhaust fan 420 is reversed, that is, the second exhaust fan 420 and the first exhaust fan 410 rotate in opposite directions. The first exhaust fan 410 drives the outdoor cold air C2 located on the side of the first air inlet surface 140 to enter the outdoor air duct 110 in the heat exchange core 100 from the first air inlet surface 140. The outdoor cold air C2 in the first outdoor sub-air duct 111 is used to cool the indoor hot air H1 in the indoor air duct 120 to ensure the cooling function of the indirect evaporative cooling unit 10 for the data center 1. The outdoor cold air C2 is heated by the heat exchange core 100 and becomes outdoor hot and cold H2, enters the first exhaust cavity 210, and is discharged from the first exhaust cavity 210 through the first exhaust fan 410. Due to the reversal of the second exhaust fan 420, the second exhaust fan 420 drives at least a portion H3 of the outdoor hot air H2 coming out of the first exhaust chamber 210 to enter the second outdoor sub-duct 112 to defrost the second outdoor sub-duct 112. In addition, the outdoor cold air C2 only enters the first outdoor sub-duct 111 through the first air inlet surface 140, and there is no outdoor cold air C2 in the second outdoor sub-duct 112. That is to say, both the indoor hot air H1 and the outdoor hot air H2 heat the second outdoor sub-duct 112 to improve the de-icing efficiency of the second outdoor sub-duct 112. The indoor hot air H1 also heats the indoor air duct 120 to defrost, so as to improve the de-icing efficiency of the heat exchange core 100 as a whole.

[0163] See also Fig.15 and Fig.16When the second outdoor sub-air duct 112 has finished defrosting, the controller 500 controls the first exhaust fan 410 to reverse, and the second exhaust fan 420 to operate normally. The second exhaust fan 420 drives the outdoor cold air C2 located on the side of the first air inlet surface 140 to enter the outdoor air duct 110 in the heat exchange core 100 from the first air inlet surface 140. Since the first exhaust fan 410 is reversed, the outdoor cold air C2 only enters the second outdoor sub-air duct 112 through the first air inlet surface 140. There is no outdoor cold air C2 in the first outdoor sub-air duct 111. The outdoor cold air C2 in the second outdoor sub-air duct 112 is used to cool the indoor hot air H1 in the indoor air duct 120, so as to ensure the cooling function of the indirect evaporative cooling unit 10 on the data center 1. The outdoor cold air C2 in the second outdoor sub-air duct 112 is changed into outdoor hot air H2 and discharged from the second air exhaust chamber 220. The first exhaust fan 410 is reversed to drive at least a portion H4 of the outdoor hot air H2 into the first outdoor sub-air duct 111 to melt ice in the first outdoor sub-air duct 111. In addition, since there is no outdoor cold air C2 in the first outdoor sub-air duct 111, the indoor air duct 120 adjacent to the first outdoor sub-air duct 111 has indoor hot air H1. Both the indoor hot air H1 and the outdoor hot air H2 heat the first outdoor sub-air duct 111 to improve the ice melting efficiency of the first outdoor sub-air duct 111. The indoor hot air H1 also heats the indoor air duct 120 to improve the ice melting efficiency of the heat exchange core 100 as a whole. When the first outdoor sub-duct 111 and the second outdoor sub-duct 112 are completely defrosted, the heat exchange core 100 is completely defrosted. At this time, the indirect evaporative cooling unit 10 can operate in the normal operating mode, that is, the first exhaust fan 410 and the second exhaust fan 420 are both in the exhaust state.

[0164] Please refer to Fig.17 and Fig.18 In a possible implementation, the indirect evaporative cooling unit 10 also includes a third exhaust fan 430, a third exhaust chamber 230 and a second partition 320. The third exhaust chamber 230 is connected to the air outlet of the outdoor air duct 110. The third exhaust fan 430 is located on the side of the third exhaust chamber 230 away from the air outlet of the outdoor air duct 110. The second partition 320 is located between the second exhaust chamber 220 and the third exhaust chamber 230 to separate the second exhaust chamber 220 and the third exhaust chamber 230. The controller 500 is also used to control the third exhaust fan 430 to be in the first state or the second state according to the temperature.

[0165] The first partition 310 and the second partition 320 divide the exhaust space 200 into a first exhaust chamber 210, a second exhaust chamber 220 and a third exhaust chamber 230. When the temperature is low, the controller 500 controls one or two of the first exhaust fan 410, the second exhaust fan 420 or the third exhaust fan 430 to a non-exhaust state to defrost the heat exchange core 100, so that the indirect evaporative cooling unit 10 has more ways to defrost when the temperature is extremely low, and the defrosting methods are more flexible. For example, in one embodiment, when the temperature is low, the controller 500 first controls the first exhaust fan 410 to be in an exhaust state, and controls the second exhaust fan 420 and the third exhaust fan 430 to be in a non-exhaust state. At this time, there is no outdoor cold air C2 in the outdoor air duct 110 corresponding to the second exhaust chamber 220 and the third exhaust chamber 230, and this part of the outdoor air duct 110 will melt when not cooled by the cold air. When the ice in this part of the outdoor air duct 110 and the indoor air duct 120 adjacent to this part of the outdoor air duct 110 is completely melted, the controller 500 controls the first exhaust fan 410 to be in a non-exhaust state, and controls the second exhaust fan 420 and the third exhaust fan 430 to be in a non-exhaust state. At this time, there is no outdoor cold air C2 in the outdoor air duct 110 corresponding to the first exhaust chamber 210, and this part of the outdoor air duct 110 will melt when not cooled by the cold air. After one cycle, the ice in the heat exchange core 100 is completely melted.

[0166] like Fig.18 As shown, the outdoor air duct 110 also includes a third outdoor sub-air duct 113, and the air outlet of the third outdoor sub-air duct 113 is connected to the third exhaust chamber 230. The first air outlet surface 130 also includes a third area 133. The third area 133 is located on the side of the second area 132 away from the first area 131. The second area 132 and the third area 133 are separated by a second partition plate 320. The second partition plate 320 is adjacent to the side of the first air outlet surface 130 and is located at the connection between the second area 132 and the third area 133.

[0167] In one embodiment, the structure of the second separator 320 is the same as that of the first separator 310. Fig.10 , Fig.11 and Fig.12 To understand the structure of the second partition 320, the aforementioned description of various possible implementations of the first partition 310 is also applicable to the description of the second partition 320, which will not be repeated here.

[0168] In other embodiments, the indirect evaporative cooling unit 10 may also include three or more partitions, which divide the exhaust space 200 into more exhaust cavities, and an exhaust fan is arranged at the air outlet of each exhaust cavity. When the temperature is low, the controller 500 can control some exhaust fans to be in exhaust state and some exhaust fans to be in non-exhaust state according to actual needs to defrost the heat exchange core 100.

[0169] Please combine Fig.19 and Fig. 20 , Fig.19 1 is a structural schematic diagram of an indirect evaporative cooling unit 10 provided in another embodiment of the present application. Fig. 20 yes Fig.19 The side view of the intermediate indirect evaporative cooling unit 10. In this embodiment, the structure and position relationship of the shell 800, the heat exchange core 100, the first exhaust cavity 210, and the second exhaust cavity 220 in the indirect evaporative cooling unit 10 are similar to those in the embodiment of the present invention. Figure 2 The embodiments shown are different. Fig.19 As shown, the indirect evaporative cooling unit 10 includes a shell 800, a heat exchange core 100 is located in the shell 800, the shell 800 includes a top plate 820, the shell 800 also includes a first sealing plate 803 and a second sealing plate 804, the heat exchange core 100 includes a first air outlet surface 130 connected to the outdoor air duct 110, the first air outlet surface 130 and the top plate 820 are arranged opposite to each other along the first direction X, the first sealing plate 803 and the second sealing plate 804 are located at both ends of the first air outlet surface 130 along the second direction Y, the first sealing plate 803, the first air outlet surface 130, the second sealing plate 804 and the top plate 820 are surrounded to form an exhaust space 200, the first partition plate 310 is located in the exhaust space 200 and divides the exhaust space 200 into a first exhaust cavity 210 and a second exhaust cavity 220, and the first direction X and the second direction Y intersect. In this embodiment, the first air outlet surface 130 is parallel to the top plate 820. The cross section of the heat exchange core 100 is rectangular or square.

[0170] In this embodiment, the housing 800 includes a top plate 820 and a bottom plate 860 disposed opposite to each other along a first direction X, and includes a first side plate 810 and a second side plate 830 disposed opposite to each other along a second direction Y. The first direction X is the height direction of the indirect evaporative cooling unit 10, and the second direction Y is the width direction of the indirect evaporative cooling unit 10.

[0171] In this embodiment, the heat exchange core 100 includes a first air outlet surface 130 and a first air inlet surface 140 which are relatively arranged along a first direction X, and the first air outlet surface 130 is located above the first air inlet surface 140. The heat exchange core 100 also includes a second air inlet surface 150 and a second air outlet surface 160 which are relatively arranged along a second direction Y, and the second air inlet surface 150 is adjacent to the first side plate 810, and the second air outlet surface 160 is adjacent to the second side plate 830.

[0172] See also Fig. 20The shell 800 also includes a third sealing plate 805, which is located between the first side plate 810 and the second air inlet surface 150, and compared with the first air outlet surface 130, the third sealing plate 805 is closer to the first air inlet surface 140, and the top plate 820, the first side plate 810, the third sealing plate 805, the second air inlet surface 150 and the first sealing plate 803 are connected in sequence and together enclose a second air inlet space 930.

[0173] The shell 800 also includes a fourth sealing plate 806 and a fifth sealing plate 807. The fifth sealing plate 807 is located between the first air inlet surface 140 and the bottom plate 860. The fourth sealing plate 806 and the first side plate 810 are arranged opposite to each other along the second direction Y. The fourth sealing plate 806 is located between the first air inlet surface 140 and the fifth sealing plate 807. Compared with the second air inlet surface 150, the fourth sealing plate 806 is arranged closer to the second air outlet surface 160. The first side plate 810, the first air inlet surface 140, the fourth sealing plate 806 and the fifth sealing plate 807 surround a first air inlet space 910. The top plate 820, the second sealing plate 804, the second air outlet surface 160, the fourth sealing plate 806, the fifth sealing plate 807, and the second side plate 830 are arranged to form an air supply space 920. The air supply fan 600 is located in the air supply space 920 or at the air outlet of the air supply space 920. In the present embodiment, the air supply fan 600 is located at the air outlet of the air supply space 920. The air supply space 920 is connected to the first air supply duct 13.

[0174] In a possible implementation, the first air outlet surface 130 and the first air inlet surface 140 of the heat exchange core 100 are parallel to the top plate 820, the second air inlet surface 150 and the second air outlet surface 160 are parallel to the first side plate 810, the extension direction of the outdoor air duct 110 is substantially parallel to the first direction X, and the extension direction of the indoor air duct 120 is substantially parallel to the second direction Y. The parallel structure of the surface of the heat exchange core 100 and the surface of the shell 800 makes the indirect evaporative cooling unit 10 more convenient to install and maintain.

[0175] In a possible implementation, the shell 800 further includes a second accommodation portion 880 , which is located on a side of the top plate 820 away from the heat exchange core 100 , and the first exhaust fan 410 and the second exhaust fan 420 are located in the second accommodation portion 880 .

[0176] The second receiving portion 880 is used to provide an air duct receiving space for the first exhaust fan 410 and the second exhaust fan 420, so that the discharged outdoor hot air H2 can be temporarily received in the second receiving portion 880. When the second exhaust fan 420 is reversed, the received outdoor hot air H2 can be sent back to the heat exchange core 100 through the second exhaust fan 420 to melt the ice of the heat exchange core 100. The second receiving portion 880 can improve the ice melting effect. When the first exhaust fan 410 is reversed, the received outdoor hot air H2 can be sent back to the heat exchange core 100 through the first exhaust fan 410 to melt the ice of the heat exchange core 100.

[0177] In one embodiment, the second receiving portion 880 may be a closed cavity. When the second exhaust fan 420 is reversed, more outdoor hot air H2 can be sent to the heat exchange core 100 again through the second exhaust fan 420 to melt the ice of the heat exchange core 100, thereby improving the ice melting efficiency. In one embodiment, the second receiving portion 880 may also be a cavity connected to the external space. The shape and size of the second receiving portion 880 may be set as required.

[0178] See also Fig.21 , Fig.21 Schematic diagram of the structure of the first baffle 310 in an embodiment. In a possible implementation, the first baffle 310 includes a third sub-plate 314 and a fourth sub-plate 315 arranged along the second direction Y, and the third sub-plate 314 and the fourth sub-plate 315 are rotatably connected. The third sub-plate 314 is rotatably connected to the fourth sub-plate 315, so that the third sub-plate 314 can be rotated relative to the fourth sub-plate 315, so that when the first air outlet surface 130 or the components in the exhaust space 200 need to be repaired, the first baffle 310 can be rotated and folded for easy repair or cleaning. The size of the first baffle 310 can be set according to the size and shape of the exhaust space 200.

[0179] In one embodiment, the third sub-plate 314 and the fourth sub-plate 315 are rotatably connected via a hinge 303 .

[0180] In some embodiments, the third sub-board 314 and the fourth sub-board 315 are connected via a detachable structure for easy maintenance. When maintenance is required, the third sub-board 314 and the fourth sub-board 315 are separated.

[0181] Fig.19 and Fig. 20 The indirect evaporative cooling unit 10 in the embodiment shown also includes two ways of melting ice. The first way is: the exhaust fan is not running in the non-exhaust state, and the second way is: the exhaust fan is reversed in the non-exhaust state. In the first way, the schematic diagram of the indirect evaporative cooling unit 10 when melting ice is as shown in FIG. Fig. 22 and Fig.23 As shown, the specific ice process principle is the same as the previous Figure 5 and Figure 6 The deicing process of the indirect evaporative cooling unit 10 in the illustrated embodiment is the same and will not be described in detail here. Please refer to the previous text for understanding. In the second method, the schematic diagram of the deicing of the indirect evaporative cooling unit 10 is as follows: Fig.24 and Fig.25 As shown, the specific ice process principle is the same as the previous Fig.13 and Fig.15 The de-icing process of the indirect evaporative cooling unit 10 in the illustrated embodiment is the same and will not be described in detail here. Please refer to the above text for understanding.

[0182] See also Figure 2 and Fig.26 In one embodiment of the present application, there is also provided an antifreeze control method, which is applied to the indirect evaporative cooling unit 10 of the above embodiment, and the antifreeze control method includes step S10, step S20 and step S30. The detailed steps are as follows.

[0183] Step S10, obtaining the temperature, wherein the temperature may be the outdoor temperature or the temperature of the wall of the heat exchange core 100 .

[0184] Step S20, when the temperature is less than the first preset temperature, the indirect evaporative cooling unit 10 is controlled to the antifreeze mode. The value of the first preset temperature can be determined according to the degree of ice formation of the heat exchange core 100 in the indirect evaporative cooling unit 10 or the refrigeration efficiency of the indirect evaporative cooling unit 10. For example, the first preset temperature is 0°C, and when the temperature is -5°C, the indirect evaporative cooling unit 10 is controlled to the antifreeze mode.

[0185] Step S30, when the temperature is greater than the second preset temperature, the indirect evaporative cooling unit 10 switches to the normal operating mode; the second preset temperature is greater than the first preset temperature. The difference between the second preset temperature and the first preset temperature can be set according to actual needs. In one embodiment, the difference between the value of the second preset temperature and the value of the first preset temperature is 2°C. In one embodiment, when the temperature is greater than the second preset temperature, and the temperature is maintained greater than the second preset temperature for a time greater than the preset maintenance time, the indirect evaporative cooling unit 10 switches to the normal operating mode. That is to say, the temperature is maintained for a certain period of time after the temperature rises and then switched to the normal operating mode. For example, the second preset temperature is 2°C, and the preset maintenance time is 5 hours. When the temperature is 5°C, and it is maintained at 5°C for 5 hours, the indirect evaporative cooling unit 10 switches to the normal operating mode. The preset maintenance time can be set according to actual needs and is not limited to 5 hours.

[0186] See also Fig. 27 The control process of the antifreeze mode includes step S21 and step S22. The detailed steps are as follows.

[0187] Step S21, control the first exhaust fan 410 to be in exhaust state, the second exhaust fan 420 to be in non-exhaust state, and the first exhaust fan 410 and the second exhaust fan 420 to run for a first preset time. The non-exhaust state includes the second exhaust fan 420 not running or reversing. In this step, the outdoor air duct 110 portion corresponding to the second exhaust fan 420 and the indoor air duct 120 are defrosted, and the specific defrosting process can be referred to above.

[0188] Step S22, control the first exhaust fan 410 to switch from the exhaust state to the non-exhaust state, and the second exhaust fan 420 to switch from the non-exhaust state to the exhaust state, and the first exhaust fan and the second exhaust fan are operated for a second preset time. In this step, the outdoor air duct 110 portion corresponding to the first exhaust fan 410 and the indoor air duct 120 are defrosted, and the specific defrosting process can be referred to above.

[0189] The first preset time and the second preset time can be the same or different, and can be set according to actual needs. The lower the temperature, the larger the value of the first preset time and the second preset time, so as to improve the antifreeze effect of the indirect evaporative cooling unit 10.

[0190] After step S21 and step S22 are completed, the indirect evaporative cooling unit 10 completes ice thawing to achieve an antifreeze effect at a relatively low temperature.

[0191] In the normal operation mode, the first exhaust fan 410 and the second exhaust fan 420 are controlled to be in exhaust state. When the indirect evaporative cooling unit 10 has finished defrosting, it operates normally to cool the data center 1.

[0192] The antifreeze control method of the present application controls the indirect evaporative cooling unit 10 to a prevention and control mode according to the temperature, and controls the first exhaust fan 410 or the second exhaust fan 420 to a non-exhaust state, so as to melt ice while ensuring the refrigeration demand of the indirect evaporative cooling unit 10, thereby improving the refrigeration efficiency of the indirect evaporative cooling unit 10 and preventing the heat exchange core 100 from freezing and cracking.

[0193] In a possible implementation, in the antifreeze mode, the rotation speeds of the first exhaust fan 410 and the second exhaust fan 420 when they are in the exhaust state are the first rotation speed, and in the normal operation mode, the rotation speeds of the first exhaust fan 410 and the second exhaust fan 420 when they are in the exhaust state are the second rotation speed, and the first rotation speed is greater than the second rotation speed. In the antifreeze mode, the rotation speed of the first exhaust fan 410 refers to the rotation speed of the first exhaust fan 410 when it is in the exhaust state in step S21, and the rotation speed of the second exhaust fan 420 refers to the rotation speed of the second exhaust fan 420 when it is in the exhaust state in step S22. Generally, for ease of control, the rotation speeds of the first exhaust fan 410 and the second exhaust fan 420 are the same, that is, both are the first rotation speed. In this embodiment, compared with the normal operation mode, the first exhaust fan 410 and the second exhaust fan 420 simultaneously operate the cooling function. In the antifreeze mode, the efficiency of the first exhaust fan 410 or the second exhaust fan 420 operating the cooling function is reduced, and even the cooling efficiency is halved. In order to ensure the cooling efficiency of the indirect evaporative cooling unit 10, the first speed is controlled to be greater than the second speed to improve the cooling efficiency of the indirect evaporative cooling unit 10. In some embodiments, in the antifreeze mode, the speeds of the first exhaust fan 410 and the second exhaust fan 420 in the exhaust state may also be different, but it is required that the speeds of the first exhaust fan 410 and the second exhaust fan 420 are greater than the second speed to ensure the cooling efficiency of the indirect evaporative cooling unit 10.

[0194] In a possible implementation, when the number of the first exhaust fan 410 and the second exhaust fan 420 is the same, the first speed is greater than or equal to twice the second speed. That is, the exhaust fan is divided into two parts by the first partition 310, one part is recorded as the first exhaust fan 410, and the other part is the second exhaust fan 420. In the antifreeze mode, the first exhaust fan 410 is in the exhaust state, and the second exhaust fan 420 is in the non-exhaust state. The first exhaust fan 410 is used for refrigeration, and the second exhaust fan 420 cannot be used for refrigeration. In order to ensure the refrigeration efficiency of the indirect evaporative cooling unit 10, the first speed is controlled to be greater than or equal to twice the second speed, so as to ensure that the refrigeration efficiency of the indirect evaporative cooling unit 10 in the antifreeze mode is similar to that in the normal operation mode. In some embodiments, when the number of the first exhaust fan 410 and the second exhaust fan 420 is different, the multiple of the first speed and the second speed can be set according to actual needs to ensure the refrigeration efficiency.

[0195] In a possible implementation, the antifreeze mode further includes controlling the value of the first speed according to the temperature. When entering the antifreeze mode, the temperature is different from the temperature in the normal operation mode. For example, the outdoor temperature in the antifreeze mode is lower than the outdoor temperature in the normal operation mode. At this time, the controller 500 needs to adjust the first speed according to the outdoor temperature to ensure the refrigeration efficiency of the indirect evaporative cooling unit 10 in the antifreeze mode.

[0196] In a possible implementation, when the temperature is greater than the second preset temperature, in the normal operation mode, the controller 500 is further used to control the value of the second speed according to the temperature. That is, in the normal operation mode, the second speed needs to be adjusted according to the temperature to save energy while meeting the cooling demand.

[0197] In a possible implementation, when the temperature is lower than the first preset temperature, the indirect evaporative cooling unit 10 controls the antifreeze mode to run multiple times, and when the temperature is greater than or equal to the third preset temperature and lower than the first preset temperature, the interval between two adjacent antifreeze modes is the first time period, and the third preset temperature is lower than the first preset temperature; when the temperature is lower than the third preset temperature, the interval between two adjacent antifreeze modes is the second time period, and the second time period is lower than the first time period. That is, the lower the temperature, the shorter the interval between the antifreeze mode runs, so as to improve the antifreeze effect.

[0198] The term "multiple times" refers to two or more times. For example, in one embodiment, the antifreeze mode is run twice, that is, the above steps S21 and S22 are controlled to run twice to improve the ice melting effect. When the antifreeze mode is run multiple times, between two adjacent antifreeze modes, the indirect evaporative cooling unit 10 is controlled to the normal operation mode.

[0199] For example, in one embodiment, when the third preset temperature is -10°C and the first preset temperature is 0°C, when the outdoor temperature is -8°C, the outdoor temperature is greater than or equal to the third preset temperature and less than the first preset temperature, the interval between two adjacent antifreeze modes is the first time period, and the first time period is set to 8 hours, that is, between two adjacent antifreeze modes, normal operation is performed for 8 hours, and the antifreeze mode is performed every 8 hours.

[0200] When the outdoor temperature is -15°C, the outdoor temperature is lower than the third preset temperature, and the interval between two adjacent antifreeze modes is the second time period, which is set to 4 hours, that is, between two adjacent antifreeze modes, normal operation is performed for 4 hours, and the antifreeze mode is performed every 4 hours. The lower the outdoor temperature, the shorter the interval, which improves the de-icing effect and prevents the heat exchange core 100 from freezing and affecting the cooling of the data center 1.

[0201] In a possible implementation, when the temperature is lower than a fourth preset temperature, the fourth preset temperature is lower than the third preset temperature, the interval between two adjacent antifreeze modes is a third time period, and the third time period is lower than the second time period.

[0202] For example, in one embodiment, when the fourth preset temperature is -20°C, the third preset temperature is -10°C, and when the outdoor temperature is -25°C, the outdoor temperature is lower than the fourth preset temperature, and the interval between two adjacent antifreeze modes is the third time period, and the third time period is set to 2 hours, that is, between two adjacent antifreeze modes, normal operation is performed for 2 hours, and the antifreeze mode is performed every 2 hours. In this way, the indirect evaporative cooling unit 10 can be de-iced when the temperature is lower, thereby ensuring the refrigeration effect of the indirect evaporative cooling unit 10.

[0203] In a possible implementation, in the antifreeze mode, the non-exhaust state is a reverse state, the speed of the first exhaust fan 410 or the second exhaust fan 420 when reversed is a third speed, the third speed is less than the first speed, and the direction of the first exhaust fan 410 in the reverse state is opposite to the direction of the first exhaust fan 410 in the normal operation mode. When the first exhaust fan 410 and the second exhaust fan 420 are in the reverse state, the outdoor hot air H2 is driven to enter the outdoor air duct 110 to improve the ice melting efficiency of the heat exchange core 100. When the first exhaust fan 410 and the second exhaust fan 420 are in normal operation, they are used to drive the outdoor hot air H2 to be discharged outward, when the first exhaust fan 410 and the second exhaust fan 420 are in normal operation, the rotation direction of the first exhaust fan 410 and the second exhaust fan 420 when reversed is counterclockwise; when the first exhaust fan 410 and the second exhaust fan 420 are in normal operation, the rotation direction of the first exhaust fan 410 and the second exhaust fan 420 when reversed is clockwise. The third speed is set to be lower than the first speed to prevent the first exhaust fan 410 or the second exhaust fan 420 from reversing to suck the outdoor cold air C2 into the outdoor air duct 110, thereby affecting the ice melting effect. For example, when the third speed is higher than the first speed, the first exhaust fan 410 or the second exhaust fan 420 will not only suck the outdoor hot air H2, but also suck the external outdoor cold air C2, thereby affecting the ice melting effect.

[0204] In a possible implementation, the third speed is 10-50% of the first speed. In one implementation, the third speed is 30% of the first speed. In other implementations, the third speed can be set according to actual needs.

[0205] See also Fig.17 and Fig.28 In a possible implementation, when the indirect evaporative cooling unit 10 includes the third exhaust fan 430, the control process of the antifreeze mode includes step S23, step S24 and step S25. The detailed steps are as follows.

[0206] Step S23, control the first exhaust fan 410 and the second exhaust fan 420 to be in exhaust state, the third exhaust fan 430 to be in non-exhaust state, and the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 to operate for a third preset time. The non-exhaust state includes the third exhaust fan 430 not operating or reversing. In this step, the outdoor air duct 110 portion corresponding to the third exhaust fan 430 and the indoor air duct 120 are defrosted.

[0207] Step S24, the first exhaust fan 410 and the third exhaust fan 430 are controlled to be in exhaust state, the second exhaust fan 420 is in non-exhaust state, and the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 are operated for a fourth preset time. In this step, the outdoor air duct 110 portion corresponding to the second exhaust fan 420 and the indoor air duct 120 are defrosted.

[0208] Step S25, the second exhaust fan 420 and the third exhaust fan 430 are controlled to be in exhaust state, the first exhaust fan 410 is in non-exhaust state, and the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 are operated for a fifth preset time. In this step, the outdoor air duct 110 portion corresponding to the first exhaust fan 410 and the indoor air duct 120 are defrosted.

[0209] When the indirect evaporative cooling unit 10 includes the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430, one of the three exhaust fans, the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430, is controlled to be in a non-exhaust state in sequence to partially defrost the corresponding outdoor air duct 110, so that the defrosting control is more accurate, and the two exhaust fans are kept in the exhaust state to ensure the refrigeration effect of the indirect evaporative cooling unit 10. The second preset time, the third preset time and the fifth preset time can be set according to actual needs.

[0210] In a possible implementation, in the antifreeze mode, the rotation speeds of the first exhaust fan 410, the second exhaust fan 420, and the third exhaust fan 430 when they are in the exhaust state are the fourth rotation speed, and in the normal operation mode, the rotation speeds of the first exhaust fan 410, the second exhaust fan 420, and the third exhaust fan 430 when they are in the exhaust state are the second rotation speed, and the fourth rotation speed is greater than the second rotation speed. In the antifreeze mode, the rotation speed of the first exhaust fan 410 refers to the rotation speed of the first exhaust fan 410 when it is in the exhaust state in step S23 and step S24, the rotation speed of the second exhaust fan 420 refers to the rotation speed of the second exhaust fan 420 when it is in the exhaust state in step S23 and step S25, and the rotation speed of the third exhaust fan 430 refers to the rotation speed of the third exhaust fan 430 when it is in the exhaust state in step S24 and step S25. In this embodiment, compared with the normal operating mode, the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 simultaneously operate the cooling function. In the antifreeze mode, the efficiency of the two normal operating cooling functions of the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 is reduced. In order to ensure the cooling efficiency of the indirect evaporative cooling unit 10, the fourth speed is controlled to be greater than the second speed, thereby improving the cooling efficiency of the indirect evaporative cooling unit 10.

[0211] In a possible implementation, when the number of the third row of fans 430 is the same as that of the first row of fans 410 and the second row of fans 420, the third rotational speed is greater than or equal to three times the second rotational speed.

[0212] See also Fig.29 In a possible implementation, when the indirect evaporative cooling unit 10 includes the third exhaust fan 430, the control process of the antifreeze mode includes step S26, step S27 and step S28. The detailed steps are as follows.

[0213] Step S26, the first exhaust fan 410 is controlled to be in exhaust state, the second exhaust fan 420 and the third exhaust fan 430 are controlled to be in non-exhaust state, and the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 are operated for a sixth preset time. In this step, the outdoor air duct 110 portion corresponding to the second exhaust fan 420 and the third exhaust fan 430 and the indoor air duct 120 are defrosted.

[0214] Step S27, the third exhaust fan 430 is controlled to be in exhaust state, the first exhaust fan 410 and the second exhaust fan 420 are controlled to be in non-exhaust state, and the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 are operated for a seventh preset time. In this step, the outdoor air duct 110 portion corresponding to the first exhaust fan 410 and the second exhaust fan 420 and the indoor air duct 120 are defrosted.

[0215] Step S28, the second exhaust fan 420 is controlled to be in exhaust state, the first exhaust fan 410 and the third exhaust fan 430 are controlled to be in non-exhaust state, and the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430 are operated for an eighth preset time. In this step, the outdoor air duct 110 portion corresponding to the first exhaust fan 410 and the third exhaust fan 430 and the indoor air duct 120 are defrosted.

[0216] When the indirect evaporative cooling unit 10 includes the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430, two of the three exhaust fans, the first exhaust fan 410, the second exhaust fan 420 and the third exhaust fan 430, are controlled to be in a non-exhaust state in sequence to partially defrost the corresponding outdoor air duct 110, so that defrosting control is more accurate, and keeping the two exhaust fans in a non-exhaust state can improve the defrosting efficiency of the indirect evaporative cooling unit 10. The sixth preset time, the seventh preset time and the eighth preset time can be set according to actual needs.

[0217] It should be understood that when the indirect evaporative cooling unit 10 includes three or more partitions to divide the exhaust space 200 into four or more exhaust chambers, the controller 500 can control the exhaust fan to a non-exhaust state in a logical order according to actual needs, not limited to Fig.28 and Fig.29 The control process shown.

[0218] It should be understood that the indirect evaporative cooling unit 10 in the present application can use any of the antifreeze control methods described above to perform ice thawing and antifreeze, and various implementable methods of the indirect evaporative cooling unit 10 can be applied to the antifreeze control method; or various implementable methods of the antifreeze control method in the present application can be applied to the indirect evaporative cooling unit 10 of the present application. The indirect evaporative cooling unit 10 of the present application can be applied not only to the data center 1 to dissipate heat and cool the data center 1, but also to other large places with more heat generation, such as production workshops.

[0219] It should be noted that the components in the indirect evaporative cooling unit 10 include but are not limited to the components described in this specification, and may also include more components to realize the refrigeration function of the indirect evaporative cooling unit 10, for example, also including an evaporator, a condenser, electrical connecting wires, etc.

[0220] The indirect evaporative cooling unit, data center and antifreeze control method provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An indirect evaporative cooling unit, characterized in that: include: A heat exchange core, comprising an outdoor air duct and a first air outlet surface, wherein the first air outlet surface is connected to the outdoor air duct, and the first air outlet surface comprises a first area and a second area; a first exhaust cavity and a second exhaust cavity, wherein the first region is in communication with the first exhaust cavity, and the second region is in communication with the second exhaust cavity; a first partition plate, separating the first exhaust cavity from the second exhaust cavity, and the first partition plate also separating the first area from the second area; The first exhaust fan and the second exhaust fan are respectively located at one side of the first exhaust cavity and the second exhaust cavity away from the outdoor air duct outlet; A controller is used to control the first exhaust fan to a first state and the second exhaust fan to a second state according to temperature, wherein the first state is one of an exhaust state and a non-exhaust state, and the second state is the other of the exhaust state and the non-exhaust state. The first exhaust fan is used to drive outdoor cold air to pass through the heat exchange core and then be discharged from the first area into the first exhaust cavity when the first exhaust fan is in the exhaust state, and the second exhaust fan is used to drive outdoor cold air to pass through the heat exchange core and then be discharged from the second area into the second exhaust cavity when the second exhaust fan is in the exhaust state.

2. The indirect evaporative cooling unit according to claim 1, characterized in that: The indirect evaporative cooling unit also includes a shell, the heat exchange core is located in the shell, the shell includes a first side plate and a top plate, the first side plate and the top plate intersect and are connected, the first air outlet surface intersects and is connected with both the first side plate and the top plate, the first air outlet surface, the first side plate and the top plate enclose an exhaust space, the first partition is located in the exhaust space and divides the exhaust space into the first exhaust cavity and the second exhaust cavity.

3. The indirect evaporative cooling unit according to claim 2, characterized in that: The first partition plate includes a first side edge, and the first side edge is rotatably connected to the first air outlet surface.

4. The indirect evaporative cooling unit according to claim 3, characterized in that: The first partition plate includes a first sub-plate and a second sub-plate that are rotatably connected, and a side of the first sub-plate away from the second sub-plate is adjacent to the top plate.

5. The indirect evaporative cooling unit according to claim 1, characterized in that: The indirect evaporative cooling unit also includes a shell, the heat exchange core is located in the shell, the shell includes a top plate, the shell also includes a first sealing plate and a second sealing plate, the first air outlet surface and the top plate are arranged opposite to each other along a first direction, the first sealing plate and the second sealing plate are located on both sides of the first air outlet surface along a second direction, the first sealing plate, the first air outlet surface, the second sealing plate and the top plate enclose an exhaust space, the first partition is located in the exhaust space and divides the exhaust space into the first exhaust cavity and the second exhaust cavity, and the first direction and the second direction intersect.

6. The indirect evaporative cooling unit according to claim 5, characterized in that: The first partition plate includes a third sub-plate and a fourth sub-plate arranged along the second direction, and the third sub-plate and the fourth sub-plate are rotatably connected.

7. The indirect evaporative cooling unit according to any one of claims 1 to 6, characterized in that: The indirect evaporative cooling unit further includes a third exhaust fan, a third exhaust chamber, and a second partition, wherein the third exhaust chamber is connected to the air outlet of the outdoor air duct, the third exhaust fan is located at a side of the third exhaust chamber away from the air outlet of the outdoor air duct, and the second partition is located between the second exhaust chamber and the third exhaust chamber to separate the second exhaust chamber and the third exhaust chamber; The controller is further used to control the third exhaust fan to be in the first state or the second state according to the temperature.

8. The indirect evaporative cooling unit according to any one of claims 2 to 4, characterized in that: The indirect evaporative cooling unit further comprises a first accommodation portion, which is located on a side of the top plate away from the heat exchange core, and the first exhaust fan and the second exhaust fan are located in the first accommodation portion.

9. The indirect evaporative cooling unit according to any one of claims 1 to 6, characterized in that: The temperature is the outdoor temperature or the temperature of the core wall of the heat exchange core.

10. An antifreeze control method, characterized in that: Applied to the indirect evaporative cooling unit according to any one of claims 1 to 9, the antifreeze control method comprises: Get the temperature; When the temperature is lower than a first preset temperature, the indirect evaporative cooling unit is controlled to an antifreeze mode; When the temperature is greater than a second preset temperature, the indirect evaporative cooling unit switches to a normal operating mode; the second preset temperature is greater than the first preset temperature; The control process of the antifreeze mode includes: Controlling the first exhaust fan to the exhaust state and the second exhaust fan to the non-exhaust state, and the first exhaust fan and the second exhaust fan to operate for a first preset time; Controlling the first exhaust fan to switch from the exhaust state to the non-exhaust state, controlling the second exhaust fan to switch from the non-exhaust state to the exhaust state, and the first exhaust fan and the second exhaust fan to operate for a second preset time; In the normal operating mode: The first exhaust fan and the second exhaust fan are controlled to be in exhaust state.

11. The antifreeze control method according to claim 10, characterized in that: In the antifreeze mode, the rotational speed of the first exhaust fan and the second exhaust fan when they are in the exhaust state is a first rotational speed. In the normal operating mode, the rotational speed of the first exhaust fan and the second exhaust fan when they are in the exhaust state is a second rotational speed, and the first rotational speed is greater than the second rotational speed.

12. The antifreeze control method according to claim 11, characterized in that: When the number of the first exhaust fans and the second exhaust fans is the same, the first rotational speed is greater than or equal to twice the second rotational speed.

13. The antifreeze control method according to claim 11, characterized in that: In the antifreeze mode, the non-exhaust state is a reverse state, the reverse speed of the first exhaust fan or the second exhaust fan is a third speed, the third speed is less than the first speed, and the direction of operation of the first exhaust fan in the reverse state is opposite to the direction of operation of the first exhaust fan in the normal operating mode.

14. The antifreeze control method according to claim 11, characterized in that: The antifreeze mode also includes controlling the value of the first rotation speed according to the temperature.

15. The antifreeze control method according to claim 10, characterized in that: When the temperature is lower than the first preset temperature, the indirect evaporative cooling unit controls to operate the antifreeze mode multiple times, and when the temperature is greater than or equal to a third preset temperature and lower than the first preset temperature, the interval between two adjacent antifreeze modes is a first time period, and the third preset temperature is lower than the first preset temperature; When the temperature is lower than the third preset temperature, the interval between two adjacent antifreeze modes is a second time period, and the second time period is lower than the first time period.

16. A data center, characterized in that: The data center includes a computer room, a server, and an indirect evaporative cooling unit according to any one of claims 1 to 9, wherein the server is located in the computer room, and the indirect evaporative cooling unit is used to dissipate heat from the server.

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