Air conditioner and capacity calculation method thereof

Abstract

The invention provides an air conditioner and a capacity calculation method thereof, and the air conditioner comprises a controller which is configured to obtain an operation mode of the air conditioner, an input voltage of a compressor, an input current of the compressor, an operation frequency of the compressor, and a first inlet enthalpy value, a first outlet enthalpy value, a second inlet enthalpy value and a second outlet enthalpy value of an outdoor heat exchanger; the power of the compressor and the mass flow of the air conditioner are determined according to the parameters; when the air conditioner is in a refrigerating mode, the refrigerating capacity of the air conditioner is determined according to the power, the mass flow rate, the first inlet enthalpy value, the first outlet enthalpy value and a refrigerating capacity calculation formula of the compressor; when the air conditioner is in the heating mode, the heating capacity of the air conditioner is determined according to the power, the mass flow rate, the second inlet enthalpy value, the second outlet enthalpy value and the heating capacity calculation formula of the compressor, the problem that the air enthalpy value is greatly influenced by the outdoor environment is avoided, the hardware occupied space and the hardware cost of the air conditioner are reduced, and the air conditioner heating capacity is improved. And the accuracy of air conditioner capacity calculation is improved.

Description

Technical Field

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

[0002] Since air conditioners must have a capacity calculation function, and air conditioners without this function are not allowed to be sold in some regions and countries, currently, air conditioners detect the temperature and pressure of the evaporator inlet and outlet to determine the inlet enthalpy and outlet enthalpy of the evaporator to calculate the air conditioner capacity based on the enthalpy difference method; or detect the inlet and outlet air enthalpy values ​​of the air conditioner and calculate the air conditioner capacity by the enthalpy difference method.

[0003] However, the above method requires adding additional devices to the air conditioner, which occupies the internal space of the air conditioner, and the device structure is complex, resulting in a higher cost of the air conditioner. In particular, the inlet and outlet air enthalpy values ​​are greatly affected by the ambient temperature, and the installation position and detection accuracy requirements of the detection device are high, further increasing the cost of the air conditioner. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, one object of the present invention is to propose an air conditioner, which uses existing outdoor equipment to detect the inlet and outlet enthalpy values ​​on the outdoor side, without the need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, the accuracy of the air conditioner capacity calculation is improved while reducing the hardware space occupied and hardware cost of the air conditioner.

[0006] To this end, a second object of the present invention is to provide a method for calculating the capacity of an air conditioner.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes an air conditioner, which includes: a refrigerant circulation loop, which allows the refrigerant to circulate in the circulation loop among a compressor, a condenser, an expansion valve and an evaporator; a compressor, which is used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; an outdoor heat exchanger, which performs heat exchange between the refrigerant flowing inside and the air; a controller, which is configured to: obtain the operating mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, the operating frequency of the compressor, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger; and obtain the operating mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, the operating frequency of the compressor, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger according to the compressor ... input current of the compressor, the input current of the compressor, the first inlet enthalpy value, the first The power of the compressor is determined according to the input voltage of the compressor, the input current of the compressor and the power calculation formula of the compressor; the mass flow rate of the air conditioner is determined according to the operating frequency of the compressor and the mass flow calculation formula of the air conditioner; when the air conditioner is in cooling mode, the cooling capacity of the air conditioner is determined according to the power of the compressor, the mass flow rate, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger and the cooling capacity calculation formula of the air conditioner; when the air conditioner is in heating mode, the heating capacity of the air conditioner is determined according to the power of the compressor, the mass flow rate, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

[0008] According to the air conditioner of the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, the existing device on the outdoor side is used to detect the inlet and outlet enthalpy values, such as the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger, and the real-time capacity of the air conditioner under different operating modes is calculated in combination with the operating mode of the air conditioner, the power of the compressor and the mass flow rate of the air conditioner. The inlet and outlet enthalpy values ​​on the outdoor side are detected by the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner, the accuracy of the air conditioner capacity calculation is improved.

[0009] In some embodiments, the air conditioner also includes: a first coil temperature sensor for detecting the first coil temperature of the outdoor heat exchanger; when obtaining the first inlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the first coil temperature, the first saturation pressure corresponding to the first coil temperature, and the first temperature correction value; determine the first inlet enthalpy value based on the first coil temperature, the first saturation pressure and the first temperature correction value.

[0010] In some embodiments, when obtaining the first outlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the first coil temperature, the first saturated pressure and the second temperature correction value; determine the first outlet enthalpy value based on the first coil temperature, the first saturated pressure and the second temperature correction value.

[0011] In some embodiments, the air conditioner also includes: a second coil temperature sensor for detecting the second coil temperature of the outdoor heat exchanger; when obtaining the second inlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the second coil temperature, the second saturation pressure corresponding to the second coil temperature and the third temperature correction value; determine the second inlet enthalpy value according to the second coil temperature, the second saturation pressure and the third temperature correction value.

[0012] In some embodiments, when obtaining the second outlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the second coil temperature, the second saturated pressure corresponding to the second coil temperature, and a fourth temperature correction value; determine the second outlet enthalpy value based on the second coil temperature, the second saturated pressure, and the fourth temperature correction value.

[0013] In some embodiments, the power calculation formula of the compressor includes:

[0014] W=η*U*I

[0015] Wherein, W is the power of the compressor, U is the input voltage of the compressor, I is the input current of the compressor, and η is the efficiency coefficient of the compressor.

[0016] In some embodiments, the mass flow calculation formula of the air conditioner includes:

[0017] qm=C1*Q y *H*ρ

[0018] Wherein, qm is the mass flow rate, C1 is the mass flow rate correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor, and Q y is the preset compressor displacement.

[0019] In some embodiments, the refrigeration capacity calculation formula includes:

[0020] C c =|hin1-hout1|×C1*Q y *H*ρ-η*U*I

[0021] Wherein, hin1 is the first inlet enthalpy value, hout1 is the first outlet enthalpy value, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor, and Q y is the preset compressor displacement, U is the input voltage of the compressor, I is the input current of the compressor, and η is the compressor efficiency coefficient.

[0022] The heating capacity calculation formula includes:

[0023] C h =|hin2-hout2|×C1*Q y *H*ρ-η*U*I

[0024] Wherein, hin2 is the second inlet enthalpy value, hout2 is the second outlet enthalpy value, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor, and Q y is the preset compressor displacement, U is the input voltage of the compressor, I is the input current of the compressor, and η is the compressor efficiency coefficient.

[0025] In some embodiments, the controller is further configured to: send the cooling capacity or heating capacity to a user terminal and / or display it on a display screen of the air conditioner.

[0026] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a capacity calculation method for an air conditioner, the method comprising: obtaining an operating mode of the air conditioner, an input voltage of the compressor, an input current of the compressor, an operating frequency of the compressor, a first inlet enthalpy value, a first outlet enthalpy value, a second inlet enthalpy value and a second outlet enthalpy value of an outdoor heat exchanger; determining the power of the compressor according to the input voltage of the compressor, the input current of the compressor and a power calculation formula of the compressor; determining the mass flow of the air conditioner according to the operating frequency of the compressor and a mass flow calculation formula of the air conditioner; when the air conditioner is in a cooling mode, determining the cooling capacity of the air conditioner according to the power of the compressor, the mass flow, the first inlet enthalpy value, the first outlet enthalpy value of the outdoor heat exchanger and a cooling capacity calculation formula of the air conditioner; when the air conditioner is in a heating mode, determining the heating capacity of the air conditioner according to the power of the compressor, the mass flow, the second inlet enthalpy value, the second outlet enthalpy value of the outdoor heat exchanger and a heating capacity calculation formula of the air conditioner.

[0027] According to the capacity calculation method of the air conditioner in the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, the existing device on the outdoor side is used to detect the inlet and outlet enthalpy values, such as the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger, and the real-time capacity of the air conditioner under different operating modes is calculated in combination with the operating mode of the air conditioner, the power of the compressor, and the mass flow rate of the air conditioner. The inlet and outlet enthalpy values ​​on the outdoor side are detected by the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, the accuracy of the air conditioner capacity calculation is improved while reducing the hardware space occupied and the hardware cost of the air conditioner.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 is a structural schematic diagram of an air conditioner according to an embodiment of the present invention;

[0031] Figure 2 is a flow chart of a method for calculating the cooling capacity of an air conditioner according to an embodiment of the present invention;

[0032] Figure 3 is a flow chart of a method for calculating the heating capacity of an air conditioner according to an embodiment of the present invention;

[0033] Figure 4 is a structural schematic diagram of an air conditioner according to a specific embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of the pressure enthalpy of the refrigerant cycle of an air conditioner according to an embodiment of the present invention;

[0035] Figure 6 is a flow chart of a method for calculating the capacity of an air conditioner according to an embodiment of the present invention;

[0036] Figure 7 is a flow chart of a method for calculating the capacity of an air conditioner according to an embodiment of the present invention.

[0037] Reference numerals: air conditioner 1;

[0038] Refrigerant circulation loop 11 ; compressor 12 ; outdoor heat exchanger 13 ; controller 14 ; first coil temperature sensor 15 ; second coil temperature sensor 16 . DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0040] The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0041] The compressor compresses the refrigerant gas in a high temperature and high pressure state 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.

[0042] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-temperature and low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0043] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0044] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0045] Reference below Figure 1-Figure 6 An air conditioner 1 according to an embodiment of the present invention will be described.

[0046] like Figure 1 As shown, the air conditioner 1 of the embodiment of the present invention comprises: a refrigerant circulation loop 11, a compressor 12, an outdoor heat exchanger 13 and a controller 14, wherein:

[0047] The refrigerant circulation loop 11 allows the refrigerant to circulate in the compressor 12, the condenser, the expansion valve and the evaporator in the circulation loop; the compressor 12 is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the outdoor heat exchanger 13 performs heat exchange between the refrigerant flowing inside and the air; the controller 14 is configured to: obtain the operating mode of the air conditioner 1, the input voltage of the compressor 12, the input current of the compressor 12, the operating frequency of the compressor 12, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger 13; according to the input voltage of the compressor 12, the input current of the compressor 12, the operating frequency of the compressor 12, the first inlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger 13 The power of the compressor 12 is determined according to the input current of the compressor 12 and the power calculation formula of the compressor 12; the mass flow rate of the air conditioner 1 is determined according to the operating frequency of the compressor 12 and the mass flow calculation formula of the air conditioner 1; when the air conditioner 1 is in the cooling mode, the cooling capacity of the air conditioner 1 is determined according to the power of the compressor 12, the mass flow rate, the first inlet enthalpy value of the outdoor heat exchanger 13, the first outlet enthalpy value and the cooling capacity calculation formula of the air conditioner 1; when the air conditioner 1 is in the heating mode, the heating capacity of the air conditioner 1 is determined according to the power of the compressor 12, the mass flow rate, the second inlet enthalpy value of the outdoor heat exchanger 13, the second outlet enthalpy value and the heating capacity calculation formula of the air conditioner 1.

[0048] In an embodiment, after the air conditioner 1 is turned on and operated, the controller 14 obtains the operating mode of the air conditioner 1 in real time, and the operating mode includes, for example, a cooling operating mode and a heating operating mode; because the input voltage, input current and operating frequency of the compressor 12 will change when the compressor 12 compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharges it to the condenser, the input voltage of the compressor 12 is obtained in real time, for example, recorded as U, the input current of the compressor 12 is obtained, for example, recorded as I, and the operating frequency of the compressor 12 is obtained, for example, recorded as H; because the inlet and outlet enthalpy values ​​of the outdoor heat exchanger 13 will change when heat is exchanged between the refrigerant flowing inside and the air, the first inlet enthalpy value of the outdoor heat exchanger 13 is obtained, for example, recorded as hin1, the first outlet enthalpy value is obtained, for example, recorded as hout1, the second inlet enthalpy value is obtained, for example, recorded as hin2, and the second outlet enthalpy value is obtained, for example, recorded as hout2.

[0049] After obtaining the above parameters, the input voltage U of compressor 12 and the input current I of compressor 12 are substituted into the power calculation formula of compressor 12 to determine the operating power of compressor 12, for example, recorded as W; the operating frequency H of compressor 12 is substituted into the mass flow calculation formula of air conditioner 1 to determine the mass flow of air conditioner 1, for example, recorded as qm.

[0050] After determining the mass flow rate qm of the air conditioner 1, the capacity calculation formula of the air conditioner 1 is used in combination with the above parameters to determine the capacity of the air conditioner 1 corresponding to different operating modes. For example, when the operating mode of the air conditioner 1 is in the cooling operating mode, the outdoor heat exchanger 13 is used as a condenser, and the power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the first inlet enthalpy value hin1 of the outdoor heat exchanger 13, and the first outlet enthalpy value hout1 are brought into the refrigeration capacity calculation formula of the air conditioner 1 to determine the refrigeration capacity of the air conditioner 1, for example, recorded as C c When the operation mode of the air conditioner 1 is in the heating operation mode, the outdoor heat exchanger 13 is used as an evaporator, and the power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the second inlet enthalpy value hin2 of the outdoor heat exchanger 13, and the second outlet enthalpy value hout2 are brought into the heating capacity calculation formula of the air conditioner 1 to determine the heating capacity of the air conditioner 1, for example, recorded as C h , to determine the real-time capability of the air conditioner 1 under different operating modes.

[0051] Reference below Figure 2 A method for calculating the cooling capacity of an air conditioner according to an embodiment of the present invention is described.

[0052] Step S11, the air conditioner is turned on and operated.

[0053] Step S121, obtaining the operation mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, the operation frequency of the compressor, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger.

[0054] Step S23, determining whether the air conditioner is in cooling operation mode, if so, executing step S25; otherwise, executing step S121.

[0055] Step S25, determining the cooling capacity of the air conditioner according to the power of the compressor, the mass flow rate, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger and the cooling capacity calculation formula of the air conditioner.

[0056] Reference below Figure 3 A method for calculating the heating amount of an air conditioner according to an embodiment of the present invention is described.

[0057] Step S11, the air conditioner is turned on and operated.

[0058] Step S121, obtaining the operation mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, the operation frequency of the compressor, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger.

[0059] Step S23, determining whether the air conditioner is in cooling operation mode, if so, executing step S121; otherwise, executing step S24.

[0060] Step S24, determining the heating capacity of the air conditioner according to the power and mass flow of the compressor, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

[0061] According to the air conditioner 1 of the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, after the air conditioner 1 is turned on and operated, the existing device on the outdoor side is used to detect the inlet and outlet enthalpy values, such as the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger 13, and the real-time capacity of the air conditioner 1 under different operating modes is calculated in combination with the operating mode of the air conditioner 1, the power of the compressor 12, and the mass flow rate of the air conditioner 1. The inlet and outlet enthalpy values ​​on the outdoor side are detected by the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner 1, the accuracy of the capacity calculation of the air conditioner 1 is improved.

[0062] In some embodiments, the air conditioner 1 also includes: a first coil temperature sensor 15, which is used to detect the first coil temperature of the outdoor heat exchanger 13; when obtaining the first inlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the first coil temperature, the first saturation pressure corresponding to the first coil temperature, and the first temperature correction value; determine the first inlet enthalpy value according to the first coil temperature, the first saturation pressure and the first temperature correction value.

[0063] In an embodiment, Figure 4 FIG. 1 is a schematic diagram of the structure of an air conditioner according to a specific embodiment of the present invention. The air conditioner 1 further comprises: a first coil temperature sensor 15 , wherein the first coil temperature sensor 15 is used to detect the temperature of the first coil of the outdoor heat exchanger 13 .

[0064] The controller 14 obtains the first coil temperature in real time according to the first coil temperature sensor 15, for example, recorded as TI, obtains the first temperature correction value preset in the controller 14 according to engineering test experience, for example, recorded as Tx1, and obtains the first saturation pressure corresponding to the first coil temperature TI, for example, recorded as PI, so as to correct the first coil temperature TI according to the first temperature correction value Tx1, that is, the corrected first coil temperature is TI+Tx1, so as to jointly determine the corresponding first inlet enthalpy value hin1 according to the fitting relationship between the corrected first coil temperature TI+Tx1 and the first saturation pressure PI.

[0065] For example Figure 5The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected first coil temperature TI+Tx1 and the first saturation pressure PI are introduced into Figure 5 The midpoint 2 of the curve is the intersection of the corrected first coil temperature TI+Tx1 and the first saturation pressure PI, that is, P2=PI, T2=TI+Tx1, and the enthalpy value corresponding to this point is determined to be the first inlet enthalpy value hin1.

[0066] In some embodiments, when obtaining the first outlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the first coil temperature, the first saturation pressure and the second temperature correction value; determine the first outlet enthalpy value according to the first coil temperature, the first saturation pressure and the second temperature correction value.

[0067] In an embodiment, the controller 14 obtains the first coil temperature in real time according to the first coil temperature sensor 15, for example, recorded as TI, obtains the second temperature correction value preset in the controller 14 according to engineering test experience, for example, recorded as Tx2, and obtains the first saturation pressure corresponding to the first coil temperature TI, for example, recorded as PI, so as to correct the first coil temperature TI according to the second temperature correction value Tx2, that is, the corrected first coil temperature is TI+Tx2, so that the corresponding first outlet enthalpy value hout1 is jointly determined according to the fitting relationship between the corrected first coil temperature TI+Tx2 and the first saturation pressure PI.

[0068] For example Figure 5 The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected first coil temperature TI+Tx2 and the first saturation pressure PI are introduced into Figure 5 The midpoint 4 of the curve is the intersection of the corrected first coil temperature TI+Tx2 and the first saturation pressure PI, that is, P4=P2=PI, T4=TI+Tx2, and the enthalpy value corresponding to this point is determined to be the first outlet enthalpy value hout1.

[0069] In some embodiments, the air conditioner 1 also includes: a second coil temperature sensor 16, which is used to detect the second coil temperature of the outdoor heat exchanger 13; when obtaining the second inlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the second coil temperature, the second saturated pressure corresponding to the second coil temperature and the third temperature correction value; determine the second inlet enthalpy value according to the second coil temperature, the second saturated pressure and the third temperature correction value.

[0070] In an embodiment, in an embodiment, as Figure 4FIG. 1 is a schematic diagram of the structure of an air conditioner according to a specific embodiment of the present invention. The air conditioner 1 further comprises a second coil temperature sensor 16 , wherein the second coil temperature sensor 16 is used to detect the temperature of the second coil of the outdoor heat exchanger 13 .

[0071] The controller 14 obtains the second coil temperature in real time according to the second coil temperature sensor 16, for example, recorded as TI, obtains the third temperature correction value preset in the controller 14 according to engineering test experience, for example, recorded as Tx3, and obtains the second saturation pressure corresponding to the second coil temperature TI, for example, recorded as PI, so as to correct the second coil temperature TI according to the third temperature correction value Tx3, that is, TI+Tx3, so as to jointly determine the corresponding second inlet enthalpy value hin2 according to the fitting relationship between the corrected second coil temperature TI+Tx3 and the second saturation pressure PI.

[0072] For example Figure 5 The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected second coil temperature TI+Tx3 and the second saturation pressure PI are brought into Figure 5 The midpoint 5 of the curve is the intersection of the corrected second coil temperature TI+Tx3 and the second saturation pressure PI, that is, P5=PI, T5=TI+Tx3, and the enthalpy value corresponding to this point is determined to be the second inlet enthalpy value hin2.

[0073] In some embodiments, when obtaining the second outlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the second coil temperature, the second saturated pressure corresponding to the second coil temperature, and the fourth temperature correction value; determine the second outlet enthalpy value based on the second coil temperature, the second saturated pressure, and the fourth temperature correction value.

[0074] In an embodiment, the controller 14 obtains the second coil temperature in real time according to the second coil temperature sensor 16, for example, recorded as TI, obtains the fourth temperature correction value preset in the controller 14 according to engineering test experience, for example, recorded as Tx4, and obtains the second saturation pressure corresponding to the second coil temperature TI, for example, recorded as PI, so as to correct the second coil temperature TI according to the fourth temperature correction value Tx4, that is, TI+Tx4, so as to jointly determine the corresponding second outlet enthalpy value hout2 according to the fitting relationship between the corrected second coil temperature TI+Tx4 and the second saturation pressure PI.

[0075] For example Figure 5 The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected second coil temperature TI+Tx4 and the second saturation pressure PI are brought into Figure 5The midpoint 1 of the curve is the intersection of the corrected second coil temperature TI+Tx4 and the second saturation pressure PI, that is, P1=PI, T1=TI+Tx4, and the enthalpy value corresponding to this point is determined to be the second outlet enthalpy value hout2.

[0076] In some embodiments, the power calculation formula of the compressor 12 includes:

[0077] W=η*U*I

[0078] Wherein, W is the power of the compressor 12, U is the input voltage of the compressor 12, I is the input current of the compressor 12, and η is the compressor efficiency coefficient.

[0079] In the embodiment, after obtaining the input voltage U of the compressor 12 and the input current I of the compressor 12, the compressor efficiency coefficient preset in the controller 14 is obtained, for example, recorded as η, and the above parameters are substituted into the power calculation formula of the compressor 12. The power calculation formula of the compressor 12 is as follows:

[0080] W=η*U*I

[0081] The compressor efficiency coefficient η is a correction coefficient preset in the controller 14 according to the model of the compressor 12 and the type of refrigerant.

[0082] By calculating the operating power W of the compressor 12 , the real-time capacity of the air conditioner 1 is calculated according to the operating power W of the compressor 12 .

[0083] In some embodiments, the mass flow calculation formula of the air conditioner 1 includes:

[0084] qm=C1*Q y *H*ρ

[0085] Wherein, qm is the mass flow rate, C1 is the mass flow rate correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor 12, Q y is the preset compressor displacement.

[0086] In the embodiment, after obtaining the operating frequency H of the compressor 12, the mass flow correction coefficient C1 and the preset compressor displacement Q preset in the controller 14 according to engineering test experience are obtained. y and refrigerant density ρ, the above parameters are substituted into the mass flow calculation formula of air conditioner 1, and the mass flow calculation formula of air conditioner 1 is as follows:

[0087] qm=C1*Q y *H*ρ

[0088] By calculating the mass flow rate qm of the air conditioner 1 , the real-time capacity of the air conditioner 1 is calculated according to the mass flow rate qm of the air conditioner 1 .

[0089] Among them, the mass flow correction coefficient C1, the preset compressor displacement Q y and refrigerant density ρ are correction coefficients and preset values ​​preset in the controller 14 according to the model of the compressor 12 and the type of refrigerant.

[0090] In some embodiments, the cooling capacity calculation formula includes:

[0091] C c =|hin1-hout1|×C1*Q y *H*ρ-η*U*I

[0092] Wherein, hin1 is the first inlet enthalpy value, hout1 is the first outlet enthalpy value, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor 12, Q y is the preset compressor displacement, U is the input voltage of the compressor 12, I is the input current of the compressor 12, and η is the compressor efficiency coefficient.

[0093] In the embodiment, after obtaining the power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the first inlet enthalpy value hin1 of the outdoor heat exchanger 13, and the first outlet enthalpy value hout1, the above parameters are substituted into the cooling capacity calculation formula to obtain the cooling capacity C of the air conditioner 1 c , the cooling capacity calculation formula is as follows:

[0094] C c =|hin1-hout1|×qm-W=|hin1-hout1|×C1*Q y *H*ρ-η*U*I

[0095] By calculating the cooling capacity C of air conditioner 1 c , determine the real-time capacity of the air conditioner 1 when it is in cooling mode.

[0096] In some embodiments, the heating capacity calculation formula includes:

[0097] C h =|hin2-hout2|×C1*Q y *H*ρ+η*U*I

[0098] Wherein, hin2 is the second inlet enthalpy value, hout2 is the second outlet enthalpy value, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor 12, Q y is the preset compressor displacement, U is the input voltage of the compressor 12, I is the input current of the compressor 12, and η is the compressor efficiency coefficient.

[0099] In the embodiment, after obtaining the power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the second inlet enthalpy value hin2 of the outdoor heat exchanger 13, and the second outlet enthalpy value hout2, the above parameters are substituted into the heating capacity calculation formula to obtain the heating capacity C of the air conditioner 1 h , the heating capacity calculation formula is as follows:

[0100] C h =|hin2-hout2|×qm+W=|hin2-hout2|×C1*Q y *H*ρ+η*U*I

[0101] By calculating the heating capacity C of air conditioner 1 h , determine the real-time capacity of the air conditioner 1 when it is in heating mode.

[0102] By calculating the cooling capacity C of air conditioner 1 c and heating capacity C h , thereby determining the real-time capability of the air conditioner 1 under different operating modes.

[0103] In some embodiments, the controller 14 is further configured to: send the cooling capacity or heating capacity to a user terminal and / or display it on a display screen of the air conditioner 1 .

[0104] In the embodiment, the cooling capacity C of the air conditioner 1 is obtained. c or heating capacity C h Afterwards, the controller 14 sets the cooling capacity C c or heating capacity C h It is sent to a user terminal such as a mobile phone APP, and / or sent to the display screen of the air conditioner 1 for display, so that the user can understand the real-time status of the air conditioner 1.

[0105] Reference below Figure 6 The capacity calculation method of the air conditioner according to the embodiment of the present invention is described by way of example.

[0106] like Figure 6 As shown, the capacity calculation method of the air conditioner according to the embodiment of the present invention at least includes steps S11 to S26.

[0107] Step S11, the air conditioner is turned on and operated.

[0108] Step S12, obtaining the operation mode of the air conditioner, the input voltage of the compressor, the input current of the compressor and the operation frequency of the compressor.

[0109] Step S13, obtaining a first coil temperature, a first saturation pressure corresponding to the first coil temperature, and a first temperature correction value.

[0110] Step S14, determining a first inlet enthalpy value according to the first coil temperature, the first saturation pressure and the first temperature correction value.

[0111] Step S15, obtaining the first coil temperature, the first saturation pressure and the second temperature correction value.

[0112] Step S16, determining a first outlet enthalpy value according to the first coil temperature, the first saturation pressure and the second temperature correction value.

[0113] Step S17, obtaining the second coil temperature, the second saturation pressure corresponding to the second coil temperature, and the third temperature correction value.

[0114] Step S18, determining a second inlet enthalpy value according to the second coil temperature, the second saturation pressure and the third temperature correction value.

[0115] Step S19, obtaining the second coil temperature, the second saturation pressure corresponding to the second coil temperature, and the fourth temperature correction value.

[0116] Step S20, determining a second outlet enthalpy value according to the second coil temperature, the second saturation pressure and the fourth temperature correction value.

[0117] Step S21, determining the power of the compressor according to the input voltage of the compressor, the input current of the compressor and the power calculation formula of the compressor.

[0118] Step S22, determining the mass flow of the air conditioner according to the operating frequency of the compressor and the mass flow calculation formula of the air conditioner.

[0119] Step S23, determining whether the air conditioner is in cooling operation mode, if so, executing step S25; otherwise, executing step S24.

[0120] Step S24, determining the heating capacity of the air conditioner according to the power and mass flow of the compressor, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

[0121] Step S25, determining the cooling capacity of the air conditioner according to the power of the compressor, the mass flow rate, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger and the cooling capacity calculation formula of the air conditioner.

[0122] Step S26, sending the cooling capacity or heating capacity to the user terminal and / or displaying it on the display screen of the air conditioner.

[0123] According to the air conditioner 1 of the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, after the air conditioner 1 is turned on and operated, the existing device on the outdoor side is used to detect the inlet and outlet enthalpy values, such as the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger 13, and the real-time capacity of the air conditioner 1 under different operating modes is calculated in combination with the operating mode of the air conditioner 1, the power of the compressor 12, and the mass flow rate of the air conditioner 1. The inlet and outlet enthalpy values ​​on the outdoor side are detected by the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner 1, the accuracy of the capacity calculation of the air conditioner 1 is improved.

[0124] Reference below Figure 7 A method for calculating the capacity of an air conditioner according to an embodiment of the present invention is described.

[0125] like Figure 7 As shown, the capacity calculation method of the air conditioner according to the embodiment of the present invention at least includes steps S1 to S4.

[0126] Step S1, obtaining the operation mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, the operation frequency of the compressor, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger.

[0127] The operation mode includes, for example, a cooling operation mode and a heating operation mode.

[0128] In an embodiment, after the air conditioner is turned on, the controller obtains the operating mode of the air conditioner in real time, and the operating mode includes, for example, a cooling operating mode and a heating operating mode; because the input voltage, input current and operating frequency of the compressor will change when the compressor compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharges it to the condenser, the input voltage of the compressor, for example, U, the input current of the compressor, for example, I, and the operating frequency of the compressor, for example, H, are obtained in real time; because the inlet and outlet enthalpy values ​​of the outdoor heat exchanger will change when heat is exchanged between the refrigerant flowing inside and the air, the first inlet enthalpy value of the outdoor heat exchanger, for example, hin1, the first outlet enthalpy value, for example, hout1, the second inlet enthalpy value, for example, hin2, and the second outlet enthalpy value, for example, hout2, are obtained.

[0129] Step S2, determining the power of the compressor according to the input voltage of the compressor, the input current of the compressor and the power calculation formula of the compressor.

[0130] In an embodiment, after obtaining the above parameters, the input voltage U of the compressor and the input current I of the compressor are substituted into the power calculation formula of the compressor to determine the operating power of the compressor, for example, recorded as W.

[0131] Step S3, determining the mass flow of the air conditioner according to the operating frequency of the compressor and the mass flow calculation formula of the air conditioner.

[0132] In an embodiment, after obtaining the above parameters, the operating frequency H of the compressor is substituted into the mass flow calculation formula of the air conditioner to determine the mass flow of the air conditioner, for example, recorded as qm.

[0133] Step S4, when the air conditioner is in cooling mode, the cooling capacity of the air conditioner is determined according to the power of the compressor, mass flow, the first inlet enthalpy value, the first outlet enthalpy value of the outdoor heat exchanger and the cooling capacity calculation formula of the air conditioner; when the air conditioner is in heating mode, the heating capacity of the air conditioner is determined according to the power of the compressor, mass flow, the second inlet enthalpy value, the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

[0134] In an embodiment, after determining the mass flow rate qm of the air conditioner, the capacity calculation formula of the air conditioner is used and combined with the above parameters to determine the capacity of the air conditioner corresponding to different operating modes. For example, when the operating mode of the air conditioner is in the cooling operation mode, the outdoor heat exchanger is used as a condenser, and the cooling capacity of the air conditioner is determined according to the power W of the compressor, the mass flow rate qm of the air conditioner, the first inlet enthalpy value hin1 of the outdoor heat exchanger, the first outlet enthalpy value hout1 and the cooling capacity calculation formula of the air conditioner; when the operating mode of the air conditioner is in the heating operation mode, the outdoor heat exchanger is used as an evaporator, and the heating capacity of the air conditioner is determined according to the power W of the compressor, the mass flow rate qm of the air conditioner, the second inlet enthalpy value hin2 of the outdoor heat exchanger, the second outlet enthalpy value hout2 and the heating capacity calculation formula of the air conditioner, so as to determine the real-time capacity of the air conditioner under different operating modes.

[0135] According to the capacity calculation method of the air conditioner in the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, after the air conditioner is turned on and operated, the existing device on the outdoor side is used to detect the inlet and outlet enthalpy values, such as the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger, and the real-time capacity of the air conditioner under different operating modes is calculated in combination with the operating mode of the air conditioner, the power of the compressor, and the mass flow rate of the air conditioner. The inlet and outlet enthalpy values ​​on the outdoor side are detected by the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, the accuracy of the air conditioner capacity calculation is improved while reducing the hardware space occupied and the hardware cost of the air conditioner.

[0136] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0137] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant circulates in a circulation loop through the compressor, condenser, expansion valve and evaporator; The compressor is used to compress the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; An outdoor heat exchanger that exchanges heat between the refrigerant flowing inside and the air; The controller is configured to: obtain an operation mode of the air conditioner, an input voltage of the compressor, an input current of the compressor, an operation frequency of the compressor, a first inlet enthalpy value, a first outlet enthalpy value, a second inlet enthalpy value, and a second outlet enthalpy value of the outdoor heat exchanger; Determining the power of the compressor according to the input voltage of the compressor, the input current of the compressor and a power calculation formula of the compressor; Determining the mass flow rate of the air conditioner according to the operating frequency of the compressor and the mass flow rate calculation formula of the air conditioner; When the air conditioner is in cooling mode, the cooling capacity of the air conditioner is determined according to the power of the compressor, the mass flow rate, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger and the cooling capacity calculation formula of the air conditioner; When the air conditioner is in heating mode, the heating amount of the air conditioner is determined according to the power of the compressor, the mass flow, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

2. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: A first coil temperature sensor, used to detect the temperature of the first coil of the outdoor heat exchanger; When obtaining the first inlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Acquire a first coil temperature, a first saturation pressure corresponding to the first coil temperature, and a first temperature correction value; The first inlet enthalpy value is determined according to the first coil temperature, the first saturation pressure, and the first temperature correction value.

3. The air conditioner according to claim 2, characterized in that: When obtaining the first outlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Acquire the first coil temperature, the first saturation pressure and a second temperature correction value; The first outlet enthalpy value is determined according to the first coil temperature, the first saturation pressure and the second temperature correction value.

4. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: A second coil temperature sensor, used to detect the temperature of the second coil of the outdoor heat exchanger; When obtaining the second inlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Acquire a second coil temperature, a second saturated pressure corresponding to the second coil temperature, and a third temperature correction value; The second inlet enthalpy is determined according to the second coil temperature, the second saturation pressure and the third temperature correction value.

5. The air conditioner according to claim 4, characterized in that: When obtaining the second outlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Obtaining a second coil temperature, a second saturated pressure corresponding to the second coil temperature, and a fourth temperature correction value; The second outlet enthalpy value is determined according to the second coil temperature, the second saturation pressure and the fourth temperature correction value.

6. The air conditioner according to claim 1, characterized in that: The power calculation formula of the compressor includes: W=η*U*I Wherein, W is the power of the compressor, U is the input voltage of the compressor, I is the input current of the compressor, and η is the efficiency coefficient of the compressor.

7. The air conditioner according to claim 1, characterized in that: The mass flow calculation formula of the air conditioner includes: qm=C1*Q y *H*ρ Wherein, qm is the mass flow rate, C1 is the mass flow rate correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor, and Q y is the preset compressor displacement.

8. The air conditioner according to claim 1, characterized in that: The refrigeration capacity calculation formula includes: C c =|hin1-hout1|×C1*Q y *H*ρ-η*U*I Wherein, hin1 is the first inlet enthalpy value, hout1 is the first outlet enthalpy value, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor, and Q y is the preset compressor displacement, U is the input voltage of the compressor, I is the input current of the compressor, and η is the compressor efficiency coefficient. The heating capacity calculation formula includes: C h =|hin2-hout2|×C1*Q y *H*p-h*U*I Wherein, hin2 is the second inlet enthalpy value, hout2 is the second outlet enthalpy value, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor, and Q y is the preset compressor displacement, U is the input voltage of the compressor, I is the input current of the compressor, and η is the compressor efficiency coefficient.

9. The air conditioner according to claim 1, characterized in that: The controller is also configured to: The cooling capacity or heating capacity is sent to a user terminal and / or displayed on a display screen of the air conditioner.

10. A method for calculating the capacity of an air conditioner, characterized in that: include: Acquire the operation mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, the operation frequency of the compressor, the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger; Determining the power of the compressor according to the input voltage of the compressor, the input current of the compressor and a power calculation formula of the compressor; Determining the mass flow rate of the air conditioner according to the operating frequency of the compressor and the mass flow rate calculation formula of the air conditioner; When the air conditioner is in cooling mode, the cooling capacity of the air conditioner is determined according to the power of the compressor, the mass flow rate, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger and the cooling capacity calculation formula of the air conditioner; When the air conditioner is in heating mode, the heating amount of the air conditioner is determined according to the power of the compressor, the mass flow, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

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