Air conditioner

Abstract

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

Description

Technical Field

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

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

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

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

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

[0006] In order to achieve the above-mentioned object, an embodiment of the first aspect of the present invention provides an air conditioner, the air conditioner comprising: a refrigerant circulation loop, so that the refrigerant circulates in the compressor, the condenser and the evaporator in the circulation loop; a compressor, used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; an outdoor heat exchanger, which performs heat exchange between the refrigerant flowing inside and the air; a controller, which is configured to: obtain the operation 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; The operating power of the compressor is determined 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, the cooling capacity of the air conditioner is determined 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, the heating capacity of the air conditioner is determined 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] According to the air conditioner of the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, the existing device on the outdoor side is used to detect the inlet and outlet enthalpy values, such as the first inlet enthalpy value, the first outlet enthalpy value, the second inlet enthalpy value and the second outlet enthalpy value of the outdoor heat exchanger, and the real-time capacity of the air conditioner under different operating modes is calculated in combination with the operating mode of the air conditioner, the operating power of the compressor and the mass flow rate of the air conditioner. The inlet and outlet enthalpy values ​​on the outdoor side are detected by the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, the accuracy of the air conditioner capacity calculation is improved while reducing the hardware space occupied and the hardware cost of the air conditioner.

[0008] In some embodiments, the refrigeration capacity calculation formula includes:

[0009] C c =|hin1-hout1|×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 includes:

[0012] C h =|hin2-hout2|×qm+W

[0013] Among them, 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 also includes: an exhaust pressure sensor for detecting the exhaust pressure at the exhaust port of the compressor; an exhaust temperature sensor for detecting the exhaust temperature at the exhaust port of the compressor; when obtaining the first inlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the first exhaust pressure, the first exhaust temperature and the 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.

[0015] In some embodiments, the air conditioner also includes: a first coil temperature sensor for detecting the coil temperature of the condenser; when obtaining the first outlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the second exhaust pressure, the coil temperature of the condenser and the second temperature correction value; determine the first outlet enthalpy value based on the second exhaust pressure, the coil temperature of the condenser and the second temperature correction value.

[0016] In some embodiments, the air conditioner also includes: an intake pressure sensor for detecting the intake pressure of the compressor intake port; a second coil temperature sensor for detecting the coil temperature of the outdoor heat exchanger; when obtaining the second inlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the first intake pressure, the coil temperature of the outdoor heat exchanger and the third temperature correction value; determine the second inlet enthalpy value based on the first intake pressure, the coil temperature of the outdoor heat exchanger and the third temperature correction value.

[0017] In some embodiments, the air conditioner also includes: an intake temperature sensor for detecting the intake temperature of the compressor intake port; when obtaining the second outlet enthalpy value of the outdoor heat exchanger, the controller is configured to: obtain the second intake pressure, the first intake temperature, and the fourth temperature correction value; determine the second outlet enthalpy value based on the second intake pressure, the first intake temperature and the fourth temperature correction value.

[0018] In some embodiments, the air conditioner also includes: a third coil temperature sensor for detecting the coil temperature of the evaporator; when obtaining the mass flow of the air conditioner, the controller is configured to: obtain the coil temperature of the evaporator, the 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 the mass flow calculation formula.

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

[0020] qm=C 1 +C 2 *T z +C 3 *T 1 +C 4 *T z 2 +C 5 *T z *T 1 +C 6 *T 1 2 +C 7 *T z 3 +C 8 *T z 2 *T 1 *C 9 *T z *T 1 2 +C 10 *T 1 3

[0021] Among them, the T 1 is the coil temperature of the condenser, the T z is the coil temperature of the evaporator, the C 1 to C 10 is the preset temperature coupling coefficient.

[0022] In some embodiments, the operating power calculation formula of the compressor includes:

[0023] W=qm×(hout2-hin1)

[0024] Wherein, W is the operating power, qm is the mass flow rate, 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 cooling capacity or heating capacity to a user terminal and / or display it on a display screen of the air conditioner.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

[0029] Figure 2 is a flow chart of a method for calculating the cooling capacity of an air conditioner according to an embodiment of the present invention;

[0030] Figure 3 is a flow chart of a method for calculating the heating capacity of an air conditioner according to an embodiment of the present invention;

[0031] Figure 4 is a structural schematic diagram of an air conditioner according to a specific embodiment of the present invention;

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

[0033] Figure 6 is a flow chart of a method for calculating the capacity of an air conditioner according to an embodiment of the present invention.

[0034] Reference numerals: air conditioner 1;

[0035] Refrigerant circulation loop 11; compressor 12; outdoor heat exchanger 13; controller 14; exhaust pressure sensor 15; exhaust 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 invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0037] The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0038] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0039] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-temperature and low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0040] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

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

[0043] like Figure 1 As shown, the air conditioner 1 of the embodiment of the present invention comprises: a refrigerant circulation loop 11, a compressor 12, an outdoor heat exchanger 13 and a controller 14, wherein:

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

[0045] In the embodiment, after the air conditioner 1 is turned on and operated, the controller 14 obtains the operating mode of the air conditioner 1 in real time, and the operating mode includes, for example, a cooling operating mode and a heating operating mode; the mass flow rate of the air conditioner 1 is obtained, for example, recorded as qm. Since the inlet and outlet enthalpy values ​​of the outdoor heat exchanger 13 change when heat is exchanged between the refrigerant flowing inside and the air, the first inlet enthalpy value of the outdoor heat exchanger 13 is obtained, for example, recorded as hin1, the first outlet enthalpy value is recorded as hout1, the second inlet enthalpy value is recorded as hin2, and the second outlet enthalpy value is recorded as hout2.

[0046] After obtaining the above parameters, the mass flow 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 are substituted into the compressor operating power calculation formula to determine the operating power of the compressor 12, for example, recorded as W.

[0047] After determining the operating frequency W of the compressor 12, the capacity calculation formula of the air conditioner 1 is used in combination with the above parameters to determine the capacity of the air conditioner 1 corresponding to different operating modes. For example, when the operating mode of the air conditioner 1 is in the cooling operating mode, the outdoor heat exchanger 13 is used as a condenser. Then, according to the operating power W of the compressor 12, the mass flow rate qm of the air conditioner 1, the first inlet enthalpy value hin1 of the outdoor heat exchanger 13, the first outlet enthalpy value hout1 and the refrigeration capacity calculation formula of the air conditioner 1, the refrigeration capacity of the air conditioner 1 is determined, for example, recorded as C c When the operation mode of the air conditioner 1 is in the heating operation mode, the outdoor heat exchanger 13 is used as an evaporator. The heating capacity of the air conditioner 1 is determined according to the operating 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, the second outlet enthalpy value hout2 and the heating capacity calculation formula of the air conditioner 1, for example, C h , to determine the real-time capability of the air conditioner 1 under different operating modes.

[0048] Reference below Figure 2 A method for calculating the cooling capacity of an air conditioner according to an embodiment of the present invention is described.

[0049] Step S11, the air conditioner is turned on and operated.

[0050] Step S121, obtaining the operating mode of the air conditioner, the operating power of the compressor, the mass flow 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.

[0051] Step S25, determining whether the air conditioner is in cooling operation mode, if so, executing step S27; otherwise, executing step S121.

[0052] Step S27, determining the cooling capacity of the air conditioner according to the operating power, mass flow, the first inlet enthalpy value, the first outlet enthalpy value and the cooling capacity calculation formula of the air conditioner.

[0053] Reference below Figure 3 A method for calculating the heating amount of an air conditioner according to an embodiment of the present invention is described.

[0054] Step S11, the air conditioner is turned on and operated.

[0055] Step S121, obtaining the operating mode of the air conditioner, the operating power of the compressor, the mass flow 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.

[0056] Step S25, determining whether the air conditioner is in cooling operation mode, if so, executing step S121; otherwise, executing step S26.

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

[0058] According to the air conditioner 1 of the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, after the air conditioner is turned on and operated, the inlet and outlet enthalpy values ​​are detected by 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, and the real-time capacity of the air conditioner 1 under different operating modes is calculated in combination with the operating mode of the air conditioner 1, the operating power of the compressor 12, and the mass flow rate of the air conditioner 1. The inlet and outlet enthalpy values ​​on the outdoor side are detected by using the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner 1, the accuracy of the capacity calculation of the air conditioner 1 is improved.

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

[0060] C c =|hin1-hout1|×qm-W

[0061] 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 12;

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

[0063] C c =|hin1-hout1|×qm-W

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

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

[0066] C h =|hin2-hout2|×qm+W

[0067] Among them, 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 12.

[0068] In the embodiment, after obtaining the second inlet enthalpy value hin2 of the outdoor heat exchanger 13, 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, the above parameters are substituted into the heating capacity calculation formula of the air conditioner 1 to obtain the heating capacity of the air conditioner 1, for example, recorded as C h , the heating capacity calculation formula is as follows:

[0069] C h =|hin2-hout2|×qm+W

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

[0071] By calculating the cooling capacity C of air conditioner 1 c and heating capacity C h , thereby determining the real-time capacity of the air conditioner 1 when it is in different operating modes, and using the refrigerant enthalpy difference method to calculate the real-time capacity, reducing the interference of the ambient temperature, and improving the accuracy of the capacity calculation of the air conditioner 1, making the capacity calculation of the air conditioner 1 more convenient and accurate.

[0072] In some embodiments, the air conditioner 1 also includes: an exhaust pressure sensor 15, used to detect the exhaust pressure at the exhaust port of the compressor 12; an exhaust temperature sensor 16, used to detect the exhaust temperature at the exhaust port of the compressor 12; when obtaining the first inlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the first exhaust pressure, the first exhaust temperature and the 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.

[0073] In an embodiment, Figure 4 The air conditioner 1 further comprises an exhaust pressure sensor 15 and an exhaust temperature sensor 16, wherein the exhaust pressure sensor 15 is used to detect the exhaust pressure at the exhaust port of the compressor 12; and the exhaust temperature sensor 16 is used to detect the exhaust temperature at the exhaust port of the compressor 12.

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

[0075] For example Figure 5 The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected first exhaust temperature Tp-Tx1 and the first exhaust pressure Pp are brought into Figure 5 The midpoint 2 of the curve is the intersection of the corrected first exhaust temperature Tp-Tx1 and the first exhaust pressure Pp, that is, P2=Pp, T2=Tp-Tx1, and 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 also includes: a first coil temperature sensor 17, used to detect the coil temperature of the condenser; when obtaining the first outlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the second exhaust pressure, the coil temperature of the condenser and the second temperature correction value; 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, Figure 4 FIG. 1 is a schematic diagram of the structure of an air conditioner according to a specific embodiment of the present invention. The air conditioner 1 further comprises: a first coil temperature sensor 17, wherein the first coil temperature sensor 17 is used to detect the coil temperature of the condenser.

[0078] The controller 14 obtains the second exhaust pressure in real time according to the exhaust pressure sensor 15, for example, recorded as Pp; the controller 14 obtains the coil temperature of the condenser in real time according to the first coil temperature sensor 17, for example, recorded as T1, and obtains the second temperature correction value preset in the controller 14 according to engineering test experience, for example, recorded as Tx2, so as to correct the coil temperature T1 of the condenser according to the second temperature correction value Tx2, that is, the corrected coil temperature of the condenser is T1+Tx2, so as to jointly determine the corresponding first outlet enthalpy value hout1 according to the fitting relationship between the corrected coil temperature T1+Tx2 of the condenser and the second exhaust pressure Pp.

[0079] For example Figure 5The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected condenser coil temperature T1+Tx2 and the second exhaust pressure Pp are brought into Figure 5 The midpoint 4 of the curve is the intersection of the corrected condenser coil temperature T1+Tx2 and the second exhaust pressure Pp, that is, P4=Pp, T4=T1+Tx2, and 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 also includes: an intake pressure sensor 18, which is used to detect the intake pressure of the intake port of the compressor 12; a second coil temperature sensor 19, which is used to detect the coil temperature of the outdoor heat exchanger 13; when obtaining the second inlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the first intake pressure, the coil temperature of the outdoor heat exchanger 13 and the third temperature correction value; determine the second inlet enthalpy value according to the first intake pressure, the coil temperature of the outdoor heat exchanger 13 and the third temperature correction value.

[0081] In an embodiment, Figure 4 FIG. 1 is a schematic diagram of the structure of an air conditioner according to a specific embodiment of the present invention. The air conditioner 1 further includes: an air intake pressure sensor 18 and a second coil temperature sensor 19, wherein the air intake pressure sensor 18 is used to detect the air intake pressure of the air intake 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 of the suction port of the compressor 12 in real time according to the suction pressure sensor 18, for example, recorded as Px; the controller 14 obtains the coil temperature of the outdoor heat exchanger 13 in real time according to the second coil temperature sensor 19, for example, recorded as T1, and obtains the third temperature correction value preset in the controller 14 according to engineering test experience, for example, recorded as Tx3, 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, so that the corresponding second inlet enthalpy value hin2 is jointly determined according to the fitting relationship between the corrected coil temperature T1+Tx3 of the outdoor heat exchanger 13 and the first suction pressure Px.

[0083] For example Figure 5 The figure is a schematic diagram of the pressure enthalpy of the refrigerant cycle of the air conditioner according to an embodiment of the present invention. The curve in the figure is the corresponding enthalpy value determined according to the fitting relationship between pressure and temperature. The corrected coil temperature T1+Tx3 of the outdoor heat exchanger 13 and the first suction pressure Px are brought into Figure 5The midpoint 5 of the curve is the intersection of the corrected coil temperature T1+Tx3 of the outdoor heat exchanger 13 and the first suction pressure Px, that is, P5=Px, T5=T1+Tx3, and 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 also includes: an intake temperature sensor 20, which is used to detect the intake temperature of the intake port of the compressor 12; when obtaining the second outlet enthalpy value of the outdoor heat exchanger 13, the controller 14 is configured to: obtain the second intake pressure, the first intake temperature, and the fourth temperature correction value; determine the second outlet enthalpy value based on the second intake pressure, the first intake temperature and the fourth temperature correction value.

[0085] In an embodiment, Figure 4 The air conditioner 1 further comprises an air intake temperature sensor 20 , wherein the air intake temperature sensor 20 is used to detect the air intake temperature of the air intake port of the compressor 12 .

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

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

[0088] In some embodiments, the air conditioner 1 also includes: a third coil temperature sensor 21, which is used to detect the coil temperature of the evaporator; when obtaining the mass flow of the air conditioner 1, the controller 14 is configured to: obtain the coil temperature of the evaporator, the coil temperature of the condenser and the 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 the mass flow calculation formula.

[0089] In an embodiment, Figure 4 FIG. 1 is a schematic diagram of the structure of an air conditioner according to a specific embodiment of the present invention. The air conditioner 1 further comprises: a third coil temperature sensor 21, wherein the third coil temperature sensor 21 is used to detect the coil temperature of the evaporator.

[0090] The controller 14 obtains the coil temperature of the evaporator in real time according to the third coil temperature sensor 21, for example, recorded as Tz, and the controller 14 obtains the coil temperature T1 of the condenser in real time according to the first coil temperature sensor 17, and obtains the preset temperature coupling coefficient preset in the controller 14 according to engineering test experience, for example, recorded as C 1 to C 10 After obtaining the above parameters, the above parameters are substituted into the mass flow calculation formula to obtain the mass flow qm, thereby calculating the real-time capacity of the air conditioner 1 according to the mass flow qm of the air conditioner 1.

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

[0092] qm=C 1 +C 2 *T z +C 3 *T 1 +C 4 *T z 2 +C 5 *T z *T 1 +C 6 *T 1 2 +C 7 *T z 3 +C 8 *T z 2 *T 1 *C 9 *T z *T 1 2 +C 10 *T 1 3

[0093] Among them, T 1 is the coil temperature of the condenser, T z is the coil temperature of the evaporator, C 1 to C 10 is the preset temperature coupling coefficient.

[0094] In the embodiment, the coil temperature Tz of the evaporator, the coil temperature T1 of the condenser and the preset temperature coupling coefficient C are obtained. 1 to C10 Finally, the above parameters are substituted into the mass flow calculation formula to obtain the mass flow qm. The mass flow calculation formula is as follows:

[0095] qm=C 1 +C 2 *T z +C 3 *T 1 +C 4 *T z 2 +C 5 *T z *T 1 +C 6 *T 1 2 +C 7 *T z 3 +C 8 *T z 2 *T 1 *C 9 *T z *T 1 2 +C 10 *T 1 3

[0096] By calculating the mass flow rate qm of the air conditioner 1 , the real-time capacity of the air conditioner 1 is calculated according to the mass flow rate qm of the air conditioner 1 .

[0097] In some embodiments, the operating power calculation formula 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 value, and hout2 is the first inlet enthalpy value.

[0100] In the 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 operating power calculation formula of the compressor, and the operating power calculation formula of the compressor is as follows:

[0101] W=qm×(hout2-hin1)

[0102] 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 .

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

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

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

[0106] like Figure 6 As shown, the capacity calculation method of the air conditioner according to the embodiment of the present invention at least includes steps S11 to S28.

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

[0108] Step S12, obtaining the operating mode of the air conditioner.

[0109] Step S13, obtaining a first exhaust pressure, a first exhaust temperature and a first temperature correction value.

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

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

[0112] Step S16, determining a 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 a 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 intake pressure, the first intake temperature, and the fourth temperature correction value.

[0116] Step S20, determining a second outlet enthalpy value according to the second intake pressure, the first intake 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, a preset temperature coupling coefficient and a mass flow rate calculation formula.

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

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

[0121] Step S25, determining whether the air conditioner is in cooling operation mode, if so, executing step S27; otherwise, executing step S26.

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

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

[0124] Step S28, sending the cooling capacity or heating capacity to the user terminal and / or displaying it on the display screen of the air conditioner.

[0125] According to the air conditioner 1 of the embodiment of the present invention, since there is a device for detecting the inlet and outlet enthalpy values ​​on the outdoor side, after the air conditioner is turned on and operated, the inlet and outlet enthalpy values ​​are detected by 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, and the real-time capacity of the air conditioner 1 under different operating modes is calculated in combination with the operating mode of the air conditioner 1, the operating power of the compressor 12, and the mass flow rate of the air conditioner 1. The inlet and outlet enthalpy values ​​on the outdoor side are detected by using the existing device outdoors, and there is no need to detect the inlet and outlet air enthalpy values ​​on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and there is no need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner 1, the accuracy of the capacity calculation of the air conditioner 1 is improved.

[0126] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0127] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

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

2. The air conditioner according to claim 1, characterized in that: The refrigeration capacity calculation formula includes: C c =|hin1-hout1|×qm-W 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; The heating capacity calculation formula includes: C h =|hin2-hout2|×qm+W Among them, 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.

3. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: An exhaust pressure sensor, used to detect the exhaust pressure at the exhaust port of the compressor; An exhaust temperature sensor, used to detect the exhaust temperature at the exhaust port of the compressor; When obtaining the first inlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Acquiring a first exhaust pressure, a first exhaust temperature, and a first temperature correction value; The first inlet enthalpy value is determined according to the first exhaust pressure, the first exhaust temperature, and the first temperature correction value.

4. The air conditioner according to claim 3, characterized in that: The air conditioner also includes: A first coil temperature sensor, used to detect the coil temperature of the condenser; When obtaining the first outlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Obtaining a second exhaust pressure, a coil temperature of the condenser, and a second temperature correction value; The first outlet enthalpy value is determined according to the second exhaust pressure, the coil temperature of the condenser and a second temperature correction value.

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

6. The air conditioner according to claim 5, characterized in that: The air conditioner also includes: A suction temperature sensor, used to detect the suction temperature of the suction port of the compressor; When obtaining the second outlet enthalpy value of the outdoor heat exchanger, the controller is configured as follows: Obtaining a second suction pressure, a first suction temperature, and a fourth temperature correction value; The second outlet enthalpy value is determined according to the second intake air pressure, the first intake air temperature, and the fourth temperature correction value.

7. The air conditioner according to claim 4, characterized in that: The air conditioner also includes: A third coil temperature sensor, used for detecting the coil temperature of the evaporator; When obtaining the mass flow of the air conditioner, the controller is configured as follows: Obtaining the coil temperature of the evaporator, the coil temperature of the condenser and a preset temperature coupling coefficient; The mass flow rate is determined 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.

8. The air conditioner according to claim 7, characterized in that: The mass flow calculation formula includes: 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 Wherein, T1 is the coil temperature of the condenser, and T z is the coil temperature of the evaporator, the C1 to C 10 is the preset temperature coupling coefficient.

9. The air conditioner according to claim 1, characterized in that: The operating power calculation formula of the compressor includes: W=qm×(hout2-hin1) Wherein, W is the operating power, qm is the mass flow rate, hin1 is the second outlet enthalpy value, and hout2 is the first inlet enthalpy value.

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

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