Heat exchange unit, control method and control device

Abstract

The invention discloses a heat exchange unit, a control method and a control device. The heat exchange unit comprises a rack; the two rows of heat exchange core bodies are arranged on the rack in parallel in the first direction, and the heat exchange core bodies are obliquely arranged, so that the outdoor air inlet faces and the outdoor air outlet faces of the heat exchange core bodies intersect with the first direction and the second direction, and the second direction is perpendicular to the first direction; the spraying system comprises two spraying devices corresponding to the heat exchange core bodies, and each spraying device comprises a first spraying set located on the outdoor air outlet side of the corresponding heat exchange core body and a second spraying set located on the outdoor air inlet side of the corresponding heat exchange core body; the multiple nozzles of the first spraying set are sequentially arranged in the direction parallel to the outdoor air outlet face, and the multiple nozzles of the second spraying set are sequentially arranged in the direction parallel to the outdoor air inlet face. The spraying mode and the spraying water amount of the spraying system can be adjusted according to different working conditions, so that the unit can better save energy and water under the conditions of different temperatures and humidity.

Description

Technical Field

[0001] The present application relates to the technical field of computer room air conditioning, and in particular to a heat exchange unit, a control method and a control device. Background Art

[0002] Indirect evaporative cooling units use the cooling effect of lower-temperature outdoor air and / or compressor mode to exchange heat with the air in the computer room, removing heat from the room.

[0003] In the process of implementing the present invention, the inventors discovered that the prior art has at least the following problems:

[0004] The existing spray system cannot effectively control the spraying mode and spraying water volume according to different working conditions. On the one hand, it will lead to high water consumption and waste of water resources; on the other hand, it will lead to poor wet film coverage of the heat exchange core during spraying, and the effective evaporation area of ​​the heat exchange core will be low, making the outdoor air outlet temperature of the heat exchange core high, which will lead to an increase in the condensation temperature on the outdoor air outlet side, requiring the air conditioning system to add more cooling capacity, resulting in a waste of electricity resources.

[0005] Therefore, in response to the above technical problems, how to effectively control the spray system is a technical problem that those skilled in the art need to solve. Summary of the Invention

[0006] The purpose of this application is to provide a heat exchange unit, a control method and a control device, which can adjust the spraying mode and spraying water volume of the spraying system according to different working conditions, so that the unit can better save energy and water under different temperature and humidity conditions.

[0007] To achieve the above objectives, the present application provides a heat exchange unit, comprising:

[0008] frame;

[0009] Two rows of heat exchange cores, the two rows of heat exchange cores are arranged side by side on the frame along a first direction, and the heat exchange cores are arranged obliquely so that the outdoor air inlet surface and the outdoor air outlet surface of the heat exchange cores intersect with both the first direction and the second direction, and the second direction is perpendicular to the first direction;

[0010] The spray system includes two spray devices respectively provided corresponding to each of the heat exchange cores, the spray devices including a first spray group located on the outdoor air outlet side of the corresponding heat exchange core and a second spray group located on the outdoor air inlet side of the corresponding heat exchange core;

[0011] The multiple nozzles of the first spray group are arranged in sequence along a direction parallel to the outdoor air outlet surface, and the multiple nozzles of the second spray group are arranged in sequence along a direction parallel to the outdoor air inlet surface.

[0012] Preferably, a mechanical refrigeration system is further included, and the mechanical refrigeration system includes:

[0013] A condenser is provided on the outdoor air outlet side, and the first spray group is provided between the condenser and the heat exchange core;

[0014] An evaporator is provided on the indoor air outlet side of the heat exchange core;

[0015] The compressor is connected to the condenser and the evaporator to form a refrigerant circulation loop of the mechanical refrigeration system.

[0016] Preferably, the spraying range of the first spray group at least covers the outdoor air outlet surface, and the spraying range of the second spray group at least covers the outdoor air inlet surface;

[0017] The spraying amount and / or arrangement density of each nozzle of the first spray group and / or the second spray group gradually increases in the direction from the indoor air outlet side to the indoor air return side of the corresponding heat exchange core.

[0018] Preferably, the spray system also includes a spray water tank, which is connected to the first spray group and the second spray group respectively through a spray water pipe. A spray water pump is provided on the spray water pipe, and the first spray group and the second spray group are respectively provided with solenoid valves on the branches of the spray water pipe corresponding to the spray water pipe.

[0019] A control method, applicable to the heat exchanger unit described above, comprising:

[0020] Acquire a preset first switching point temperature and a second switching point temperature, wherein the second switching point temperature is greater than the first switching point temperature;

[0021] If the current target outdoor dry-bulb temperature is lower than the first switching point temperature, shut down the sprinkler system and the mechanical refrigeration system;

[0022] If the target outdoor dry-bulb temperature is greater than the first switching point temperature, determining whether the current target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature, and if so, executing the next step;

[0023] If the target outdoor wet-bulb temperature is lower than the preset second switching point temperature, the temperature range of the target outdoor wet-bulb temperature is determined, and at least one of the second spray group and the first spray group of the spray system is controlled to be turned on according to the temperature range.

[0024] Preferably, controlling to open at least one of the second spray group and the first spray group of the spray system according to the temperature range includes:

[0025] If the target outdoor wet-bulb temperature is within a first preset temperature range in the temperature range, turning on the second spray group and turning off the first spray group;

[0026] If the target outdoor wet-bulb temperature is within a third preset temperature range within the temperature range, turning off the second spray group and turning on the first spray group;

[0027] If the target outdoor wet-bulb temperature is within a second preset temperature range within the temperature range, turning on the second spray group and turning on the first spray group;

[0028] The temperature range includes a first preset temperature range close to the first switching point temperature, a second preset temperature range close to the second switching point temperature, and a third preset temperature range between the first preset temperature range and the second preset temperature range.

[0029] Preferably, it also includes:

[0030] If the target outdoor wet-bulb temperature is greater than or equal to the second switching point temperature, turning on the mechanical refrigeration system;

[0031] At least one of the second spray group and the first spray group is turned on according to the condensing temperature of the mechanical refrigeration system.

[0032] Preferably, opening at least one of the second spray group and the first spray group according to the condensing temperature of the mechanical refrigeration system comprises:

[0033] If the target outdoor wet-bulb temperature is within a first preset condensing temperature range, turning on the second spray group and turning off the first spray group;

[0034] If the target outdoor wet-bulb temperature is within a second preset condensing temperature range, turning on the second spray group and the first spray group;

[0035] Wherein, the temperature value in the second preset condensing temperature range is greater than the temperature value in the first preset condensing temperature range.

[0036] A control device for a heat exchanger unit, the control device comprising:

[0037] Acquisition module: used to obtain the preset first switching point temperature and second switching point temperature;

[0038] A first control module; configured to shut down the sprinkler system and the mechanical refrigeration system when the current target outdoor dry-bulb temperature is less than the first switching point temperature;

[0039] A judgment module is configured to judge the difference between the target outdoor dry-bulb temperature and the first switching point temperature, and when the target outdoor dry-bulb temperature is greater than the first switching point temperature, further judge whether the current target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature; if so, judge whether the target outdoor wet-bulb temperature is less than a preset second switching point temperature, and the second switching point temperature is greater than the first switching point temperature;

[0040] Determining module: used for determining the temperature range of the target outdoor wet-bulb temperature when the target outdoor wet-bulb temperature is lower than the preset second switching point temperature;

[0041] The second control module is configured to control the opening of at least one of the second spray group and the first spray group of the spray system according to the temperature range.

[0042] A computer device comprises a processor and a memory, wherein the memory is used to store at least one section of program code, and the at least one section of program code is loaded by the processor and executes any one of the control methods described above.

[0043] A computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store at least one section of program code, and the at least one section of program code is used to execute any of the control methods described above.

[0044] Compared with the prior art, the technical solution provided by this application has at least the following beneficial effects:

[0045] The two rows of heat exchange cores of the present application are arranged side by side on the frame along the first direction, and the heat exchange cores are kept tilted so that the outdoor wind inlet surface and the outdoor wind outlet surface of the heat exchange core intersect with both the first direction and the second direction. The first direction can be a horizontal direction, and the second direction is perpendicular to the first direction, that is, the second direction is a vertical direction. The indoor wind and the outdoor wind can complete heat exchange in the corresponding inclined channels in the corresponding heat exchange cores. The spray system includes a spray device corresponding to each heat exchange core, the first spray group of the spray device is located on the outdoor wind outlet side, and the second spray group is located on the outdoor wind inlet side. The multiple nozzles of the first spray group are arranged in sequence along a direction parallel to the outdoor wind outlet surface, and the multiple nozzles of the second spray group are arranged in sequence along a direction parallel to the outdoor wind inlet surface, so that the first spray group and the second spray group spray into the outdoor wind channel in a manner adapted to the inclination of the heat exchange core, thereby improving the heat exchange efficiency of the heat exchange core.

[0046] The present application can also control the operation of the spray system according to the outdoor temperature and humidity conditions. Specifically, when the outdoor temperature rises, the heat exchange capacity of the heat exchange core itself decreases, so it is necessary to increase the heat exchange capacity of the heat exchange core through the spray system. At the same time, considering the impact of outdoor humidity on the evaporation efficiency of the spray water, at least one of the first spray group and the second spray group can be selectively turned on according to the size of the outdoor humidity, so as to avoid the waste of water resources caused by large spray water volume, and avoid the problem of low heat exchange efficiency caused by too little spray water, save water resources and electricity resources, and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0048] FIG1 is a schematic diagram of the structure of a heat exchanger unit provided in an embodiment of the present application.

[0049] In the figure: 1-spray water tank; 2-spray water pump; 3-spray water pipe; 4-lower solenoid valve; 5-upper solenoid valve; 6-first spray group; 7-second spray group; 8-condenser; 9-outdoor fan; 10-water collector; 11-heat exchange core; 12-evaporator; 13-indoor fan. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper," "lower," "front," and "back" are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0053] Please refer to Figure 1. In this embodiment, a heat exchange unit is provided, which includes a frame, a heat exchange core 11 and a spray system. Two rows of heat exchange cores 11 are arranged side by side on the frame along a first direction, and the heat exchange cores 11 are arranged tilted. The first direction can be a horizontal direction, that is, the two rows of heat exchange cores 11 are arranged side by side in the horizontal direction. The tilted heat exchange core 11 makes the outdoor wind inlet surface and the outdoor wind outlet surface of the heat exchange core 11 intersect with both the first direction and the second direction. The second direction is a vertical direction perpendicular to the first direction. It can be seen that the outdoor wind inlet surface and the outdoor wind outlet surface of the heat exchange core 11 of the present application are not parallel to the horizontal direction or the vertical direction, thereby forming an inclined heat exchange core 11 structure. In addition, on the basis of the inclined setting of the heat exchange core 11, the two heat exchange cores 11 can also be arranged symmetrically.

[0054] Within the heat exchange core 11, independent, angled outdoor and indoor air channels exist. The outdoor and indoor air flow through their respective channels, exchanging heat within them. This arrangement of the heat exchange core 11 ensures that the overall airflow paths of the outdoor and indoor air within their respective channels are essentially straight. With no resistance other than the heat exchange core 11 itself, wind resistance is effectively reduced.

[0055] The spray system includes two spray devices corresponding to each heat exchange core 11. These include a first spray group 6 located on the outdoor air outlet side of the corresponding heat exchange core 11, and a second spray group 7 located on the outdoor air inlet side of the corresponding heat exchange core 11. As can be seen, the first spray group 6 sprays from top to bottom. Given the tilted arrangement of the heat exchange core 11, the first spray group 6 sprays downwardly toward the outdoor air duct; similarly, the second spray group 7 sprays upwardly toward the indoor air duct.

[0056] The multiple nozzles of the first spray group 6 are arranged in sequence along a direction parallel to the outdoor air outlet surface, and the multiple nozzles of the second spray group 7 are arranged in sequence along a direction parallel to the outdoor air inlet surface. Since the heat exchange core 11 of the present application is tilted, after the spray water enters the outdoor air channel, it will fall onto the outer wall of the indoor air channel under the action of gravity, thereby improving the heat exchange efficiency between the indoor air and the outdoor air in the heat exchange core 11. At the same time, since the heat exchange core 11 is tilted, the channel wall of the indoor air channel will also be tilted accordingly. After the spray water contacts the channel wall of the indoor air channel, its tilted characteristics will be used to generate a certain resistance to the spray water, thereby preventing the spray water from flowing out of the outdoor air channel quickly without resistance in the opposite direction of gravity, resulting in the spray water not being fully utilized in the heat exchange core 11, thereby reducing the heat exchange efficiency of the heat exchange core 11.

[0057] Please refer to Figure 1. The heat exchange unit also includes a mechanical refrigeration system, which includes a condenser 8, an evaporator 12, and a compressor. The condenser 8 is located on the outdoor air outlet side, and the first spray group 6 is located between the condenser 8 and the heat exchange core 11; the evaporator 12 is located on the indoor air outlet side. Among them, the outdoor air outlet side is the side of the heat exchange core 11 that is inclined upward, and the indoor air outlet side is the side of the heat exchange core 11 that is inclined downward. The outdoor air outlet side is adjacent to the indoor air outlet side, and the corresponding outdoor air inlet side is adjacent to the indoor air return side. The compressor is connected to the condenser 8 and the evaporator 12 to form a refrigerant circulation loop of the mechanical refrigeration system. Of course, the mechanical refrigeration system also includes components such as an electronic expansion valve, which will not be repeated here.

[0058] On this basis, when the outdoor air enters the heat exchange core 11, it will exchange heat with the indoor return air in the heat exchange core 11. It should be noted that since there are independent outdoor air channels and outdoor air channels in the heat exchange core 11, the outdoor air enters the outdoor air channel from the outdoor air inlet side and is discharged from the outdoor air outlet side, and then passes through the condenser 8 for heat exchange (mechanical refrigeration mode), and is discharged to the outdoor environment through the outdoor fan 9; the indoor return air enters the indoor air channel from the indoor air return side, exchanges heat with the outdoor air in the heat exchange core 11, and is discharged from the indoor air supply side after heat exchange, and then is supplied to the indoor environment through the evaporator 12 and the indoor fan 13. Therefore, the indoor return air and the outdoor intake air will not mix when they are heat exchanged in the heat exchange core 11.

[0059] Among them, the first spray group 6 and the second spray group 7 are parallel to the outdoor wind outlet surface and the outdoor wind inlet surface of the heat exchange core 11 respectively, and one end of the first spray group 6 and the second spray group 7 are close to the indoor wind return side, and the other end is close to the indoor wind outlet side, so that the spraying range of the first spray group 6 at least covers the outdoor wind outlet surface, and the spraying range of the second spray group 7 at least covers the outdoor wind inlet surface, thereby ensuring that the spray water can be fully sprayed to the heat exchange core 11, avoiding the problem of poor local heat exchange efficiency due to local lack of spray water.

[0060] In addition, considering that the heat exchange temperature at different positions of the heat exchange core 11 is not uniform during the heat exchange process, it is necessary to make the spraying mode and spray flow rate at different positions on the first spray group 6 or the second spray group 7 different according to actual conditions; for example, the heat exchange core 11 is close to the indoor air return side. Since the indoor return air temperature is higher, the spray water volume can be increased at this position, thereby enhancing the heat exchange of the heat exchange core 11 in the area with a large temperature difference. Alternatively, the spray volume and / or arrangement density of each nozzle of the first spray group 6 and / or the second spray group 7 gradually increase in the direction from the indoor air outlet side to the indoor air return side of the corresponding heat exchange core 11, thereby meeting the heat exchange requirements of different positions of the heat exchange core 11.

[0061] The above points out that the spraying mode and flow rate at different positions in the first spray group 6 or the second spray group 7 may be different. For the first spray group 6 and the second spray group 7, the overall spraying mode and spray flow rate of the two may also be different. For example, the first spray group 6 and the second spray group 7 both include multiple nozzles, and the nozzles spray the heat exchange core 11 in a spraying or misting manner. Specifically, the upper and lower spraying, upper spraying and lower spraying, upper spraying and lower spraying, upper and lower spraying, etc. can be adopted. I will not go into details here and can choose according to actual conditions.

[0062] Please refer to Figure 1, the spray system also includes a spray water tank 1, which is connected to the first spray group 6 and the second spray group 7 respectively through a spray water pipe 3, and a spray water pump 2 is set on the spray water pipe 3 to provide spraying power; the branches corresponding to the first spray group 6 and the second spray group 7 are respectively provided with an upper solenoid valve 5 and a lower solenoid valve 4, which can be used to control the opening and closing of the first spray group 6 and the second spray group 7.

[0063] Taking into account that the spraying device will produce a certain amount of water splash when spraying, in order to prevent the water splash from entering the condenser 8, a water collector 10 can be added between the heat exchange core 11 and the condenser 8. The water collector 10 is provided with air holes for gas to pass through, ensuring that the gas discharged from the outdoor air outlet side can move toward the condenser 8.

[0064] In addition, since there are two heat exchange cores 11, the spray devices on the two heat exchange cores 11 can be symmetrically arranged, and at the same time, the first spray groups 6 on the two groups of spray devices are connected, and the second spray groups 7 on the two groups of spray devices are connected, thereby ensuring that the spraying method and spraying water volume of the two heat exchange cores 11 are roughly the same.

[0065] The present application also provides a control method applicable to the above-mentioned heat exchange unit, the control method comprising:

[0066] Obtain a preset first switching point temperature and a second switching point temperature, where the second switching point temperature is greater than the first switching point temperature. The first switching point temperature is the preset temperature for switching the unit to dry mode and can be between 0°C and 10°C. The second switching point temperature is the preset temperature for switching the unit to mixed mode and can be between 25°C and 30°C. The first and second switching point temperatures are set by technicians based on actual conditions, including but not limited to the temperature ranges given above. Multiple experiments can be conducted to determine the most accurate switching point temperatures.

[0067] If the current target outdoor dry-bulb temperature is lower than the first switching point, it indicates that the outdoor temperature is low and the heat exchange core 11 can meet the cooling demand through its own heat exchange. Therefore, the spray system and mechanical refrigeration system in the heat exchange unit can be turned off. The dry-bulb temperature is the temperature measured by a thermometer when it is freely exposed to the air, that is, the current outdoor temperature.

[0068] If the target outdoor dry-bulb temperature is greater than the first switching point temperature, it indicates that the outdoor temperature is high and the heat exchange capacity of heat exchange core 11 itself has decreased. Based on this, it is also necessary to determine whether the current target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature. The purpose of determining the target outdoor wet-bulb temperature and the first switching point temperature is to determine whether outdoor humidity will reduce the evaporation efficiency of the spray water. If the target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature and less than the preset second switching point temperature, it indicates that outdoor humidity has affected the evaporation efficiency of the spray water. Therefore, it is necessary to activate the spray system to increase the amount of spray water sprayed to heat exchange core 11, thereby compensating for the reduced cooling capacity caused by the reduced heat exchange capacity of heat exchange core 11 itself.

[0069] When the target outdoor wet-bulb temperature is within the range of the first switching point temperature and the second switching point temperature, the heat exchange core 11 itself still has heat exchange capacity, but the outdoor humidity has affected the evaporation efficiency of the spray water. Therefore, it is also necessary to determine in which temperature range between the first switching point temperature and the second switching point temperature the target outdoor wet-bulb temperature is, that is, there are multiple temperature ranges between the first switching point temperature and the second switching point temperature. The target outdoor wet-bulb temperature is in a different temperature range, and the outdoor humidity reflected is also different. Therefore, at least one of the second spray group 7 and the first spray group 6 of the spray system can be controlled to open according to the temperature range to adjust the amount of spray water and the spraying method for spraying the heat exchange core 11.

[0070] Among them, the spraying mode is reflected in turning on the second spray group 7 alone, turning on the first spray group 6 alone, and turning on the first spray group 6 and the second spray group 7 at the same time; the spraying water volume is also reflected in the above three methods. When the second spray group 7 is turned on alone, the spraying water volume is less, when the first spray group 6 is turned on alone, the water volume increases, and when the first spray group 6 and the second spray group 7 are turned on at the same time, the spraying water volume is the largest.

[0071] It should be pointed out that in actual applications, the dry bulb temperature is usually greater than or equal to the wet bulb temperature, and the heat exchanger generally has the following operating modes:

[0072] When the outdoor temperature is low, the target outdoor dry-bulb temperature is less than the first switching point temperature, and the unit operates in dry mode;

[0073] When the outdoor temperature is equal to the room temperature, the target outdoor dry-bulb temperature is greater than the first switching point temperature, and the first switching point temperature is less than or equal to the target outdoor wet-bulb temperature and less than the second switching point temperature, the unit operates in wet mode.

[0074] When the outdoor temperature is much higher than the room temperature, the target outdoor wet-bulb temperature is ≥ the second switching point temperature, and the unit operates in mixed mode.

[0075] When the unit operates in dry mode, the spray system and the mechanical refrigeration system are controlled to be closed. Due to the low outdoor temperature, the heat exchange unit can meet the cooling demand by relying solely on the heat exchange core 11 to exchange heat with the outdoor cold air; when the unit operates in wet mode, the spray system is controlled to operate and the mechanical refrigeration system is controlled to be closed. Since the indoor and outdoor temperatures are roughly the same, the heat exchange between the heat exchange core 11 and the outdoor air cannot meet the cooling demand. Therefore, it is necessary to increase the spray system to increase the heat exchange capacity of the heat exchange core 11; when the unit operates in mixed mode, the spray system and the mechanical refrigeration system are controlled to be turned on. Due to the high outdoor temperature, the spray system cannot meet the cooling demand of the heat exchange core 11. Therefore, it is necessary to increase the mechanical refrigeration system to meet the cooling demand.

[0076] The above-mentioned “controlling the opening of at least one of the second spray group 7 and the first spray group 6 of the spray system according to the temperature range” includes:

[0077] If the target outdoor wet-bulb temperature is within the first preset temperature range, the second spray group 7 is turned on and the first spray group 6 is turned off;

[0078] If the target outdoor wet-bulb temperature is within the third preset temperature range, the second spray group 7 is turned off and the first spray group 6 is turned on;

[0079] If the target outdoor wet-bulb temperature is within the second preset temperature range, the second spray group 7 is turned on and the first spray group 6 is turned on;

[0080] The temperature range includes a first preset temperature range close to the first switching point temperature, a second preset temperature range close to the second switching point temperature, and a third preset temperature range between the first preset temperature range and the second preset temperature range.

[0081] When the target outdoor wet-bulb temperature is within the first preset temperature range, it indicates that the target outdoor wet-bulb temperature is close to the first switching point temperature. At this time, when the target outdoor dry-bulb temperature is constant, the lower the target outdoor wet-bulb temperature is, the drier the air is, and the spray water evaporation efficiency of the heat exchange core 11 is high. Therefore, only the second spray group 7 needs to be turned on to meet the heat exchange demand of the heat exchange core 11.

[0082] When the target outdoor wet-bulb temperature is within the third preset temperature range, it indicates that the target outdoor wet-bulb temperature has increased. At this time, the air humidity has increased, and the evaporation efficiency of the spray water of the heat exchange core 11 has decreased. Therefore, the spray water volume and wet film coverage efficiency of the heat exchange core 11 can be increased by turning on the first spray group 6 and turning off the second spray group 7, thereby meeting the heat exchange demand of the heat exchange core 11.

[0083] When the target outdoor wet-bulb temperature is within the second preset temperature range, it means that the target outdoor wet-bulb temperature is close to the second switching point temperature. At this time, the target outdoor wet-bulb temperature is too high, and the air humidity further increases. The evaporation efficiency of the spray water of the heat exchange core 11 will be further reduced. Therefore, the spray water volume and wet film covering efficiency of the heat exchange core 11 can be further increased by simultaneously turning on the first spray group 6 and the second spray group 7, thereby meeting the heat exchange requirements of the heat exchange core 11.

[0084] The above points out that the target outdoor wet-bulb temperature is in the range between the first switching point temperature and the second switching point temperature. Therefore, there is also a situation where the target outdoor wet-bulb temperature is greater than or equal to the second switching point temperature, that is, the unit is in mixed mode. At this time, in addition to turning on the spray system, the mechanical refrigeration system also needs to be turned on to meet the cooling capacity of the unit.

[0085] When the wet-bulb temperature is greater than or equal to the second switching point temperature, it means that the outdoor temperature is too high, the heat exchange capacity of the heat exchange core 11 itself is seriously insufficient, or even loses its heat exchange function, so a mechanical refrigeration system needs to be added to meet the cooling capacity of the unit.

[0086] Specifically, if the target outdoor wet-bulb temperature is greater than or equal to the second switching point temperature, the mechanical refrigeration system is turned on; and at least one of the second spray group 7 and the first spray group 6 is turned on according to the condensing temperature of the mechanical refrigeration system.

[0087] Wherein, opening at least one of the second spray group 7 and the first spray group 6 according to the condensing temperature of the mechanical refrigeration system includes:

[0088] If the target outdoor wet-bulb temperature is within the first preset condensing temperature range, the second spray group 7 is turned on and the first spray group 6 is turned off;

[0089] If the target outdoor wet-bulb temperature is within the second preset condensing temperature range, the second spray group 7 is turned on and the first spray group 6 is turned on;

[0090] The temperature values ​​within the second preset condensing temperature range are greater than those within the first preset condensing temperature range. This means that when the condensing temperature (pressure) of the mechanical refrigeration system is low, only the second spray group 7 can be activated to meet the unit's cooling needs. However, when only the second spray group 7 is activated, the upper end of the heat exchange core 11 is not covered with water, resulting in a higher temperature of the air flowing out of the heat exchange core 11, which increases the condensing temperature (pressure), requiring the mechanical refrigeration system to provide additional cooling capacity. As the condensing temperature (pressure) continues to rise, the first and second spray groups 6 and 7 can be activated simultaneously to cool the air entering the condenser 8.

[0091] In addition, when the unit has a water-saving demand, the opening conditions of the first spray group 6 and the second spray group 7 can be selected according to the above-mentioned condensing temperature (pressure), outdoor temperature and humidity conditions, and cooling demand.

[0092] It can be seen that the control method combines the first spray group 6 and the second spray group 7, and effectively controls the first spray group 6 and the second spray group 7 according to different working conditions of the unit, thereby increasing the spray efficiency and meeting the cooling needs of the unit, so that the unit can better save energy and water in different seasons and load conditions and reduce operating costs.

[0093] The present application also provides a control device for a heat exchanger unit, which can be applied to the above-mentioned control method, and includes:

[0094] Acquisition module: used to obtain the preset first switching point temperature and second switching point temperature;

[0095] A first control module; used to shut down the sprinkler system and the mechanical refrigeration system when the current target outdoor dry-bulb temperature is less than the first switching point temperature;

[0096] A judgment module is used to judge the difference between the target outdoor dry-bulb temperature and the first switching point temperature. When the target outdoor dry-bulb temperature is greater than the first switching point temperature, the judgment module further judges whether the current target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature. If so, the judgment module further judges whether the target outdoor wet-bulb temperature is less than a preset second switching point temperature, and the second switching point temperature is greater than the first switching point temperature.

[0097] Determination module: used for determining the temperature range of the target outdoor wet-bulb temperature when the target outdoor wet-bulb temperature is lower than the preset second switching point temperature;

[0098] The second control module is used to control the opening of at least one of the second spray group 7 and the first spray group 6 of the spray system according to the temperature range.

[0099] The above-mentioned control device can be used to effectively control the heat exchange unit, thereby adjusting the spraying mode and spraying water volume of the spraying system according to different working conditions, so that the unit can better save energy and water under different temperature and humidity conditions.

[0100] The present application also provides a computer device, which includes a processor and a memory, wherein the memory is used to store at least one section of program code, and the at least one section of program code is loaded by the processor and executes any of the control methods described above.

[0101] The present application also provides a computer-readable storage medium, which is used to store at least one section of program code, and the at least one section of program code is used to execute any of the control methods described above.

[0102] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0103] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A heat exchange unit, characterized in that: include: frame; Two rows of heat exchange cores (11), the two rows of heat exchange cores (11) being arranged side by side on the frame along a first direction, and the heat exchange cores (11) being arranged at an inclination, so that an outdoor wind inlet surface and an outdoor wind outlet surface of the heat exchange cores (11) intersect both the first direction and a second direction, and the second direction is perpendicular to the first direction; A spray system, comprising two spray devices respectively arranged corresponding to each of the heat exchange cores (11), the spray devices comprising a first spray group (6) located on the outdoor air outlet side of the corresponding heat exchange core (11) and a second spray group (7) located on the outdoor air inlet side of the corresponding heat exchange core (11); The plurality of nozzles of the first spray group (6) are arranged in sequence along a direction parallel to the outdoor wind outlet surface, and the plurality of nozzles of the second spray group (7) are arranged in sequence along a direction parallel to the outdoor wind inlet surface.

2. The heat exchange unit according to claim 1, characterized in that: Also included is a mechanical refrigeration system, the mechanical refrigeration system comprising: A condenser (8) is arranged on the outdoor air outlet side, and the first spray group (6) is arranged between the condenser (8) and the heat exchange core (11); An evaporator (12) is arranged on the indoor air outlet side of the heat exchange core (11); A compressor is connected to the condenser (8) and the evaporator (12) to form a refrigerant circulation loop of the mechanical refrigeration system.

3. The heat exchange unit according to claim 2, characterized in that: The spraying range of the first spray group (6) at least covers the outdoor wind outlet surface, and the spraying range of the second spray group (7) at least covers the outdoor wind inlet surface; The spraying volume and / or arrangement density of each nozzle of the first spray group (6) and / or the second spray group (7) gradually increases in the direction from the indoor air outlet side to the indoor air return side of the corresponding heat exchange core (11).

4. The heat exchange unit according to claim 1, characterized in that: The spray system further comprises a spray water storage tank (1), the spray water storage tank (1) being connected to the first spray group (6) and the second spray group (7) respectively through a spray water pipe (3), the spray water pipe (3) being provided with a spray water pump (2), and the first spray group (6) and the second spray group (7) being provided with solenoid valves respectively on branches corresponding to the spray water pipe (3).

5. A control method, applicable to the heat exchange unit according to any one of claims 1 to 4, characterized in that: The control method comprises: Acquire a preset first switching point temperature and a second switching point temperature, wherein the second switching point temperature is greater than the first switching point temperature; If the current target outdoor dry-bulb temperature is greater than the first switching point temperature, determine whether the current target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature, and if so, execute the next step; If the target outdoor wet-bulb temperature is less than a preset second switching point temperature, the temperature range in which the target outdoor wet-bulb temperature is located is determined, and at least one of the second spray group (7) and the first spray group (6) of the spray system is controlled to be turned on according to the temperature range.

6. The control method according to claim 5, characterized in that: Controlling the opening of at least one of the second spray group (7) and the first spray group (6) of the spray system according to the temperature range includes: If the target outdoor wet-bulb temperature is within a first preset temperature range in the temperature range, turning on the second spray group (7) and turning off the first spray group (6); If the target outdoor wet-bulb temperature is within a third preset temperature range in the temperature range, closing the second spray group (7) and opening the first spray group (6); If the target outdoor wet-bulb temperature is within a second preset temperature range in the temperature range, turning on the second spray group (7) and turning on the first spray group (6); The temperature interval includes a first preset temperature interval close to the first switching point temperature, a second preset temperature interval close to the second switching point temperature, and a third preset temperature interval between the first preset temperature interval and the second preset temperature interval.

7. The control method according to claim 5, characterized in that: The heat exchange unit also includes a mechanical refrigeration system; The control method further includes: If the target outdoor dry-bulb temperature is lower than the first switching point temperature, shut down the sprinkler system and the mechanical refrigeration system; If the target outdoor wet-bulb temperature is greater than or equal to the second switching point temperature, the mechanical refrigeration system is turned on; and at least one of the second spray group (7) and the first spray group (6) is turned on according to the condensing temperature of the mechanical refrigeration system.

8. The control method according to claim 7, characterized in that: Opening at least one of the second spray group (7) and the first spray group (6) according to the condensing temperature of the mechanical refrigeration system comprises: If the target outdoor wet-bulb temperature is within a first preset condensing temperature range, turning on the second spray group (7) and turning off the first spray group (6); If the target outdoor wet-bulb temperature is within a second preset condensing temperature range, turning on the second spray group (7) and turning on the first spray group (6); Wherein, the temperature value in the second preset condensation temperature range is greater than the temperature value in the first preset condensation temperature range.

9. A control device for a heat exchange unit, characterized in that: The control device comprises: An acquisition module: used to acquire a preset first switching point temperature and a preset second switching point temperature; A first control module; used to shut down the sprinkler system and the mechanical refrigeration system when the current target outdoor dry-bulb temperature is less than the first switching point temperature; A judgment module: used to judge the size of the target outdoor dry-bulb temperature and the first switching point temperature, and when the target outdoor dry-bulb temperature is greater than the first switching point temperature, continue to judge whether the current target outdoor wet-bulb temperature is greater than or equal to the first switching point temperature, and if so, judge whether the target outdoor wet-bulb temperature is less than a preset second switching point temperature, and the second switching point temperature is greater than the first switching point temperature; A determination module: used for determining the temperature interval of the target outdoor wet-bulb temperature when the target outdoor wet-bulb temperature is less than the preset second switching point temperature; A second control module is used for controlling the opening of at least one of the second spray group (7) and the first spray group (6) of the spray system according to the temperature range.

10. A computer device, characterized in that: The computer device comprises a processor and a memory, wherein the memory is used to store at least one section of program code, and the at least one section of program code is loaded by the processor to execute the control method according to any one of claims 5 to 8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store at least one section of program code, and the at least one section of program code is used to execute the control method according to any one of claims 5 to 8.

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