Air conditioner and system capability calculation method of air conditioner

Abstract

The invention discloses an air conditioner and a method for calculating system capacity of the air conditioner, and the air conditioner comprises a refrigeration loop which is used for enabling a refrigerant to circulate through a compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger in sequence, one of the outdoor heat exchanger and the indoor heat exchanger is used as a condenser, and the other one of the outdoor heat exchanger and the indoor heat exchanger is used as an evaporator; the temperature sensor is used for detecting the temperature of a coil pipe of the indoor heat exchanger; the temperature detection device is used for detecting inlet and outlet temperatures of the indoor heat exchanger; correspondingly determining a capability phase region representing the system capability of the air conditioner according to the current operation mode of the air conditioner; obtaining operation parameters of a refrigerating circuit of the air conditioner, the coil pipe temperature of the indoor heat exchanger and the inlet and outlet temperature of the indoor heat exchanger, and calculating the phase region heat of a refrigerant in the capacity phase region; and calculating the operation capability value of the controller in the current operation mode according to the phase region heat. The method can improve the accuracy of capacity calculation of the air conditioning system.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a method for calculating the system capacity of the air conditioner. Background Art

[0002] Existing air conditioners all have a system capacity calculation function. By calculating the system capacity, we can understand the cooling capacity of the current air conditioning system, whether it is consistent with the nominal parameters on the product nameplate, and monitor the performance of the controller.

[0003] Currently, air conditioners can add temperature detection devices at the inlet and outlet of the indoor motor evaporator to calculate the inlet and outlet air enthalpy and thus obtain the air conditioning capacity. However, the existing method of estimating enthalpy only by temperature is too inaccurate. Summary of the Invention

[0004] An object of the embodiments of the present invention is to provide an air conditioner and a method for calculating the system capacity of the air conditioner, which can improve the accuracy of calculating the capacity of the air conditioning system.

[0005] An embodiment of the present invention provides an air conditioner, comprising:

[0006] a refrigeration circuit in which a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other serves as an evaporator;

[0007] a temperature sensor for detecting the coil temperature of the indoor heat exchanger;

[0008] a temperature detection device for detecting the inlet and outlet temperatures of the indoor heat exchanger;

[0009] The controller is configured as:

[0010] Determining a capability phase region representing the capability of the air conditioner system according to the current operating mode of the air conditioner;

[0011] Obtaining the operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase heat of the refrigerant in the capacity phase region;

[0012] An operating capability value of the controller in a current operating mode is calculated according to the phase region heat.

[0013] Preferably, the controller is further configured to:

[0014] When the controller is in a cooling operation mode, determining that the capacity phase region of the controller includes a two-phase region and a superheat region;

[0015] When the controller is in a heating operation mode, it is determined that the capacity phase region of the controller includes a two-phase region, a superheating region, and a supercooling region.

[0016] As a preferred solution, the operating parameters include the operating frequency of the compressor and the speed of the indoor fan.

[0017] Preferably, the controller is further configured to:

[0018] When the controller is in cooling operation mode, the latent heat of vaporization value of the refrigerant is matched according to the coil temperature;

[0019] Calculating the two-phase heat of the refrigerant based on the latent heat of vaporization, the air inlet temperature of the indoor heat exchanger, the coil temperature, and the operating frequency of the compressor;

[0020] The heat of the superheated zone is calculated according to the indoor fan speed, the operating frequency, the air inlet temperature and the coil temperature.

[0021] Preferably, the controller is further configured to:

[0022] When the controller is in heating operation mode, the latent heat of vaporization of the refrigerant is matched according to the coil temperature;

[0023] Calculating the two-phase heat and the superheated heat of the refrigerant according to the operating frequency of the compressor, the outlet temperature of the indoor heat exchanger, the latent heat of vaporization, and the coil temperature;

[0024] The subcooling zone heat is calculated according to the indoor fan speed, the operating frequency, the air outlet temperature and the coil temperature.

[0025] Preferably, the two-phase region heat

[0026] The heat of the superheated zone

[0027] Wherein, Fan is the indoor fan speed, Fre is the operating frequency, R incoil is the latent heat of vaporization, T incoil is the coil temperature, Ts is the air inlet temperature, Q Bc is the heat reference value of the refrigerant superheat zone, a 1c 、a 2c 、b 1c 、c 1c and n1 are preset constant values.

[0028] Preferably, the two-phase region heat

[0029] The heat of the superheated zone

[0030] The heat of the supercooling zone

[0031] Wherein, Fan is the indoor fan speed, Fre is the operating frequency, R incoil is the latent heat of vaporization, T incoil is the coil temperature, Tp is the outlet temperature, Q B h is the heat reference value of the refrigerant supercooling zone, a 1h 、a 2h 、b 1h 、a 3h and n2 are preset constant values.

[0032] Preferably, when the air conditioner is in cooling mode, the controller's operating capacity value Q c =a c *(Q 1c +Q2c);

[0033] Among them, a c is the proportional constant of the cooling operation mode, Q 1c is the two-phase heat in the cooling operation mode, Q 2c It is the heat of superheat area in cooling operation mode.

[0034] Preferably, when the air conditioner is in the heating operation mode, the operation capacity value Q of the controller is h =a h *(Q 1h +Q 2h +Q 3h );

[0035] Among them, a h is the proportional constant of the heating operation mode, Q 1h is the two-phase heat in the heating operation mode, Q 2h is the heat of the superheated zone in the heating operation mode, Q 3h It is the heat of the subcooling area in the heating operation mode.

[0036] An embodiment of the present invention provides a method for calculating system capacity of an air conditioner, the air conditioner comprising:

[0037] a refrigeration circuit in which a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other serves as an evaporator;

[0038] a temperature sensor for detecting the coil temperature of the indoor heat exchanger;

[0039] a temperature detection device for detecting the inlet and outlet temperatures of the indoor heat exchanger;

[0040] Controller;

[0041] The method comprises:

[0042] Determining a capability phase region representing the capability of the air conditioner system according to the current operating mode of the air conditioner;

[0043] Obtaining the operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase heat of the refrigerant in the capacity phase region;

[0044] An operating capability value of the controller in a current operating mode is calculated according to the phase region heat.

[0045] Compared to the prior art, the air conditioner and air conditioner system capacity calculation method disclosed in the present invention include: a refrigeration circuit, wherein a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other as an evaporator; a temperature sensor for detecting the coil temperature of the indoor heat exchanger; a temperature detection device for detecting the inlet and outlet temperatures of the indoor heat exchanger; determining a capacity phase region representing the air conditioner system capacity according to the current operating mode of the air conditioner; obtaining operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase region heat of the refrigerant in the capacity phase region; and calculating the operating capacity value of the controller in the current operating mode based on the phase region heat. This application can improve the accuracy of air conditioning system capacity calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention in one implementation manner;

[0047] Figure 2 is a partial structural diagram of a refrigeration circuit of an air conditioner according to an embodiment of the present invention;

[0048] Figure 3 is another structural schematic diagram of an air conditioner provided by an embodiment of the present invention;

[0049] Figure 4 This is a structural diagram of the connection relationship between the air conditioner and other devices provided by an embodiment of the present invention;

[0050] Figure 5 is a flow chart of steps executed by a controller provided in an embodiment of the present invention;

[0051] Figure 6is another flow chart of steps performed by the air conditioner provided in an embodiment of the present invention;

[0052] Figure 7 is another flow chart of steps performed by the air conditioner provided in an embodiment of the present invention;

[0053] Figure 8 Schematic diagram of the refrigerant temperature change process provided by an embodiment of the present invention;

[0054] Figure 9 is another flow chart of steps performed by the air conditioner provided in an embodiment of the present invention;

[0055] Figure 10 This is another flowchart of the steps performed by the air conditioner provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0058] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0060] See also Figure 1 , is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, according to an embodiment of the present invention. The air conditioner 100 includes an indoor unit 110 and an outdoor unit 120. The indoor unit 110 is typically located indoors and may be a wall-mounted unit or a cabinet unit. The outdoor unit 120 is typically located outdoors and is used for heat exchange in the indoor environment. The air conditioner 100 includes a refrigeration circuit 130. By circulating a refrigerant in the refrigeration circuit 130, a vapor compression refrigeration cycle can be implemented. Connecting piping is used to connect the indoor unit 110 and the outdoor unit 120 to form a refrigeration circuit for refrigerant circulation.

[0061] See also Figure 2 , is a partial structural diagram of the refrigeration circuit of the air conditioner in an embodiment of the present invention. In this application, the air conditioner performs the refrigeration cycle of the air conditioner by using a compressor 131, an indoor heat exchanger 132, an expansion valve 133 and an outdoor heat exchanger 134. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air. Among them, the indoor heat exchanger 132 is usually provided in the indoor unit 110, the compressor 131 and the outdoor heat exchanger 134 are usually provided in the outdoor unit 120, and the expansion valve 133 can be provided in the indoor unit 110 or the outdoor unit 120. The indoor heat exchanger 132 and the outdoor heat exchanger 134 serve as a condenser or an evaporator. When the indoor heat exchanger 132 serves as a condenser, the air conditioner serves as a heater in the heating mode. When the indoor heat exchanger 132 serves as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0062] Compressor 131 compresses 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, releasing heat to the surrounding environment through the condensation process. Expansion valve 133 expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in expansion valve 133 and returns the low-temperature, low-pressure refrigerant gas to compressor 131. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout this cycle, the air conditioner can adjust the temperature of the indoor space.

[0063] The air conditioner provided in an embodiment of the present invention includes:

[0064] a refrigeration circuit in which a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other serves as an evaporator;

[0065] a temperature sensor for detecting the coil temperature of the indoor heat exchanger;

[0066] Inlet and outlet temperature devices, used to detect the inlet and outlet temperatures of the indoor heat exchanger;

[0067] Controller;

[0068] In the specific implementation, see Figure 3 , is another structural diagram of an air conditioner provided in an embodiment of the present invention, wherein the air conditioner includes a compressor 131, an indoor heat exchanger 132, an outdoor heat exchanger 134, an expansion valve 133, a temperature sensor 135, and a temperature detection device 136.

[0069] The exhaust port of compressor 131 is connected to the refrigerant inlet of indoor heat exchanger 132 via a pipeline. The refrigerant outlet of indoor heat exchanger 132 is connected to the refrigerant inlet of expansion valve 133 via a pipeline. The refrigerant outlet of expansion valve 133 is connected to the refrigerant inlet of outdoor heat exchanger 134 via a pipeline. The refrigerant outlet of outdoor heat exchanger 134 is connected to the intake port of compressor 131 via a pipeline. The refrigerant circulates sequentially through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger, forming a refrigeration circuit. In the refrigeration circuit, one of the outdoor heat exchanger and the indoor heat exchanger functions as a condenser, and the other functions as an evaporator.

[0070] The air conditioner further includes a temperature sensor 135 , which is disposed on the middle coil of the indoor heat exchanger of the air conditioner and is used to detect the coil temperature.

[0071] It should be noted that the temperature sensor installed on the indoor heat exchanger coil is a standard accessory for existing smart air conditioners and is generally installed in conventional air conditioners. Therefore, when evaluating the air conditioner system performance, this application uses the temperature sensor to detect the coil temperature, eliminating the need to install other sensors on existing air conditioners. Compared with the existing technology, this application solution can effectively reduce costs by eliminating the need to add inlet and outlet temperature and pressure sensors to the indoor unit and predict the inlet and outlet enthalpy of the refrigerant on the indoor unit side.

[0072] In the present application, the air conditioner further includes a temperature detection device 136, which is provided on the indoor unit of the air conditioner and is used to detect the inlet and outlet temperatures of the indoor heat exchanger.

[0073] The controller configured for the air conditioner is used to control the operation of the air conditioner and calculate the system capacity of the air conditioner. Figure 4 , is a structural diagram of the connection relationship between the air conditioner and other devices provided by an embodiment of the present invention.

[0074] The controller 142 is connected to the refrigeration circuit 130 and the temperature sensor 135 , ie, the temperature detection device 136 .

[0075] It should be noted that the temperature detection device 136 includes an air inlet temperature sensor 137 and an air outlet temperature sensor 138 .

[0076] The air inlet temperature sensor 137 is provided at the air inlet of the indoor heat exchanger and is used to detect the air inlet temperature of the indoor heat exchanger.

[0077] The air outlet temperature sensor 138 is provided at the air outlet of the indoor heat exchanger and is used to detect the air outlet temperature of the indoor heat exchanger.

[0078] The controller needs to obtain the operating parameters and operating mode of the refrigeration circuit, and complete the system capacity calculation of the air conditioner in combination with the temperature data detected by the temperature sensor and the temperature detection device.

[0079] In the embodiment of the present invention, see Figure 5 , is a flow chart of steps executed by the controller provided in an embodiment of the present invention. The controller 142 can execute the system capacity calculation operation of the air conditioner in response to a preset instruction, specifically including steps S1 to S3:

[0080] S1, determining a capability phase region representing the capability of the air conditioner system according to the current operating mode of the air conditioner;

[0081] S2, obtaining the operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase heat of the refrigerant in the capacity phase region;

[0082] S3, calculating the operating capacity value of the controller according to the phase region heat.

[0083] In the specific implementation, see Figure 6 , is another flow chart of steps executed by the air conditioner provided in an embodiment of the present invention. When the controller receives the system capacity calculation instruction, it executes the following steps:

[0084] Step S601: Detect the current operating mode of the air conditioner.

[0085] The operating modes of the air conditioner include cooling mode and heating mode. When the air conditioner is in different modes, the corresponding methods of representing the air conditioner system capacity are different.

[0086] Step S602: determining the capability range of the system capability of the air conditioner in the operating mode.

[0087] It should be noted that the three zones of the air conditioner include three areas: the area to the left of the saturated liquid line is the liquid phase area, the area to the right of the saturated vapor line is the gas phase area, and the middle area is the two-phase area. In the liquid phase area, the refrigerant is a subcooled liquid, and the refrigerant temperature is lower than the saturation temperature at the same pressure. In the gas phase area, the refrigerant is a superheated vapor, and the refrigerant temperature is higher than the saturation temperature at the same pressure. In the two-phase area, the refrigerant is a wet vapor with coexistence of gas and liquid, in a saturated state, with a one-to-one correspondence between pressure and temperature. The determined capacity phase area is specifically at least one of the above three areas.

[0088] The heat generated by refrigerant condensation represents the system's heating capacity, while the heat generated by refrigerant evaporation in cooling mode represents the system's cooling capacity. The latent heat of vaporization during the condensation or evaporation process accounts for the vast majority of the heat. Depending on the air conditioner's operating mode, the corresponding capacity phase representing cooling or heating capacity is determined.

[0089] Step S603: Acquire the operating parameters of the air conditioner refrigeration circuit.

[0090] It should be noted that the operating parameters are used to characterize the working performance of the current refrigeration circuit.

[0091] Step S604, obtaining the coil temperature of the indoor heat exchanger;

[0092] After determining the capacity phase region that characterizes the capacity of the air conditioner system, it is necessary to calculate the phase heat of the capacity phase region. During the specific calculation, it is necessary to obtain the coil temperature of the indoor heat exchanger.

[0093] Step S605, calculating the phase region heat of the power phase region.

[0094] During the specific calculation, the flow characteristics of the refrigerant in the refrigeration circuit are analyzed based on the mass flow rate, and the latent heat of the refrigerant is determined based on the coil temperature of the indoor heat exchanger. Then, the heat dissipated or absorbed in the phase area during the cooling or heating process of the air conditioner, that is, the phase heat, is determined accordingly.

[0095] Step S606: Calculate the operating capacity value of the controller according to the phase heat.

[0096] This application calculates the refrigerant flow rate based on operating parameters, determines the capacity phase region representing the air conditioner system's capacity based on the air conditioner's operating mode, calculates the heat in the capacity phase region based on the refrigeration circuit's operating parameters, the indoor heat exchanger's coil temperature, and the indoor heat exchanger's inlet and outlet temperatures, and thus calculates the air conditioning system's capacity. Without adding additional air conditioning system components, the application calculates the energy released by the refrigerant based on the system's operating status, thereby calculating the air conditioning system's capacity. This system is simple and highly accurate.

[0097] In another embodiment of the present invention, the controller is further configured to:

[0098] When the controller is in a cooling operation mode, determining that the capacity phase region of the controller includes a two-phase region and a superheat region;

[0099] When the controller is in a heating operation mode, it is determined that the capacity phase region of the controller includes a two-phase region, a superheating region, and a supercooling region.

[0100] When implementing this embodiment, see Figure 7 , is another flow chart of steps performed by the air conditioner according to an embodiment of the present invention. When determining the capability phase region representing the capability of the air conditioner system, the controller is further configured to perform the following steps:

[0101] Step S701, detecting the operating mode of the air conditioner;

[0102] Step S702, determining whether the air conditioner is in cooling operation mode;

[0103] If yes, go to step S703;

[0104] If not, execute step S704;

[0105] Step S703 , determining that the controller's capability phase region includes a two-phase region and an overheating region.

[0106] Step S704, determining whether the air conditioner is in a heating operation mode;

[0107] If yes, go to step S705;

[0108] If not, return to step S701;

[0109] Step S705 , determining that the controller's capability phase region includes a two-phase region, an overheating region, and a subcooling region.

[0110] When the air conditioner is in cooling mode, the heat absorbed by the refrigerant in the compressor is the capacity of the air conditioning system. After passing through the expansion valve, the refrigerant is a two-phase refrigerant. After absorbing a certain amount of indoor air heat, the refrigerant becomes a saturated gaseous refrigerant. Figure 8, is a schematic diagram of the refrigerant temperature change process provided by the embodiment of the present invention. The heat absorbed in this process is the two-phase heat, corresponding to the attached Figure 8 In the process of 6 to 7, the saturated gaseous refrigerant continues to absorb heat and becomes superheated refrigerant. The heat absorbed in this process is the heat in the superheated zone, corresponding to the attached Figure 8 In the process of 7 to 1, the heat absorbed by the refrigerant in the two-phase area and the superheated area is used as the cooling capacity. Therefore, the two-phase area and the superheated area are used as the capacity phase area. By calculating the heat in the capacity phase area, the capacity in the cooling operation mode is determined.

[0111] Figure 8 The horizontal axis s represents the entropy value of the refrigerant, and the vertical axis T represents the refrigerant temperature. Figure 8 The left side of the highest point of the parabola represents the TS curve of the saturated liquid of the refrigerant. Figure 8 The left side of the highest point of the parabola represents the TS curve of the saturated gas of the refrigerant.

[0112] When the air conditioner is in heating mode, the refrigerant discharged from the compressor is superheated refrigerant. The superheated refrigerant is cooled and becomes saturated gaseous refrigerant. The heat released in this process is the heat in the superheated zone, which corresponds to the attached Figure 8 In the process 2-3, the saturated gaseous refrigerant continues to release the latent heat of vaporization to become a saturated liquid refrigerant. The heat released in this process is the heat in the two-phase region, corresponding to the attached Figure 1 In the process 3-4, the saturated liquid refrigerant continues to release heat and becomes supercooled liquid refrigerant. The heat released in this process is the heat in the supercooling zone, corresponding to the attached Figure 8 In processes 4-5, the heat released by the refrigerant in the superheated, two-phase, and subcooled zones is used as the heating capacity. Therefore, the two-phase, subcooled, and superheated zones are considered the capacity phases. By calculating the heat in these phases, the capacity in heating mode is determined.

[0113] By analyzing the refrigerant working characteristics under the air conditioner operation mode, the corresponding capacity phase area is determined, and the capacity of the air conditioning system is accurately calculated.

[0114] In another embodiment provided by the present invention, the operating parameters include the operating frequency of the compressor and the speed of the indoor fan.

[0115] In this embodiment, the operating parameters include the compressor operating frequency and the indoor fan speed. By adding inlet and outlet temperature sensors to the indoor unit to detect the air inlet and outlet temperatures, combined with the fan speed and compressor operating frequency, the air enthalpy and air volume at the indoor unit's inlet and outlet are predicted, thereby accurately determining the air conditioning capacity.

[0116] In another embodiment of the present invention, the controller is further configured to:

[0117] When the controller is in cooling operation mode, the latent heat of vaporization value of the refrigerant is matched according to the coil temperature;

[0118] Calculating the two-phase heat of the refrigerant based on the latent heat of vaporization, the air inlet temperature of the indoor heat exchanger, the coil temperature, and the operating frequency of the compressor;

[0119] The heat of the superheated zone is calculated according to the indoor fan speed, the operating frequency, the air inlet temperature and the coil temperature.

[0120] When implementing this embodiment, see Figure 9 , is another flow chart of the steps performed by the air conditioner according to an embodiment of the present invention. When the controller calculates the system capacity of the air conditioner, it specifically performs the following steps:

[0121] Step S901: detecting the operating mode of the refrigeration circuit.

[0122] Step S902: Determine whether the operation mode is in the cooling operation mode.

[0123] If not, return to step S901.

[0124] If so, execute step S903.

[0125] Step S903: Acquire the coil temperature of the indoor heat exchanger.

[0126] Step S904: Match the latent heat of vaporization of the refrigerant according to the coil temperature.

[0127] It's important to note that the latent heat of vaporization is the amount of heat absorbed by a unit mass of a liquid substance during vaporization, while maintaining a constant temperature. This value is related to the current air pressure and temperature. In the confined space of a refrigeration circuit, these pressures and temperatures are actually correlated with the temperature. Therefore, the relationship between the refrigerant's latent heat of vaporization and temperature can be determined in advance. Once the coil temperature of the indoor heat exchanger is determined, the refrigerant's latent heat of vaporization can be determined accordingly.

[0128] Step S905, obtaining the air inlet temperature, coil temperature and compressor operating frequency of the indoor heat exchanger;

[0129] Step S906, calculate the two-phase heat of the refrigerant in the cooling operation mode, that is, calculate the two-phase heat of the refrigerant based on the latent heat of vaporization and mass flow rate of the refrigerant; the refrigerant becomes a two-phase refrigerant after passing through the throttling device, and the refrigerant becomes a saturated gaseous refrigerant after absorbing a certain amount of indoor air heat. The heat absorbed in this process is the two-phase heat.

[0130] Step S907, obtaining the indoor fan speed;

[0131] Step S908 calculates the superheated heat in the cooling mode. Specifically, the superheated heat is calculated based on the indoor fan speed, the operating frequency, the air inlet temperature, and the coil temperature. The saturated gaseous refrigerant continues to absorb heat, becoming superheated. The heat absorbed during this process is the superheated heat.

[0132] Step S909: Calculate the operating capacity value, that is, calculate the operating capacity value in the cooling operation mode based on the two-phase heat and the superheated heat.

[0133] The heat absorbed by the refrigerant in the two-phase region and the superheated region is used as the cooling capacity.

[0134] In another embodiment of the present invention, the controller is further configured to:

[0135] When the controller is in heating operation mode, the latent heat of vaporization of the refrigerant is matched according to the coil temperature;

[0136] Calculating the two-phase heat and the superheated heat of the refrigerant according to the operating frequency of the compressor, the outlet temperature of the indoor heat exchanger, the latent heat of vaporization, and the coil temperature;

[0137] The subcooling zone heat is calculated according to the indoor fan speed, the operating frequency, the air outlet temperature and the coil temperature.

[0138] When implementing this embodiment, see Figure 10 , is another flow chart of the steps performed by the air conditioner according to an embodiment of the present invention. When the controller calculates the system capacity of the air conditioner, it specifically performs the following steps:

[0139] Step S1001: Detect the operating mode of the refrigeration circuit.

[0140] Step S1002: determine whether the operation mode is in the heating operation mode.

[0141] If not, return to step S1001.

[0142] If so, execute step S1003.

[0143] Step S1003: Acquire the coil temperature of the indoor heat exchanger.

[0144] Step S1004: Match the latent heat of vaporization of the refrigerant according to the coil temperature.

[0145] It's important to note that the latent heat of vaporization is the amount of heat absorbed by a unit mass of a liquid substance during vaporization, while maintaining a constant temperature. This value is related to the current air pressure and temperature. In the confined space of a refrigeration circuit, these pressures and temperatures are actually correlated with the temperature. Therefore, the relationship between the refrigerant's latent heat of vaporization and temperature can be determined in advance. Once the coil temperature of the indoor heat exchanger is determined, the refrigerant's latent heat of vaporization can be determined accordingly.

[0146] Step S1005, obtaining the outlet temperature of the indoor heat exchanger, the coil temperature, and the operating frequency of the compressor;

[0147] Step S1006 calculates the two-phase heat capacity and superheat heat capacity of the refrigerant in the heating mode. This calculation is based on the refrigerant's latent heat of vaporization and mass flow rate. After passing through the throttling device, the refrigerant becomes a two-phase refrigerant. After absorbing a certain amount of indoor air heat, the refrigerant becomes a saturated gaseous refrigerant. The heat absorbed in this process is the two-phase heat capacity. The saturated gaseous refrigerant continues to absorb heat, becoming a superheated refrigerant. The heat absorbed in this process is the superheat heat capacity.

[0148] Step S1007, obtaining the indoor fan speed;

[0149] Step S1008 calculates the subcooling heat capacity in the heating mode. Specifically, the subcooling heat capacity is calculated based on the indoor fan speed, the operating frequency, the air outlet temperature, and the coil temperature. The saturated liquid refrigerant continues to release heat, becoming subcooled liquid refrigerant. The heat released during this process is the subcooling heat capacity.

[0150] Step S1009: Calculate the operating capacity value, that is, calculate the operating capacity value in the heating operation mode based on the two-phase area heat, the superheating area heat, and the supercooling area heat.

[0151] The heat released by the refrigerant in the superheat zone, two-phase zone and subcooling zone is used as heating capacity.

[0152] This application calculates the heat absorbed or energy released by the refrigerant according to the system operating status, and then calculates the air-conditioning system capacity. The system is simple and highly accurate.

[0153] In another embodiment provided by the present invention, the two-phase region heat

[0154] The heat of the superheated zone

[0155] Wherein, Fan is the indoor fan speed, Fre is the operating frequency, R incoil is the latent heat of vaporization, T incoil is the coil temperature, Ts is the air inlet temperature, QBc is the heat reference value of the refrigerant superheat zone, a 1c 、a 2c 、b 1c 、c 1c and n1 are preset constant values.

[0156] In the specific implementation of this embodiment, in the cooling operation mode, the temperature T in the middle of the indoor heat exchanger is detected. incoil , corresponding to the determination of the latent heat of vaporization R incoil .

[0157] According to the operating frequency Fre of the compressor, the air inlet temperature Ts, the latent heat of vaporization R incoil and coil temperature T incoil Calculation of two-phase heat in heating mode Calculation of two-phase heat in cooling mode

[0158] According to the indoor fan speed Fan, operating frequency Fre, air inlet temperature Ts and coil temperature T incoil Calculate the superheated area in cooling mode

[0159] Among them, a 1c 、a 2c 、b 1c 、c 1c and n1 are preset constant values, which can be determined by technicians according to the performance parameters of the air conditioner.

[0160] In another embodiment provided by the present invention, the two-phase region heat

[0161] The heat of the superheated zone

[0162] The heat of the supercooling zone

[0163] Wherein, Fan is the indoor fan speed, Fre is the operating frequency, R incoil is the latent heat of vaporization, T incoil is the coil temperature, Tp is the outlet temperature, Q B h is the heat reference value of the refrigerant supercooling zone, a1h, a 2h 、b 1h 、a 3h and n2 are preset constant values.

[0164] In the specific implementation of this embodiment, in the heating operation mode, the temperature T in the middle of the indoor heat exchanger is detected. incoil , corresponding to the determination of the latent heat of vaporization R incoil.

[0165] According to the operating frequency Fre of the compressor, the outlet temperature Tp, the latent heat of vaporization R lncoil and coil temperature T incoil Calculate the two-phase heat Q of the refrigerant in heating mode 1h And the heat of the superheated zone Q 2h .

[0166]

[0167]

[0168] According to the indoor fan speed Fan, compressor operating frequency Fre, outlet temperature Tp and coil temperature T incoil Calculate the subcooling heat Q of the refrigerant in heating mode 3h .

[0169]

[0170] Among them, a 1h 、a 2h 、b 1h 、a 3h and n2 are preset constant values, which can be determined by technicians according to the performance parameters of the air conditioner.

[0171] It should be noted that when the air conditioner is in the cooling operation mode and the heating operation mode, different preset constant values ​​can be determined accordingly according to the working characteristics of the air conditioner.

[0172] In another embodiment of the present invention, when the air conditioner is in cooling mode, the operating capacity value Q of the controller is c =a c *(Q 1c +Q2c);

[0173] Among them, a c is the proportional constant of the cooling operation mode, Q1 is the two-phase heat in the cooling operation mode, Q 2c It is the heat of superheat area in cooling operation mode.

[0174] In the specific implementation of this embodiment, in the cooling operation mode, the heat absorbed by the refrigerant in the two-phase region and the superheated region is used as the cooling capacity. Therefore, the operating capacity value Q of the controller is c =a c *(Q 1c +Q2c).

[0175] a c is the proportional constant of the cooling operation mode, Q1 is the two-phase heat in the cooling operation mode, Q2c It is the heat of superheat area in cooling operation mode.

[0176] In another embodiment of the present invention, when the air conditioner is in the heating operation mode, the operation capacity value Q of the controller is h =a h *(Q 1h +Q 2h +Q 3h );

[0177] Among them, a h is the proportional constant of the heating operation mode, Q 1h is the two-phase heat in the heating operation mode, Q 2h is the heat of the superheated zone in the heating operation mode, Q 3h It is the heat of the subcooling area in the heating operation mode.

[0178] In the specific implementation of this embodiment, in the heating operation mode, the heat released by the refrigerant in the superheated zone, the two-phase zone and the supercooled zone is used as the heating capacity. Therefore, the operating capacity value Q of the controller is h =a h *(Q 1h +Q 2h +Q 3h ).

[0179] a h is the proportional constant of the heating operation mode, Q 1h is the two-phase heat in the heating operation mode, Q 2h is the heat of the superheated zone in the heating operation mode, Q 3h It is the heat of the subcooling area in the heating operation mode.

[0180] This application calculates the energy released by the refrigerant according to the refrigerant side status without adding additional temperature sensors, and then calculates the air-conditioning system capacity. It is low-cost and accurate.

[0181] An embodiment of the present invention further provides a method for calculating the system capacity of an air conditioner, which is applied to an air conditioner, the air conditioner comprising:

[0182] a refrigeration circuit in which a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other serves as an evaporator;

[0183] a temperature sensor for detecting the coil temperature of the indoor heat exchanger;

[0184] a temperature detection device for detecting the inlet and outlet temperatures of the indoor heat exchanger;

[0185] Controller;

[0186] The method comprises:

[0187] Determining a capability phase region representing the capability of the air conditioner system according to the current operating mode of the air conditioner;

[0188] Obtaining the operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase heat of the refrigerant in the capacity phase region;

[0189] An operating capability value of the controller in a current operating mode is calculated according to the phase region heat.

[0190] This application calculates the refrigerant flow rate based on operating parameters, determines the capacity phase region representing the air conditioner system's capacity based on the air conditioner's operating mode, calculates the heat in the capacity phase region based on the refrigeration circuit's operating parameters, the indoor heat exchanger's coil temperature, and the indoor heat exchanger's inlet and outlet temperatures, and thus calculates the air conditioning system's capacity. Without adding additional air conditioning system components, the application calculates the energy released by the refrigerant based on the system's operating status, thereby calculating the air conditioning system's capacity. This system is simple and highly accurate.

[0191] It should be noted that the system capacity calculation method of an air conditioner provided in an embodiment of the present invention has the same process steps as those executed by the controller of an air conditioner in the above embodiment, and the working principles and beneficial effects of the two correspond one to one, so they will not be repeated here.

[0192] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0193] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that: include: a refrigeration circuit in which a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other serves as an evaporator; a temperature sensor for detecting the coil temperature of the indoor heat exchanger; a temperature detection device for detecting the inlet and outlet temperatures of the indoor heat exchanger; The controller is configured as: Determining a capability phase region representing the capability of the air conditioner system according to the current operating mode of the air conditioner; Obtaining the operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase heat of the refrigerant in the capacity phase region; An operating capability value of the controller in a current operating mode is calculated according to the phase region heat.

2. The air conditioner according to claim 1, wherein The controller is further configured to: When the controller is in a cooling operation mode, determining that the capacity phase region of the controller includes a two-phase region and a superheat region; When the controller is in a heating operation mode, it is determined that the capacity phase region of the controller includes a two-phase region, a superheating region, and a supercooling region.

3. The air conditioner according to claim 1, wherein The operating parameters include the operating frequency of the compressor and the speed of the indoor fan.

4. The air conditioner according to claim 2, wherein: The controller is further configured to: When the controller is in cooling operation mode, the latent heat of vaporization value of the refrigerant is matched according to the coil temperature; Calculating the two-phase heat of the refrigerant based on the latent heat of vaporization, the air inlet temperature of the indoor heat exchanger, the coil temperature, and the operating frequency of the compressor; The heat of the superheated zone is calculated according to the indoor fan speed, the operating frequency, the air inlet temperature and the coil temperature.

5. The air conditioner according to claim 2, wherein: The controller is further configured to: When the controller is in heating operation mode, the latent heat of vaporization of the refrigerant is matched according to the coil temperature; Calculating the two-phase heat and the superheated heat of the refrigerant according to the operating frequency of the compressor, the outlet temperature of the indoor heat exchanger, the latent heat of vaporization, and the coil temperature; The subcooling zone heat is calculated according to the indoor fan speed, the operating frequency, the air outlet temperature and the coil temperature.

6. The air conditioner according to claim 4, wherein: The two-phase region heat The heat of the superheated zone Wherein, Fan is the indoor fan speed, Fre is the operating frequency, R incoil is the latent heat of vaporization, T incoil is the coil temperature, Ts is the air inlet temperature, Q Bc is the heat reference value of the refrigerant superheat zone, a 1c 、a 2c 、b 1c 、c 1c and n1 are preset constant values.

7. The air conditioner according to claim 5, wherein The two-phase region heat The heat of the superheated zone The heat of the supercooling zone Wherein, Fan is the indoor fan speed, Fre is the operating frequency, R incoil is the latent heat of vaporization, T incoil is the coil temperature, Tp is the outlet temperature, Q B h is the heat reference value of the refrigerant supercooling zone, a 1h 、a 2h 、b 1h 、a 3h and n2 are preset constant values.

8. The air conditioner according to claim 2, wherein: When the air conditioner is in cooling mode, the controller's operating capacity value Q c =a c *(Q 1c +Q2c); Among them, a c is the proportional constant of the cooling operation mode, Q 1c is the two-phase heat in the cooling operation mode, Q 2c It is the heat of superheat area in cooling operation mode.

9. The air conditioner according to claim 2, wherein: When the air conditioner is in the heating mode, the controller's operating capacity value Q h =a h *(Q 1h +Q 2h +Q 3h ); Among them, a h is the proportional constant of the heating operation mode, Q 1h is the two-phase heat in the heating operation mode, Q 2h is the heat of the superheated zone in the heating operation mode, Q 3h It is the heat of the subcooling area in the heating operation mode.

10. A method for calculating the system capacity of an air conditioner, characterized in that: The air conditioner comprises: a refrigeration circuit in which a refrigerant circulates sequentially through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein one of the outdoor heat exchanger and the indoor heat exchanger serves as a condenser and the other serves as an evaporator; a temperature sensor for detecting the coil temperature of the indoor heat exchanger; a temperature detection device for detecting the inlet and outlet temperatures of the indoor heat exchanger; Controller; The method comprises: Determining a capability phase region representing the capability of the air conditioner system according to the current operating mode of the air conditioner; Obtaining the operating parameters of the air conditioner refrigeration circuit, the coil temperature of the indoor heat exchanger, and the inlet and outlet temperatures of the indoor heat exchanger to calculate the phase heat of the refrigerant in the capacity phase region; An operating capability value of the controller in a current operating mode is calculated according to the phase region heat.

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