Air conditioning unit and control method and device thereof

Abstract

The invention provides an air conditioning unit and a control method and device thereof, and relates to the field of air conditioners. The refrigerating system comprises a compressor, an evaporator and a condenser which are arranged on a refrigerant circulating flow path; the pre-cooling system comprises an indirect evaporative cooling heat exchange module and a water supply module, the indirect evaporative cooling heat exchange module comprises at least one indirect evaporative cooling heat exchanger, and a dry channel and a wet channel which are matched with each other in a heat exchange mode are arranged in the indirect evaporative cooling heat exchanger; the water supply module is arranged to supply water into the wet channel, so that the wet channel can absorb heat through water evaporation to reduce the temperature of gas in the dry channel and the wet channel; the dry channel is arranged to supply air to the evaporator; the wet channel is arranged to supply air to the condenser; and the water supply module is set to adjust the water supply flow according to the working mode of the air conditioning unit so as to adjust the cooling effect of the pre-cooling system. The scheme is beneficial to improving the energy efficiency of the air conditioning unit so as to reduce the energy consumption of the air conditioning unit.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of air conditioning technology, specifically to an air conditioning unit and its control method and control device. Background Technology

[0002] Currently, my country's economy is in a phase of rapid development, and the pace of new rural construction is accelerating. A 2013 report on building energy conservation by the Chinese Academy of Engineering shows that building energy consumption in my country has been increasing in recent years, accounting for 20-30% of the country's total energy consumption. Among this, rural residential buildings account for approximately 40% of total energy consumption (including biomass energy), while urban residential buildings account for approximately 20%. Heating, ventilation, and air conditioning (HVAC) is a major energy consumer, accounting for about 40% of total residential building energy consumption. Currently, a large portion of residential energy consumption comes from air conditioning, so improving air conditioning energy efficiency to reduce energy consumption has been a continuous focus in this field. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide an air conditioning unit and its control method and control device, which is beneficial to improving the energy efficiency of the air conditioning unit and reducing the energy consumption of the air conditioning unit.

[0004] This application provides an air conditioning unit, including: a refrigeration system comprising a compressor, an evaporator, and a condenser disposed on a refrigerant circulation path; and a pre-cooling system comprising an indirect evaporative cooling heat exchange module and a water supply module. The indirect evaporative cooling heat exchange module includes at least one indirect evaporative cooling heat exchanger, which has a dry channel and a wet channel for heat exchange coordination. The water supply module is configured to supply water to the wet channel, enabling the wet channel to absorb heat through water evaporation to reduce the gas temperature in the dry channel and the wet channel. The dry channel is configured to supply air to the evaporator; the wet channel is configured to supply air to the condenser; and the water supply module is configured to adjust the water supply flow rate according to the operating mode of the air conditioning unit to adjust the cooling effect of the pre-cooling system.

[0005] In this way, the dry channel of the indirect evaporative cooling heat exchanger can output dry, cold air, and the wet channel can output humid, cold air. The dry, cold air can be used for pre-cooling the evaporator's intake air to reduce its heat load, thus improving its cooling capacity. The humid, cold air can be used for pre-cooling the condenser's intake air to reduce its heat load, thus improving its heat dissipation capacity; furthermore, the water vapor in the humid, cold air can evaporate and absorb heat on the condenser, further enhancing its heat dissipation capacity. Therefore, a single indirect evaporative cooling heat exchanger can achieve a dual intake air pre-cooling effect, equivalent to adding two pre-coolers to the refrigeration system. This significantly improves the refrigeration system's energy efficiency, effectively reducing its energy consumption. Since the water supply module's energy consumption is much lower than that of the refrigeration system, this solution effectively reduces the overall energy consumption of the air conditioning unit.

[0006] Furthermore, the water supply module is configured to adjust the water flow rate according to the operating mode of the air conditioning unit to regulate the cooling effect of the pre-cooling system. This facilitates the rational adjustment of the water supply flow rate based on the operating mode of the air conditioning unit, ensuring that the pre-cooling effect meets the cooling demand while also taking into account the energy consumption of the water supply module and ensuring that the water volume in the wet passage is appropriate to avoid excessive air resistance.

[0007] Furthermore, compared to the method of cooling the condenser by pumping water with a water wheel, this method uses the humid cold air output from the indirect evaporative cooling heat exchanger to cool the condenser. This method is conducive to making full use of cooling water and the contact between the humid cold air and the condenser is more uniform, thereby improving the utilization rate of cooling water and the cooling effect on the condenser.

[0008] Based on the above technical solution, the following improvements can be made to this application.

[0009] In an exemplary embodiment, the indirect evaporative cooling heat exchanger is provided with an air inlet, a first air outlet, and a second air outlet; the air inlet is connected to the dry channel and configured to supply air into the dry channel; the first air outlet is connected to the dry channel and configured to supply air into the evaporator; the dry channel is provided with a ventilation hole connected to the wet channel and configured to supply air into the wet channel; the second air outlet is connected to the wet channel and configured to supply air into the condenser.

[0010] In an exemplary embodiment, the indirect evaporative cooling heat exchanger includes a first heat exchange unit and a second heat exchange unit arranged adjacent to each other. The first heat exchange unit is provided with a plurality of dry channels, and adjacent dry channels are separated by partitions. The second heat exchange unit is provided with a wet channel. The adjacent first heat exchange unit and the second heat exchange unit are separated by heat exchange plates so that the dry channels and the wet channels can exchange heat together.

[0011] In an exemplary embodiment, the air inlet and the first air outlet are respectively located at both ends of the dry channel, the ventilation hole is located at the end of the heat exchange plate near the first air outlet, and the second air outlet is located at the end of the wet channel away from the ventilation hole; and / or, the number of at least one of the first heat exchange unit and the second heat exchange unit is multiple, and the first heat exchange unit and the second heat exchange unit are alternately arranged.

[0012] In one exemplary embodiment, there are two indirect evaporative cooling heat exchangers, which are arranged side by side at intervals along the length of the dry channel. The first exhaust vent is located at one end of the two indirect evaporative cooling heat exchangers that are close to each other; and / or, a water-blocking filter is provided at the second exhaust vent.

[0013] In one exemplary embodiment, the wet channel is provided with a wet surface material.

[0014] In one exemplary embodiment, the wet surface material includes an absorbent layer fixed to the inner wall surface of the wet channel.

[0015] In one exemplary embodiment, the upper end of the wet channel is provided with a water inlet, and the water supply module sprays water onto the wet surface material through the water inlet; and / or, the lower side of the indirect evaporative cooling heat exchange module is provided with a water tank, the water tank is configured to collect water dripping from the indirect evaporative cooling heat exchange module, and the lower end of the wet surface material is configured to extend out of the wet channel and be inserted into the water tank.

[0016] In one exemplary embodiment, there are multiple indirect evaporative cooling heat exchangers, and the water supply module includes multiple sets of spray assemblies corresponding one-to-one with the multiple indirect evaporative cooling heat exchangers. Each spray assembly includes a water source switch and a water distributor connected to the water source switch. The water distributor is located above the corresponding indirect evaporative cooling heat exchanger and is configured to distribute water into the wet channel of the corresponding indirect evaporative cooling heat exchanger. The water supply module is configured to adjust the number of spray assemblies opened according to the working mode of the air conditioning unit to adjust the water supply flow rate.

[0017] In one exemplary embodiment, the water supply module further includes a water tank located below the indirect evaporative cooling heat exchange module, configured to supply water to the spray assembly and collect water dripping from the indirect evaporative cooling heat exchange module, and the water source switch includes a water pump.

[0018] In an exemplary embodiment, the air conditioning unit is an integrated air conditioner. The integrated air conditioner is provided with an air inlet, a first air outlet, and a second air outlet. The air inlet is connected to the dry channel and is connected to the outdoor space or the indoor space. The first air outlet is correspondingly arranged with the evaporator and is connected to the indoor space. The second air outlet is correspondingly arranged with the condenser and is connected to the outdoor space.

[0019] This application also provides a control method for an air conditioning unit as described in any of the above embodiments. The control method includes: determining a target operating mode; and controlling the water supply module of the precooling system according to the determined target operating mode.

[0020] In one exemplary embodiment, determining the target operating mode includes: determining the target operating mode based on the ambient temperature T and the ambient humidity H.

[0021] In an exemplary embodiment, determining the target operating mode based on the ambient temperature T and the ambient humidity H includes: determining the target operating mode as a first operating mode based on T > T0 or H > H0; determining the target operating mode as a second operating mode based on T > T0 and H > H0; and determining the target operating mode as a third operating mode based on T < T0 and H < H0; wherein T0 is a set ambient temperature value and H0 is a set ambient humidity value.

[0022] In an exemplary embodiment, the target operating mode includes a first operating mode, a second operating mode, and a third operating mode. The water supply flow rate of the water supply module includes a first flow rate, a second flow rate, and a third flow rate, wherein the first flow rate is less than the second flow rate and greater than the third flow rate. Controlling the water supply module of the precooling system according to the determined target operating mode includes: controlling the water supply module to supply water at the first flow rate based on the target operating mode being the first operating mode; controlling the water supply module to supply water at the second flow rate based on the target operating mode being the second operating mode; and controlling the water supply module to supply water at the third flow rate based on the target operating mode being the third operating mode.

[0023] In an exemplary embodiment, the air conditioning unit further includes an exhaust fan corresponding to the condenser, and the control method further includes controlling the compressor and the exhaust fan according to the inlet air temperature t1, outlet air temperature t2, and condenser temperature t3 of the condenser.

[0024] In an exemplary embodiment, controlling the compressor and the exhaust fan based on the condenser's inlet air temperature t1, outlet air temperature t2, and condenser temperature t3 includes: controlling the exhaust fan to reduce its speed based on t2-t1 > t0; and controlling the exhaust fan to reduce its speed based on t2-t1 < t0 and t3 > t1.s The compressor is controlled to reduce its frequency; based on t2-t1>t0 and t3<t s The exhaust fan speed is reduced; t0 is a set temperature difference value, and t s To set the temperature value.

[0025] In an exemplary embodiment, the air conditioning unit further includes an exhaust fan corresponding to the condenser. Before determining the target operating mode, the control method further includes: acquiring the ambient temperature T and the ambient humidity H; and determining the frequency of the compressor and the rotational speed of the exhaust fan based on the ambient temperature T and the ambient humidity H.

[0026] In an exemplary embodiment, in the step of determining the frequency of the compressor and the rotational speed of the exhaust fan based on the ambient temperature T and the ambient humidity H: the frequency of the compressor is negatively correlated with the ambient temperature T and positively correlated with the ambient humidity H; the rotational speed of the exhaust fan is positively correlated with the ambient temperature T and positively correlated with the ambient humidity H.

[0027] This application also provides a control device, including a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the steps of the control method as described in any of the above embodiments. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structural principle of an air conditioning unit provided in some embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the structure of an indirect evaporative cooling heat exchange module provided in some embodiments of this application;

[0030] Figure 3 This is a partial structural schematic diagram of an indirect evaporative cooling heat exchanger provided in some embodiments of this application;

[0031] Figure 4 A schematic diagram of the planar structure of the first heat exchange unit provided in some embodiments of this application;

[0032] Figure 5 This application provides a schematic diagram of the planar structure of the second heat exchange unit and water distributor in some embodiments.

[0033] Figure 6 This is a schematic diagram of the principle of an indirect evaporative cooling heat exchanger;

[0034] Figure 7 A flowchart illustrating the control method provided in some embodiments of this application;

[0035] Figure 8A schematic flowchart illustrating a control method provided in one embodiment of this application;

[0036] Figure 9 This is a flowchart illustrating a control method provided in one embodiment of this application.

[0037] Figures 1 to 5 The list of components represented by each number is as follows:

[0038] 1 Compressor, 2 Evaporator, 3 Condenser, 4 Indirect Evaporative Cooling Heat Exchange Module, 5 Water Pump, 6 Water Distributor, 7 Water Tank, 8 First Air Duct, 9 Second Air Duct;

[0039] 11 First dry passage, 12 First wet passage, 13 Ventilation hole, 14 Second wet passage, 15 Second dry passage, 16 Second exhaust vent b, 17 First exhaust vent, 18 Second exhaust vent a, 19 Water baffle, 20 First indirect evaporative cooling heat exchanger, 21 Second indirect evaporative cooling heat exchanger, 22 First partition, 23 Second partition, 24 Wet surface material, 25 First end plate, 26 Second end plate, 27 Top plate, 271 Water inlet hole, 28 Bottom plate. Detailed Implementation

[0040] The principles and features of this application are described below with reference to the accompanying drawings. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0041] like Figure 1 As shown in the figure, this application provides an air conditioning unit, including a refrigeration system and a precooling system.

[0042] like Figure 1 As shown, the refrigeration system includes a compressor 1, an evaporator 2, and a condenser 3 located on the refrigerant circulation path. The refrigeration system may also include a throttling mechanism (not shown) located on the refrigerant circulation path. The compressor 1, condenser 3, throttling mechanism, and evaporator 2 can be connected sequentially through refrigerant piping to form a refrigerant circulation loop, thereby realizing the refrigeration function of the air conditioning unit. The refrigerant in the refrigeration system can be ordinary refrigerant or water vapor (in which case compressor 1 is a water vapor compressor).

[0043] The precooling system includes an indirect evaporative cooling heat exchange module 4 and a water supply module. The indirect evaporative cooling heat exchange module 4 includes at least one indirect evaporative cooling heat exchanger. The indirect evaporative cooling heat exchanger has a dry channel (such as the first dry channel 11 and the second dry channel 15 described below) and a wet channel (such as the first wet channel 12 and the second wet channel 14 described below) with heat exchange coordination. The water supply module is configured to supply water to the wet channel, enabling the wet channel to absorb heat through water evaporation to reduce the gas temperature in both the dry and wet channels. The dry channel is configured to supply air to the evaporator 2. The wet channel is configured to supply air to the condenser 3. The indirect evaporative cooling heat exchanger can also be called an indirect evaporative cooling heat exchange core, or simply the core, such as... Figure 8 As shown.

[0044] The working principle of an indirect evaporative cooling heat exchanger can be found in [reference]. Figure 6 As shown, the dry passage provides primary air circulation, while the wet passage provides secondary air circulation, with a water film adhering to the walls of the wet passage. The water in the wet passage evaporates and absorbs heat, causing the secondary air in the wet passage to cool and form humid, cold air. This cold air is then transferred through the passage walls to the primary air in the dry passage, causing the primary air in the dry passage to cool and form dry, cold air.

[0045] In this way, the dry channel of the indirect evaporative cooling heat exchanger can output dry, cold air, and the wet channel can output humid, cold air. For example... Figure 1 As shown, dry, cold air can be used for pre-cooling the air intake of evaporator 2 to reduce its heat load, thereby improving its cooling capacity. Moist, cold air can be used for pre-cooling the air intake of condenser 3 to reduce its heat load, thus improving its heat dissipation capacity. Furthermore, the water vapor in the moist, cold air can evaporate and absorb heat on condenser 3, further enhancing its heat dissipation capacity. Therefore, a single indirect evaporative cooling heat exchanger can achieve a dual air intake pre-cooling effect, essentially adding two pre-coolers to the refrigeration system. This significantly improves the refrigeration efficiency of the system, effectively reducing its energy consumption. Since the energy consumption of the water supply module is much lower than that of the refrigeration system, this solution effectively reduces the overall energy consumption of the air conditioning unit.

[0046] Furthermore, the water supply module is configured to adjust the water flow rate according to the operating mode of the air conditioning unit to regulate the cooling effect of the pre-cooling system. This facilitates the rational adjustment of the water supply flow rate based on the operating mode of the air conditioning unit, ensuring that the pre-cooling effect meets the cooling demand while also taking into account the energy consumption of the water supply module and ensuring that the water volume in the wet passage is appropriate to avoid excessive air resistance.

[0047] In addition, compared with the method of cooling the condenser 3 by pumping water with a water wheel, this method uses the humid cold air output from the indirect evaporative cooling heat exchanger to cool the condenser 3. This is conducive to making full use of the cooling water and the contact between the humid cold air and the condenser 3 is more uniform, thereby improving the utilization rate of cooling water and the cooling effect on the condenser 3.

[0048] In some exemplary embodiments, such as Figure 2 As shown, the indirect evaporative cooling heat exchanger is equipped with an air inlet, a first air outlet 17, and a second air outlet (as described below, second air outlet a 18 and second air outlet b 16). The air inlet is connected to the dry channel and is configured to supply air into the dry channel. The first air outlet 17 is connected to the dry channel and is configured to supply air to the evaporator 2. The dry channel is equipped with a ventilation hole 13 that communicates with the wet channel, as shown below. Figure 2 , Figure 3 and Figure 4 As shown, ventilation opening 13 is configured to supply air into the wet passage. The second exhaust vent is connected to the wet passage and is configured to supply air to the condenser 3.

[0049] During operation, air enters the dry channel through the air inlet. After isothermal cooling within the dry channel, a portion of the air is discharged as dry air from the first exhaust port 17 and flows towards the evaporator 2, serving as the evaporator 2's intake air. The other portion of the air enters the wet channel through the ventilation hole 13, where it undergoes isenthalpic cooling through direct contact with water. It then exits through the second exhaust port and flows towards the condenser 3, serving as the condenser 3's intake air. In this way, the air flowing towards the condenser 3 undergoes two cooling cycles, thus improving the cooling effect on the condenser 3.

[0050] In some exemplary embodiments, the indirect evaporative cooling heat exchanger includes a first heat exchange unit and a second heat exchange unit arranged adjacent to each other. The first heat exchange unit contains multiple dry channels, such as... Figure 3 and Figure 4 As shown. Adjacent dry channels are separated by partitions. The second heat exchange unit contains a wet channel, as shown. Figure 3 and Figure 5 As shown. Adjacent first and second heat exchange units are separated by heat exchange plates to ensure proper heat exchange between the dry and wet channels. The heat exchange plates can be, but are not limited to, aluminum plates, copper plates, or other materials with good thermal conductivity.

[0051] The dry ducts are arranged in multiple, spaced-out configurations to ensure airflow velocity within each duct, thus meeting the air supply requirements of the air conditioning unit. The wet ducts are designed as a single, integrated unit, facilitating the distribution of water throughout the entire wet duct.

[0052] The overall shape of the first heat exchange unit and the second heat exchange unit can be the same, such as... Figure 2 As shown, this allows the indirect evaporative cooling heat exchanger to have a more regular structure, making it easier to process and shape, and also easier to assemble in the air conditioning unit.

[0053] In some exemplary embodiments, such as Figure 3 and Figure 4 As shown, the air inlet and the first air outlet 17 are respectively located at both ends of the dry channel. The ventilation hole 13 is located at the end of the heat exchange plate near the first air outlet 17, as shown... Figure 3 , Figure 4 and Figure 5 As shown, the second exhaust vent is located at the end of the wet passage away from the ventilation hole 13.

[0054] In this way, the gas flow direction in the dry channel is opposite to that in the wet channel, forming a counter-flow indirect evaporative cooling heat exchanger, which is conducive to sufficient heat exchange between the dry channel and the wet channel.

[0055] In some exemplary embodiments, such as Figure 2 As shown, there are multiple instances of at least one of the first heat exchange unit and the second heat exchange unit, and the first heat exchange unit and the second heat exchange unit are arranged alternately. This is beneficial for increasing the air flow rate of the indirect evaporative cooling heat exchanger, and thus for improving the precooling effect of the precooling system.

[0056] In one example, such as Figure 2 As shown, there are multiple first heat exchange units and multiple second heat exchange units, which are arranged alternately in sequence.

[0057] In some exemplary embodiments, such as Figure 2 As shown, there are two indirect evaporative cooling heat exchangers. The two indirect evaporative cooling heat exchangers are arranged side-by-side at intervals along the length of the dry channel. The first exhaust vent 17 is located at one end of the two indirect evaporative cooling heat exchangers that is closer to each other. In other words, the first exhaust vent 17 is located at the end of one indirect evaporative cooling heat exchanger that is closer to the other.

[0058] like Figure 2 As shown, the two indirect evaporative cooling heat exchangers can be referred to as the first indirect evaporative cooling heat exchanger 20 and the second indirect evaporative cooling heat exchanger 21, respectively. The dry channel and wet channel of the first indirect evaporative cooling heat exchanger 20 are referred to as the first dry channel 11 and the first wet channel 12, respectively, and the second exhaust port is referred to as the second exhaust port a 18. The dry channel and wet channel of the second indirect evaporative cooling heat exchanger 21 are referred to as the second dry channel 15 and the second wet channel 14, respectively, and the second exhaust port is referred to as the second exhaust port b 16.

[0059] In this way, the first air outlets 17 of the two indirect evaporative cooling heat exchangers are arranged opposite each other, and both output dry and cold air into the gap between the two indirect evaporative cooling heat exchangers, which facilitates the collection of dry and cold air. The dry and cold air can flow to the evaporator 2 through the first air duct 8. The air conditioning unit may also include a blower, which is arranged corresponding to the first air duct 8 and the evaporator 2, and is configured to allow the gas in the dry passage to flow to the evaporator 2 through the first air duct 8, and finally to the indoor space.

[0060] The air inlets of the two indirect evaporative cooling heat exchangers are arranged opposite each other, located at the ends of the two indirect evaporative cooling heat exchangers that are far apart from each other. This makes it easy to open air inlets on the two opposite side walls of the air conditioning unit casing to meet the air intake requirements of the two indirect evaporative cooling heat exchangers.

[0061] The second exhaust vents of the two indirect evaporative cooling heat exchangers are also located at the ends of the two indirect evaporative cooling heat exchangers that are far apart from each other, and can flow to the condenser 3 through the second air duct 9. The air conditioning unit may also include an exhaust fan, which is configured to correspond to the second air duct 9 and the condenser 3, so that the gas in the humid passage flows to the condenser 3 through the second air duct 9 and finally flows to the outdoor space.

[0062] The dry duct can be set horizontally, while the second air outlet can be set upwards. This helps to separate the air outlet of the wet duct from the air inlet of the dry duct, thus avoiding mutual interference.

[0063] Of course, the number of indirect evaporative cooling heat exchangers is not limited to two; it can also be one, three, four, or more.

[0064] In some exemplary embodiments, such as Figure 2 As shown, a water-blocking filter 19 is installed at the second exhaust vent. The water-blocking filter 19 can filter and block liquid droplets in the humid cold air output from the humid channel, thereby helping to prevent water droplets from forming at the second exhaust vent.

[0065] In some exemplary embodiments, such as Figure 3 As shown, a wet surface material 24 is provided inside the wet channel. The wet surface material 24 can absorb moisture, which helps to improve the evaporative cooling effect of the wet channel.

[0066] In some exemplary embodiments, the wet surface material 24 includes a water-absorbing layer fixed to the inner wall of the wet channel. This prevents the wet surface material 24 from completely filling the wet channel, reducing air resistance within the channel and thus ensuring sufficient airflow to the condenser 3. The water-absorbing layer can be, but is not limited to, a highly absorbent material such as velour. The water-absorbing layer can be fixed to the inner wall of the wet channel by adhesive, snap-fit, or other methods.

[0067] In some exemplary embodiments, the upper end of the wet channel is provided with a water inlet 271, such as... Figure 2 As shown, the water supply module sprays water onto the wet surface material 24 through the water inlet 271. This facilitates the downward flow of water under gravity, ensuring that the entire wet surface material 24 is kept moist. Multiple water inlets 271 can be provided, spaced apart along the length of the wet channel.

[0068] In some exemplary embodiments, such as Figure 1 As shown, a water tank 7 is provided on the lower side of the indirect evaporative cooling heat exchange module 4. The water tank 7 is configured to collect the water dripping from the indirect evaporative cooling heat exchange module 4. The lower end of the wet surface material 24 is configured to extend out of the wet channel and be inserted into the water tank 7.

[0069] In this way, the water tank 7 can collect the water dripping from the indirect evaporative cooling heat exchange module 4, and the wet surface material 24 can automatically absorb the water in the water tank 7 through siphon effect, thereby improving the water utilization rate.

[0070] In one example, the first heat exchange unit includes two first heat exchange plates (not shown in the figure) arranged opposite each other, and a plurality of partitions (such as a first partition 22 and a second partition 23 spaced apart) spaced between the two first heat exchange plates. The partitions divide the space between the two first heat exchange plates into a plurality of dry channels, such as... Figure 4 As shown, the first heat exchange unit has multiple air inlets and multiple first air outlets 17 at its two ends.

[0071] The second heat exchange unit includes two opposing second heat exchange plates (not shown in the figure), two opposing end plates arranged along the length of the dry channel, and a top plate 27 and a bottom plate 28. The two second heat exchange plates, the two end plates (first end plate 25 and second end plate 26), the top plate 27, and the bottom plate 28 enclose a wet channel, as shown in the figure. Figure 5 As shown.

[0072] The adjacent first and second heat exchange plates can be combined into one. A water inlet 271 can be provided on the top plate 27, and a second exhaust vent can be provided at the end of the top plate 27 away from the first ventilation hole 13. A clearance hole (not shown in the figure) for the downward extension of the wetted surface material 24 can be provided on the bottom plate 28.

[0073] In some exemplary embodiments, there are multiple indirect evaporative cooling heat exchangers. The water supply module includes multiple sets of spray assemblies, each corresponding to one of the multiple indirect evaporative cooling heat exchangers. Each spray assembly includes a water source switch and a water distributor 6 connected to the water source switch. The water distributor 6 is positioned above the corresponding indirect evaporative cooling heat exchanger and is configured to distribute water into the wet channel of the corresponding indirect evaporative cooling heat exchanger. The water distributor 6 may include multiple nozzles to spray water into the wet channel from different locations, ensuring uniform water distribution in the wet channel. The water distributor 6 can be normally open, and the opening and closing of the spray assembly can be controlled simply by controlling the opening and closing of the water source switch. Alternatively, the water distributor 6 may have a switch, in which case the opening and closing of the spray assembly needs to be controlled via a hole that controls both the water source switch and the water distributor.

[0074] The water supply module is configured to adjust the number of spray components activated based on the operating mode of the air conditioning unit to regulate the water supply flow.

[0075] In other words, when the corresponding spray assembly is turned on, water can be sprayed into the wet channel of the indirect evaporative cooling heat exchanger corresponding to that spray assembly, and the water supply flow rate is relatively large, thus achieving a highly efficient pre-cooling effect. When the corresponding spray assembly is turned off, water cannot be sprayed into the wet channel of the indirect evaporative cooling heat exchanger corresponding to that spray assembly; at most, moisture can be absorbed by the siphon effect of the wet surface material 24, the water supply flow rate is relatively small, and the pre-cooling effect is relatively small.

[0076] Therefore, by controlling the number of spray components that are turned on, the water supply flow rate of the entire water supply module can be adjusted, thereby adjusting the pre-cooling effect of the indirect evaporative cooling heat exchange module 4.

[0077] For example: the number of indirect evaporative cooling heat exchangers is two, such as... Figure 8 As shown, when both sets of spray components are on, the water supply module has the highest water flow rate, and the pre-cooling effect of the indirect evaporative cooling heat exchange module 4 is the best. When only one set of spray components is on, the water supply module has the second highest water flow rate, and the pre-cooling effect of the indirect evaporative cooling heat exchange module 4 is the second best. When both sets of spray components are off, the water supply module has the lowest water flow rate, and the pre-cooling effect of the indirect evaporative cooling heat exchange module 4 is the least effective.

[0078] Of course, there can also be only one indirect evaporative cooling heat exchanger. One indirect evaporative cooling heat exchanger can have multiple wet channels. The water distributor 6 can include multiple water distribution pipes corresponding to the multiple wet channels. The water supply flow rate of the water supply module can also be adjusted by controlling the number of water distribution pipes. Alternatively, the water supply flow rate of the water supply module can also be adjusted by adjusting the number of nozzles opened by the water distributor 6.

[0079] In some exemplary embodiments, the water supply module further includes a water tank 7, such as Figure 1 As shown, the water tank 7 is located below the indirect evaporative cooling heat exchange module 4 and is configured to supply water to the spray assembly and collect the water dripping from the indirect evaporative cooling heat exchange module 4. The water source switch includes a water pump 5.

[0080] In this way, the water tank 7 is used both to supply water to the spray assembly and to collect water dripping from the indirect evaporative cooling heat exchange module 4, thereby improving the integration of the air conditioning module.

[0081] Of course, the water supply module may not include the water tank 7, but may be connected to an external water source (such as tap water), and the water source switch may include a solenoid valve. Alternatively, the container for supplying water to the spray assembly and the container for collecting water dripping from the indirect evaporative cooling heat exchange module 4 may also be provided separately.

[0082] In some exemplary embodiments, the water in the water supply module is at least partially derived from the condensate of the evaporator 2, thus achieving full utilization of the condensate. In some examples, the condensate of the evaporator 2 does not need to be discharged and is entirely used for the water supply module of the indirect evaporative cooling heat exchanger. In some examples, the water in the water supply module may be entirely derived from the condensate of the evaporator 2. In other examples, the water in the water supply module may be partly derived from the condensate of the evaporator 2 and partly derived from an external water source (such as tap water).

[0083] In some exemplary embodiments, the air conditioning unit is an integrated air conditioner. The integrated air conditioner has an air inlet (not shown in the figure), a first air outlet (not shown in the figure), and a second air outlet (not shown in the figure). The air inlet is connected to a dry duct and to either an outdoor or indoor space. The first air outlet is correspondingly located to the evaporator 2 and is connected to the indoor space. The second air outlet is correspondingly located to the condenser 3 and is connected to the outdoor space.

[0084] When the air inlet is connected to the outdoor space, fresh outdoor air can be introduced into the indirect evaporative cooling heat exchange module 4. The air inlet and the outdoor space can be connected through a fresh air duct. When the air inlet is connected to the indoor space, indoor air can be introduced into the indirect evaporative cooling heat exchange module 4. The air inlet and the indoor space can be connected through an air inlet duct. The first air outlet is connected to the indoor space through an air outlet duct. The second air outlet is connected to the outdoor space through an exhaust duct.

[0085] This integrated air conditioner can be, but is not limited to, a kitchen air conditioner. Kitchen environments are characterized by high humidity and high temperature, leading to high energy consumption from ordinary air conditioners. However, using the air conditioning unit provided in this application embodiment helps improve the cooling efficiency of the refrigeration system, thereby reducing the energy consumption of the air conditioning unit.

[0086] This application also provides a control method for use with an air conditioning unit as described in any of the above embodiments.

[0087] like Figure 7 As shown, the control methods include:

[0088] Step S202: Determine the target operating mode;

[0089] Step S204: Control the water supply module of the precooling system according to the determined target working mode.

[0090] This allows for reasonable adjustment of the water supply flow rate of the water supply module according to the working mode of the air conditioning unit. While ensuring the pre-cooling effect to meet the cooling demand, it also helps to take into account the energy consumption of the water supply module and ensures that the water volume in the wet channel is appropriate to avoid excessive wind resistance.

[0091] In some exemplary embodiments, determining the target operating mode includes: determining the target operating mode based on ambient temperature T and ambient humidity H. Ambient temperature T refers to the ambient temperature of the indoor space to be treated (i.e., the indoor space where the air conditioning unit is located), and ambient humidity H refers to the ambient humidity of the indoor space to be treated, which can be characterized as relative humidity.

[0092] This allows the air conditioning unit to automatically switch to the appropriate operating mode based on environmental conditions, thus improving the intelligence level of the air conditioning unit.

[0093] Of course, the target working mode can also be determined based on external instructions, such as the user manually selecting the target working mode through a remote control, APP, or other means.

[0094] In some exemplary embodiments, determining the target operating mode based on ambient temperature T and ambient humidity H includes:

[0095] Based on T > T0 or H > H0, the target working mode is determined to be the first working mode;

[0096] Based on T > T0 and H > H0, the target working mode is determined to be the second working mode;

[0097] Based on T < T0 and H < H0, the target working mode is determined to be the third working mode;

[0098] T0 is the set ambient temperature value, and H0 is the set ambient humidity value.

[0099] When T > T0 or H > H0, it indicates that the ambient temperature or humidity is too high. The air conditioning unit is under high load and needs to output more cooling capacity to meet the needs of the scenario. Therefore, the target working mode is the first working mode, which can be called the high-load working mode.

[0100] When T > T0 and H > H0, it indicates that the ambient temperature and humidity are too high, so the load on the air conditioning unit is higher and more cooling capacity needs to be output to meet the needs of the scenario. Therefore, the target working mode is the second working mode, which can be called the ultra-high load working mode.

[0101] When T < T0 and H < H0, it indicates that the ambient temperature and humidity are not too high. Therefore, the load of the air conditioning unit is low, and the output of relatively less cooling capacity can meet the needs of the scenario. Thus, the target working mode is the third working mode, which can be called the low-load working mode.

[0102] T0 and H0 can be set appropriately as needed. As for the critical condition T = T0 / H = H0, the target working mode is not limited, and any target working mode corresponding to similar judgment conditions is acceptable.

[0103] In some exemplary embodiments, the target operating mode includes a first operating mode, a second operating mode, and a third operating mode. The water supply flow rate of the water supply module includes a first flow rate, a second flow rate, and a third flow rate. The first flow rate is less than the second flow rate but greater than the third flow rate.

[0104] Control the water supply module of the precooling system according to the determined target operating mode, including:

[0105] Based on the target working mode being the first working mode, the water supply module is controlled to supply water at the first flow rate;

[0106] Based on the target working mode being the second working mode, the water supply module is controlled to supply water at the second flow rate.

[0107] Based on the target operating mode being the third operating mode, the water supply module is controlled to supply water at the third flow rate.

[0108] In the first operating mode, the water supply module supplies water at the highest flow rate. Partial spraying in the wet channels produces a highly efficient pre-cooling effect, enabling the air conditioning unit to meet the cooling demands of high-load scenarios. The water supply module can supply water at the highest flow rate by activating some of its spray components.

[0109] In the second operating mode, the water supply module operates at a second flow rate, with all wet channels spraying water to produce a highly efficient pre-cooling effect, enabling the air conditioning unit to meet the cooling demands of ultra-high load scenarios. The second flow rate can be achieved by activating all spray components of the water supply module.

[0110] In the third operating mode, the water supply module operates at the third flow rate. No water is sprayed from any of the wet channels; at most, water is drawn in through siphon action to moisten the wet channels, achieving a pre-cooling effect. This allows the air conditioning unit to meet the cooling needs of low-load scenarios. The third flow rate can be achieved by shutting off all spray components of the water supply module. When the wet surface material 24 cannot absorb water through siphon action, the third flow rate can be 0. When the wet surface material 24 can absorb water through siphon action, the third flow rate can be the water flow rate absorbed by the wet surface material 24 through siphon action.

[0111] In one embodiment, the number of indirect evaporative cooling heat exchangers (referred to as cores) is two. For example... Figure 8 As shown, when T > T0 and H > H0, and both spray components (water pump 5 and water distributor 6) corresponding to the two indirect evaporative cooling heat exchangers are turned on, the water supply module has the largest water flow rate, and the pre-cooling effect of the indirect evaporative cooling heat exchange module 4 is the best. When T > T0 or H > H0, only one spray component corresponding to the indirect evaporative cooling heat exchanger is turned on, the water supply module has the second largest water flow rate, and the pre-cooling effect of the indirect evaporative cooling heat exchange module 4 is the second best. When T < T0 and H < H0, and both spray components are turned off, the water supply module has the smallest water flow rate, and the wet channel is only wetted by the siphon effect of the wet surface material 24, resulting in the smallest pre-cooling effect of the indirect evaporative cooling heat exchange module 4.

[0112] In some exemplary embodiments, the air conditioning unit further includes an exhaust fan corresponding to the condenser 3, and the control method further includes:

[0113] The compressor 1 and the exhaust fan are controlled based on the inlet air temperature t1, outlet air temperature t2, and condenser temperature t3 of condenser 3.

[0114] In some embodiments, such as Figure 9 As shown, the compressor 1 and exhaust fan are controlled based on the inlet air temperature t1, outlet air temperature t2, and condenser temperature t3 of the condenser 3, including:

[0115] Based on the fact that t2-t1>t0, control the exhaust fan to reduce its speed;

[0116] Based on t2-t1 < t0 and t3 > t s Control compressor 1 to reduce frequency;

[0117] Based on t2-t1>t0 and t3<t s Control the exhaust fan to reduce its speed.

[0118] t0 is the set temperature difference value, t s To set temperature values. t0, t s The size can be reasonably determined according to needs. t0 can be in the range of 3℃ to 5℃.

[0119] When t2-t1>t0, it indicates that the precooling effect of the indirect evaporative cooling heat exchange module 4 is good. Therefore, reducing the speed of the exhaust fan will reduce the motor power of the exhaust fan and help save energy.

[0120] When t2-t1<t0 and t3>t s When the temperature is high, it indicates that the precooling effect of the indirect evaporative cooling heat exchange module 4 is average, but the temperature of the condenser 3 is high. Therefore, it is necessary to reduce the frequency of the compressor 1 to avoid overload operation and ensure the safe operation of the refrigeration system.

[0121] When t2-t1>t0 and t3<t s When the temperature is low, it indicates that the pre-cooling effect of the indirect evaporative cooling heat exchange module 4 is average, but the temperature of the condenser 3 is low. Therefore, the speed of the exhaust fan should be reduced to allow the humid cold air to fully exchange heat with the condenser 3, thereby improving the pre-cooling effect of the indirect evaporative cooling heat exchange module 4.

[0122] As for the critical conditions t2-t1=t0 and t3=t s In this case, there are no restrictions on the control measures for the exhaust fan and compressor 1, and control measures corresponding to similar judgment conditions are all acceptable.

[0123] In some exemplary embodiments, the air conditioning unit also includes an exhaust fan corresponding to the condenser 3, which, before determining the target operating mode, such as Figure 8 As shown, the control method also includes:

[0124] Obtain the ambient temperature T and ambient humidity H;

[0125] The frequency of compressor 1 and the speed of exhaust fan are determined based on the ambient temperature T and ambient humidity H.

[0126] The specific method for determining these parameters is not limited. For example, the correspondence between ambient temperature T, ambient humidity H, and the frequency of compressor 1 and the speed of exhaust fan can be pre-summarized and stored, and then the frequency of compressor 1 and the speed of exhaust fan can be determined through searching, calculation, and other methods.

[0127] In some embodiments, in the step of determining the frequency of compressor 1 and the speed of exhaust fan based on ambient temperature T and ambient humidity H:

[0128] The frequency of compressor 1 is negatively correlated with the ambient temperature T and positively correlated with the ambient humidity H;

[0129] The speed of the exhaust fan is positively correlated with the ambient temperature T and the ambient humidity H.

[0130] In other words, the higher the ambient temperature T, the lower the frequency of compressor 1 should be to avoid overloading compressor 1 and ensure system safety, and the higher the speed of the exhaust fan should be to improve the cooling effect on condenser 3.

[0131] The higher the ambient humidity H, the higher the frequency of compressor 1 and the higher the speed of exhaust fan, so as to efficiently reduce the ambient temperature and thus reduce the ambient humidity.

[0132] This application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, it implements the steps of any of the control methods described in the above embodiments, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0133] The processor may be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), an On-Premises Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor.

[0134] This application also provides a computer storage medium storing a computer program. When the computer program is executed by a processor, it implements the steps of the control method as described in any of the above embodiments, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0135] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0136] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0137] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0138] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0139] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0140] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0141] In any one or more of the exemplary embodiments described above, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functionality may be stored as one or more instructions or code on or transmitted via a computer-readable medium and executed by a hardware-based processing unit. The computer-readable medium may comprise a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium comprising any medium facilitating the transfer of a computer program from one place to another, for example, according to a communication protocol. In this manner, a computer-readable medium may generally correspond to a non-transitory tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. The data storage medium may be any available medium accessible by one or more computers or one or more processors to retrieve instructions, code, and / or data structures for implementing the techniques described in this disclosure. Computer program products may comprise computer-readable media.

[0142] For example, and not as a limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and is accessible by a computer. Furthermore, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient media, but rather refer to non-transient tangible storage media. As used herein, disks and optical discs include compact optical discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks, or Blu-ray discs, where disks typically reproduce data magnetically, while optical discs use lasers to reproduce data optically. The above combinations should also be included within the scope of computer-readable media.

[0143] For example, instructions can be executed by one or more processors, such as one or more digital signal processors (DSPs), general-purpose microprocessors, application-specific integrated circuits (ASICs), field-programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Therefore, the term "processor" as used herein can refer to any of the above-described structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functionality described herein can be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated into combined codecs. Furthermore, the techniques can be fully implemented in one or more circuit or logic elements.

[0144] The technical solutions of the embodiments of this disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs), or a set of ICs (e.g., chipsets). Various components, modules, or units are described in the embodiments of this disclosure to emphasize functional aspects of a device configured to perform the described techniques, but they do not necessarily need to be implemented through different hardware units. Rather, as described above, the various units can be combined in codec hardware units or provided by a collection of interoperable hardware units (including one or more processors as described above) combined with suitable software and / or firmware.

Claims

1. An air conditioning unit, characterized in that, include: A refrigeration system, including a compressor, evaporator, and condenser located in the refrigerant circulation path; A precooling system includes an indirect evaporative cooling heat exchange module and a water supply module. The indirect evaporative cooling heat exchange module includes at least one indirect evaporative cooling heat exchanger, which has a dry channel and a wet channel with heat exchange cooperation. The water supply module is configured to supply water to the wet channel, so that the wet channel can absorb heat through water evaporation to reduce the gas temperature in the dry channel and the wet channel. The dry channel is configured to supply air to the evaporator. The wet passage is configured to supply air to the condenser; and the water supply module is configured to adjust the water supply flow rate according to the operating mode of the air conditioning unit to adjust the cooling effect of the precooling system.

2. The air conditioning unit according to claim 1, characterized in that, The indirect evaporative cooling heat exchanger is provided with an air inlet, a first air outlet, and a second air outlet; the air inlet is connected to the dry channel and is configured to supply air into the dry channel; the first air outlet is connected to the dry channel and is configured to supply air into the evaporator. The dry channel is provided with a ventilation hole that communicates with the wet channel and is configured to supply air into the wet channel; the second exhaust port is communicated with the wet channel and is configured to supply air to the condenser.

3. The air conditioning unit according to claim 2, characterized in that, The indirect evaporative cooling heat exchanger includes a first heat exchange unit and a second heat exchange unit arranged adjacent to each other. The first heat exchange unit is provided with a plurality of dry channels, and the adjacent dry channels are separated by partitions. The second heat exchange unit is provided with a wet channel. The adjacent first heat exchange unit and the second heat exchange unit are separated by heat exchange plates so that the dry channels and the wet channels can exchange heat together.

4. The air conditioning unit according to claim 3, characterized in that, The air inlet and the first air outlet are respectively located at both ends of the dry channel; the ventilation hole is located at the end of the heat exchange plate near the first air outlet; and the second air outlet is located at the end of the wet channel away from the ventilation hole; and / or, The number of at least one of the first heat exchange unit and the second heat exchange unit is multiple, and the first heat exchange unit and the second heat exchange unit are arranged alternately.

5. The air conditioning unit according to claim 2, characterized in that, The number of the indirect evaporative cooling heat exchangers is two, and the two indirect evaporative cooling heat exchangers are arranged side by side at intervals along the length of the dry channel. The first exhaust vent is located at the end of the two indirect evaporative cooling heat exchangers that are close to each other; and / or A water-blocking filter screen is installed at the second exhaust vent.

6. The air conditioning unit according to any one of claims 1 to 5, characterized in that, The wet channel is equipped with wet surface material.

7. The air conditioning unit according to claim 6, characterized in that, The wet surface material includes an absorbent layer, which is fixed to the inner wall of the wet channel.

8. The air conditioning unit according to claim 6, characterized in that, The upper end of the wet channel is provided with a water inlet, and the water supply module sprays water onto the wet surface material through the water inlet; and / or, A water tank is provided on the lower side of the indirect evaporative cooling heat exchange module. The water tank is configured to collect water dripping from the indirect evaporative cooling heat exchange module. The lower end of the wet surface material is configured to extend out of the wet channel and be inserted into the water tank.

9. The air conditioning unit according to any one of claims 1 to 5, characterized in that, The number of indirect evaporative cooling heat exchangers is multiple, and the water supply module includes multiple sets of spray assemblies that correspond one-to-one with the multiple indirect evaporative cooling heat exchangers. The spray assembly includes a water source switch and a water distributor connected to the water source switch. The water distributor is located above the corresponding indirect evaporative cooling heat exchanger and is configured to distribute water into the wet channel of the corresponding indirect evaporative cooling heat exchanger. The water supply module is configured to adjust the number of spray components activated according to the working mode of the air conditioning unit to regulate the water supply flow.

10. The air conditioning unit according to claim 9, characterized in that, The water supply module also includes a water tank located below the indirect evaporative cooling heat exchange module. The water tank is configured to supply water to the spray assembly and collect water dripping from the indirect evaporative cooling heat exchange module. The water source switch includes a water pump.

11. The air conditioning unit according to any one of claims 1 to 5, characterized in that, The air conditioning unit is an integrated air conditioner, which is provided with an air inlet, a first air outlet and a second air outlet. The air inlet is connected to the dry channel and is connected to the outdoor space or the indoor space. The first air outlet is correspondingly set to the evaporator and is connected to the indoor space. The second air outlet is correspondingly set to the condenser and is connected to the outdoor space.

12. A control method, characterized in that, The control method, applied to an air conditioning unit as described in any one of claims 1 to 11, comprises: Define the target working mode; The water supply module of the precooling system is controlled according to the determined target operating mode.

13. The control method according to claim 12, characterized in that, The determination of the target operating mode includes: determining the target operating mode based on the ambient temperature T and the ambient humidity H.

14. The control method according to claim 13, characterized in that, The step of determining the target operating mode based on the ambient temperature T and the ambient humidity H includes: Based on T > T0 or H > H0, the target working mode is determined to be the first working mode; Based on T > T0 and H > H0, the target working mode is determined to be the second working mode; Based on T < T0 and H < H0, the target working mode is determined to be the third working mode; T0 is the set ambient temperature value, and H0 is the set ambient humidity value.

15. The control method according to any one of claims 12 to 14, characterized in that, The target working mode includes a first working mode, a second working mode, and a third working mode. The water supply flow rate of the water supply module includes a first flow rate, a second flow rate, and a third flow rate, wherein the first flow rate is less than the second flow rate and greater than the third flow rate. The step of controlling the water supply module of the precooling system according to the determined target operating mode includes: Based on the target working mode being the first working mode, the water supply module is controlled to supply water at the first flow rate; Based on the target working mode being the second working mode, the water supply module is controlled to supply water at the second flow rate; Based on the target working mode being the third working mode, the water supply module is controlled to supply water at the third flow rate.

16. The control method according to any one of claims 12 to 14, characterized in that, The air conditioning unit further includes an exhaust fan corresponding to the condenser, and the control method further includes: The compressor and the exhaust fan are controlled based on the condenser's inlet air temperature t1, outlet air temperature t2, and condenser temperature t3.

17. The control method according to claim 16, characterized in that, The control of the compressor and the exhaust fan based on the condenser inlet air temperature t1, outlet air temperature t2, and condenser temperature t3 includes: Based on t2-t1>t0, the speed of the exhaust fan is reduced. Based on t2-t1 < t0 and t3 > t s Control the compressor to reduce its frequency; Based on t2-t1>t0 and t3<t s Control the exhaust fan to reduce its speed; t0 is a set temperature difference value, t s To set the temperature value.

18. The control method according to any one of claims 12 to 14, characterized in that, The air conditioning unit also includes an exhaust fan corresponding to the condenser. Before determining the target operating mode, the control method further includes: Obtain the ambient temperature T and ambient humidity H; The frequency of the compressor and the speed of the exhaust fan are determined based on the ambient temperature T and the ambient humidity H.

19. The control method according to claim 18, characterized in that, In the step of determining the frequency of the compressor and the speed of the exhaust fan based on the ambient temperature T and the ambient humidity H: The frequency of the compressor is negatively correlated with the ambient temperature T and positively correlated with the ambient humidity H; The rotational speed of the exhaust fan is positively correlated with the ambient temperature T and the ambient humidity H.

20. A control device, characterized in that, It includes a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the steps of the control method as described in any one of claims 12 to 19.

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