Air conditioner

Abstract

According to the air conditioner, the outdoor environment temperature and the indoor unit return air temperature are obtained, the indoor unit sensible heat load is determined according to the outdoor environment temperature and the indoor unit return air temperature, and the indoor unit outlet air temperature is determined according to the indoor unit sensible heat load, the indoor unit air volume and the indoor unit return air temperature. The determined air outlet temperature of the indoor unit serves as the target temperature; and controlling the running state of the air conditioner according to the target temperature. Therefore, the air conditioner can predict the air outlet temperature meeting the indoor load requirement according to the indoor and outdoor environment temperature and the air volume of the indoor unit, and energy is saved to the maximum extent while the comfortable temperature of a user is met.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and in particular to an air conditioner that does not require manual temperature setting. Background Technology

[0002] Current air conditioners require users to manually set the temperature, which is then used as the target temperature for control and adjustment. However, user-set temperatures are arbitrary, and users often lack experience and set them based on their own understanding. This can lead to situations where the air conditioner's capacity is insufficient to meet indoor load demands and thus fails to achieve the user's desired temperature, or it may exceed the indoor load demands and thus exceed the user's desired temperature. This not only results in poor user comfort but also causes energy waste.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0004] This invention proposes an air conditioner that solves the technical problem that existing air conditioners require users to set the temperature, resulting in insufficient air conditioning capacity to meet indoor load demands and thus failing to meet user temperature requirements, or the air conditioning capacity exceeding indoor load demands and user temperature requirements, leading to poor user comfort and energy waste.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0006] An air conditioner, comprising:

[0007] Outdoor ambient temperature detection module, used to detect outdoor ambient temperature;

[0008] The indoor unit return air temperature detection module is used to detect the return air temperature of the indoor unit.

[0009] The air conditioner also includes:

[0010] Indoor unit air volume acquisition module, used to acquire indoor unit air volume;

[0011] The control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature.

[0012] The control module is configured to determine the indoor unit outlet temperature based on the indoor unit sensible heat load, the indoor unit air volume, and the indoor unit return air temperature, and to use the determined indoor unit outlet temperature as the target temperature.

[0013] The control module is configured to control the operating status of the air conditioner according to the target temperature.

[0014] The above technical solution has the following advantages or beneficial effects: the air conditioner obtains the outdoor ambient temperature and the indoor unit return air temperature, determines the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature, determines the indoor unit outlet air temperature based on the indoor unit sensible heat load, the indoor unit air volume, and the indoor unit return air temperature, and uses the determined indoor unit outlet air temperature as the target temperature; the air conditioner's operating status is controlled according to the target temperature. Therefore, the air conditioner can predict the outlet air temperature that meets the indoor load requirements based on the indoor and outdoor ambient temperatures and the indoor unit air volume, so as to maximize energy saving while meeting the user's comfort temperature.

[0015] In some embodiments, the control module is configured to control the operating status of the air conditioner based on the target temperature and the indoor unit return air temperature.

[0016] The above technical solution has the following advantages or beneficial effects: it eliminates the need to add an indoor unit outlet air temperature detection module, and uses the indoor unit return air temperature to control the air conditioner, which can save costs.

[0017] In some embodiments, the air conditioner includes:

[0018] The indoor unit outlet air temperature detection module is used to detect the outlet air temperature of the indoor unit.

[0019] The control module is configured to control the operating status of the air conditioner based on the target temperature and the indoor unit's outlet air temperature.

[0020] The above technical solution has the following advantages or beneficial effects: the control module controls the operation of the air conditioner to adjust the actual air outlet temperature of the indoor unit to the target temperature, thereby maximizing energy saving while meeting the user's comfort temperature.

[0021] In some embodiments, when the air conditioner is operating in cooling mode, the indoor unit outlet air temperature is the sum of the quotient of the indoor unit sensible heat load and the indoor unit air volume and the indoor unit return air temperature.

[0022] The above technical solution has the following advantages or beneficial effects: the indoor unit outlet air temperature in cooling mode is calculated by the sum of the quotient of the indoor unit sensible heat load and the indoor unit air volume and the indoor unit return air temperature. This indoor unit outlet air temperature can quickly meet the indoor load requirements of cooling mode without overloading, thus saving energy.

[0023] In some embodiments, when the air conditioner is operating in heating mode, the indoor unit outlet air temperature is the difference between the quotient of the indoor unit sensible heat load and the indoor unit air volume and the indoor unit return air temperature.

[0024] The above technical solution has the following advantages or beneficial effects: the indoor unit outlet air temperature in heating mode is calculated by the difference between the quotient of the indoor unit sensible heat load and the indoor unit air volume and the indoor unit return air temperature. This indoor unit outlet air temperature can quickly meet the indoor load requirements of the heating mode without overload adjustment, thus saving energy.

[0025] In some embodiments, the air conditioner includes:

[0026] The indoor unit return air dry bulb temperature acquisition module is used to acquire the indoor unit return air dry bulb temperature.

[0027] The indoor unit return air wet-bulb temperature acquisition module is used to acquire the indoor unit return air wet-bulb temperature.

[0028] When the air conditioner is running in cooling mode, the control module has the initial value of the indoor unit's outlet wet bulb temperature;

[0029] The control module is configured to determine the enthalpy of the indoor unit return air and the absolute humidity of the indoor unit return air based on the dry-bulb temperature of the indoor unit return air, the wet-bulb temperature of the indoor unit return air and atmospheric pressure; and to determine the enthalpy of the indoor unit outlet air based on the outlet air temperature of the indoor unit, the wet-bulb temperature of the indoor unit outlet air and atmospheric pressure.

[0030] The configuration is to determine the total heat treatment capacity of the indoor unit based on the difference between the indoor unit's outlet air enthalpy and the indoor unit's return air enthalpy and the indoor unit's air volume;

[0031] The configuration is based on the sensible heat load of the indoor unit and the total heat treatment capacity of the indoor unit to determine the sensible heat ratio.

[0032] The configuration is designed to determine the sensible heat ratio characteristics of the indoor unit based on the outdoor ambient temperature, the indoor unit model, and the absolute humidity of the indoor unit's return air.

[0033] The configuration is to correct the initial value of the outlet wet-bulb temperature based on the sensible heat ratio and the characteristics of the indoor unit's sensible heat ratio to obtain the corrected outlet wet-bulb temperature;

[0034] The system is configured to determine the relative humidity based on the indoor unit's outlet air temperature and the corrected outlet wet-bulb temperature when the indoor unit's return air temperature reaches the target temperature, and to enter dehumidification mode when the relative humidity exceeds the set relative humidity threshold.

[0035] The above technical solution has the following advantages or beneficial effects: The air conditioner determines the sensible heat ratio based on the sensible heat load and total heat handling capacity of the indoor unit; it determines the sensible heat ratio characteristics of the indoor unit based on the outdoor ambient temperature, indoor unit model, and absolute humidity of the return air; and it corrects the initial value of the outlet wet-bulb temperature based on the sensible heat ratio and the indoor unit's sensible heat ratio characteristics to obtain the corrected outlet wet-bulb temperature. When the indoor unit's return air temperature reaches the target temperature, the relative humidity is determined based on the indoor unit's outlet air temperature and the corrected outlet wet-bulb temperature. When the relative humidity exceeds the set relative humidity threshold, it enters dehumidification mode to adjust the humidity after the air conditioner temperature stabilizes, thereby increasing the relative humidity for human use. The corrected outlet wet-bulb temperature is equivalent to a virtual wet-bulb temperature sensor, eliminating the need for a physical outlet wet-bulb temperature sensor in the air conditioner, thus reducing costs.

[0036] In some embodiments, the control module is configured with an iterative process for correcting the initial value of the outlet wet-bulb temperature: when the difference between the sensible heat ratio and the sensible heat value of the indoor unit is higher than the upper limit of the set range, the outlet wet-bulb temperature of the indoor unit is reduced; when the difference between the sensible heat ratio and the sensible heat value of the indoor unit is lower than the lower limit of the set range, the outlet wet-bulb temperature of the indoor unit is increased, until a corrected outlet wet-bulb temperature is obtained where the difference between the sensible heat ratio and the sensible heat value of the indoor unit is within the set range.

[0037] The above technical solution has the following advantages or beneficial effects: Since the outlet wet-bulb temperature cannot be directly obtained, and changes in the wet-bulb temperature affect the calculation of other parameters, the iterative method can be used to update the solution in real time to respond to changes in the system state. The iterative method allows for gradual improvement of the solution's accuracy during the calculation process, which is very useful in real-time calculations or applications requiring intermediate results.

[0038] In some embodiments, the control module is configured to terminate the iteration process if the outlet wet-bulb temperature is higher than the outlet temperature during the iteration process, and set the outlet wet-bulb temperature to the outlet temperature.

[0039] The above technical solution has the following advantages or beneficial effects: Under normal conditions, the wet-bulb temperature is less than or equal to the dry-bulb temperature. Therefore, when the outlet wet-bulb temperature is higher than the outlet temperature, the iteration process is terminated, and the outlet wet-bulb temperature is set to the outlet temperature.

[0040] In some embodiments, the control module is configured to exit the dehumidification mode when the relative humidity is lower than a set relative humidity threshold.

[0041] The above technical solution has the following advantages or beneficial effects: when the relative humidity is lower than the set relative humidity threshold, it indicates that the indoor relative humidity is good, and the dehumidification mode can be exited.

[0042] In some embodiments, the control module is used to acquire the building load, and the control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature, the indoor unit return air temperature, and the building load.

[0043] The above technical solution has the following advantages or beneficial effects: Since different buildings have different building loads, introducing the building load into the sensible heat load of the indoor unit can make the determination of the outlet air temperature more reasonable.

[0044] In some embodiments, the control module is used to obtain the room area, and the control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature, the indoor unit return air temperature, the building load, and the room area.

[0045] The above technical solution has the following advantages or beneficial effects: Since the room area has a certain impact on the indoor unit load, incorporating the room area into the sensible heat load of the indoor unit can make the determination of the outlet air temperature more reasonable.

[0046] In some embodiments, when multiple indoor units are installed in the same room, the capacity of the indoor units is obtained, and the sensible heat load of the indoor units is distributed according to the capacity of the indoor units that are turned on.

[0047] The above technical solution has the following advantages or beneficial effects: it can control the number of indoor units that are turned on separately when there are multiple indoor units in the same room.

[0048] In some embodiments, the control device is configured to determine the power of the indoor unit based on the indoor unit model and fan speed; determine the power of the outdoor unit based on the ratio of the total heat capacity of all activated indoor units to the load performance of the outdoor unit; and determine the air conditioning power based on the power of all activated indoor units and the power of the outdoor unit.

[0049] The outdoor unit load performance is determined based on the outdoor unit load rate, outdoor unit model, absolute humidity of indoor unit return air, and outdoor ambient temperature. The outdoor unit load rate is the ratio of the total heat treatment capacity of all operating indoor units to the rated performance of the outdoor unit.

[0050] Alternatively, the control module is configured to determine the outdoor unit power based on the ratio of the total sensible heat treatment capacity of all activated indoor units to the outdoor unit load performance; the outdoor unit load performance is determined based on the outdoor unit load rate, outdoor unit model, indoor unit return air dry bulb temperature, and outdoor ambient temperature, and the outdoor unit load rate is the ratio of the total sensible heat treatment capacity of all activated indoor units to the outdoor unit rated performance.

[0051] The above technical solution has the following advantages or beneficial effects: the control device can determine the air conditioner power, so that users can intuitively obtain the air conditioner power and provide users with an intuitive energy consumption display.

[0052] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1-3 This is a flowchart of an air conditioner according to an embodiment;

[0055] Figure 4 This is a flowchart illustrating the cooling mode and dehumidification mode of an air conditioner according to an embodiment;

[0056] Figure 5 A graph showing the indoor sensible heat ratio characteristics of an air conditioner according to an embodiment;

[0057] Figure 6 This is an iterative process for correcting the initial value of the outlet wet-bulb temperature;

[0058] Figure 7 A chart showing the correspondence between outdoor unit load rate, outdoor unit model, indoor unit return air temperature, outdoor ambient temperature, and outdoor unit load performance;

[0059] Figure 8 A chart showing the correspondence between indoor unit models, fan speed settings, and indoor unit power;

[0060] Figure 9 This is a flowchart of the air conditioner's heating mode according to an embodiment;

[0061] Figure 10 A diagram showing the installation of three indoor units in two rooms; Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0064] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal conduction of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes or the use of other materials.

[0068] Air conditioning units execute a refrigeration cycle using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0069] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0070] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0071] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and a throttling device can be provided in either the indoor or outdoor unit.

[0072] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0073] An air conditioner includes at least one indoor unit and at least one outdoor unit.

[0074] Air conditioners include:

[0075] Outdoor ambient temperature detection module, used to detect outdoor ambient temperature;

[0076] The indoor unit return air temperature detection module is used to detect the return air temperature of the indoor unit.

[0077] Indoor unit air volume acquisition module, used to acquire indoor unit air volume;

[0078] The control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature.

[0079] The control module is configured to determine the indoor unit outlet temperature based on the indoor unit's sensible heat load, indoor unit air volume, and indoor unit return air temperature, and use the determined indoor unit outlet temperature as the target temperature.

[0080] The control module is configured to control the operating status of the air conditioner based on the target temperature.

[0081] The air conditioner acquires the outdoor ambient temperature and the indoor unit return air temperature. Based on these temperatures, it determines the sensible heat load of the indoor unit. Then, based on the sensible heat load, the indoor unit air volume, and the indoor unit return air temperature, it determines the indoor unit outlet air temperature and uses this determined outlet air temperature as the target temperature. The air conditioner's operation is controlled according to the target temperature. Therefore, the air conditioner can predict the outlet air temperature that meets the indoor load requirements based on the indoor and outdoor ambient temperatures and the indoor unit air volume, thereby maximizing energy savings while meeting user comfort requirements.

[0082] In some embodiments, the indoor unit return air temperature detection module can also be an indoor ambient temperature detection module, and the indoor ambient temperature detected by the indoor ambient temperature detection module is used as the indoor unit return air temperature.

[0083] In some embodiments, the indoor unit airflow acquisition module acquires the indoor unit fan speed setting and determines the indoor unit airflow based on the indoor unit fan speed setting.

[0084] exist Figure 1 In this example, the control method for the air conditioner is as follows:

[0085] S1, Begin.

[0086] S2. Detect the outdoor ambient temperature and the indoor unit return air temperature.

[0087] S3. Determine the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature.

[0088] S4. Obtain the indoor unit wind deflector and determine the indoor unit airflow based on the wind deflector.

[0089] S5. Determine the indoor unit outlet temperature based on the indoor unit's sensible heat load, indoor unit air volume, and indoor unit return air temperature, and use the determined indoor unit outlet temperature as the target temperature.

[0090] S6. Control the operating status of the air conditioner according to the target temperature.

[0091] In some embodiments, the control module is configured to control the operating status of the air conditioner based on the target temperature and the indoor unit return air temperature.

[0092] There is no need to add an indoor unit outlet air temperature detection module; the air conditioner can be controlled using the indoor unit return air temperature, which can save costs.

[0093] exist Figure 2 In this example, the control method for the air conditioner is as follows:

[0094] S1, Begin.

[0095] S2. Obtain the indoor unit wind deflector and determine the indoor unit airflow based on the wind deflector.

[0096] S3. Detect the outdoor ambient temperature and the indoor unit return air temperature.

[0097] S4. Determine the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature.

[0098] S5. Determine the indoor unit outlet temperature based on the indoor unit's sensible heat load, indoor unit air volume, and indoor unit return air temperature, and use the determined indoor unit outlet temperature as the target temperature.

[0099] S6. Control the air conditioner according to the target temperature and the return air temperature of the indoor unit.

[0100] S7, |Target Temperature - Indoor Unit Return Air Temperature| < First Set Threshold. If yes, proceed to step S8; otherwise, proceed to step S3.

[0101] S8. Standby mode, proceed to step S7.

[0102] In some embodiments, the air conditioner includes:

[0103] The indoor unit outlet air temperature detection module is used to detect the outlet air temperature of the indoor unit.

[0104] The control module is configured to control the operating status of the air conditioner based on the target temperature and the indoor unit's outlet air temperature.

[0105] The control module controls the operation of the air conditioner to adjust the actual air outlet temperature of the indoor unit to the target temperature, thereby maximizing energy saving while meeting the user's comfort temperature.

[0106] exist Figure 3 In this example, the control method for the air conditioner is as follows:

[0107] S1, Begin.

[0108] S2. Obtain the indoor unit wind deflector and determine the indoor unit airflow based on the wind deflector.

[0109] S3. Detects outdoor ambient temperature, indoor unit return air temperature, and indoor unit outlet air temperature.

[0110] S4. Determine the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature.

[0111] S5. Determine the indoor unit outlet temperature based on the indoor unit's sensible heat load, indoor unit air volume, and indoor unit return air temperature, and use the determined indoor unit outlet temperature as the target temperature.

[0112] S6. Control the air conditioner according to the target temperature and the indoor unit's outlet air temperature.

[0113] S7|Target Temperature - Indoor Unit Air Outlet Temperature| < Second Set Threshold. If yes, proceed to step S8; otherwise, proceed to step S3.

[0114] S8. Standby mode, proceed to step S7.

[0115] The control module is configured to determine the sensible heat load TL_SH_idu of the indoor unit based on the outdoor ambient temperature ToaDB and the dry-bulb return air temperature TraDB_idu of the indoor unit.

[0116] In some embodiments, the control module is used to obtain the building load q0, and the control module is configured to determine the sensible heat load TL_SH_idu of the indoor unit based on the outdoor ambient temperature ToaDB, the indoor unit return air dry bulb temperature TraDB_idu, and the building load q0.

[0117] Since different buildings have different building loads q0, incorporating the building load q0 into the indoor unit's sensible heat load TL_SH_idu can make the determination of the outlet air temperature TsaDB_idu more reasonable.

[0118] In some embodiments, the control module is used to obtain the room area A, and the control module is configured to determine the sensible heat load TL_SH_idu of the indoor unit based on the outdoor ambient temperature ToaDB, the indoor unit return air dry bulb temperature TraDB_idu, the building load q0, and the room area A.

[0119] Since the room area A has a certain impact on the indoor unit load, incorporating the room area A into the indoor unit's sensible heat load TL_SH_idu can make the determination of the outlet air temperature TsaDB_idu more reasonable.

[0120] In some embodiments, TL_SH_idu=(c*q0+(a / ΔT+b)*q0)*A.

[0121] Where (a / ΔT+b)*q0 is the load correction, ΔT is the indoor and outdoor temperature difference, in cooling mode the indoor temperature is less than 30, (a / ΔT+b)×q0=0; in heating mode the indoor temperature is greater than 20, (a / ΔT+b)×q0=0; c, a, b are predetermined values, A is the room area, which can be set by the indoor unit DIP switch when installing the unit.

[0122] In some embodiments, when the air conditioner is operating in cooling mode, the sensible heat handling capacity Psh_idu of the indoor unit is determined by the indoor sensible heat load TL_SH_idu, and then the required outlet dry-bulb temperature TsaDB_idu of the indoor unit is obtained. Assuming the outlet wet-bulb temperature of the indoor unit is TsaWB_idu, the corrected outlet wet-bulb temperature TsaWB_idu is obtained through iterative calculation based on the relationship between the sensible heat ratio characteristic CV_SHR_idu and the calculated sensible heat ratio SHR_act_idu. Since the wet-bulb temperature cannot be greater than the dry-bulb temperature, if the calculated wet-bulb temperature is greater than the dry-bulb temperature, it is forcibly corrected to make the two equal. The cooling mode is then determined to switch to dehumidification mode based on the corrected outlet wet-bulb temperature and outlet dry-bulb temperature. Finally, the power of the indoor and outdoor units is obtained through the indoor and outdoor unit characteristic tables.

[0123] The indoor unit outlet dry-bulb temperature TsaDB_idu is the sum of the quotient of the indoor unit sensible heat load TL_SH_idu and the indoor unit air volume AF_idu, and the indoor unit return air dry-bulb temperature TraDB_idu.

[0124] The indoor unit outlet temperature in cooling mode is calculated by summing the quotient of the indoor unit's sensible heat load and the indoor unit's air volume with the indoor unit's return air temperature. This outlet temperature can quickly meet the indoor load requirements of cooling mode without overloading, thus saving energy.

[0125] TsaDB_idu=TraDB_idu+TL_SH_idu*1000 / (AF_idu) / 0.33.

[0126] In some embodiments, the air conditioner includes:

[0127] The indoor unit return air dry bulb temperature acquisition module is used to acquire the indoor unit return air dry bulb temperature TraDB_idu;

[0128] The indoor unit return air wet-bulb temperature acquisition module is used to acquire the indoor unit return air wet-bulb temperature TraWB_idu;

[0129] When the air conditioner is running in cooling mode, the control module has an initial value for the indoor unit outlet wet-bulb temperature TsaWB_idu, for example, the initial value of TsaWB_idu is 10℃.

[0130] The control module is configured to determine the indoor unit return air enthalpy Hra_idu and the indoor unit return air absolute humidity AH_ra_idu based on the indoor unit return air dry-bulb temperature TraDB_idu, the indoor unit return air wet-bulb temperature TraWB_idu, and the atmospheric pressure AP; and to determine the indoor unit outlet air enthalpy Hsa_idu based on the indoor unit outlet air dry-bulb temperature TsaDB_idu, the indoor unit outlet air wet-bulb temperature TsaWB_idu, and the atmospheric pressure AP.

[0131] Hra_idu=Enth(TraDB,TraWB,AP);

[0132] Hsa_idu=Enth(TsaDB,TsaWB,AP);

[0133] AH_ra_idu = AH(TraDB,TraWB,AP); where the atmospheric pressure AP is obtained from the enthalpy-humidity chart.

[0134] The control module is configured to determine the total heat treatment capacity Pth_idu of the indoor unit based on the difference between the indoor unit's outlet air enthalpy Hsa_idu and the indoor unit's return air enthalpy Hra_idu, and the indoor unit's air volume AF_idu.

[0135] Pth_idu=(Hra_idu-Hsa_idu)*(AF_idu)*0.33 / 1000.

[0136] The sensible heat handling capacity of the indoor unit, Psh_idu, is equal to the sensible heat load of the indoor unit, TL_SH_idu.

[0137] Psh_idu = TL_SH_idu.

[0138] The latent heat treatment capacity of the indoor unit, Plh_idu, is calculated by subtracting the sensible heat treatment capacity of the indoor unit, Psh_idu, from the total heat treatment capacity of the indoor unit: Plh_idu = Pth_idu - Psh_idu.

[0139] The control module is configured to determine the sensible heat ratio SHR_act_idu based on the sensible heat treatment capacity of the indoor unit Psh_idu and the total heat treatment capacity of the indoor unit Pth_idu: SHR_act_idu = Psh_idu / Pth_idu.

[0140] The control module is configured to determine the sensible heat ratio characteristic CV_SHR_idu of the indoor unit based on the outdoor ambient temperature ToaDB, the indoor unit model Model_name_idu, and the absolute humidity of the indoor unit return air AH_ra_idu.

[0141] exist Figure 5 In the example, the indoor sensible heat ratio characteristic CV_SHR_idu chart is determined in advance, and the indoor sensible heat ratio characteristic CV_SHR_idu is in Figure 5 If no specific value is found in the chart, interpolation can be used to calculate it.

[0142] The control module is configured to correct the initial value of the outlet wet-bulb temperature TsaWB_idu based on the sensible heat ratio SHR_act_idu and the indoor unit's sensible heat ratio characteristic CV_SHR_idu, thus obtaining the corrected outlet wet-bulb temperature TsaWB_idu.

[0143] In some embodiments, the control module is configured with an iterative process for correcting the initial value of the outlet wet-bulb temperature: when the difference between the sensible heat ratio SHR_act_idu and the indoor unit sensible heat ratio characteristic CV_SHR_idu is higher than the upper limit of a set range, the indoor unit outlet wet-bulb temperature TsaWB_idu is decreased; when the difference between the sensible heat ratio SHR_act_idu and the indoor unit sensible heat ratio characteristic CV_SHR_idu is lower than the lower limit of a set range, the indoor unit outlet wet-bulb temperature TsaWB_idu is increased, until a corrected outlet wet-bulb temperature TsaWB_idu is obtained where the difference between the sensible heat ratio SHR_act_idu and the indoor unit sensible heat ratio characteristic CV_SHR_idu is within the set range.

[0144] Since the outlet wet-bulb temperature cannot be directly obtained, and changes in wet-bulb temperature affect the calculation of other parameters, iterative methods can be used to update the solution in real time to respond to changes in the system state. Iterative methods allow for incremental improvement of the solution's accuracy during the calculation process, which is very useful in real-time calculations or applications requiring intermediate results.

[0145] In some embodiments, the control module is configured to terminate the iteration process if the outlet wet-bulb temperature TsaWB_idu is higher than the outlet temperature TsaDB_idu during the iteration process, and set the outlet wet-bulb temperature TsaWB_idu to the outlet temperature TsaDB_idu.

[0146] Under normal conditions, the wet-bulb temperature is less than or equal to the dry-bulb temperature. Therefore, the iteration process terminates when the outlet wet-bulb temperature is higher than the outlet temperature, and the outlet wet-bulb temperature is set to the outlet temperature.

[0147] In some embodiments, the deviation between the calculated sensible heat ratio SHR_act_idu and the sensible heat ratio characteristic CV_SHR_idu of the indoor unit is required to be within ±0.1. If this deviation is within ±0.1, the iterative calculation of TsaWB_idu terminates the convergence loop. If SHR_act_idu - CV_SHR_idu > 0.1, TsaDB_idu is decreased by 0.2℃, and the above calculation continues. If SHR_act_idu - CV_SHR_idu < -0.1, TsaDB_idu is increased by 0.2℃, and the above calculation continues. Furthermore, if TsaWB_idu ≥ TsaDB_idu, the convergence loop is forcibly terminated, and the final converged TsaWB_idu = TsaDB_idu, and the heat treatment amount is recalculated.

[0148] exist Figure 6 In the example, the iterative method for correcting the initial value of the outlet wet-bulb temperature is as follows:

[0149] S1, TsaWB_idu = initial value.

[0150] S2, Pth_idu=(Hra_idu, Hsa_idu, AF_idu);

[0151] Psh_idu = TL_SH_idu;

[0152] SHR_act_idu=Psh_idu / Pth_idu;

[0153] CV_SHR_idu=(Model_name_idu, ToaDB, AH_ra_idu).

[0154] S3, SHR_act_idu-CV_SHR_idu<-0.1, if yes, proceed to step S4, otherwise proceed to step S5.

[0155] S4, TsaDB_idu increases by 0.2℃, proceed to step S2.

[0156] S5. If SHR_act_idu-CV_SHR_idu>0.1, proceed to step S6; otherwise, proceed to step S7.

[0157] S6, TsaDB_idu decreases by 0.2℃, proceed to step S2.

[0158] S7. Obtain TsaDB_idu.

[0159] S8. If TsaWB_idu ≥ TsaDB_idu, proceed to step S9; otherwise, proceed to step S7.

[0160] S9, TsaWB_idu = TsaDB_idu.

[0161] The control module is configured to determine the relative humidity based on the indoor unit's outlet air temperature and the corrected outlet wet-bulb temperature when the indoor unit's return air temperature reaches the target temperature, and to enter dehumidification mode when the relative humidity exceeds the set relative humidity threshold.

[0162] The air conditioner determines the sensible heat ratio based on the indoor unit's sensible heat load and total heat handling capacity. It then determines the indoor unit's sensible heat ratio characteristics based on the outdoor ambient temperature, indoor unit model, and absolute humidity of the return air. The initial value of the outlet wet-bulb temperature is corrected using these characteristics to obtain the corrected outlet wet-bulb temperature. When the indoor unit's return air temperature reaches the target temperature, the relative humidity is determined based on the outlet air temperature and the corrected outlet wet-bulb temperature. If the relative humidity exceeds a set threshold, the air conditioner enters dehumidification mode to regulate humidity and increase relative humidity for human comfort after the air conditioner temperature stabilizes. The corrected outlet wet-bulb temperature acts as a virtual wet-bulb temperature sensor, eliminating the need for a physical outlet wet-bulb temperature sensor and reducing costs.

[0163] In some embodiments, the control module is configured to exit the dehumidification mode when the relative humidity is lower than a set relative humidity threshold.

[0164] When the relative humidity is lower than the set relative humidity threshold, it means that the indoor relative humidity is good, and you can exit the dehumidification mode.

[0165] exist Figure 4 In this example, the control method for the air conditioner's cooling mode is as follows:

[0166] S1, refrigeration begins.

[0167] S2. Calculate the dry-bulb temperature of the indoor unit outlet air by summing the quotient of the indoor unit's sensible heat load and the indoor unit's air volume with the indoor unit's return air temperature, and then calculate the wet-bulb temperature.

[0168] S3. The air conditioner is controlled using the dry-bulb temperature of the indoor unit's outlet air as the target temperature.

[0169] S4. If the indoor unit outlet air temperature - target temperature < cooling set threshold, proceed to step S5; otherwise, proceed to step S2.

[0170] S5. Determine the relative humidity based on the indoor unit's outlet air temperature and the corrected outlet wet-bulb temperature.

[0171] S6. If the relative humidity exceeds the set threshold, proceed to step S7; otherwise, proceed to step S9.

[0172] S7. Enter dehumidification mode.

[0173] S8. If the relative humidity is lower than the set threshold, proceed to step S9; otherwise, proceed to step S7.

[0174] S9. Standby mode, proceed to step S4.

[0175] In some embodiments, the control device is configured to determine the indoor unit power PI_idu based on the indoor unit model Model_name_idu and the fan speed fan_tap_idu; and based on the total heat treatment capacity of all activated indoor units. The outdoor unit power PI_odu is determined by the ratio of the outdoor unit's load performance COP_odu; the power of all activated indoor units is then considered. The air conditioner power PI_AC is determined by the outdoor unit power PI_odu.

[0176] Among them, the outdoor unit load performance COP_odu is determined based on the outdoor unit load rate PL_odu, the outdoor unit model Model_name_odu, the outdoor ambient temperature ToaDB, and the average indoor absolute humidity AH_ra_idu_ave. The outdoor unit load rate PL_odu is the total heat treatment capacity of all indoor units in operation. Rated Cap_odu, as a ratio to the rated performance of the outdoor unit.

[0177] The outdoor unit load power PL_odu is the ratio of the total heat treatment capacity of all active indoor units to the rated performance of the outdoor unit.

[0178] The outdoor unit load performance COP_odu is searched in the ODU_PL_DB characteristic table based on the outdoor unit load rate PL_odu, outdoor unit model Model_name_odu, outdoor ambient temperature ToaDB, and indoor absolute humidity average value AH_ra_idu_ave. If no corresponding value is found, interpolation is used for calculation. Figure 7 The ODU_PL_DB characteristic table of the instance records the performance of different models under different indoor and outdoor operating conditions and different loads.

[0179] Outdoor unit power The indoor unit power PI_idu is searched in the iDU-DB characteristic table based on Model_name_idu and Fan_tap_idu. The iDU-DB characteristic table records the airflow and power of different indoor unit models and different fan settings, as shown in the example below. Figure 8 As shown.

[0180] Air conditioner power

[0181] In some embodiments, when the air conditioner is operating in heating mode, the sensible heat handling capacity of the indoor unit is determined by the indoor sensible heat load, thereby obtaining the required dry-bulb temperature of the indoor unit, and finally obtaining the power of the indoor and outdoor units through the indoor and outdoor unit characteristic tables.

[0182] In heating mode, latent heat calculation and humidity adjustment are not performed; only sensible heat and dry bulb temperature adjustment are processed.

[0183] The indoor unit outlet dry bulb temperature TsaDB_idu is the difference between the quotient of the indoor unit sensible heat load TL_SH_idu and the indoor unit air volume AF_idu and the indoor unit return air temperature TraDB_idu.

[0184] The indoor unit outlet temperature in heating mode is calculated by the difference between the quotient of the indoor unit's sensible heat load and the indoor unit's air volume and the indoor unit's return air temperature. This indoor unit outlet temperature can quickly meet the indoor load requirements of the heating mode without overloading, thus saving energy.

[0185] TsaDB_idu=TL_SH_idu*1000 / (AF_idu) / 0.33-TraDB_idu.

[0186] exist Figure 9In this example, the control method for the air conditioner's heating mode is as follows:

[0187] S1, Heating begins.

[0188] S2. Calculate the dry bulb temperature of the indoor unit outlet air by the difference between the quotient of the indoor unit's sensible heat load and the indoor unit's air volume and the indoor unit's return air temperature.

[0189] S3. The air conditioner is controlled using the dry-bulb temperature of the indoor unit's outlet air as the target temperature.

[0190] S4. If the target temperature - indoor unit outlet air temperature < heating set threshold, proceed to step S5; otherwise, proceed to step S2.

[0191] S5. Standby mode, proceed to step S4.

[0192] The outdoor unit load power PL_odu is the ratio of the total sensible heat treatment capacity of all indoor units in operation to the rated performance of the outdoor unit.

[0193] The outdoor unit load performance COP_odu is searched in the ODU_PL_DB characteristic table based on the outdoor unit load rate PL_odu, outdoor unit model Model_name_odu, outdoor ambient temperature ToaDB, and the average value of the return air dry bulb temperature of each indoor unit TraDB_idu_ave. If no corresponding value is found, interpolation is used for calculation.

[0194] Outdoor unit power

[0195] The indoor unit power Pi_idu is searched in the iDU-DB characteristic table based on ModeL_name_idu and the fan deflector Fan_tap_idu.

[0196] Air conditioner power

[0197] In some embodiments, when multiple indoor units are installed in the same room, the capacity of the indoor units is obtained, and the sensible heat load of the indoor units is distributed according to the capacity of the indoor units that are turned on.

[0198] When there are multiple indoor units in the same room, the number of indoor units that are turned on can be controlled separately.

[0199] exist Figure 10In this example, taking three indoor units as an example, two indoor units are in one room (ROOM-1), and the third indoor unit is in another room (ROOM-2). ROOM-1 has a sensible heat load of 10kW. Indoor unit IDU-1 has a capacity of 6HP, and indoor unit IDU-2 has a capacity of 4HP. If both indoor units are on, indoor unit IDU-1 needs to handle 6kW of sensible heat, and indoor unit IDU-2 needs to handle 4kW of sensible heat. If only one unit is on, it needs to handle 10kW of sensible heat.

[0200] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0201] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, comprising: Outdoor ambient temperature detection module, used to detect outdoor ambient temperature; The indoor unit return air temperature detection module is used to detect the return air temperature of the indoor unit. The air conditioner is characterized in that it further includes: Indoor unit air volume acquisition module, used to acquire indoor unit air volume; The control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature and the indoor unit return air temperature. The control module is configured to determine the indoor unit outlet temperature based on the indoor unit sensible heat load, the indoor unit air volume, and the indoor unit return air temperature, and to use the determined indoor unit outlet temperature as the target temperature. The control module is configured to control the operating status of the air conditioner according to the target temperature.

2. The air conditioner according to claim 1, characterized in that, The control module is configured to control the operating status of the air conditioner based on the target temperature and the indoor unit return air temperature. Alternatively, the air conditioner may include: The indoor unit outlet air temperature detection module is used to detect the outlet air temperature of the indoor unit. The control module is configured to control the operating status of the air conditioner based on the target temperature and the indoor unit's outlet air temperature.

3. The air conditioner according to claim 1, characterized in that, When the air conditioner is running in cooling mode, the indoor unit outlet air temperature is the sum of the quotient of the indoor unit sensible heat load and the indoor unit air volume, and the indoor unit return air temperature. When the air conditioner is running in heating mode, the indoor unit's outlet air temperature is the difference between the ratio of the indoor unit's sensible heat load and the indoor unit's air volume and the indoor unit's return air temperature.

4. The air conditioner according to claim 1, characterized in that, The air conditioner includes: The indoor unit return air dry bulb temperature acquisition module is used to acquire the indoor unit return air dry bulb temperature. The indoor unit return air wet-bulb temperature acquisition module is used to acquire the indoor unit return air wet-bulb temperature. When the air conditioner is running in cooling mode, the control module has the initial value of the indoor unit's outlet wet bulb temperature; The control module is configured to determine the enthalpy of the indoor unit return air and the absolute humidity of the indoor unit return air based on the dry-bulb temperature of the indoor unit return air, the wet-bulb temperature of the indoor unit return air and atmospheric pressure; and to determine the enthalpy of the indoor unit outlet air based on the outlet air temperature of the indoor unit, the wet-bulb temperature of the indoor unit outlet air and atmospheric pressure. The configuration is to determine the total heat treatment capacity of the indoor unit based on the difference between the indoor unit's outlet air enthalpy and the indoor unit's return air enthalpy and the indoor unit's air volume; The configuration is based on the sensible heat load of the indoor unit and the total heat treatment capacity of the indoor unit to determine the sensible heat ratio. The configuration is designed to determine the sensible heat ratio characteristics of the indoor unit based on the outdoor ambient temperature, the indoor unit model, and the absolute humidity of the indoor unit's return air. The configuration is to correct the initial value of the outlet wet-bulb temperature based on the sensible heat ratio and the characteristics of the indoor unit's sensible heat ratio to obtain the corrected outlet wet-bulb temperature; The system is configured to determine the relative humidity based on the indoor unit's outlet air temperature and the corrected outlet wet-bulb temperature when the indoor unit's return air temperature reaches the target temperature, and to enter dehumidification mode when the relative humidity exceeds the set relative humidity threshold.

5. The air conditioner according to claim 4, characterized in that, The control module is configured with an iterative process to correct the initial value of the outlet wet-bulb temperature: when the difference between the sensible heat ratio and the sensible heat value of the indoor unit is higher than the upper limit of the set range, the outlet wet-bulb temperature of the indoor unit is reduced; when the difference between the sensible heat ratio and the sensible heat value of the indoor unit is lower than the lower limit of the set range, the outlet wet-bulb temperature of the indoor unit is increased, until the corrected outlet wet-bulb temperature is obtained where the difference between the sensible heat ratio and the sensible heat value of the indoor unit is within the set range.

6. The air conditioner according to claim 5, characterized in that, The control module is configured to terminate the iteration process if the outlet wet-bulb temperature is higher than the outlet air temperature during the iteration process, and set the outlet wet-bulb temperature to the outlet air temperature.

7. The air conditioner according to claim 1, characterized in that, The control module is used to acquire the building load, and the control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature, the indoor unit return air temperature and the building load.

8. The air conditioner according to claim 7, characterized in that, The control module is used to obtain the room area, and the control module is configured to determine the sensible heat load of the indoor unit based on the outdoor ambient temperature, the indoor unit return air temperature, the building load, and the room area.

9. The air conditioner according to claim 1, characterized in that, When multiple indoor units are installed in the same room, the capacity of the indoor units is obtained, and the sensible heat load of the indoor units is distributed according to the capacity of the indoor units that are turned on.

10. The air conditioner according to any one of claims 4-9, characterized in that, The control device is configured to determine the power of the indoor unit based on the indoor unit model and fan speed; determine the power of the outdoor unit based on the ratio of the total heat capacity of all activated indoor units to the load performance of the outdoor unit; and determine the air conditioning power based on the power of all activated indoor units and the power of the outdoor unit. The outdoor unit load performance is determined based on the outdoor unit load rate, outdoor unit model, absolute humidity of indoor unit return air, and outdoor ambient temperature. The outdoor unit load rate is the ratio of the total heat treatment capacity of all operating indoor units to the rated performance of the outdoor unit. Alternatively, the control module is configured to determine the outdoor unit power based on the ratio of the total sensible heat treatment capacity of all activated indoor units to the outdoor unit load performance; the outdoor unit load performance is determined based on the outdoor unit load rate, outdoor unit model, indoor unit return air dry bulb temperature, and outdoor ambient temperature, and the outdoor unit load rate is the ratio of the total sensible heat treatment capacity of all activated indoor units to the outdoor unit rated performance.

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