Air conditioner

Abstract

The application provides an air conditioner, which comprises a controller configured to: acquire an operation mode of the air conditioner, a mass flow of the air conditioner, 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 an operation power of a compressor according to the parameters; when the air conditioner is in a refrigeration operation mode, determine a refrigeration capacity of the air conditioner according to the operation power, the mass flow, the first inlet enthalpy value, the first outlet enthalpy value and a refrigeration capacity calculation formula of the air conditioner; when the air conditioner is in a heating operation mode, determine a heating capacity of the air conditioner according to the operation power, the mass flow, the second inlet enthalpy value, the second outlet enthalpy value and a heating capacity calculation formula of the air conditioner, so that the problem that the air enthalpy value is greatly affected by the outdoor environment is avoided, the hardware occupation space and the hardware cost of the air conditioner are reduced, and the accuracy of the air conditioner capacity calculation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and particularly to an air conditioner. BACKGROUND

[0002] Since the air conditioner must have the capacity calculation function, and the air conditioner without the function is not allowed to be sold in some regions and countries, at present, the air conditioner determines the inlet enthalpy and outlet enthalpy of the 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 the air conditioner detects the inlet and outlet air enthalpy 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 the device in the air conditioner, occupies the internal space of the air conditioner, and the device structure is complex, which leads to the higher cost of the air conditioner, especially the inlet and outlet air enthalpy is greatly affected by the outdoor environment temperature, and the installation position and detection precision of the detection device are required to be higher, which further increases the cost of the air conditioner. SUMMARY

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

[0005] To this end, one purpose of the present application is to provide an air conditioner, which detects the inlet and outlet enthalpy of the outdoor side by using the existing device of the outdoor side, without detecting the inlet and outlet air enthalpy of the outdoor side, avoids the problem that the air enthalpy is greatly affected by the outdoor environment, and does not need to additionally increase the detection device in the indoor side, so as to reduce the hardware occupation space and hardware cost of the air conditioner, and improve the accuracy of the capacity calculation of the air conditioner.

[0006] 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 compressor, a condenser and an evaporator in the circulation loop; 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 mass flow rate of the air conditioner, 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 operating power of the compressor according to the mass flow rate of the air conditioner, the second outlet enthalpy value, the first inlet enthalpy value and the operating power calculation formula of the compressor; when the air conditioner is in a cooling operation mode, determine the cooling capacity of the air conditioner according to the operating power, the mass flow rate, the first inlet enthalpy value, the first outlet enthalpy value and the cooling capacity calculation formula of the air conditioner; when the air conditioner is in a heating operation mode, determine the heating capacity of the air conditioner according to the operating power, the mass flow rate, the second inlet enthalpy value, the second outlet enthalpy value and the heating capacity calculation formula of the air conditioner.

[0007] 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 operating 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. 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 increasing 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.

[0008] In some embodiments, the cooling capacity calculation formula comprises:

[0009] C c = |hin1-hout1| x qm-W

[0010] wherein hin1 is the first inlet enthalpy value, hout1 is the first outlet enthalpy value, qm is the mass flow rate, and W is the operating power of the compressor;

[0011] The heating capacity calculation formula comprises:

[0012] C h = |hin2-hout2| x qm+W

[0013] Wherein, hin2 is the second inlet enthalpy value, hout2 is the second outlet enthalpy value, qm is the mass flow rate, and W is the operating power of the compressor.

[0014] In some embodiments, the air conditioner further comprises an exhaust pressure sensor configured to detect an exhaust pressure of the compressor exhaust port, and an exhaust temperature sensor configured to detect an exhaust temperature of the compressor exhaust port. When the first inlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to obtain a first exhaust pressure, a first exhaust temperature, and a first temperature correction value, and determine the first inlet enthalpy value according to the first exhaust pressure, the first exhaust temperature, and the first temperature correction value.

[0015] In some embodiments, the air conditioner further comprises a first coil temperature sensor configured to detect a coil temperature of the condenser. When the first outlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to obtain a second exhaust pressure, the coil temperature of the condenser, and a second temperature correction value, and determine the first outlet enthalpy value according to the second exhaust pressure, the coil temperature of the condenser, and the second temperature correction value.

[0016] In some embodiments, the air conditioner further comprises a suction pressure sensor configured to detect a suction pressure of the compressor suction port, and a second coil temperature sensor configured to detect a coil temperature of the outdoor heat exchanger. When the second inlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to obtain a first suction pressure, the coil temperature of the outdoor heat exchanger, and a third temperature correction value, and determine the second inlet enthalpy value according to the first suction pressure, the coil temperature of the outdoor heat exchanger, and the third temperature correction value.

[0017] In some embodiments, the air conditioner further comprises a suction temperature sensor configured to detect a suction temperature of the compressor suction port. When the second outlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to obtain a second suction pressure, a first suction temperature, and a fourth temperature correction value, and determine the second outlet enthalpy value according to the second suction pressure, the first suction temperature, and the fourth temperature correction value.

[0018] In some embodiments, the air conditioner further comprises a third coil temperature sensor configured to detect a coil temperature of the evaporator. When the mass flow rate of the air conditioner is obtained, the controller is configured to obtain the coil temperature of the evaporator, the coil temperature of the condenser, and a preset temperature coupling coefficient, and determine the mass flow rate according to the coil temperature of the evaporator, the coil temperature of the condenser, the preset temperature coupling coefficient, and a mass flow rate calculation formula.

[0019] In some embodiments, the mass flow rate calculation formula comprises:

[0020] qm=C1+C2*T z +C3*T1+C4*T z 2 +C5*T z *T1+C6*T1 2 +C7*T z 3 +C8*T z 2 *T1*C9*T z *T1 2 +C 10 *T1 3

[0021] Wherein, the T1 is the coil temperature of the condenser, the T z is the coil temperature of the evaporator, the C1 to C 10 are the preset temperature coupling coefficients.

[0022] In some embodiments, the running power calculation formula of the compressor comprises:

[0023] W=qm*(hout2-hin1)

[0024] Wherein, W is the running power, qm is the mass flow, hin1 is the second outlet enthalpy value, and hout2 is the first inlet enthalpy value.

[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] Additional aspects and advantages of the application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0028] Figure 1 is a structural schematic diagram of an air conditioner according to an embodiment of the application;

[0029] Figure 2 is a flow chart of a refrigerating capacity calculation method of an air conditioner according to an embodiment of the application;

[0030] Figure 3 is a flow chart of a heating capacity calculation method of an air conditioner according to an embodiment of the application;

[0031] Figure 4is a configuration diagram of an air conditioner according to one embodiment of the present application;

[0032] Figure 5 is a diagram of refrigerant cycle pressure enthalpy of an air conditioner according to one embodiment of the present application;

[0033] Figure 6 is a flowchart of a capacity calculation method of an air conditioner according to one embodiment of the present application.

[0034] Reference numerals: air conditioner 1;

[0035] Refrigerant cycle circuit 11; compressor 12; outdoor heat exchanger 13; controller 14; discharge pressure sensor 15; discharge temperature sensor 16; first coil temperature sensor 17; suction pressure sensor 18; second coil temperature sensor 19; suction temperature sensor 20; third coil temperature sensor 21. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the accompanying drawings. Embodiments of the present application are described in detail below.

[0037] An 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The application will be described below with reference to Figures 1-6 An air conditioner 1 according to an embodiment of the application is described.

[0043] As Figure 1 shown in the drawings, the air conditioner 1 according to an embodiment of the application comprises a refrigerant circulation loop 11, a compressor 12, an outdoor heat exchanger 13, and a controller 14, wherein,

[0044] The refrigerant circulation loop 11 circulates refrigerant in the compressor 12, a condenser, and an evaporator in a circulation loop; the compressor 12 is configured to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the outdoor heat exchanger 13 exchanges heat between the refrigerant flowing inside and air; the controller 14 is configured to: obtain the operating mode of the air conditioner 1, the mass flow rate of the air conditioner 1, 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 operating power of the compressor according to the mass flow rate of the air conditioner 1, the second outlet enthalpy value of the outdoor heat exchanger 13, the first inlet enthalpy value, and a compressor operating power calculation formula; when the air conditioner 1 is in a cooling operation mode, determine the cooling capacity of the air conditioner 1 according to the operating power, the mass flow rate, the first inlet enthalpy value, the first outlet enthalpy value, and an air conditioner 1 cooling capacity calculation formula; and when the air conditioner 1 is in a heating operation mode, determine the heating capacity of the air conditioner 1 according to the operating power, the mass flow rate, the second inlet enthalpy value, the second outlet enthalpy value, and an air conditioner 1 heating capacity calculation formula.

[0045] 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, which may include, for example, a cooling operation mode and a heating operation mode; obtains the mass flow rate of the air conditioner 1, which may be denoted as qm; obtains the first inlet enthalpy value of the outdoor heat exchanger 13, which may be denoted as hin1, the first outlet enthalpy value of the outdoor heat exchanger 13, which may be denoted as hout1, the second inlet enthalpy value of the outdoor heat exchanger 13, which may be denoted as hin2, and the second outlet enthalpy value of the outdoor heat exchanger 13, which may be denoted as hout2, because the inlet and outlet enthalpy values change when the outdoor heat exchanger 13 exchanges heat between the refrigerant flowing inside and air.

[0046] After the above parameters are obtained, the mass flow rate qm of the air conditioner 1, the second outlet enthalpy value hout2 of the outdoor heat exchanger 13, and the first inlet enthalpy value hin1 are brought into a compressor operating power calculation formula to determine the operating power of the compressor 12, which may be denoted as W.

[0047] After the running frequency W of the compressor 12 is determined, the capacity calculation formula of the air conditioner 1 is used to determine the capacity of the air conditioner 1 in different running modes in combination with the above parameters. For example, when the running mode of the air conditioner 1 is in the refrigeration running mode, the outdoor heat exchanger 13 is used as the condenser, and then the refrigerating capacity of the air conditioner 1, for example, denoted as C is determined according to the running 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, and the refrigerating capacity calculation formula of the air conditioner 1. c When the running mode of the air conditioner 1 is in the heating running mode, the outdoor heat exchanger 13 is used as the evaporator, and then the heating capacity of the air conditioner 1, for example, denoted as C is determined according to the running 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, and the heating capacity calculation formula of the air conditioner 1. h So as to determine the real-time capacity of the air conditioner 1 in different running modes.

[0048] The refrigerating capacity calculation method of the air conditioner according to the embodiment of the present application is described below. Figure 2

[0049] Step S11, the air conditioner is started to run.

[0050] Step S121, the running mode of the air conditioner, the running power of the compressor, the mass flow rate of the air conditioner, the first inlet enthalpy and the first outlet enthalpy of the outdoor heat exchanger, and the second inlet enthalpy and the second outlet enthalpy of the outdoor heat exchanger are obtained.

[0051] Step S25, it is judged whether the air conditioner is in the refrigeration running mode, if yes, step S27 is executed; otherwise, step S121 is executed.

[0052] Step S27, the refrigerating capacity of the air conditioner is determined according to the running power, the mass flow rate, the first inlet enthalpy, the first outlet enthalpy, and the refrigerating capacity calculation formula of the air conditioner.

[0053] The heating capacity calculation method of the air conditioner according to the embodiment of the present application is described below. Figure 3

[0054] Step S11, the air conditioner is started to run.

[0055] Step S121, the running mode of the air conditioner, the running power of the compressor, the mass flow rate of the air conditioner, the first inlet enthalpy and the first outlet enthalpy of the outdoor heat exchanger, and the second inlet enthalpy and the second outlet enthalpy of the outdoor heat exchanger are obtained.

[0056] Step S25, it is judged whether the air conditioner is in the refrigeration running mode, if yes, step S121 is executed; otherwise, step S26 is executed.

[0057] ​​Step S26, according to the operation power, mass flow, second inlet enthalpy value, second outlet enthalpy value and the heating capacity calculation formula of the air conditioner, the heating capacity of the air conditioner is determined.

[0058] According to the air conditioner 1 of the embodiment of the application, since the outdoor side has the device for detecting the inlet and outlet enthalpy values, after starting operation, the inlet and outlet enthalpy values of 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 13, are detected by using the existing device of the outdoor side, 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 operation power of the compressor 12 and the mass flow of the air conditioner 1. The inlet and outlet enthalpy values of the outdoor side are detected by using the existing device of the outdoor side, without the need of detecting the inlet and outlet air enthalpy values of the outdoor side, avoiding the problem that the air enthalpy values are greatly affected by the outdoor environment, and without the need of increasing additional detection devices in the indoor side, thereby reducing the hardware occupation space and hardware cost of the air conditioner 1, and improving the accuracy of the capacity calculation of the air conditioner 1.

[0059] In some embodiments, the cooling capacity calculation formula comprises:

[0060] C c = |hin1-hout1| x qm-W

[0061] Wherein, hin1 is the first inlet enthalpy value, hout1 is the first outlet enthalpy value, qm is the mass flow, and W is the operation power of the compressor 12.

[0062] In the embodiment, after the first inlet enthalpy value hin1, the first outlet enthalpy value hout1, the mass flow qm of the air conditioner 1 and the operation power W of the compressor 12 of the outdoor heat exchanger 13 are obtained, the above parameters are brought into the cooling capacity calculation formula of the air conditioner 1 to obtain the cooling capacity of the air conditioner 1, for example, denoted as C c , and the cooling capacity calculation formula is as follows:

[0063] C c = |hin1-hout1| x qm-W

[0064] By calculating the cooling capacity C c of the air conditioner 1, the real-time capacity of the air conditioner 1 in the cooling mode is determined.

[0065] In some embodiments, the heating capacity calculation formula comprises:

[0066] C h = |hin2-hout2| x qm+W

[0067] Wherein, hin2 is the second inlet enthalpy value, hout2 is the second outlet enthalpy value, qm is the mass flow, and W is the operation power of the compressor 12.

[0068] In the embodiments, after the second inlet enthalpy value hin2, the second outlet enthalpy value hout2, the mass flow rate qm of the air conditioner 1 and the operating power W of the compressor 12 of the outdoor heat exchanger 13 are obtained, the above parameters are brought into the heating capacity calculation formula of the air conditioner 1 to obtain the heating capacity of the air conditioner 1, for example, denoted as C h , and the heating capacity calculation formula is as follows:

[0069] C h = |hin2-hout2| x qm + W

[0070] The real-time capacity of the air conditioner 1 in the heating mode is determined by calculating the heating capacity C h of the air conditioner 1.

[0071] The real-time capacity of the air conditioner 1 in different operating modes is determined by calculating the cooling capacity C c and the heating capacity C h of the air conditioner 1, and the real-time capacity is calculated by using the refrigerant enthalpy difference method, the interference of the environment temperature is reduced, the accuracy of the capacity calculation of the air conditioner 1 is improved, and the capacity calculation of the air conditioner 1 is more convenient and accurate.

[0072] In some embodiments, the air conditioner 1 further comprises: an exhaust pressure sensor 15 configured to detect the exhaust pressure of the exhaust port of the compressor 12; and an exhaust temperature sensor 16 configured to detect the exhaust temperature of the exhaust port of the compressor 12; when the first inlet enthalpy value of the outdoor heat exchanger 13 is obtained, the controller 14 is configured to: obtain the first exhaust pressure, the first exhaust temperature and the first temperature correction value; and determine the first inlet enthalpy value according to the first exhaust pressure, the first exhaust temperature and the first temperature correction value.

[0073] In the embodiments, as shown in Figure 4 , it is a structure schematic diagram of the air conditioner of one specific embodiment of the present application. The air conditioner 1 further comprises: an exhaust pressure sensor 15 and an exhaust temperature sensor 16, wherein the exhaust pressure sensor 15 is configured to detect the exhaust pressure of the exhaust port of the compressor 12; and the exhaust temperature sensor 16 is configured to detect the exhaust temperature of the exhaust port of the compressor 12.

[0074] The controller 14 obtains the first exhaust pressure, for example, denoted as Pp, in real time according to the exhaust pressure sensor 15; the controller 14 obtains the first exhaust temperature, for example, denoted as Tp, in real time according to the exhaust temperature sensor 16, and obtains the first temperature correction value, for example, denoted as Tx1, which is preset in the controller 14 according to the engineering test experience, so as to correct the first exhaust temperature Tp according to the first temperature correction value Tx1, that is, the corrected first exhaust temperature is Tp-Tx1, and the corresponding first inlet enthalpy value hin1 is determined according to the fitting relationship of the corrected first exhaust temperature Tp-Tx1 and the first exhaust pressure Pp.

[0075] For example Figure 5 The diagram shown illustrates the refrigerant circulation enthalpy of an air conditioner according to an embodiment of the present invention. The curves in the diagram represent the corresponding enthalpy values ​​determined based on the fitting relationship between pressure and temperature. The corrected first exhaust temperature Tp-Tx1 and the first exhaust pressure Pp are then substituted into the equation. Figure 5 The curve is such that point 2 is the intersection of the corrected first exhaust temperature Tp-Tx1 and the first exhaust pressure Pp, i.e., P2 = Pp, T2 = Tp-Tx1. The enthalpy value corresponding to this point is determined to be the first inlet enthalpy value hin1.

[0076] In some embodiments, the air conditioner 1 further includes: a first coil temperature sensor 17 for detecting the coil temperature of the condenser; when the first outlet enthalpy value of the outdoor heat exchanger 13 is obtained, the controller 14 is configured to: obtain a second exhaust pressure, the coil temperature of the condenser and a second temperature correction value; and determine the first outlet enthalpy value based on the second exhaust pressure, the coil temperature of the condenser and the second temperature correction value.

[0077] 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 17, wherein the first coil temperature sensor 17 is used to detect the coil temperature of the condenser.

[0078] The controller 14 acquires the second exhaust pressure in real time from the exhaust pressure sensor 15, for example, denoted as Pp; the controller 14 acquires the coil temperature of the condenser in real time from the first coil temperature sensor 17, for example, denoted as T1, and acquires the second temperature correction value preset in the controller 14 based on engineering testing experience, for example, denoted as Tx2, so as to correct the coil temperature of the condenser T1 according to the second temperature correction value Tx2, that is, the corrected coil temperature of the condenser is T1+Tx2. Thus, based on the fitting relationship between the corrected coil temperature of the condenser T1+Tx2 and the second exhaust pressure Pp, the corresponding first outlet enthalpy value hout1 is determined together.

[0079] For example Figure 5 The diagram shown illustrates the refrigerant circulation enthalpy of an air conditioner according to an embodiment of the present invention. The curves in the diagram represent the corresponding enthalpy values ​​determined based on the fitting relationship between pressure and temperature, with the corrected condenser coil temperature T1+Tx2 and the second exhaust pressure Pp substituted into the equation. Figure 5 The curve is such that point 4 is the intersection of the corrected condenser coil temperature T1+Tx2 and the second exhaust pressure Pp, i.e., P4=Pp, T4=T1+Tx2. The enthalpy value corresponding to this point is determined to be the first outlet enthalpy value hout1.

[0080] In some embodiments, the air conditioner 1 further includes: a suction pressure sensor 18 for detecting the suction pressure at the suction port of the compressor 12; a second coil temperature sensor 19 for detecting the coil temperature of the outdoor heat exchanger 13; when acquiring the second inlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: acquire the first suction pressure, the coil temperature of the outdoor heat exchanger 13, and a third temperature correction value; and determine the second inlet enthalpy value based on the first suction pressure, the coil temperature of the outdoor heat exchanger 13, and the third temperature correction value.

[0081] 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 suction pressure sensor 18 and a second coil temperature sensor 19, wherein the suction pressure sensor 18 is used to detect the suction pressure at the suction port of the compressor 12; and the second coil temperature sensor 19 is used to detect the coil temperature of the outdoor heat exchanger 13.

[0082] The controller 14 obtains the first suction pressure at the suction port of the compressor 12 in real time, for example, denoted as Px, based on the suction pressure sensor 18; the controller 14 obtains the coil temperature of the outdoor heat exchanger 13 in real time, for example, denoted as T1, based on the second coil temperature sensor 19, and obtains the third temperature correction value, for example, denoted as Tx3, preset in the controller 14 based on engineering testing experience, so as to correct the coil temperature T1 of the outdoor heat exchanger 13 according to the third temperature correction value Tx3, that is, the corrected coil temperature of the outdoor heat exchanger 13 is T1+Tx3. Thus, based on the fitting relationship between the corrected coil temperature T1+Tx3 of the outdoor heat exchanger 13 and the first suction pressure Px, the corresponding second inlet enthalpy value hin2 is determined together.

[0083] For example Figure 5 The diagram shown illustrates the refrigerant circulation enthalpy of an air conditioner according to an embodiment of the present invention. The curves in the diagram represent the corresponding enthalpy values ​​determined based on the fitting relationship between pressure and temperature. The corrected coil temperature T1+Tx3 of the outdoor heat exchanger 13 and the first suction pressure Px are then substituted into the equation. Figure 5 The curve is such that the midpoint 5 of the curve is the intersection of the corrected coil temperature T1+Tx3 and the first suction pressure Px of the outdoor heat exchanger 13, i.e., P5=Px, T5=T1+Tx3. The enthalpy value corresponding to this point is determined to be the second inlet enthalpy value hin2.

[0084] In some embodiments, the air conditioner 1 further includes: a suction temperature sensor 20 for detecting the suction temperature at the suction port of the compressor 12; when acquiring the second outlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: acquire a second suction pressure, a first suction temperature, and a fourth temperature correction value; and determine the second outlet enthalpy value based on the second suction pressure, the first suction temperature, and the fourth temperature correction value.

[0085] In embodiments, as shown in FIG. 1, a structure diagram of an air conditioner according to an embodiment of the present application is shown. The air conditioner 1 further comprises: a third capillary tube temperature sensor 21, wherein the third capillary tube temperature sensor 21 is configured to detect a capillary tube temperature of the evaporator. Figure 4

[0086] The controller 14 obtains a second suction pressure, for example, denoted as Px, of the suction port of the compressor 12 in real time according to the suction pressure sensor 18. The controller 14 obtains a first suction temperature, for example, denoted as Tx, of the suction port of the compressor 12 in real time according to the suction temperature sensor 20, and obtains a fourth temperature correction value, for example, denoted as Tx4, preset in the controller 14 according to engineering test experience, so as to correct the first suction temperature Tx according to the fourth temperature correction value Tx4, i.e., the corrected first suction temperature is Tx+Tx4, so as to determine a corresponding second outlet enthalpy value hout2 according to a fitting relationship between the corrected first suction temperature Tx+Tx4 and the second suction pressure Px.

[0087] For example, as shown in FIG. 2, a schematic diagram of refrigerant cycle pressure-enthalpy of the air conditioner according to an embodiment of the present application is shown. The curve in the figure is a corresponding enthalpy value determined according to a fitting relationship between pressure and temperature. The corrected first suction temperature Tx+Tx4 and the second suction pressure Px are brought into the curve, and the midpoint 1 in the curve is an intersection point of the corrected first suction temperature Tx+Tx4 and the second suction pressure Px, i.e., P1=Px, T1=Tx+Tx4, and the enthalpy value corresponding to the point is determined as the second outlet enthalpy value hout2. Figure 5 Figure 5

[0088] In some embodiments, the air conditioner 1 further comprises: a third capillary tube temperature sensor 21 configured to detect a capillary tube temperature of the evaporator. When the mass flow rate of the air conditioner 1 is obtained, the controller 14 is configured to: obtain the capillary tube temperature of the evaporator, the capillary tube temperature of the condenser, and a preset temperature coupling coefficient; and determine the mass flow rate according to the capillary tube temperature of the evaporator, the capillary tube temperature of the condenser, the preset temperature coupling coefficient, and a mass flow rate calculation formula.

[0089] In embodiments, as shown in FIG. 1, a structure diagram of an air conditioner according to an embodiment of the present application is shown. The air conditioner 1 further comprises: a third capillary tube temperature sensor 21, wherein the third capillary tube temperature sensor 21 is configured to detect a capillary tube temperature of the evaporator. Figure 4

[0090] The controller 14 obtains a capillary tube temperature, for example, denoted as Tz, of the evaporator in real time according to the third capillary tube temperature sensor 21. The controller 14 obtains a capillary tube temperature T1 of the condenser in real time according to the first capillary tube temperature sensor 17, and obtains preset temperature coupling coefficients, for example, denoted as C1 to Cn, preset in the controller 14 according to engineering test experience. The controller 14 obtains a mass flow rate of the air conditioner 1 according to the capillary tube temperature Tz of the evaporator, the capillary tube temperature T1 of the condenser, the preset temperature coupling coefficients C1 to Cn, and a mass flow rate calculation formula. 10 ​​​​After obtaining the above parameters, substitute them into the mass flow rate calculation formula to obtain the mass flow rate qm, and then calculate the real-time capacity of air conditioner 1 based on the mass flow rate qm of air conditioner 1.

[0091] In some embodiments, the mass flow rate calculation formula includes:

[0092] qm=C1+C2*T z +C3*T1+C4*T z 2 +C5*T z *T1+C6*T1 2 +C7*T z 3 +C8*T z 2 *T1*C9*T z *T1 2 +C 10 *T1 3

[0093] Where T1 is the coil temperature of the condenser, T z The coil temperature of the evaporator, C1 to C 10 This is the preset temperature coupling coefficient.

[0094] In this embodiment, the evaporator coil temperature Tz, the condenser coil temperature T1, and preset temperature coupling coefficients C1 to C2 are obtained. 10 Then, substitute the above parameters into the mass flow rate calculation formula to obtain the mass flow rate qm. The mass flow rate calculation formula is as follows:

[0095] qm=C1+C2*T z +C3*T1+C4*T z 2 +C5*T z *T1+C6*T1 2 +C7*T z 3 +C8*T z 2 *T1*C9*T z *T1 2 +C 10 *T1 3

[0096] The real-time capacity of air conditioner 1 is calculated based on the mass flow rate qm of air conditioner 1.

[0097] In some embodiments, the formula for calculating the operating power of the compressor includes:

[0098] W = qm × (hout2 - hin1)

[0099] Where W is the operating power, qm is the mass flow rate, hin1 is the second outlet enthalpy, and hout2 is the first inlet enthalpy.

[0100] In this embodiment, after obtaining the mass flow rate qm of the air conditioner 1, the second outlet enthalpy value hout2 and the first inlet enthalpy value hin1 of the outdoor heat exchanger 13, the above parameters are substituted into the compressor operating power calculation formula, which is as follows:

[0101] W = qm × (hout2 - hin1)

[0102] The real-time capacity of the air conditioner 1 is calculated based on the operating power W of the compressor 12.

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

[0104] In the embodiment, the cooling capacity C of air conditioner 1 is obtained. c Or heat output C h Then, controller 14 will set the cooling capacity C c Or heat output C h The data is sent to the user terminal, such as a mobile app, and / or displayed on the screen of air conditioner 1, so that the user can understand the real-time status of air conditioner 1.

[0105] The following is for reference. Figure 5 An example is given to illustrate the capacity calculation method of the air conditioner according to an embodiment of the present invention.

[0106] like Figure 5 Figure 4 Figure 6 Figure 6 As shown, the air conditioner capacity calculation method of this embodiment includes at least steps S11-S28.

[0107] Step S11: Turn on the air conditioner.

[0108] Step S12: Obtain the operating mode of the air conditioner.

[0109] Step S13: Obtain the first exhaust pressure, the first exhaust temperature, and the first temperature correction value.

[0110] Step S14: Determine the first inlet enthalpy value based on the first exhaust pressure, the first exhaust temperature, and the first temperature correction value.

[0111] Step S15: Obtain the second exhaust pressure, the coil temperature of the condenser, and the second temperature correction value.

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

[0113] Step S17, obtaining the first suction pressure, the coil temperature of the outdoor heat exchanger and the third temperature correction value.

[0114] Step S18, determining the second inlet enthalpy value according to the first suction pressure, the coil temperature of the outdoor heat exchanger and the third temperature correction value.

[0115] Step S19, obtaining the second suction pressure, the first suction temperature and the fourth temperature correction value.

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

[0117] Step S21, obtaining the coil temperature of the evaporator, the coil temperature of the condenser and a preset temperature coupling coefficient.

[0118] Step S22, determining the mass flow rate according to the coil temperature of the evaporator, the coil temperature of the condenser, the preset temperature coupling coefficient and a mass flow rate calculation formula.

[0119] Step S23, obtaining a running power calculation formula of the compressor.

[0120] Step S24, determining the running power of the compressor according to the mass flow rate, the second outlet enthalpy value, the first inlet enthalpy value and the running power calculation formula of the compressor.

[0121] Step S25, judging whether the air conditioner is in a cooling running mode, if yes, executing step S27; otherwise, executing step S26.

[0122] Step S26, determining the heating capacity of the air conditioner according to the running power, the mass flow rate, the second inlet enthalpy value, the second outlet enthalpy value and a heating capacity calculation formula of the air conditioner.

[0123] Step S27, determining the cooling capacity of the air conditioner according to the running power, the mass flow rate, the first inlet enthalpy value, the first outlet enthalpy value and a cooling capacity calculation formula of the air conditioner.

[0124] Step S28, 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.

[0125] The air conditioner 1 according to the embodiment of the present application has the device for detecting the enthalpy value of the inlet and outlet on the outdoor side, and after starting operation, 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 are detected by the device on the outdoor side, and the real-time capacity of the air conditioner 1 under different operation modes is calculated in combination with the operation mode of the air conditioner 1, the operation power of the compressor 12 and the mass flow of the air conditioner 1. The inlet and outlet enthalpy values on the outdoor side are detected by the 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 value is greatly affected by the outdoor environment, and without adding extra detection device on the indoor side, thereby reducing the hardware space and hardware cost of the air conditioner 1, and improving the accuracy of the capacity calculation of the air conditioner 1.

[0126] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" 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.

[0127] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application 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, and an evaporator; a compressor configured to compress low-temperature, low-pressure refrigerant gas into high-temperature, 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; an exhaust pressure sensor configured to detect an exhaust pressure of an exhaust port of the compressor; an exhaust temperature sensor configured to detect an exhaust temperature of the exhaust port of the compressor; a first coil temperature sensor configured to detect a coil temperature of the condenser; a controller configured to: obtain an operating mode of the air conditioner, a mass flow rate of the air conditioner, a first inlet enthalpy value of the outdoor heat exchanger, and a first outlet enthalpy value of the outdoor heat exchanger; determine an operating power of the compressor according to a calculation formula of the operating power of the compressor based on the mass flow rate of the air conditioner, the first outlet enthalpy value, the first inlet enthalpy value, and the operating power of the compressor; when the air conditioner is in a cooling mode, determine a cooling capacity of the air conditioner according to a calculation formula of the cooling capacity of the air conditioner based on the operating power, the mass flow rate, the first inlet enthalpy value, the first outlet enthalpy value, and the cooling capacity of the air conditioner; when the first inlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to: obtain a first exhaust pressure, a first exhaust temperature, and a first temperature correction value; determine the first inlet enthalpy value based on the first exhaust pressure, the first exhaust temperature, 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 a second exhaust pressure, a coil temperature of the condenser, and a second temperature correction value; 2. The air conditioner of claim 1, wherein determine the first outlet enthalpy value based on the second exhaust pressure, the coil temperature of the condenser, and the second temperature correction value. wherein, is the first inlet enthalpy value, is the first outlet enthalpy value, is the mass flow rate, the is the operating power of the compressor.

3. The air conditioner of claim 1, wherein The calculation formula of the cooling capacity of the air conditioner comprises: The air conditioner further comprises: a suction pressure sensor configured to detect a suction pressure of a suction port of the compressor; a second coil temperature sensor configured to detect a coil temperature of the outdoor heat exchanger; the controller is further configured to obtain a second inlet enthalpy value and a second outlet enthalpy value of the outdoor heat exchanger, comprising: obtaining a first suction pressure, a coil temperature of the outdoor heat exchanger, and a third temperature correction value; determining the second inlet enthalpy value based on the first suction pressure, the coil temperature of the outdoor heat exchanger, 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 a calculation formula of the heating capacity of the air conditioner based on the operating power, the mass flow rate, the second inlet enthalpy value, the second outlet enthalpy value, and the heating capacity of the air conditioner; wherein, is the second inlet enthalpy value, is the second outlet enthalpy value, is the mass flow rate, the is the operating power of the compressor.

4. The air conditioner of claim 3, wherein The calculation formula of the heating capacity of the air conditioner comprises: The air conditioner further comprises: a suction temperature sensor configured to detect a suction temperature of the suction port of the compressor; when the second outlet enthalpy value of the outdoor heat exchanger is obtained, the controller is configured to: obtain a second suction pressure, a first suction temperature, and a fourth temperature correction value; 5. The air conditioner of claim 1, wherein determine the second outlet enthalpy value based on the second suction pressure, the first suction temperature, and the fourth temperature correction value. The air conditioner further comprises: a third coil temperature sensor configured to detect a coil temperature of the evaporator; When acquiring the mass flow of the air conditioner, the controller is configured to: acquire a coil temperature of the evaporator, a coil temperature of the condenser, and a preset temperature coupling coefficient; determine the mass flow according to the coil temperature of the evaporator, the coil temperature of the condenser, the preset temperature coupling coefficient, and a mass flow calculation formula.

6. The air conditioner of claim 5, wherein The mass flow calculation formula comprises: Wherein, the is the coil temperature of the condenser, the is the coil temperature of the evaporator, the to is the preset temperature coupling coefficient.

7. The air conditioner of claim 1, wherein The operation power calculation formula of the compressor comprises: wherein, is the operating power, is the mass flow rate, is the second outlet enthalpy value, is the first inlet enthalpy value.

8. 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 the refrigerating or heating capacity on a display screen of the air conditioner.

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