Air conditioner and method for calculating its capacity

Abstract

The application provides an air conditioner and a capacity calculation method thereof. The air conditioner comprises a controller configured to: acquire 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, 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; determine a power of the compressor and a mass flow rate of the air conditioner according to the parameters; when the air conditioner is in a refrigeration mode, determine a refrigerating capacity of the air conditioner according to the power of the compressor, the mass flow rate, the first inlet enthalpy value, the first outlet enthalpy value and a refrigerating capacity calculation formula; and when the air conditioner is in a heating mode, determine a heating capacity of the air conditioner according to the power of the compressor, the mass flow rate, the second inlet enthalpy value, the second outlet enthalpy value and a heating capacity calculation formula. The application avoids the problem that the air enthalpy value is greatly affected by the outdoor environment, reduces the hardware occupation space and hardware cost of the air conditioner, and improves the accuracy of the capacity calculation of the air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to an air conditioner and a capacity calculation method thereof. BACKGROUND

[0002] Since an air conditioner must have a capacity calculation function, and air conditioners without the function are not allowed to be sold in some regions and countries, currently, an air conditioner determines the enthalpy in and out of an evaporator by detecting the temperature and pressure at the inlet and outlet of the evaporator, so as to calculate the capacity of the air conditioner based on the enthalpy difference method; or detects the air enthalpy at the inlet and outlet of the air conditioner, and calculates the capacity of the air conditioner by the enthalpy difference method.

[0003] However, the above method needs to additionally increase devices in the air conditioner, occupies the internal space of the air conditioner, and the structure of the devices is complex, which leads to a higher cost of the air conditioner, especially the air enthalpy at the inlet and outlet is greatly affected by the outdoor environment temperature, and the installation position and detection accuracy of the detection device are required to be higher, which further increases the cost of the air conditioner. SUMMARY

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

[0005] To this end, one object of the present application is to provide an air conditioner which detects the inlet and outlet enthalpy on the outdoor side by using the existing devices on the outdoor side, without detecting the air enthalpy at the inlet and outlet on the outdoor side, avoiding the problem that the air enthalpy is greatly affected by the outdoor environment, and without increasing additional detection devices on the indoor side, so as to reduce the hardware space and hardware cost of the air conditioner, and improve the accuracy of the capacity calculation of the air conditioner.

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

[0007] In order to achieve the above object, the embodiment of the first aspect of the present application proposes an air conditioner, comprising: a refrigerant circulation loop, which circulates refrigerant in a circulation loop through a compressor, a condenser, an expansion valve and an evaporator; the compressor 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 exchanges heat between the refrigerant flowing inside and the air; a controller 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; determine 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; determine 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 a cooling mode, determine 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; when the air conditioner is in a heating mode, determine the heating capacity of the air conditioner 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] The air conditioner according to the embodiment of the present application has the device for detecting the inlet and outlet enthalpy values on the outdoor side, detects the inlet and outlet enthalpy values by using the existing device on the outdoor side, for example, 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 combines the operating mode of the air conditioner, the power of the compressor and the mass flow rate of the air conditioner to calculate the real-time capacity of the air conditioner in different operating modes, detects the inlet and outlet enthalpy values on the outdoor side by using the existing device on the outdoor side, does not need to detect the inlet and outlet air enthalpy values on the outdoor side, avoids the problem that the air enthalpy values are greatly affected by the outdoor environment, and does not need to increase the additional detection device on the indoor side, thereby reducing the hardware occupation space and the hardware cost of the air conditioner and improving the accuracy of the capacity calculation of the air conditioner.

[0009] In some embodiments, the air conditioner further comprises: a first coil temperature sensor for detecting the first coil temperature of the outdoor heat exchanger; when the first inlet enthalpy value of the outdoor heat exchanger is obtained, 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; and determine the first inlet enthalpy value according to the first coil temperature, the first saturation pressure and the first temperature correction value.

[0010] In some embodiments, when the first outlet enthalpy value of the outdoor heat exchanger is acquired, the controller is configured to acquire the first coil temperature, the first saturation pressure, and a second temperature correction value; and determine the first outlet enthalpy value according to the first coil temperature, the first saturation pressure, and the second temperature correction value.

[0011] In some embodiments, the air conditioner further comprises a second coil temperature sensor for detecting a second coil temperature of the outdoor heat exchanger; and when the second inlet enthalpy value of the outdoor heat exchanger is acquired, the controller is configured to acquire the second coil temperature, a second saturation pressure corresponding to the second coil temperature, and a third temperature correction value; and 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 the second outlet enthalpy value of the outdoor heat exchanger is acquired, the controller is configured to acquire the second coil temperature, a second saturation pressure corresponding to the second coil temperature, and a fourth temperature correction value; and determine the second outlet enthalpy value according to the second coil temperature, the second saturation pressure, and the fourth temperature correction value.

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

[0014] W = η * U * I

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

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

[0017] qm = C1 * Q y * H * ρ

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

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

[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 a mass flow correction coefficient, p is refrigerant density, H is the operating frequency of the compressor, Q y is a preset compressor displacement, U is the input voltage of the compressor, I is the input current of the compressor, and η is a compressor efficiency coefficient.

[0022] The heating capacity calculation formula comprises:

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

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

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

[0026] To achieve the above-mentioned purpose, embodiments of the second aspect of the present application propose an air conditioner capacity calculation method, the method comprising: obtaining 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 of the outdoor heat exchanger, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value; 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; 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; when the air conditioner is in the refrigeration mode, determining the refrigerating capacity of the air conditioner according to the power of the compressor, the mass flow, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger and the refrigerating capacity calculation formula of the air conditioner; when the air conditioner is in the 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 and the second outlet enthalpy value of the outdoor heat exchanger and the heating capacity calculation formula of the air conditioner.

[0027] The capacity calculation method of the air conditioner according to the embodiment of the present application detects the inlet and outlet enthalpy values by using the existing device on the outdoor side, for example, 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 calculates the real-time capacity of the air conditioner in different operation modes in combination with the operation mode of the air conditioner, the power of the compressor and the mass flow of the air conditioner. The inlet and outlet enthalpy values on the outdoor side are detected by using the existing device on the outdoor side, without detecting the inlet and outlet air enthalpy values on the outdoor side, avoiding the problem that the air enthalpy values are greatly affected by the outdoor environment, and without adding additional detection device on the indoor side, thereby reducing the hardware occupation space and hardware cost of the air conditioner, and improving the accuracy of the capacity calculation of the air conditioner.

[0028] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, from which the singular aspects become apparent.

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

[0031] Figure 2 is a flow chart of a refrigerating capacity calculation method of an air conditioner according to an embodiment of the present application;

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

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

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

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

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

[0037] Reference signs: 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 application are described in detail below with reference to the attached drawings. Embodiments of the present application are described in detail below.

[0040] The air conditioner in the present application 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 air that has been adjusted and heat-exchanged.

[0041] The compressor compresses 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 heat is released to the surrounding environment through the condensation process.

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

[0043] The outdoor unit of the air conditioner refers to a portion of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can 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 is made below Figures 1-6 An air conditioner 1 according to an embodiment of the present application is described.

[0046] As Figure 1 shown, the air conditioner 1 according to an embodiment of the present application includes a refrigerant circulation circuit 11, a compressor 12, an outdoor heat exchanger 13, and a controller 14, wherein,

[0047] The refrigerant circulation loop 11 circulates refrigerant in the compressor 12, the condenser, the expansion valve and the evaporator in the circulation loop; the compressor 12 is used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge to the condenser; the outdoor heat exchanger 13 exchanges heat 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; determine the power of the compressor 12 according to the input voltage of the compressor 12, the input current of the compressor 12 and the power calculation formula of the compressor 12; determine the mass flow rate of the air conditioner 1 according to the operating frequency of the compressor 12 and the mass flow rate calculation formula of the air conditioner 1; when the air conditioner 1 is in the refrigeration mode, determine the refrigeration capacity of the air conditioner 1 according to the power of the compressor 12, the mass flow rate, the first inlet enthalpy value and the first outlet enthalpy value of the outdoor heat exchanger 13 and the refrigeration capacity calculation formula of the air conditioner 1; when the air conditioner 1 is in the heating mode, determine the heating capacity of the air conditioner 1 according to the power of the compressor 12, the mass flow rate, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger 13 and the heating capacity calculation formula of the air conditioner 1.

[0048] In the embodiment, after the air conditioner 1 is started, the controller 14 obtains the operating mode of the air conditioner 1 in real time, and the operating mode includes, for example, the refrigeration operating mode and the heating operating mode; since the input voltage, the input current and the operating frequency of the compressor 12 change when the compressor 12 compresses low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharges to the condenser, the input voltage of the compressor 12 is denoted as U, the input current of the compressor 12 is denoted as I, and the operating frequency of the compressor 12 is denoted as H; since the inlet and outlet enthalpy values change when the outdoor heat exchanger 13 exchanges heat between the refrigerant flowing inside and the air, the first inlet enthalpy value of the outdoor heat exchanger 13 is denoted as hin1, the first outlet enthalpy value is denoted as hout1, the second inlet enthalpy value is denoted as hin2, and the second outlet enthalpy value is denoted as hout2.

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

[0050] After the mass flow rate qm of the air conditioner 1 is determined, the capacity calculation formula of the air conditioner 1 is used to determine the capacity of the air conditioner 1 in different operation modes in combination with the above parameters. For example, when the operation mode of the air conditioner 1 is in the refrigeration operation mode, the outdoor heat exchanger 13 is used as a condenser, and then the power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the first inlet enthalpy hin1 and the first outlet enthalpy hout1 of the outdoor heat exchanger 13 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, denoted 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 then the power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the second inlet enthalpy hin2 and the second outlet enthalpy hout2 of the outdoor heat exchanger 13 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, denoted as C h to determine the real-time capacity of the air conditioner 1 in different operation modes.

[0051] The refrigeration capacity calculation method of the air conditioner according to the embodiment of the present application is described below with reference to Figure 2

[0052] Step S11, the air conditioner is started to operate.

[0053] Step S121, 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 and the first outlet enthalpy of the outdoor heat exchanger, the second inlet enthalpy and the second outlet enthalpy of the outdoor heat exchanger are obtained.

[0054] Step S23, it is judged whether the air conditioner is in the refrigeration operation mode, if yes, step S25 is executed; otherwise, step S121 is executed.

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

[0056] The heating capacity calculation method of the air conditioner according to the embodiment of the present application is described below with reference to Figure 3

[0057] Step S11, the air conditioner is started to operate.

[0058] Step S121, 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 and the first outlet enthalpy of the outdoor heat exchanger, the second inlet enthalpy and the second outlet enthalpy of the outdoor heat exchanger are obtained.

[0059] Step S23, it is judged whether the air conditioner is in the refrigeration operation mode, if yes, step S121 is executed; otherwise, step S24 is executed.​​

[0060] Step S24: Determine the heating capacity of the air conditioner based on the compressor's power, mass flow rate, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger, and the formula for calculating the heating capacity of the air conditioner.

[0061] According to an embodiment of the present invention, the air conditioner 1 has a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side. After the air conditioner 1 is turned on, the inlet and outlet enthalpy values ​​are detected using the existing device on the outdoor side, 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. Combined 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 real-time capacity of the air conditioner 1 under different operating modes is calculated. By using the existing outdoor device to detect the inlet and outlet enthalpy values ​​on the outdoor side, it is not necessary to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thus avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment. It is also not necessary to add an additional detection device on the indoor side. Therefore, while reducing the hardware space occupied and 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 further includes: a first coil temperature sensor 15 for detecting the first coil temperature of the outdoor heat exchanger 13; when the first inlet enthalpy value of the outdoor heat exchanger 13 is obtained, 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; and determine the first inlet enthalpy value based on the first coil temperature, the first saturation pressure, and the first temperature correction value.

[0063] In an embodiment, such as Figure 4 The diagram shown is a structural schematic of an air conditioner according to a specific embodiment of the present invention. The air conditioner 1 further includes 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 acquires the first coil temperature in real time from the first coil temperature sensor 15, for example, denoted as TI; acquires the first temperature correction value preset in the controller 14 based on engineering testing experience, for example, denoted as Tx1; and acquires the first saturation pressure corresponding to the first coil temperature TI, for example, denoted as PI. The controller 14 then corrects the first coil temperature TI based on the first temperature correction value Tx1, that is, the corrected first coil temperature is TI+Tx1. Based on the fitting relationship between the corrected first coil temperature TI+Tx1 and the first saturation pressure PI, the corresponding first inlet enthalpy value hin1 is determined.

[0065] For example Figure 5Fig. 1 is a schematic diagram of the refrigerant cycle pressure-enthalpy of an air conditioner according to an embodiment of the present application. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship of pressure and temperature. The first inlet enthalpy value hin1 is determined by bringing the first coil temperature TI and the first saturated pressure PI into the curve of Figure 5 The midpoint 2 of the curve is the intersection point of the first coil temperature TI and the first saturated pressure PI, i.e. P2=PI, T2=TI+Tx1. The enthalpy value corresponding to the point is determined as the first outlet enthalpy value hout1.

[0066] In some embodiments, when the first outlet enthalpy value of the outdoor heat exchanger 13 is obtained, the controller 14 is configured to: obtain the first coil temperature, the first saturated pressure and the second temperature correction value; and determine the first outlet enthalpy value according to the first coil temperature, the first saturated 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, denoted as TI, obtains the second temperature correction value, for example, denoted as Tx2, which is pre-set in the controller 14 according to engineering test experience, and obtains the first saturated pressure corresponding to the first coil temperature TI, for example, denoted as PI, so as to correct the first coil temperature TI according to the second temperature correction value Tx2, i.e. the corrected first coil temperature is TI+Tx2, and thus the corresponding first outlet enthalpy value hout1 is determined according to the fitting relationship of the corrected first coil temperature TI+Tx2 and the first saturated pressure PI.

[0068] For example Figure 5 Fig. 1 is a schematic diagram of the refrigerant cycle pressure-enthalpy of an air conditioner according to an embodiment of the present application. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship of pressure and temperature. The first inlet enthalpy value hin1 is determined by bringing the first coil temperature TI and the first saturated pressure PI into the curve of Figure 5 The midpoint 2 of the curve is the intersection point of the first coil temperature TI and the first saturated pressure PI, i.e. P2=PI, T2=TI+Tx2. The enthalpy value corresponding to the point is determined as the first outlet enthalpy value hout1.

[0069] In some embodiments, the air conditioner 1 further comprises: a second coil temperature sensor 16 for detecting the second coil temperature of the outdoor heat exchanger 13; and when the second inlet enthalpy value of the outdoor heat exchanger 13 is obtained, 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; and 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 an air conditioner according to an embodiment of the present application. The air conditioner 1 comprises an outdoor heat exchanger 13, a second temperature sensor 16, a controller 14, and a second pressure sensor 17.

[0071] The controller 14 obtains the second coil temperature Tl from the second temperature sensor 16 in real time, obtains a third temperature correction value Tx3 preset in the controller 14 according to engineering test experience, and obtains a second saturation pressure P1 corresponding to the second coil temperature Tl, corrects the second coil temperature Tl according to the third temperature correction value Tx3, i.e., Tl+Tx3, and determines a corresponding second inlet enthalpy hin2 according to a fitting relationship between the corrected second coil temperature Tl+Tx3 and the second saturation pressure P1.

[0072] For example Figure 5 Fig. 1 is a schematic diagram of an air conditioner according to an embodiment of the present application. The air conditioner 1 comprises an outdoor heat exchanger 13, a second temperature sensor 16, a controller 14, and a second pressure sensor 17. Figure 5 The curve in Fig. 1 is a corresponding enthalpy value determined according to a fitting relationship between pressure and temperature. The second coil temperature Tl+Tx3 and the second saturation pressure P1 are brought into the curve in Fig. 1, and the midpoint 5 of the curve is the intersection point of the second coil temperature Tl+Tx3 and the second saturation pressure P1, i.e., P5=P1, T5=Tl+Tx3. The enthalpy value corresponding to the midpoint 5 is determined as the second inlet enthalpy hin2.

[0073] In some embodiments, when obtaining the second outlet enthalpy hout2 of the outdoor heat exchanger 13, the controller 14 is configured to obtain a second coil temperature, a second saturation pressure corresponding to the second coil temperature, and a fourth temperature correction value, determine the second outlet enthalpy hout2 according to the second coil temperature, the second saturation pressure, and the fourth temperature correction value.

[0074] In some embodiments, when obtaining the second outlet enthalpy hout2 of the outdoor heat exchanger 13, the controller 14 is configured to obtain a second coil temperature, a second saturation pressure corresponding to the second coil temperature, and a fourth temperature correction value, determine the second outlet enthalpy hout2 according to the second coil temperature, the second saturation pressure, and the fourth temperature correction value.

[0075] For example Figure 5 Fig. 1 is a schematic diagram of an air conditioner according to an embodiment of the present application. The air conditioner 1 comprises an outdoor heat exchanger 13, a second temperature sensor 16, a controller 14, and a second pressure sensor 17. Figure 5The curve is a curve of the second coil temperature TI and the second saturated pressure PI, and the midpoint 1 of the curve is an intersection point of the corrected second coil temperature TI+Tx4 and the second saturated pressure PI, i.e. P1=PI, T1=TI+Tx4, and the enthalpy value corresponding to the point is determined as 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 an embodiment, after the input voltage U of the compressor 12 and the input current I of the compressor 12 are obtained, the compressor efficiency coefficient η preset in the controller 14 is obtained, for example, denoted as η, and the above parameters are brought into the power calculation formula of the compressor 12, and the power calculation formula of the compressor 12 is as follows:

[0080] W=η*U*I

[0081] wherein 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 the 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, C1 is the mass flow correction coefficient, ρ is the refrigerant density, H is the operating frequency of the compressor 12, and Q y is the preset compressor displacement.

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

[0087] qm=C1*Q y *H*ρ

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

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

[0090] In some embodiments, the refrigerating capacity calculation formula comprises:

[0091] C c = |hin1-hout1| x C1*Q y *H*p-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, p 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 embodiments, after the power W of the compressor 12, the mass flow qm of the air conditioner 1, the first inlet enthalpy value hin1 and the first outlet enthalpy value hout1 of the outdoor heat exchanger 13 are obtained, the above parameters are brought into the refrigerating capacity calculation formula to obtain the refrigerating capacity C c of the air conditioner 1, and the refrigerating capacity calculation formula is as follows:

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

[0095] By calculating the refrigerating capacity C c of the air conditioner 1, the real-time capacity of the air conditioner 1 in the refrigerating mode is determined.

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

[0097] C h = |hin2-hout2| x C1*Q y *H*p+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, p 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 an embodiment, after 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 obtained, the above parameters are brought 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| x qm + W = |hin2-hout2| x C1*Q y *H*ρ+η*U*I

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

[0102] By calculating the cooling capacity C c and the heating capacity C h of the air conditioner 1, the real-time capacity of the air conditioner 1 in different operating modes is determined.

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

[0104] In an embodiment, after the cooling capacity C c or the heating capacity C h of the air conditioner 1 is obtained, the controller 14 sends the cooling capacity C c or the heating capacity C h to a user terminal such as a mobile phone APP and / or to the display screen of the air conditioner 1 for display, so as to facilitate the user to understand the real-time state of the air conditioner 1.

[0105] The capacity calculation method of the air conditioner of the embodiment of the present application will be illustrated below with reference to Figure 6 .

[0106] As shown in Figure 6 , the capacity calculation method of the air conditioner of the embodiment of the present application at least includes steps S11-S26.

[0107] Step S11, the air conditioner is started to operate.

[0108] Step S12, the operating mode of the air conditioner, the input voltage of the compressor, the input current of the compressor, and the operating frequency of the compressor are obtained.

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

[0110] Step S14, determining the 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 the 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 the 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 the 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 rate of the air conditioner according to the operating frequency of the compressor and the mass flow rate calculation formula of the air conditioner.

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

[0120] Step S24, determining the heating capacity of the air conditioner 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.

[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 the heating capacity to a user terminal and / or displaying the cooling capacity or the heating capacity on a display screen of the air conditioner.

[0123] The air conditioner 1 according to the embodiment of the present application has the device for detecting the inlet and outlet enthalpy on the outdoor side, and after the air conditioner 1 is started, the inlet and outlet enthalpy of the outdoor side is detected by the device, for example, the first inlet enthalpy, the first outlet enthalpy, the second inlet enthalpy and the second outlet enthalpy of the outdoor heat exchanger 13, and the real-time capacity of the air conditioner 1 in different operation modes is calculated in combination with the operation mode of the air conditioner 1, the power of the compressor 12 and the mass flow of the air conditioner 1. The inlet and outlet enthalpy of the outdoor side is detected by the device, without detecting the inlet and outlet air enthalpy of the outdoor side, so that the problem that the air enthalpy is greatly affected by the outdoor environment is avoided, and no additional detection device is needed on the indoor side, so that the hardware space and the hardware cost of the air conditioner 1 are reduced, and the accuracy of the capacity calculation of the air conditioner 1 is improved.

[0124] The air conditioner according to the embodiment of the present application will be described below. Figure 7 The capacity calculation method of the air conditioner according to the embodiment of the present application is described.

[0125] As shown in Figure 7 The capacity calculation method of the air conditioner according to the embodiment of the present application at least includes steps S1-S4.

[0126] In step S1, 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 of the outdoor heat exchanger, the first outlet enthalpy, the second inlet enthalpy and the second outlet enthalpy are obtained.

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

[0128] In the embodiment, after the air conditioner is started, the controller obtains the operation mode of the air conditioner in real time, which includes, for example, the cooling operation mode and the heating operation mode. Since the input voltage, the input current and the operation frequency of the compressor change when the compressor compresses the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharges it to the condenser, the input voltage of the compressor is recorded as U, the input current of the compressor is recorded as I, and the operation frequency of the compressor is recorded as H. Since the inlet and outlet enthalpy changes when the indoor heat exchanger exchanges heat between the flowing refrigerant and the air, the first inlet enthalpy of the outdoor heat exchanger is recorded as hin1, the first outlet enthalpy is recorded as hout1, the second inlet enthalpy is recorded as hin2, and the second outlet enthalpy is recorded as hout2.

[0129] In step S2, 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.

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

[0131] In step S3, the mass flow rate of the air conditioner is determined according to the operating frequency of the compressor and the mass flow rate calculation formula of the air conditioner.

[0132] In the embodiment, after the above parameters are acquired, the operating frequency H of the compressor is brought into the mass flow rate calculation formula of the air conditioner to determine the mass flow rate of the air conditioner, for example, denoted as qm.

[0133] In step S4, when the air conditioner is in the 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 the 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.

[0134] In the embodiment, after the mass flow rate qm of the air conditioner is determined, the capacity calculation formula of the air conditioner is used to determine the capacity of the air conditioner in different operating modes in combination with the above parameters; for example, when the operating mode of the air conditioner is in the cooling operating mode, the outdoor heat exchanger is used as the condenser, and then 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 and the first outlet enthalpy value hout1 of the outdoor heat exchanger, and the cooling capacity calculation formula of the air conditioner; when the operating mode of the air conditioner is in the heating operating mode, the outdoor heat exchanger is used as the evaporator, and then 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 and the second outlet enthalpy value hout2 of the outdoor heat exchanger, and the heating capacity calculation formula of the air conditioner, so as to determine the real-time capacity of the air conditioner in different operating modes.

[0135] According to the capacity calculation method of the air conditioner provided in the embodiment of the present application, since the outdoor side has a device for detecting the inlet and outlet enthalpy values, the inlet and outlet enthalpy values, for example, 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, are detected by using the existing device on the outdoor side after the air conditioner is started to operate, and the real-time capacity of the air conditioner in 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 using the existing device on the outdoor side, without the need of detecting the inlet and outlet air enthalpy values on the outdoor side, thereby avoiding the problem that the air enthalpy values are greatly affected by the outdoor environment, and without the need of adding an extra detection device on the indoor side, so that the hardware occupation space and the hardware cost of the air conditioner are reduced, and the accuracy of the capacity calculation of the air conditioner is improved.

[0136] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example.

[0137] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises: a refrigerant circulation loop, in which refrigerant circulates through a compressor, a condenser, an expansion valve, and an evaporator; a compressor configured to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge the refrigerant gas to the condenser; an outdoor heat exchanger configured to exchange heat between refrigerant flowing therein and air; a first coil temperature sensor configured to detect a first coil temperature of the outdoor heat exchanger; a controller configured to: obtain 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 of the outdoor heat exchanger, and a first outlet enthalpy value of the outdoor heat exchanger; determine a 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; determine a mass flow rate of the air conditioner according to the operating frequency of the compressor and a mass flow rate calculation formula of the air conditioner; when the air conditioner is in a cooling mode, determine a cooling capacity of the air conditioner according to the power of the compressor, the mass flow rate, the first inlet enthalpy value of the outdoor heat exchanger, the first outlet enthalpy value of the outdoor heat exchanger, and a cooling capacity calculation formula of the air conditioner; when the first inlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to: obtain the first coil temperature, a first saturation pressure corresponding to the first coil temperature, and a 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; when the first outlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to: obtain the first coil temperature, the first saturation pressure, and a 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.

2. The air conditioner according to claim 1, wherein The air conditioner further comprises: a second coil temperature sensor configured to detect a second coil temperature of the outdoor heat exchanger; the controller is further configured to obtain a second inlet enthalpy value of the outdoor heat exchanger and a second outlet enthalpy value of the outdoor heat exchanger, including: obtaining the second coil temperature, a second saturation pressure corresponding to the second coil temperature, and a third temperature correction value; determining the second inlet enthalpy value according to the second coil temperature, the second saturation pressure, and the third temperature correction value; when the air conditioner is in a heating mode, determining a heating capacity of the air conditioner according to the power of the compressor, the mass flow rate, the second inlet enthalpy value of the outdoor heat exchanger, the second outlet enthalpy value of the outdoor heat exchanger, and a heating capacity calculation formula of the air conditioner.

3. The air conditioner of claim 2, wherein when the second outlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to: obtain the second coil temperature, a second saturation pressure corresponding to the second coil temperature, and a fourth temperature correction value; determine the second outlet enthalpy value according to the second coil temperature, the second saturation pressure, and the fourth temperature correction value.

4. The air conditioner of claim 1, wherein The power calculation formula of the compressor comprises: wherein the is the power of the compressor, the is the input voltage of the compressor, the is the input current of the compressor, the is the compressor efficiency coefficient.

5. The air conditioner of claim 1, wherein The mass flow rate calculation formula of the air conditioner comprises: Wherein, the is the mass flow, the is the mass flow correction factor, the is the refrigerant density, the is the operating frequency of the compressor, the is the preset compressor displacement.

6. The air conditioner of claim 1, wherein The cooling capacity calculation formula comprises: wherein, is the first inlet enthalpy value, is the first outlet enthalpy value, the is a mass flow correction factor, the is a refrigerant density, the is an operating frequency of the compressor, the is a preset compressor displacement, the is an input voltage of the compressor, the is an input current of the compressor, the is a compressor efficiency factor. The heating capacity calculation formula comprises: wherein, is the second inlet enthalpy value, is the second outlet enthalpy value, the is a mass flow correction factor, the is a refrigerant density, the is an operating frequency of the compressor, the is a preset compressor displacement, the is an input voltage of the compressor, the is an input current of the compressor, the is a compressor efficiency factor.

7. The air conditioner of claim 1, wherein The controller is further configured to: send the refrigerating or heating capacity to a user terminal and / or display on a display screen of the air conditioner.

8. A method of calculating a capacity of an air conditioner, characterized by, comprise: obtain an operating mode of the air conditioner, an input voltage of a 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; determine a power of the compressor according to the input voltage of the compressor, the input current of the compressor and a compressor power calculation formula; determine a mass flow of the air conditioner according to the operating frequency of the compressor and an air conditioner mass flow calculation formula; when the air conditioner is in a refrigeration mode, determine a refrigerating 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 an air conditioner refrigeration capacity calculation formula; a first coil temperature sensor for detecting a 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, a first saturation pressure corresponding to the first coil temperature and a 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; wherein, when obtaining the first outlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the first coil temperature, the first saturation pressure and a 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.

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