Method and device for cooling outdoor heat exchanger and air conditioner

Abstract

The invention relates to the technical field of air conditioner cooling, and discloses a method for cooling an outdoor heat exchanger, which comprises the following steps: determining a target air enthalpy value under the condition that the outdoor heat exchanger needs to be cooled; determining the target relative humidity of the air according to the water fee, the electric fee and the heat exchange amount of the outdoor heat exchanger; and according to the target air enthalpy value and the target relative humidity, the target total spraying water amount is determined. Therefore, the influence of the electricity consumption, the water consumption and the heat exchange amount of the outdoor heat exchanger on the cooling cost is considered at the same time, the target relative humidity of the air is determined by integrating the water fee, the electricity fee and the heat exchange amount of the outdoor heat exchanger, the cooling cost can be considered, and the cooling effect can be guaranteed. Thus, the target total spraying water amount is determined based on the target air enthalpy value and the target humidity, and the target total spraying water amount can meet the cooling requirement of the outdoor heat exchanger and can reduce the cost to the maximum extent. The invention further discloses a device for cooling the outdoor heat exchanger and an air conditioner.

Description

Technical Field

[0001] This application relates to the technical field of air conditioner cooling, for example, to a method and device for cooling an outdoor heat exchanger, and an air conditioner. Background Art

[0002] When the existing air conditioner operates in the cooling mode, if the outdoor temperature is relatively high, it will cause the compressor discharge temperature and pressure to be relatively high, which is likely to cause a high-temperature and high-pressure alarm of the compressor. Moreover, under the limitation of high temperature and high pressure, only increasing the compressor frequency cannot improve the cooling capacity of the air conditioner, which seriously affects the user experience.

[0003] To solve the problem of compressor high-temperature alarm, related technologies provide an air conditioning system, including: an air conditioning main unit and a spraying device, the air conditioning main unit includes: a compressor and an outdoor heat exchanger; the spraying device includes: a temperature sensor, a current sensor, a connecting water pipe, a perforated water pipe, a controller, and a solenoid valve; one end of the connecting water pipe is connected to a water inlet device; the other end of the connecting water pipe is connected to the perforated water pipe, and the surface of the perforated water pipe is provided with a plurality of through holes, and each through hole is provided with a nozzle; the perforated water pipe is arranged on one side adjacent to the outdoor heat exchanger; the temperature sensor is connected to the controller for measuring the temperature value of the outdoor machine air inlet side and sending the temperature value to the controller; the current sensor is connected to the controller for measuring the current value of the compressor and sending the current value to the controller; the solenoid valve is communicated with the connecting water pipe and connected to the controller; the controller is configured to: control the opening or closing of the solenoid valve according to the current value and the temperature value.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related technologies:

[0005] Although the related technologies can spray water mist on the outdoor heat exchanger by arranging a spraying water pipeline on the outdoor unit to achieve the cooling and pressure reduction effect by using the evaporation cooling of the water mist. However, the related technologies only simply adjust the opening and closing of the water circuit by the compressor current and the temperature of the outdoor heat exchanger, and cannot accurately control the spraying water volume, resulting in a relatively high cost.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To gain a basic understanding of some aspects of the disclosed embodiments, a simple summary is provided below. This summary is not a general review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments. Instead, it serves as a preface to the subsequent detailed description.

[0008] Embodiments of the present disclosure provide a method, a device, and an air conditioner for cooling an outdoor heat exchanger to reduce the cooling cost of the outdoor heat exchanger.

[0009] In some embodiments, the method for cooling the outdoor heat exchanger includes: determining a target air enthalpy value when the outdoor heat exchanger needs to be cooled; determining a target relative humidity of the air based on water cost, electricity cost, and the heat exchange amount of the outdoor heat exchanger; and determining a total target spray water amount based on the target air enthalpy value and the target relative humidity. In this way, considering the impacts of power consumption, water consumption, and the heat exchange amount of the outdoor heat exchanger on the cooling cost, and determining the target relative humidity of the air by comprehensively considering water cost, electricity cost, and the heat exchange amount of the outdoor heat exchanger, it is possible to balance the cooling cost and ensure the cooling effect. Thus, based on the target air enthalpy value and the target humidity, the total target spray water amount is determined. The total target spray water amount can not only meet the cooling requirement of the outdoor heat exchanger but also minimize the cost to the greatest extent.

[0010] In some embodiments, determining the target air enthalpy value includes: calculating the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure of the air before humidification; and calculating the air enthalpy value before humidification based on the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure. In this way, the air enthalpy value before humidification can be calculated based on the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure of the air before humidification; and the air enthalpy value before humidification is used as the target air enthalpy value. In this way, the method of isenthalpic humidification is used to cool the outdoor heat exchanger, without additional energy consumption, which can further reduce the cost.

[0011] In some embodiments, determining the target relative humidity of the air based on water cost, electricity cost, and the heat exchange amount of the outdoor heat exchanger includes: obtaining a water cost model, an electricity cost model, and a heat exchanger heat exchange amount model; obtaining the relative humidity corresponding to the minimum water cost and electricity cost and the maximum heat exchange amount of the heat exchanger based on the water cost model, the electricity cost model, and the heat exchanger heat exchange amount model; and using the obtained relative humidity as the target relative humidity. In this way, by comprehensively considering the spray cooling effect, spray cooling efficiency, electricity cost, and water cost, the optimal value of the relative humidity when the water cost is the minimum, the electricity cost is the minimum, and the heat exchange amount is the maximum can be solved, that is, the target humidity.

[0012] In some embodiments, determining the total target spray water volume based on the target air enthalpy value and the target relative humidity includes: determining the dry bulb temperature after humidification according to the target air enthalpy value and the target relative humidity; and determining the total target spray water volume according to the dry bulb temperature after humidification. In this way, the dry bulb temperature after humidification can be determined based on the target air enthalpy value and the target relative humidity, and then the total target spray water volume can be determined.

[0013] In some embodiments, determining the total target spray water volume according to the dry bulb temperature after humidification includes: determining the saturated water vapor pressure of the dry bulb after humidification according to the dry bulb temperature after humidification; and determining the total target spray water volume according to the saturated water vapor pressure of the dry bulb after humidification, the target relative humidity, and the atmospheric pressure. In this way, the saturated water vapor pressure of the dry bulb after humidification is further determined using the obtained dry bulb temperature after humidification, and then the total target spray water volume is obtained by combining the atmospheric pressure of the current environment and the previously obtained target relative humidity.

[0014] In some embodiments, determining that the outdoor heat exchanger needs to be cooled is performed by: obtaining the outdoor ambient temperature and the exhaust temperature of the compressor; and determining that the outdoor heat exchanger needs to be cooled when the outdoor ambient temperature is greater than a first temperature threshold and the exhaust temperature is greater than a second temperature threshold. In this way, considering the environment where the outdoor heat exchanger is located and its own operating state, it is determined whether the outdoor heat exchanger needs to be cooled to obtain a more accurate judgment result.

[0015] In some embodiments, after determining the total target spray water volume, the method further includes: controlling the spray system to start; when the spray water volume is less than the total target spray water volume, if the outdoor ambient temperature is less than or equal to the first temperature threshold, and / or the exhaust temperature is less than or equal to the second temperature threshold, obtaining the start duration of the spray system; and controlling the operation of the spray system according to the start duration. In this way, it can not only ensure effective cooling of the outdoor heat exchanger and avoid frequent start and stop of the spray system, but also save energy.

[0016] In some embodiments, when controlling the spray system to start, the method further includes: controlling the number of nozzles of the spray system to start according to the outdoor ambient temperature. In this way, a reasonable number of nozzles are controlled to start based on the outdoor ambient temperature to effectively cool the outdoor heat exchanger.

[0017] In some embodiments, the device for cooling the outdoor heat exchanger includes: a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned method for cooling the outdoor heat exchanger when running the program instructions.

[0018] In some embodiments, the air conditioner includes: an outdoor unit including an outdoor heat exchanger; a spraying system for spraying water mist onto the outdoor heat exchanger; and the device for cooling the outdoor heat exchanger as described above, which is communicatively connected to the spraying system to control the opening or closing of the spraying system.

[0019] The method, device, and air conditioner for cooling an outdoor heat exchanger provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] First, a target air enthalpy value is determined when the outdoor heat exchanger needs to be cooled. At the same time, considering the influence of power consumption, water consumption, and the heat exchange amount of the outdoor heat exchanger on the cooling cost, the target relative humidity of the air is determined by comprehensively considering the water cost, electricity cost, and the heat exchange amount of the outdoor heat exchanger. In this way, the obtained target relative humidity can not only take into account the cooling cost but also ensure the cooling effect. Thus, based on the target air enthalpy value and the target humidity, the target total spraying water volume is determined. The target total spraying water volume can not only meet the cooling requirements of the outdoor heat exchanger but also reduce the cost to the greatest extent.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0023] Figure 1 is a schematic diagram of a method for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of a method for determining a target air enthalpy value provided by an embodiment of the present disclosure;

[0025] Figure 3 is a schematic diagram of a method for determining the target relative humidity of air according to the water cost, electricity cost, and the heat exchange amount of the outdoor heat exchanger provided by an embodiment of the present disclosure;

[0026] Figure 4 is a schematic diagram of the change in moisture content and dry-bulb temperature when isenthalpic humidification is performed to different relative humidities provided by an embodiment of the present disclosure;

[0027] Figure 5 is a schematic diagram of another method for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure;

[0028] Figure 6 is a schematic diagram of another method for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure;

[0029] Figure 7 It is a schematic diagram of another method for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure;

[0030] Figure 8 It is a schematic diagram of a device for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure;

[0031] Figure 9 It is a schematic diagram of another device for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure;

[0032] Figure 10 It is a schematic diagram of an air conditioner provided by an embodiment of the present disclosure. Detailed implementation manners

[0033] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0034] In the description of the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way may be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0035] Unless otherwise specified, the term "plurality" means two or more.

[0036] In the embodiments of the present disclosure, the character " / " indicates that the front and rear objects are in an "or" relationship. For example, A / B means: A or B.

[0037] The term "and / or" is a description of the associated relationship of an object and indicates that three relationships may exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0038] The term "corresponding" may refer to an associated relationship or a binding relationship. A corresponding to B means that there is an associated relationship or a binding relationship between A and B.

[0039] In the embodiments of the present disclosure, a spray system is adopted to spray water mist on the outdoor heat exchanger to cool the outdoor heat exchanger. The spray system includes a plurality of nozzles, and the plurality of nozzles are evenly distributed around the outdoor heat exchanger. Each nozzle can be independently controlled to be opened or closed. It should be noted that the spray system can adopt an existing spray structure, and no limitation is imposed on it in this embodiment.

[0040] Combined with Figure 1 As shown, the embodiments of the present disclosure provide a method for cooling an outdoor heat exchanger, including:

[0041] S101, when the outdoor heat exchanger needs to be cooled, the processor determines the target air enthalpy value.

[0042] S102, the processor determines the target moisture content of the air according to the water fee, electricity fee, and heat exchange amount of the outdoor heat exchanger.

[0043] S103, the processor determines the target total spray water volume according to the target air enthalpy value and the target relative humidity.

[0044] When the outdoor heat exchanger needs to be cooled and before the spray system is controlled to be turned on, determine the target air enthalpy value that the humidified air needs to reach. After the spray system is turned on, water resources and electrical resources will be consumed, and at the same time, the heat exchange amount of the outdoor heat exchanger will affect the cooling effect of the outdoor heat exchanger. Therefore, determine the target relative humidity of the humidified air according to the water fee, electricity fee, and heat exchange amount of the outdoor heat exchanger, and then determine the target total spray water volume required for the spray system according to the target air enthalpy value and the target relative humidity. After controlling the spray system to be turned on, when the target total spray water volume is sprayed, control the spray system to be turned off.

[0045] Adopting the method for cooling an outdoor heat exchanger provided by the embodiments of the present disclosure, first determine the target air enthalpy value when the outdoor heat exchanger needs to be cooled. At the same time, consider the influence of power consumption, water consumption, and heat exchange amount of the outdoor heat exchanger on the cooling cost, and comprehensively determine the target relative humidity of the air according to the water fee, electricity fee, and heat exchange amount of the outdoor heat exchanger. In this way, the obtained target relative humidity can not only take into account the cooling cost but also ensure the cooling effect. Thus, determine the target total spray water volume based on the target air enthalpy value and the target humidity. The target total spray water volume can not only meet the cooling requirements of the outdoor heat exchanger but also reduce the cost to the greatest extent.

[0046] In addition, the obtained target total spray water volume is matched based on the heat exchange amount of the outdoor heat exchanger, and the result is more accurate, which can avoid the problem that insufficient water volume affects cooling, and thus can improve the spray evaporation efficiency.

[0047] Combined with Figure 2 As shown, S101, the processor determines the target air enthalpy value, including:

[0048] S111, the processor calculates the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure of the air before humidification.

[0049] S121, the processor calculates the enthalpy value of the air before humidification based on the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure.

[0050] S131, takes the enthalpy value of the air before humidification as the target air enthalpy value.

[0051] When calculating the enthalpy value of the air before humidification, first select the calculation formula according to the dry-bulb temperature td. If td < 0°C, then select formula (1) to calculate the dry-bulb saturated water vapor pressure Psdb and the wet-bulb saturated water vapor pressure Pswb of the air. If td > 0°C, then select formula (2) to calculate the dry-bulb saturated water vapor pressure Psdb and the wet-bulb saturated water vapor pressure Pswb of the air. When calculating, replace p in the formula s with Psdb or Pswb.

[0052]

[0053] Among them, when calculating Psdb, T is the dry-bulb standard temperature. When calculating Pswb, T is the wet-bulb standard temperature. C1 to C13 are coefficients, and the specific values can be referred to Table 1.

[0054] Table 1 Values of C1 to C13

[0055] C1 -5674.54 C8 -5800.22 C2 6.392 C9 1.391499 C3 2.67E-30 C10 -0.04864 C4 6.22E-07 C11 4.17648E-05 C5 2.07E-09 C12 -1.44521E-08 C6 -9.5E-13 C13 6.545967 C7 4.163502

[0056] Then calculate the enthalpy value of the air before humidification based on the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure. Specifically:

[0057] Calculate the water vapor partial pressure Pw according to formula (3):

[0058] Pw = Pswb - 0.000662×B×(Td - Tw) Formula (3)

[0059] Among them, B is the atmospheric pressure, Td is the dry-bulb standard temperature, and Tw is the wet-bulb standard temperature. Conduct statistics on the high-temperature weather in summer in the area where the outdoor heat exchanger is located, use a temperature of 35°C or above as the judgment standard, record the local temperature and take the average dry-bulb standard temperature as the Td value, and the average wet-bulb standard temperature as the Tw value. There is a certain conversion relationship between Td and td: Td = 273.15 + td (i.e., the conversion between Kelvin and Celsius). Similarly, Tw = 273.15 + tw (tw is the wet-bulb temperature).

[0060] Calculate the relative humidity RH according to formula (4):

[0061] RH = Pw / Psdb Formula (4)

[0062] Calculate the moisture content d according to formula (5):

[0063] d = 622 × (RH × Psdb / (B - RH × Psdb)) Formula (5)

[0064] Calculate the air enthalpy value h according to formula (6):

[0065] h = 1.01 × t d + d × (2500 + 1.84 × t d ) / 1000 Formula (6)

[0066] Take the air enthalpy value before humidification as the target air enthalpy value. In this way, in the way of isenthalpic humidification, the evaporation cooling of water mist is used to cool down and reduce the pressure of the outdoor heat exchanger. The isenthalpic humidification process is a process of cooling and humidifying. During the whole process, the air enthalpy value remains unchanged, the moisture content of the air increases, and the relative humidity increases. When water changes from small droplets to water vapor, it absorbs the heat in the air, which will further reduce the air temperature. That is, isenthalpic humidification is a humidification process in which the air enthalpy value remains unchanged before and after humidification but the temperature will decrease. Isenthalpic humidification does not require an external heat source. By directly contacting the water mist with the air, the heat of the air itself is used for evaporation, thereby increasing the air humidity. This humidification method does not require additional energy consumption, so the cost can be further reduced.

[0067] Combined with Figure 3 shown in S102, determine the target relative humidity of the air according to the water fee, electricity fee and the heat exchange amount of the outdoor heat exchanger, including:[[]]

[0068] S112, the processor obtains the water fee model, electricity fee model and heat exchanger heat exchange amount model.

[0069] S122, the processor obtains the relative humidity corresponding to the minimum water fee and electricity fee and the maximum heat exchange amount of the heat exchanger according to the water fee model, electricity fee model and heat exchanger heat exchange amount model.

[0070] S132, the processor takes the obtained relative humidity as the target relative humidity.

[0071] For spray cooling, the more the spraying water volume, the better the cooling effect, but the more the electricity fee for consuming the pump power and the water fee for consuming water resources. Therefore, the water volume cannot be increased blindly.

[0072] Figure 4 Shows the calculated dry bulb temperature change and moisture content change at different relative humidities after spraying water mist under the conditions of dry bulb temperature of 35 °C and wet bulb temperature of 24 °C. From Figure 4It can be seen that as the set relative humidity increases, the moisture content growth trend slows down, and the decline of the dry bulb temperature also slows down. This means that the higher the set relative humidity, the lower the spray cooling efficiency will be.

[0073] On this basis, a calculation model is established to calculate the optimal relative humidity after spraying. Set the water cost COSTwater, electricity cost COSTele, and the heat transfer amount Q of the outdoor heat exchanger as the final optimization goals, and the calculated values are as follows:

[0074] Water cost model: COSTwater = price_m × m, where price_m is the water price and m is the water volume.

[0075] According to the above, the water cost is a function of the relative humidity RH2 of the air after spraying the water mist: COSTwater = f1(RH2).

[0076] Electricity cost model: COSTele = price_e × H, where price_e is the electricity price and H is the power consumption of the compressor.

[0077] The power consumption of the fan and other electrical control components remains unchanged. The influence mechanism of the water mist spraying on the power consumption of the compressor is as follows: after spraying the water mist, the water mist evaporates and absorbs heat, the condensation temperature and condensation pressure of the condenser decrease, which in turn causes the exhaust pressure and exhaust temperature of the compressor to decrease, resulting in a decrease in the compressor speed and a reduction in power consumption.

[0078] Therefore, the target total spraying water volume m is negatively correlated with the power consumption H of the compressor. The specific quantitative relationship can be obtained by fitting the experimental test data as H = f(m), then COSTele = f(H) = f(m) = f2(RH2)

[0079] Outdoor heat exchanger heat transfer amount model: Q = Q0 + cm(t2 - t1), where Q0 is the original heat transfer design value without spray cooling, c is the specific heat capacity at constant pressure of water, m is the target total spraying water volume, t2 and t1 are the water temperature and the outdoor dry bulb temperature respectively. Therefore, the heat transfer amount of the heat exchanger is a function of the relative humidity of the air after spraying the water mist Q = f3(RH2).

[0080] According to the above water cost model, electricity cost model, and heat exchanger heat transfer amount model, that is, considering the spray cooling effect, spray cooling efficiency, electricity cost, and water cost comprehensively, we can get RH2 = f(COSTwater, COSTele, Q). Further solving can obtain the optimal value of the relative humidity RH2 when COSTwater is the smallest, COSTele is the smallest, and Q is the largest, which is the target humidity.

[0081] Optionally, the value range of the target humidity is preferably 70% to 90%.

[0082] Combined withFigure 5 As shown in Figure 5 , an embodiment of the present disclosure provides another method for cooling an outdoor heat exchanger, including:

[0083] S101, when the outdoor heat exchanger needs to be cooled, the processor determines the target air enthalpy value.

[0084] S102, the processor determines the target relative humidity of the air according to the water fee, electricity fee and the heat exchange amount of the outdoor heat exchanger.

[0085] S113, the processor determines the dry bulb temperature after humidification according to the target air enthalpy value and the target relative humidity.

[0086] S123, determine the total target spray water volume according to the dry bulb temperature after humidification.

[0087] The dry bulb temperature after humidification is calculated using formula (5) and formula (6). Specifically, substituting formula (5) into formula (6), formula (6) becomes a relational expression of h with respect to td, RH, and Psdb. As can be seen from formula (2), Psdb can be expressed by Td, and Td can be expressed by td. Thus, formula (6) becomes a relational expression of h with respect to td and RH. Both the humidified h and RH are known quantities, so the dry bulb temperature td after humidification can be obtained. Then, the total target spray water volume is determined according to the dry bulb temperature after humidification. In this way, by combining multiple formulas, the dry bulb temperature after humidification can be determined based on the target air enthalpy value and the target relative humidity, and then the total target spray water volume can be determined.

[0088] Optionally, in S123, the processor determines the target moisture content according to the dry bulb temperature after humidification, including:

[0089] The processor determines the saturated water vapor pressure of the dry bulb after humidification according to the dry bulb temperature after humidification.

[0090] The processor determines the total target spray water volume according to the saturated water vapor pressure of the dry bulb after humidification, the target relative humidity, and the atmospheric pressure.

[0091] Substitute the obtained dry bulb temperature after humidification into formula (1) or formula (2) to obtain the saturated water vapor pressure Psdb of the dry bulb after humidification. Substitute the humidified Psdb into formula (5). Since RH in formula (5) is the known target relative humidity, the target moisture content can be solved. Then substitute the target moisture content into formula (7) to obtain the total target spray water volume:

[0092] m = q×(d2×ρ2 - d1×ρ1) Formula (7)

[0093] Wherein, q is the air volume of the outdoor unit, which is related to the rotation speed of the outdoor fan and is a set value. d2 is the target moisture content of the air after humidification, and ρ2 is the water density after humidification. d1 is the moisture content of the air before humidification, and ρ1 is the water density before humidification. It should be noted that the air temperature will change after spraying water mist, and the water density is affected by temperature. Therefore, ρ1 and ρ2 will be slightly different.

[0094] In this way, the dry-bulb saturation water vapor pressure after humidification is further determined using the obtained dry-bulb temperature after humidification, and then the target total spray water volume is solved by combining the atmospheric pressure of the current environment and the obtained target relative humidity.

[0095] Optionally, the processor determines that the outdoor heat exchanger needs to be cooled in the following manner:

[0096] The processor obtains the outdoor ambient temperature and the exhaust temperature of the compressor.

[0097] The processor determines that the outdoor heat exchanger needs to be cooled when the outdoor ambient temperature is greater than the first temperature threshold and the exhaust temperature is greater than the second temperature threshold.

[0098] Obtain the outdoor ambient temperature ts and the exhaust temperature tp of the compressor. If ts > t1 and tp > t2, it means that the ambient temperature where the outdoor heat exchanger is located is relatively high and the temperature of the outdoor heat exchanger itself is relatively high. Then it is determined that the outdoor heat exchanger needs to be cooled. Conversely, if ts ≤ t1 and / or tp ≤ t2, it is determined that the outdoor heat exchanger does not need to be cooled. In this way, considering the environment where the outdoor heat exchanger is located and its own operating state, it is judged whether the outdoor heat exchanger needs to be cooled to obtain a more accurate judgment result.

[0099] Combined Figure 6 As shown, the embodiments of the present disclosure provide another method for cooling the outdoor heat exchanger, including:

[0100] S101, when the outdoor heat exchanger needs to be cooled, the processor determines the target air enthalpy value.

[0101] S102, the processor determines the target moisture content of the air according to the water cost, electricity cost, and the heat exchange amount of the outdoor heat exchanger.

[0102] S103, the processor determines the target total spray water volume according to the target air enthalpy value and the target relative humidity.

[0103] S104, the processor controls the spray system to turn on.

[0104] S105, when the spray water volume is less than the target total spray water volume, if the outdoor ambient temperature is less than or equal to the first temperature threshold, and / or, the exhaust temperature is less than or equal to the second temperature threshold, the processor obtains the opening duration of the spray system.

[0105] S106. The processor controls the operation of the spraying system according to the opening duration.

[0106] After determining that the outdoor heat exchanger needs to be cooled down and determining the target total spraying water volume, the spraying system is controlled to be turned on to spray water mist onto the outdoor heat exchanger. When the spraying water volume is less than the target total spraying water volume, if ts ≤ t1 and / or tp ≤ t2, it indicates that the outdoor heat exchanger has been effectively cooled down before the spraying water volume reaches the target total water volume. To save energy, the spraying system can be turned off at this time. However, to ensure that the temperature of the outdoor heat exchanger does not rise rapidly after the spraying system is turned off, it is necessary to further obtain the opening duration of the spraying system. The operation of the spraying system is controlled according to the opening duration of the spraying system. In this way, it is possible to ensure that the outdoor heat exchanger is effectively cooled down, avoid frequent start and stop of the spraying system, and save energy.

[0107] Optionally, if the opening duration of the spraying system is greater than the duration threshold, it indicates that the spraying system has been turned on for a long time, and the temperature of the outdoor heat exchanger can be maintained at an appropriate temperature for a long period of time. Therefore, the spraying system is controlled to be turned off. Optionally, the duration threshold is set to 3 minutes.

[0108] Combined Figure 7 As shown, another method for cooling the outdoor heat exchanger provided by an embodiment of the present disclosure includes:

[0109] S101. When the outdoor heat exchanger needs to be cooled down, the processor determines the target air enthalpy value.

[0110] S102. The processor determines the target moisture content of the air according to the water fee, electricity fee, and heat exchange amount of the outdoor heat exchanger.

[0111] S103. The processor determines the target total spraying water volume according to the target air enthalpy value and the target relative humidity.

[0112] S104. The processor controls the spraying system to be turned on.

[0113] S107. The processor controls the number of opened nozzles of the spraying system according to the outdoor ambient temperature.

[0114] S105. When the spraying water volume is less than the target total spraying water volume, if the outdoor ambient temperature is less than or equal to the first temperature threshold, and / or the exhaust temperature is less than or equal to the second temperature threshold, the opening duration of the spraying system is obtained.

[0115] S106. The processor controls the operation of the spraying system according to the opening duration.

[0116] When the controlled spray system is turned on, the number of nozzles turned on is further controlled according to the outdoor ambient temperature. Optionally, the higher the outdoor ambient temperature, the faster the outdoor heat exchanger needs to be cooled, and the more nozzles are turned on. The more nozzles are turned on, the more water mist is ejected per unit time, and the faster the outdoor heat exchanger is cooled. In this way, a reasonable number of nozzles are turned on based on the outdoor ambient temperature to effectively cool the outdoor heat exchanger.

[0117] Optionally, in S106, the processor controls the operation of the spray system according to the opening duration, including:

[0118] When the outdoor ambient temperature is greater than or equal to the first temperature threshold and less than the third temperature threshold, the processor controls the nozzles to open the first quantity.

[0119] When the outdoor ambient temperature is greater than or equal to the third temperature threshold and less than the fourth temperature threshold, the processor controls the nozzles to open the second quantity.

[0120] When the outdoor ambient temperature of the processor is greater than or equal to the fourth temperature threshold, the processor controls the nozzles to open the third quantity.

[0121] Wherein, the first quantity is less than the second quantity, and the second quantity is less than the third quantity.

[0122] In this way, by setting the third temperature threshold and the fourth temperature threshold, the temperature range where the outdoor ambient temperature is greater than the first temperature threshold is divided into different levels. As the outdoor ambient temperature level gets higher and higher, the number of nozzles turned on gets more and more, so as to cool the outdoor heat exchanger faster and faster, thereby ensuring the normal operation of the outdoor heat exchanger.

[0123] Combined Figure 8 As shown, an apparatus 80 for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure includes: a first determination module 81, a second determination module 82, and a third determination module 83. The first determination module 81 is configured to determine a target air enthalpy value when the outdoor heat exchanger needs to be cooled. The second determination module 82 is configured to determine a target moisture content of the air according to the water fee, the electricity fee, and the heat exchange amount of the outdoor heat exchanger. The third determination module 83 is configured to determine a target total spray water volume according to the target air enthalpy value and the target relative humidity.

[0124] Using the device 80 for cooling an outdoor heat exchanger provided by an embodiment of the present disclosure, first determine the target air enthalpy value when the outdoor heat exchanger needs to be cooled. At the same time, considering the influence of power consumption, water consumption and heat transfer amount of the outdoor heat exchanger on the cooling cost, comprehensively determine the target relative humidity of the air based on the water fee, electricity fee and heat transfer amount of the outdoor heat exchanger. In this way, the obtained target relative humidity can not only take into account the cooling cost but also ensure the cooling effect. Thus, determine the target total spray water volume based on the target air enthalpy value and the target humidity. The target total spray water volume can not only meet the cooling requirement of the outdoor heat exchanger but also reduce the cost to the greatest extent..

[0125] Combined with Figure 9 As shown, an embodiment of the present disclosure provides a device 90 for cooling an outdoor heat exchanger, including a processor 91 and a memory 92. Optionally, the device 90 may further include a communication interface 93 and a bus 94. Among them, the processor 91, the communication interface 93, and the memory 92 can complete mutual communication through the bus 94. The communication interface 93 can be used for information transmission. The processor 91 can call the logical instructions in the memory 92 to execute the method for cooling the outdoor heat exchanger in the above embodiment.

[0126] In addition, when the logical instructions in the above-mentioned memory 92 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0127] The memory 92, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 91 executes functional applications and data processing by running the program instructions / modules stored in the memory 92, that is, implements the method for cooling the outdoor heat exchanger in the above embodiment.

[0128] The memory 92 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the terminal device. In addition, the memory 92 may include a high-speed random access memory and may also include a non-volatile memory.

[0129] Combined with Figure 10As shown in the figure, an embodiment of the present disclosure provides an air conditioner 100, including: an indoor unit 101, an outdoor unit 102, a spraying system, and the device 80(90) for cooling the outdoor heat exchanger as described above. The outdoor unit 102 includes an outdoor heat exchanger. The device 80(90) for cooling the outdoor heat exchanger is installed in the indoor unit 101 or the outdoor unit 102. The installation relationship described here not only includes being placed inside the indoor unit 101 or the outdoor unit 102, but also includes installation and connection with other components of the indoor unit 101 or the outdoor unit 102, including but not limited to physical connection, electrical connection, or signal transmission connection, etc. Those skilled in the art can understand that the device 80(90) for cooling the outdoor heat exchanger can be adapted to a feasible product body, thereby implementing other feasible embodiments.

[0130] The device 80(90) for cooling the outdoor heat exchanger is communicatively connected to the spraying system to control the opening or closing of the spraying system and the number of opened nozzles according to the aforementioned logic.

[0131] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the method for cooling the outdoor heat exchanger as described above.

[0132] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, etc., which are various media that can store program codes.

[0133] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, the relevant parts may refer to the description of the method part.

[0134] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0135] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0136] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for cooling an outdoor heat exchanger, characterized in that, Including: When the outdoor heat exchanger needs to be cooled down, determining the target air enthalpy value; Determining the target relative humidity of the air according to the water fee, electricity fee and the heat exchange amount of the outdoor heat exchanger; Determining the total target spray water volume according to the target air enthalpy value and the target relative humidity.

2. The method according to claim 1, characterized in that The determining of the target air enthalpy value includes: Calculating the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure of the air before humidification; Calculating the air enthalpy value before humidification according to the dry-bulb saturated water vapor pressure and the wet-bulb saturated water vapor pressure; Taking the air enthalpy value before humidification as the target air enthalpy value.

3. The method according to claim 1, wherein The determining of the target relative humidity of the air according to the water fee, electricity fee and the heat exchange amount of the outdoor heat exchanger includes: Obtaining a water fee model, an electricity fee model and a heat exchanger heat exchange amount model; According to the water fee model, the electricity fee model and the heat exchanger heat exchange amount model, obtaining the relative humidity corresponding to the minimum water fee and electricity fee and the maximum heat exchange amount of the heat exchanger; Taking the obtained relative humidity as the target relative humidity.

4. The method according to any one of claims 1 to 3, characterized in that, The determining of the total target spray water volume according to the target air enthalpy value and the target relative humidity includes: Determining the dry-bulb temperature after humidification according to the target air enthalpy value and the target relative humidity; Determining the total target spray water volume according to the dry-bulb temperature after humidification.

5. The method according to claim 4, characterized in that, The determining of the total target spray water volume according to the dry-bulb temperature after humidification includes: Determining the dry-bulb saturated water vapor pressure after humidification according to the dry-bulb temperature after humidification; Determining the total target spray water volume according to the dry-bulb saturated water vapor pressure after humidification, the target relative humidity and the atmospheric pressure.

6. The method according to any one of claims 1 to 5, characterized in that, Determining that the outdoor heat exchanger needs to be cooled down by the following method: Obtaining the outdoor environmental temperature and the exhaust temperature of the compressor; When the outdoor environmental temperature is greater than the first temperature threshold and the exhaust temperature is greater than the second temperature threshold, determining that the outdoor heat exchanger needs to be cooled down.

7. The method according to claim 6, characterized in that, After the determining of the total target spray water volume, the method further includes: Controlling the spray system to be turned on; When the spray water volume is less than the total target spray water volume, if the outdoor environmental temperature is less than or equal to the first temperature threshold, and / or the exhaust temperature is less than or equal to the second temperature threshold, obtaining the opening duration of the spray system; Controlling the operation of the spray system according to the opening duration.

8. The method according to claim 7, characterized in that, When the spray system is controlled to be turned on, the method further includes: Controlling the opening number of the nozzles of the spray system according to the outdoor environmental temperature.

9. A device for cooling an outdoor heat exchanger, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the method for cooling down the outdoor heat exchanger according to any one of claims 1 to 8 when running the program instructions.

10. An air conditioner, characterized in that, Including: An outdoor unit including an outdoor heat exchanger; A spray system for spraying water mist on the outdoor heat exchanger; The device for cooling down the outdoor heat exchanger according to claim 9, which is communicatively connected to the spray system to control the spray system to be turned on or off.

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