Air conditioning system, control method and device thereof and storage medium

Abstract

The invention discloses an air conditioning system, a control method and device of the air conditioning system and a storage medium, and the method comprises the steps that an equipment capacity model and an air return state model of an indoor unit are obtained, and a heat exchange capacity value and an air return enthalpy value boundary value of the indoor unit are obtained according to the equipment capacity model and the air return state model; the air supply volume and the air outlet state model of the indoor unit are obtained, and the air supply air enthalpy value boundary value of the indoor unit is obtained according to the heat exchange capacity value, the air return air enthalpy value boundary value and the air supply volume and air outlet state model; and according to the air supply air enthalpy value boundary value of the indoor unit, the evaporation temperature of the air conditioning system is adjusted, and the air conditioning system is controlled to conduct refrigeration according to the adjusted evaporation temperature. Therefore, the evaporation temperature of the indoor unit is dynamically adjusted based on the air supply air enthalpy value boundary value of the indoor unit, and therefore the temperature and humidity requirements of the air conditioning system are synchronously met, and the energy saving performance and comfort of the air conditioning system are both considered.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method for an air conditioning system, a computer-readable storage medium, a control device for an air conditioning system, and an air conditioning system. Background Technology

[0002] Compared to conventional air conditioning systems, multi-split air conditioning systems offer advantages such as energy savings, low operating costs, advanced control, reliable operation, good unit adaptability, and a wide range of cooling and heating temperatures. However, a challenge with this technology is that while air conditioning systems are increasingly moving towards variable evaporation temperature control, multi-split systems must consider dehumidification requirements during refrigeration operation. This necessitates that the air conditioning system, while varying the evaporation temperature, also consider temperature and humidity requirements to ensure both energy efficiency and comfort. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for an air conditioning system that can dynamically adjust the evaporation temperature of the indoor unit based on the enthalpy boundary value of the supply air, thereby simultaneously meeting the temperature and humidity requirements of the air conditioning system while taking into account both energy efficiency and comfort.

[0004] A second objective of this invention is to provide a computer-readable storage medium.

[0005] The third objective of this invention is to provide a control device for an air conditioning system.

[0006] The fourth objective of this invention is to provide an air conditioning system.

[0007] To achieve the above objectives, the first aspect of the present invention provides a control method for an air conditioning system, comprising: acquiring an indoor unit's equipment capacity model and a return air state model, and acquiring, based on the equipment capacity model and the return air state model, a heat exchange capacity value and a return air enthalpy boundary value for the indoor unit, respectively; acquiring the indoor unit's supply air volume and an outlet air state model, and acquiring, based on the heat exchange capacity value, the return air enthalpy boundary value, the supply air volume, and the outlet air state model, a supply air enthalpy boundary value for the indoor unit; adjusting the evaporation temperature of the air conditioning system based on the supply air enthalpy boundary value of the indoor unit, and controlling the air conditioning system to perform cooling based on the adjusted evaporation temperature.

[0008] According to the control method of the air conditioning system of the present invention, an indoor unit's equipment capacity model and return air state model are obtained. Based on the equipment capacity model and return air state model, the heat exchange capacity value and return air enthalpy boundary value of the indoor unit are obtained respectively. Then, the indoor unit's supply air volume and outlet air state model are obtained. Based on the heat exchange capacity value, return air enthalpy boundary value, supply air volume, and outlet air state model, the indoor unit's supply air enthalpy boundary value is obtained. Finally, based on the indoor unit's supply air enthalpy boundary value, the evaporation temperature of the air conditioning system is adjusted, and the air conditioning system is controlled to cool based on the adjusted evaporation temperature. Therefore, by dynamically adjusting the indoor unit's evaporation temperature based on the indoor unit's supply air enthalpy boundary value, the temperature and humidity requirements of the air conditioning system are simultaneously met, balancing the energy efficiency and comfort of the air conditioning system.

[0009] In addition, the control method for the air conditioning system according to the above embodiments of the present invention may also have the following additional technical features: According to an embodiment of the present invention, obtaining the heat exchange capacity value of the indoor unit includes: obtaining system operating parameters of the indoor unit, wherein the system operating parameters include indoor heat exchanger condensing pressure, indoor heat exchanger evaporating pressure, indoor heat exchanger outlet temperature, compressor return gas temperature, compressor discharge temperature, compressor discharge saturation temperature, compressor return gas saturation temperature, and compressor frequency; using the system operating parameters as input parameters of the equipment capacity model to obtain the heat exchange capacity value of the indoor unit, wherein the heat exchange capacity value is the product of the enthalpy difference between the inlet and outlet of the heat exchanger and the refrigerant flow rate of the heat exchanger.

[0010] According to an embodiment of the present invention, obtaining the return air enthalpy boundary value of the indoor unit includes: obtaining the return air parameters and comfort humidity boundary values ​​of the indoor unit, wherein the return air parameters include the return air temperature of the indoor unit under stable operating conditions, and the comfort humidity boundary values ​​include an upper limit and a lower limit of comfort humidity; using the return air temperature and the comfort humidity boundary values ​​as input parameters of the return air state model to obtain the return air enthalpy boundary value of the indoor unit, wherein the return air enthalpy boundary value includes an upper limit and a lower limit of return air enthalpy, and both the upper limit and the lower limit of return air enthalpy are the sum of the sensible heat of dry air and the latent heat of water vapor.

[0011] According to an embodiment of the present invention, obtaining the return air enthalpy boundary value of the indoor unit includes: obtaining the return air temperature and comfort humidity boundary values ​​of the indoor unit under stable operating conditions, wherein the comfort humidity boundary value includes an upper limit and a lower limit of comfort humidity; using the return air temperature and the comfort humidity boundary values ​​as input parameters of the return air state model to obtain the return air enthalpy boundary value of the indoor unit, wherein the return air enthalpy boundary value includes an upper limit and a lower limit of return air enthalpy, and both the upper limit and the lower limit of return air enthalpy are the sum of the sensible heat of dry air and the latent heat of water vapor.

[0012] According to an embodiment of the present invention, obtaining the supply air enthalpy boundary value of the indoor unit includes: obtaining the ratio of the heat exchange capacity value to the supply air volume; using the ratio and the return air enthalpy boundary value as input parameters of the supply air state model to obtain the supply air enthalpy boundary value of the indoor unit, wherein the supply air enthalpy boundary value includes an upper limit of supply air enthalpy and a lower limit of supply air enthalpy, the upper limit of supply air enthalpy is the difference between the upper limit of return air enthalpy and the ratio, and the lower limit of supply air enthalpy is the difference between the lower limit of return air enthalpy and the ratio.

[0013] According to an embodiment of the present invention, adjusting the evaporation temperature of the air conditioning system includes: obtaining a preset supply air humidity and a pipe heat transfer temperature difference of the indoor unit; obtaining a supply air temperature boundary value of the indoor unit based on the supply air enthalpy boundary value and the preset supply air humidity, wherein the supply air temperature boundary value includes an upper limit of supply air temperature and a lower limit of supply air temperature, the upper limit of supply air temperature being determined by the upper limit of supply air enthalpy and the preset supply air humidity, and the lower limit of supply air temperature being determined by the lower limit of supply air enthalpy and the preset supply air humidity; obtaining a target evaporation temperature boundary value of the air conditioning system based on the supply air temperature boundary value and the pipe heat transfer temperature difference, wherein the target evaporation temperature boundary value includes a target evaporation temperature upper limit and a target evaporation temperature lower limit, the target evaporation temperature upper limit being the difference between the upper limit of supply air temperature and the pipe heat transfer temperature difference, and the target evaporation temperature lower limit being the difference between the lower limit of supply air temperature and the pipe heat transfer temperature difference; and adjusting the evaporation temperature of the air conditioning system based on the target evaporation temperature boundary value.

[0014] According to one embodiment of the present invention, adjusting the evaporation temperature of the air conditioning system includes: increasing the evaporation temperature if the evaporation temperature is lower than the target lower limit of the evaporation temperature; and decreasing the evaporation temperature if the evaporation temperature is higher than the target upper limit of the evaporation temperature.

[0015] According to one embodiment of the present invention, adjusting the evaporation temperature of the air conditioning system includes: if the evaporation temperature is greater than the lower limit of the target evaporation temperature and less than the upper limit of the target evaporation temperature, then maintaining the current evaporation temperature.

[0016] To achieve the above objectives, a computer-readable storage medium is provided in the second aspect of the present invention, on which a control program for an air conditioning system is stored. When the control program for the air conditioning system is executed by a processor, it implements the control method for the air conditioning system described in the embodiments of the present invention.

[0017] According to embodiments of the present invention, a computer-readable storage medium can dynamically adjust the evaporation temperature of an indoor unit based on the enthalpy boundary value of the supply air of the indoor unit by executing a control program of an air conditioning system stored thereon, thereby simultaneously meeting the temperature and humidity requirements of the air conditioning system and taking into account both the energy efficiency and comfort of the air conditioning system.

[0018] To achieve the above objectives, the control device for an air conditioning system proposed in the third aspect embodiment of the present invention includes: a first acquisition module, configured to acquire an indoor unit's equipment capacity model and a return air state model, and acquire, based on the equipment capacity model and the return air state model, the heat exchange capacity value and the return air enthalpy boundary value of the indoor unit, respectively; a second acquisition module, configured to acquire the indoor unit's supply air volume and outlet air state model, and acquire, based on the heat exchange capacity value, the return air enthalpy boundary value, the supply air volume, and the outlet air state model, the supply air enthalpy boundary value of the indoor unit; and a control module, configured to adjust the evaporation temperature of the air conditioning system based on the supply air enthalpy boundary value of the indoor unit, and control the air conditioning system to perform cooling based on the adjusted evaporation temperature.

[0019] According to an embodiment of the present invention, the control device of the air conditioning system acquires the equipment capacity model and return air state model of the indoor unit through a first acquisition module, and acquires the heat exchange capacity value and return air enthalpy boundary value of the indoor unit based on the equipment capacity model and return air state model, respectively. Then, the control module acquires the supply air volume and outlet air state model of the indoor unit, and acquires the supply air enthalpy boundary value of the indoor unit based on the heat exchange capacity value, return air enthalpy boundary value, supply air volume, and outlet air state model. Finally, the control module adjusts the evaporation temperature of the air conditioning system based on the supply air enthalpy boundary value of the indoor unit, and controls the air conditioning system to cool based on the adjusted evaporation temperature. Thus, by dynamically adjusting the evaporation temperature of the indoor unit based on the supply air enthalpy boundary value of the indoor unit, the temperature and humidity requirements of the air conditioning system are simultaneously met, balancing the energy efficiency and comfort of the air conditioning system.

[0020] To achieve the above objectives, the air conditioning system proposed in the fourth aspect of the present invention includes the control device of the air conditioning system of the above-described embodiments of the present invention.

[0021] According to the air conditioning system of the present invention, by adopting the aforementioned control device for the air conditioning system, the evaporation temperature of the indoor unit can be dynamically adjusted based on the enthalpy boundary value of the supply air of the indoor unit, thereby simultaneously meeting the temperature and humidity requirements of the air conditioning system and taking into account both the energy efficiency and comfort of the air conditioning system.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the control method of an air conditioning system according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating a control method for an air conditioning system according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating a control method for an air conditioning system according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating a control method for an air conditioning system according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating a control method for an air conditioning system according to an embodiment of the present invention; Figure 6 This is a flowchart illustrating a control method for an air conditioning system according to an embodiment of the present invention; Figure 7 This is a block diagram of the control device of an air conditioning system according to an embodiment of the present invention; Figure 8 This is a block diagram of an air conditioning system according to an embodiment of the present invention. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following description, with reference to the accompanying drawings, describes an air conditioning system control method, a computer-readable storage medium, an air conditioning system control device, and an air conditioning system according to embodiments of the present invention.

[0026] It should be noted that in some embodiments of the present invention, the air conditioning system can be a conventional air conditioning system or a multi-split air conditioning system.

[0027] Figure 1 This is a flowchart illustrating the control method of an air conditioning system according to an embodiment of the present invention.

[0028] Specifically, in some embodiments of the present invention, such as Figure 1 As shown, the control method for the air conditioning system includes: S101, obtain the equipment capacity model and return air state model of the indoor unit, and obtain the heat exchange capacity value and return air enthalpy boundary value of the indoor unit according to the equipment capacity model and return air state model respectively.

[0029] It is understood that in this embodiment of the present invention, the heat exchange capacity value of the indoor unit is calculated by combining the equipment capacity model with the system operating parameters of the indoor unit, and the return air enthalpy boundary value of the indoor unit is calculated by combining the return air parameters and the comfort humidity boundary value of the indoor unit with the return air state model.

[0030] S102, obtain the air supply volume and air outlet state model of the indoor unit, and obtain the air supply enthalpy boundary value of the indoor unit based on the heat exchange capacity value, return air enthalpy boundary value, air supply volume and air outlet state model.

[0031] It is understood that, in this embodiment of the present invention, the enthalpy boundary value of the indoor unit's supply air is calculated by combining the heat exchange capacity value of the indoor unit, the enthalpy boundary value of the return air, and the supply air volume with the air outlet state model.

[0032] S103 adjusts the evaporation temperature of the air conditioning system according to the boundary value of the enthalpy of the air supplied by the indoor unit, and controls the air conditioning system to cool according to the adjusted evaporation temperature.

[0033] It is understandable that, compared to the existing technology that dynamically adjusts the evaporation temperature based solely on the supply air temperature, in this embodiment of the present invention, the evaporation temperature of the indoor unit is dynamically adjusted based on the enthalpy boundary value of the supply air of the indoor unit, which can simultaneously meet the temperature and humidity requirements of the air conditioning system, taking into account both the energy efficiency and comfort of the air conditioning system.

[0034] Furthermore, in some embodiments of the present invention, such as Figure 2 As shown, the heat exchange capacity value of the indoor unit is obtained, including: S201, obtain the system operating parameters of the indoor unit, including the indoor heat exchanger condensing pressure, indoor heat exchanger evaporating pressure, indoor heat exchanger outlet temperature, compressor return gas temperature, compressor discharge temperature, compressor discharge pressure, compressor return gas pressure, and compressor frequency.

[0035] It is understood that, in this embodiment of the present invention, the indoor heat exchanger condensing pressure Pc, indoor heat exchanger evaporating pressure Pe, indoor heat exchanger outlet temperature T3L, compressor return gas temperature Th, compressor discharge temperature T5, compressor discharge saturation temperature Tc, compressor return gas saturation temperature Te, and compressor frequency Fxn are obtained by temperature sensors or pressure sensors arranged at corresponding positions of the indoor unit.

[0036] S202 uses the system operating parameters as input parameters for the equipment capacity model to obtain the heat exchange capacity value of the indoor unit. The heat exchange capacity value is the product of the enthalpy difference between the inlet and outlet of the heat exchanger and the refrigerant flow rate of the heat exchanger.

[0037] It is understood that, in this embodiment of the present invention, the heat exchange capacity value Q of the indoor unit, i.e. the cooling capacity of the indoor unit, is calculated by multiplying the enthalpy difference between the inlet and outlet of the heat exchanger by the refrigerant flow rate of the heat exchanger.

[0038] The following explains the calculation process for heat exchange capacity values ​​based on the enthalpy difference between the inlet and outlet of the heat exchanger and the refrigerant flow rate of the heat exchanger. enthalpy difference between heat exchanger inlet and outlet It can be calculated in the following way: In cooling mode, the indoor heat exchanger is an evaporator, meaning the enthalpy difference between the inlet and outlet of the heat exchanger... Let t be the enthalpy difference between the inlet and outlet of the evaporator. At this point, it is assumed that the enthalpy of the refrigerant remains constant during the expansion process. Therefore, the enthalpy at the inlet of the evaporator is equal to the enthalpy at the outlet of the outdoor heat exchanger (i.e., the condenser). Given the type of refrigerant and that the refrigerant is in a subcooled state, the enthalpy at the outlet of the condenser (i.e., the enthalpy at the inlet of the heat exchanger) can be calculated based on the condensing pressure Pc and the outlet temperature T3L of the indoor heat exchanger. Meanwhile, the outlet of the evaporator is in a superheated state. The enthalpy at the outlet of the evaporator (i.e., the enthalpy at the outlet of the heat exchanger) can be calculated based on the return gas temperature Th (or return gas superheat SH) and the evaporating pressure Pe of the indoor heat exchanger. Thus, the enthalpy difference between the inlet and outlet of the evaporator can be calculated.

[0039] Furthermore, the refrigerant flow rate of the heat exchanger can be calculated in the following way: The refrigerant flow rate of the heat exchanger can be expressed as a function of the compressor discharge saturation temperature Tc and the compressor return gas saturation temperature Te. For example: the refrigerant flow rate Gr_comp = (A1 + A2 * Te + A3 * Tc + A4 * Te^2 + A5 * Te * Tc + A6 * Tc^2) * k, or Gr_comp = (A1 + A2 * Te + A3 * Tc + A4 * Te^2 + A5 * Te * Tc + A6 * Tc^2 + A7 * Te^3 + A8 * Te^2 * Tc + A9 * Te * Tc^2 + A10 * Tc^3) * k, where A1 to A10 are coefficients, with different coefficients corresponding to different compressor frequencies, and k is a function that corrects the compressor return gas temperature to be related to the return gas temperature. The higher the return gas temperature, the smaller k is.

[0040] Therefore, by controlling the enthalpy difference between the inlet and outlet of the heat exchanger and refrigerant flow rate of heat exchanger As a device capability model By inputting the parameters, the heat exchange capacity of the indoor unit can be calculated. .

[0041] Furthermore, in some embodiments of the present invention, such as Figure 3 As shown, the boundary values ​​for obtaining the return air enthalpy of the indoor unit include: S301, obtain the return air parameters and comfort humidity boundary values ​​of the indoor unit. The return air parameters include the return air temperature of the indoor unit under stable operating conditions, and the comfort humidity boundary values ​​include the upper limit and lower limit of comfort humidity.

[0042] It is understood that in this embodiment of the present invention, the return air temperature T1 of the indoor unit under stable operating conditions is obtained by a temperature sensor set at the return air vent of the indoor unit, and the comfort humidity boundary values ​​[RHmin, RHmax] are obtained by looking up the national or international standards for human comfort, where RHmin is the lower limit of comfort humidity and RHmax is the upper limit of comfort humidity.

[0043] S302 uses the return air temperature and comfort humidity boundary values ​​as input parameters for the return air state model to obtain the return air enthalpy boundary values ​​of the indoor unit. The return air enthalpy boundary values ​​include the upper limit and lower limit of the return air enthalpy value, both of which are the sum of the sensible heat of dry air and the latent heat of water vapor.

[0044] It is understood that, in this embodiment of the present invention, the return air state model is as follows:

[0045]

[0046] ; in, This refers to the enthalpy value of the return air. The sensible heat of dry air. T1 is the latent heat of water vapor, T2 is the return air temperature, and RH is the humidity value. This represents the humidity level (RH) of the air.

[0047] Specifically, in the above embodiments of the present invention, the return air temperature T1 and the upper limit of comfort humidity RHmax are used as the return air state model. The input parameters, combined with the above formula, can be used to calculate the upper limit of the return air enthalpy, Hinmax. Similarly, by using the return air temperature T1 and the lower limit of comfort humidity RHmin as the return air state model, The input parameters, combined with the above formula, can be used to calculate the lower limit of the return air enthalpy, Hinmin.

[0048] Furthermore, in some embodiments of the present invention, such as Figure 4 As shown, the boundary values ​​for obtaining the enthalpy of the indoor unit's supply air are included: S401, obtain the ratio of heat exchange capacity to air volume.

[0049] It is understood that, in this embodiment of the present invention, the ratio of heat exchange capacity to air volume is used to characterize the heat exchanged per unit volume of air when it flows through the heat exchange device.

[0050] S402, using the ratio and return air enthalpy boundary value as input parameters of the supply air state model, obtains the supply air enthalpy boundary value of the indoor unit. The supply air enthalpy boundary value includes the upper limit and lower limit of the supply air enthalpy value. The upper limit of the supply air enthalpy value is the difference between the upper limit of the return air enthalpy value and the ratio, and the lower limit of the supply air enthalpy value is the difference between the lower limit of the return air enthalpy value and the ratio.

[0051] It is understood that, in this embodiment of the present invention, the air supply state model is as follows: ; in, The enthalpy value of the supply air. This refers to the enthalpy value of the return air. This is the heat exchange capacity value. This refers to the air supply volume.

[0052] Specifically, in this embodiment of the invention, the heat transfer capacity value is... upper limit of return air enthalpy (Hinmax) and supply air volume As input parameters for the supply air state model, the upper limit of the supply air enthalpy, Houtmax = Hinmax - Q / ma, can be calculated using the above formula. Similarly, the heat transfer capacity value can be used as the input parameter. Lower limit of return air enthalpy (Hinmin) and supply air volume As input parameters for the air supply state model, the lower limit of the air supply enthalpy, Houtmin = Hinmin - Q / ma, can be calculated using the above formula.

[0053] Optionally, different fan speeds correspond to different air volumes. By obtaining the fan speed setting of the indoor unit, the air volume delivered by the indoor unit can be determined. .

[0054] Furthermore, in some embodiments of the present invention, such as Figure 5 As shown, adjusting the evaporator temperature of the air conditioning system includes: S501 obtains the preset air supply humidity and duct heat transfer temperature difference of the indoor unit.

[0055] It is understood that in this embodiment of the present invention, the preset air supply humidity can be 95%, and the pipe heat transfer temperature difference X℃ can be obtained by querying the indoor unit pipe diameter configuration.

[0056] S502, based on the supply air enthalpy boundary value and the preset supply air humidity, obtain the supply air temperature boundary value of the indoor unit. The supply air temperature boundary value includes the upper limit of the supply air temperature and the lower limit of the supply air temperature. The upper limit of the supply air temperature is determined by the upper limit of the supply air enthalpy value and the preset supply air humidity, and the lower limit of the supply air temperature is determined by the lower limit of the supply air enthalpy value and the preset supply air humidity.

[0057] It is understood that, in this embodiment of the present invention, the enthalpy-humidity diagram relationship Tsupply= The supply air temperature Tsupply of the indoor unit is calculated. Specifically, the upper limit of the supply air temperature Tsupplymax can be calculated based on the upper limit of the supply air enthalpy Houtmax and the preset supply air humidity of 95% combined with the enthalpy-humidity diagram. Similarly, the lower limit of the supply air temperature Tsupplymin can be calculated based on the lower limit of the supply air enthalpy Houtmin and the preset supply air humidity of 95% combined with the enthalpy-humidity diagram.

[0058] S503, based on the supply air temperature boundary value and the pipeline heat transfer temperature difference, obtain the target evaporation temperature boundary value of the air conditioning system. The target evaporation temperature boundary value includes the upper limit of the target evaporation temperature and the lower limit of the target evaporation temperature. The upper limit of the target evaporation temperature is the difference between the upper limit of the supply air temperature and the pipeline heat transfer temperature difference, and the lower limit of the target evaporation temperature is the difference between the lower limit of the supply air temperature and the pipeline heat transfer temperature difference.

[0059] It is understood that, in this embodiment of the present invention, the target evaporation temperature can be obtained using the following formula: Tes = Tsupply - X; Where Tes is the target evaporation temperature, Tsupply is the supply air temperature, and X is the heat transfer temperature difference in the pipeline.

[0060] Specifically, in the above embodiments of the present invention, based on the upper limit of the supply air temperature Tsupplymax and the pipe heat transfer temperature difference X, the target evaporation temperature upper limit Tesmax corresponding to the upper limit of the comfortable humidity RHmax can be obtained by combining the above formula. Similarly, based on the lower limit of the supply air temperature Tsupplymin and the pipe heat transfer temperature difference X, the target evaporation temperature lower limit Tesmin corresponding to the lower limit of the comfortable humidity RHmin can be obtained by combining the above formula.

[0061] S504, adjusts the evaporation temperature of the air conditioning system according to the target evaporation temperature boundary value.

[0062] It is understood that, in this embodiment of the present invention, the upper limit of the target evaporation temperature Tesmax and the lower limit of the target evaporation temperature Tesmin are used as the boundaries of the evaporation temperature Te of the air conditioning system, so as to adjust the evaporation temperature Te of the air conditioning system.

[0063] Furthermore, in some embodiments of the present invention, such as Figure 6 As shown, adjusting the evaporator temperature of the air conditioning system includes: S601, if the evaporation temperature is lower than the lower limit of the target evaporation temperature, then increase the evaporation temperature.

[0064] It is understood that in this embodiment of the present invention, when the evaporation temperature is lower than the lower limit of the target evaporation temperature, the air conditioning system is considered to be over-throttling. At this time, by increasing the evaporation temperature, the air conditioning system can achieve the highest energy efficiency and ensure the safe and long-term operation of the equipment while meeting the cooling demand.

[0065] S602, if the evaporation temperature is higher than the upper limit of the target evaporation temperature, then reduce the evaporation temperature.

[0066] It is understood that in this embodiment of the present invention, when the evaporation temperature is greater than the upper limit of the target evaporation temperature, the air conditioning system is considered to be insufficient in throttling. At this time, by reducing the evaporation temperature, the air conditioning system can achieve the highest energy efficiency and ensure the safe and long-term operation of the equipment while meeting the cooling demand.

[0067] Furthermore, in some embodiments of the present invention, such as Figure 6 As shown, adjusting the evaporator temperature of the air conditioning system includes: S603: If the evaporation temperature is greater than the lower limit of the target evaporation temperature but less than the upper limit of the target evaporation temperature, then maintain the current evaporation temperature.

[0068] It is understood that in this embodiment of the present invention, when the evaporation temperature is greater than the lower limit of the target evaporation temperature and less than the upper limit of the target evaporation temperature, the air conditioning system can be considered to be in the optimal state. At this time, the current evaporation temperature is maintained, thereby achieving the highest energy efficiency and ensuring the safe and long-term operation of the equipment.

[0069] In summary, the air conditioning system control method according to embodiments of the present invention obtains the equipment capacity model and return air state model of the indoor unit, and obtains the heat exchange capacity value and return air enthalpy boundary value of the indoor unit based on the equipment capacity model and return air state model, respectively. Then, it obtains the supply air volume and outlet air state model of the indoor unit, and obtains the supply air enthalpy boundary value of the indoor unit based on the heat exchange capacity value, return air enthalpy boundary value, supply air volume, and outlet air state model. Finally, it adjusts the evaporation temperature of the air conditioning system based on the supply air enthalpy boundary value of the indoor unit, and controls the air conditioning system to cool based on the adjusted evaporation temperature. Therefore, by dynamically adjusting the evaporation temperature of the indoor unit based on the supply air enthalpy boundary value of the indoor unit, the temperature and humidity requirements of the air conditioning system are simultaneously met, balancing the energy efficiency and comfort of the air conditioning system.

[0070] Based on the control method of the air conditioning system in the foregoing embodiments of the present invention, the computer-readable storage medium proposed in the embodiments of the present invention stores a control program for the air conditioning system thereon. When the control program for the air conditioning system is executed by a processor, it implements the control method of the air conditioning system in the foregoing embodiments of the present invention.

[0071] It should be understood that the specific implementation of the computer-readable storage medium in the embodiments of the present invention can be found in the specific implementation of the control method of the air conditioning system in the foregoing embodiments of the present invention, and will not be repeated here to reduce redundancy.

[0072] In summary, according to embodiments of the present invention, a computer-readable storage medium, by executing a control program for an air conditioning system stored thereon, can dynamically adjust the evaporation temperature of the indoor unit based on the enthalpy boundary value of the supply air of the indoor unit, thereby simultaneously meeting the temperature and humidity requirements of the air conditioning system while taking into account both energy efficiency and comfort.

[0073] Figure 7 This is a block diagram of the control device of an air conditioning system according to an embodiment of the present invention.

[0074] Specifically, in some embodiments of the present invention, such as Figure 7 As shown, the control device 100 of the air conditioning system includes: a first acquisition module 10, a second acquisition module 20, and a control module 30.

[0075] The first acquisition module 10 is used to acquire the equipment capacity model and return air state model of the indoor unit, and acquire the heat exchange capacity value and return air enthalpy boundary value of the indoor unit according to the equipment capacity model and return air state model, respectively; the second acquisition module 20 is used to acquire the air supply volume and air outlet state model of the indoor unit, and acquire the air supply enthalpy boundary value of the indoor unit according to the heat exchange capacity value, return air enthalpy boundary value, air supply volume and air outlet state model; the control module 30 is used to adjust the evaporation temperature of the air conditioning system according to the air supply enthalpy boundary value of the indoor unit, and control the air conditioning system to cool according to the adjusted evaporation temperature.

[0076] Furthermore, in some embodiments of the present invention, the first acquisition module 10 is further configured to acquire the system operating parameters of the indoor unit, wherein the system operating parameters include the condensing pressure of the indoor heat exchanger, the evaporating pressure of the indoor heat exchanger, the outlet temperature of the indoor heat exchanger, the return gas temperature of the compressor, the discharge temperature of the compressor, the discharge saturation temperature of the compressor, the return gas saturation temperature of the compressor, and the compressor frequency; and use the system operating parameters as input parameters of the equipment capacity model to acquire the heat exchange capacity value of the indoor unit, wherein the heat exchange capacity value is the product of the enthalpy difference between the inlet and outlet of the heat exchanger and the refrigerant flow rate of the heat exchanger.

[0077] Furthermore, in some embodiments of the present invention, the first acquisition module 10 is further configured to acquire the return air parameters and comfort humidity boundary values ​​of the indoor unit, wherein the return air parameters include the return air temperature of the indoor unit under stable operating conditions, and the comfort humidity boundary values ​​include the upper limit and lower limit of comfort humidity; and to acquire the return air enthalpy boundary values ​​of the indoor unit by using the return air temperature and comfort humidity boundary values ​​as input parameters of the return air state model, wherein the return air enthalpy boundary values ​​include the upper limit and lower limit of return air enthalpy, and both the upper limit and lower limit of return air enthalpy are the sum of the sensible heat of dry air and the latent heat of water vapor.

[0078] Furthermore, in some embodiments of the present invention, the second acquisition module 20 is further configured to acquire the ratio of heat exchange capacity to air supply volume; use the ratio and return air enthalpy boundary value as input parameters of the air supply state model to acquire the air supply enthalpy boundary value of the indoor unit, wherein the air supply enthalpy boundary value includes an upper limit of air supply enthalpy and a lower limit of air supply enthalpy, the upper limit of air supply enthalpy is the difference between the upper limit of return air enthalpy and the ratio, and the lower limit of air supply enthalpy is the difference between the lower limit of return air enthalpy and the ratio.

[0079] Furthermore, in some embodiments of the present invention, the control module 30 is further configured to: acquire the preset supply air humidity and pipe heat transfer temperature difference of the indoor unit; acquire the supply air temperature boundary value of the indoor unit based on the supply air enthalpy boundary value and the preset supply air humidity, wherein the supply air temperature boundary value includes an upper limit of supply air temperature and a lower limit of supply air temperature, the upper limit of supply air temperature being determined by the upper limit of supply air enthalpy and the preset supply air humidity, and the lower limit of supply air temperature being determined by the lower limit of supply air enthalpy and the preset supply air humidity; acquire the target evaporation temperature boundary value of the air conditioning system based on the supply air temperature boundary value and the pipe heat transfer temperature difference, wherein the target evaporation temperature boundary value includes an upper limit of target evaporation temperature and a lower limit of target evaporation temperature, the upper limit of target evaporation temperature being the difference between the upper limit of supply air temperature and the pipe heat transfer temperature difference, and the lower limit of target evaporation temperature being the difference between the lower limit of supply air temperature and the pipe heat transfer temperature difference; and adjust the evaporation temperature of the air conditioning system based on the target evaporation temperature boundary value.

[0080] Furthermore, in some embodiments of the present invention, adjusting the evaporation temperature of the air conditioning system includes: increasing the evaporation temperature if the evaporation temperature is lower than the lower limit of the target evaporation temperature; and decreasing the evaporation temperature if the evaporation temperature is higher than the upper limit of the target evaporation temperature.

[0081] Furthermore, in some embodiments of the present invention, adjusting the evaporation temperature of the air conditioning system includes: if the evaporation temperature is greater than the lower limit of the target evaporation temperature and less than the upper limit of the target evaporation temperature, then maintaining the current evaporation temperature.

[0082] It should be understood that the specific implementation of the control device 100 of the air conditioning system in this embodiment of the invention corresponds one-to-one with the specific implementation of the control method of the air conditioning system in the aforementioned embodiment of the invention. To reduce redundancy, it will not be described again here.

[0083] In summary, the control device for the air conditioning system according to embodiments of the present invention acquires the equipment capacity model and return air state model of the indoor unit through a first acquisition module, and acquires the heat exchange capacity value and return air enthalpy boundary value of the indoor unit based on the equipment capacity model and return air state model, respectively. Then, it acquires the supply air volume and outlet air state model of the indoor unit through a second acquisition module, and acquires the supply air enthalpy boundary value of the indoor unit based on the heat exchange capacity value, return air enthalpy boundary value, supply air volume, and outlet air state model. Finally, the control module adjusts the evaporation temperature of the air conditioning system based on the supply air enthalpy boundary value of the indoor unit, and controls the air conditioning system to cool based on the adjusted evaporation temperature. Therefore, by dynamically adjusting the evaporation temperature of the indoor unit based on the supply air enthalpy boundary value of the indoor unit, the temperature and humidity requirements of the air conditioning system are simultaneously met, balancing the energy efficiency and comfort of the air conditioning system.

[0084] Figure 8 This is a block diagram of an air conditioning system according to an embodiment of the present invention.

[0085] Specifically, in some embodiments of the present invention, such as Figure 8 As shown, the air conditioning system 1000 includes the control device 100 of the air conditioning system described in the above embodiment of the present invention.

[0086] It should be understood that the specific implementation of the air conditioning system 1000 in the embodiments of the present invention can refer to the specific implementation of the control method of the air conditioning system in the foregoing embodiments of the present invention. To reduce redundancy, it will not be described again here.

[0087] In summary, the air conditioning system according to the embodiments of the present invention, by employing the aforementioned control device for the air conditioning system, can dynamically adjust the evaporation temperature of the indoor unit based on the boundary value of the enthalpy of the supply air of the indoor unit, thereby simultaneously meeting the temperature and humidity requirements of the air conditioning system and taking into account both the energy efficiency and comfort of the air conditioning system.

[0088] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0089] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0090] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. 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.

[0091] In the description of this invention, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0092] 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In this invention, unless otherwise explicitly 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," "over," and "on top" of 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.

[0095] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The method includes: Obtain the equipment capacity model and return air state model of the indoor unit, and obtain the heat exchange capacity value and return air enthalpy boundary value of the indoor unit based on the equipment capacity model and the return air state model, respectively. Obtain the air supply volume and air outlet state model of the indoor unit, and obtain the air supply enthalpy boundary value of the indoor unit based on the heat exchange capacity value, the return air enthalpy boundary value, the air supply volume and the air outlet state model. The evaporation temperature of the air conditioning system is adjusted according to the enthalpy boundary value of the supply air of the indoor unit, and the air conditioning system is controlled to cool according to the adjusted evaporation temperature.

2. The control method for the air conditioning system according to claim 1, characterized in that, The process of obtaining the heat exchange capacity value of the indoor unit includes: The system operating parameters of the indoor unit are obtained, including the indoor heat exchanger condensing pressure, indoor heat exchanger evaporating pressure, indoor heat exchanger outlet temperature, compressor return gas temperature, compressor discharge temperature, compressor discharge saturation temperature, compressor return gas saturation temperature, and compressor frequency. The system operating parameters are used as input parameters for the equipment capacity model to obtain the heat exchange capacity value of the indoor unit, wherein the heat exchange capacity value is the product of the enthalpy difference between the inlet and outlet of the heat exchanger and the refrigerant flow rate of the heat exchanger.

3. The control method for the air conditioning system according to claim 1, characterized in that, The step of obtaining the boundary value of the return air enthalpy of the indoor unit includes: Obtain the return air parameters and comfort humidity boundary values ​​of the indoor unit, wherein the return air parameters include the return air temperature of the indoor unit under stable operating conditions, and the comfort humidity boundary values ​​include the upper limit and lower limit of comfort humidity. Using the return air temperature and the comfort humidity boundary values ​​as input parameters of the return air state model, the return air enthalpy boundary values ​​of the indoor unit are obtained. The return air enthalpy boundary values ​​include an upper limit and a lower limit, both of which are the sum of the sensible heat of dry air and the latent heat of water vapor.

4. The control method for the air conditioning system according to claim 3, characterized in that, The step of obtaining the boundary value of the supply air enthalpy of the indoor unit includes: Obtain the ratio of the heat exchange capacity value to the air supply volume; Using the ratio and the return air enthalpy boundary value as input parameters of the air supply state model, the air supply enthalpy boundary value of the indoor unit is obtained. The air supply enthalpy boundary value includes an upper limit and a lower limit of the air supply enthalpy. The upper limit of the air supply enthalpy is the difference between the upper limit of the return air enthalpy and the ratio, and the lower limit of the air supply enthalpy is the difference between the lower limit of the return air enthalpy and the ratio.

5. The control method for the air conditioning system according to claim 4, characterized in that, The adjustment of the evaporation temperature of the air conditioning system includes: The preset air supply humidity and pipe heat transfer temperature difference of the indoor unit are obtained; The supply air temperature boundary value of the indoor unit is obtained based on the supply air enthalpy boundary value and the preset supply air humidity. The supply air temperature boundary value includes an upper limit of supply air temperature and a lower limit of supply air temperature. The upper limit of supply air temperature is determined by the upper limit of supply air enthalpy value and the preset supply air humidity. The lower limit of supply air temperature is determined by the lower limit of supply air enthalpy value and the preset supply air humidity. Based on the supply air temperature boundary value and the pipeline heat transfer temperature difference, the target evaporation temperature boundary value of the air conditioning system is obtained, wherein the target evaporation temperature boundary value includes an upper limit of the target evaporation temperature and a lower limit of the target evaporation temperature. The upper limit of the target evaporation temperature is the difference between the upper limit of the supply air temperature and the pipeline heat transfer temperature difference, and the lower limit of the target evaporation temperature is the difference between the lower limit of the supply air temperature and the pipeline heat transfer temperature difference. The evaporation temperature of the air conditioning system is adjusted according to the target evaporation temperature boundary value.

6. The control method for an air conditioning system according to claim 5, characterized in that, The adjustment of the evaporation temperature of the air conditioning system includes: If the evaporation temperature is lower than the lower limit of the target evaporation temperature, then the evaporation temperature is increased; If the evaporation temperature is greater than the upper limit of the target evaporation temperature, then the evaporation temperature is reduced.

7. The control method for an air conditioning system according to claim 6, characterized in that, The adjustment of the evaporation temperature of the air conditioning system includes: If the evaporation temperature is greater than the lower limit of the target evaporation temperature but less than the upper limit of the target evaporation temperature, then the current evaporation temperature is maintained.

8. A computer-readable storage medium, characterized in that, It stores the control program of the air conditioning system, which, when executed by the processor, implements the control method of the air conditioning system as described in any one of claims 1-7.

9. A control device for an air conditioning system, characterized in that, The device includes: The first acquisition module is used to acquire the equipment capacity model and return air state model of the indoor unit, and to acquire the heat exchange capacity value and return air enthalpy boundary value of the indoor unit according to the equipment capacity model and the return air state model, respectively. The second acquisition module is used to acquire the air supply volume and air outlet state model of the indoor unit, and to acquire the air supply enthalpy boundary value of the indoor unit based on the heat exchange capacity value, the return air enthalpy boundary value, the air supply volume and the air outlet state model. The control module is used to adjust the evaporation temperature of the air conditioning system according to the enthalpy boundary value of the supply air of the indoor unit, and to control the air conditioning system to cool according to the adjusted evaporation temperature.

10. An air conditioning system, characterized in that, The air conditioning system includes the control device for the air conditioning system as described in claim 9.

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