Air conditioner

Abstract

The invention provides an air conditioner which comprises a controller configured to obtain an operation mode, a first air inlet temperature, a first air outlet temperature, a second air inlet temperature, a second air outlet temperature, a first relative humidity, a second relative humidity and an air mass flow rate of the air conditioner; when the air conditioner is in a refrigeration mode, the refrigerating capacity of the air conditioner is determined according to the first relative humidity, the first air inlet temperature, the first air outlet temperature, the air mass flow and an air conditioner refrigerating capacity calculation formula; when the air conditioner is in the heating mode, the heating capacity of the air conditioner is determined according to the second relative humidity, the second air inlet temperature, the second air outlet temperature, the air mass flow and the air conditioner heating capacity calculation formula, the problem that the air enthalpy value is greatly influenced by the outdoor environment is avoided, an additional detection device does not need to be additionally arranged on the indoor side, and therefore the heating capacity of the air conditioner is improved. The hardware occupied space and the hardware cost of the air conditioner are reduced, and meanwhile the capacity calculation accuracy of the air conditioner 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 devices to detect the inlet and outlet air temperature and humidity, without the need to detect the inlet and outlet air enthalpy value on the outdoor side, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment, and without the need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner, the accuracy of the air conditioner capacity calculation is improved.

[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 compressor, which is used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to a condenser; an indoor heat exchanger, which works as an evaporator during cooling and as the condenser during heating; an indoor temperature sensor, which is used to detect the indoor inlet air temperature; a coil temperature sensor, which is used to detect the outlet air temperature of the indoor heat exchanger; an indoor humidity sensor, which is used to detect the relative humidity on the indoor side; a controller, which is configured to: obtain the operation mode, the first inlet air temperature, the first outlet air temperature, the second inlet air temperature, the second outlet air temperature, the first relative humidity, the second relative humidity and the air mass flow of the air conditioner; when the air conditioner is in the cooling mode, the cooling capacity of the air conditioner is determined according to the first relative humidity, the first inlet air temperature, the first outlet air temperature, the air mass flow and the air conditioner cooling capacity calculation formula; when the air conditioner is in the heating mode, the heating capacity of the air conditioner is determined according to the second relative humidity, the second inlet air temperature, the second outlet air temperature, the air mass flow and the air conditioner heating capacity calculation formula.

[0007] According to the air conditioner of the embodiment of the present invention, since the air conditioner has a device for detecting the inlet and outlet air temperatures and humidity, the existing device is used to obtain the first inlet air temperature, the first outlet air temperature, the second inlet air temperature, the second outlet air temperature, the first relative humidity and the second relative humidity of the indoor heat exchanger, and the real-time capacity of the air conditioner under different operating modes is calculated in combination with the operating mode and air mass flow of the air conditioner. The inlet and outlet air temperatures and humidity are detected by the existing device, and there is no need to detect the outdoor inlet and outlet air enthalpy values, thereby avoiding the problem that the air enthalpy value is greatly affected by the outdoor environment. There is also no need to add additional detection devices on the indoor side. Therefore, while reducing the hardware space occupied and the hardware cost of the air conditioner, the accuracy of the air conditioner capacity calculation is improved.

[0008] In some embodiments, when the air conditioner is in cooling mode, when the cooling capacity of the air conditioner is determined according to the first relative humidity, the first inlet air temperature, the first outlet air temperature, the air mass flow rate and the air conditioner cooling capacity calculation formula, the controller is configured to: obtain the first inlet air humidity content and the first outlet air humidity content according to the first relative humidity; determine the first enthalpy difference absolute value according to the first inlet air humidity content, the first outlet air humidity content, the first inlet air temperature and the first outlet air temperature; determine the cooling capacity of the air conditioner according to the first enthalpy difference absolute value, the air mass flow rate and the air conditioner cooling capacity calculation formula.

[0009] In some embodiments, when obtaining the first inlet air humidity content or the first outlet air humidity content according to the first relative humidity, the controller is configured to: obtain the first saturated water vapor pressure, the second saturated water vapor pressure and the standard atmospheric pressure; obtain the first inlet air humidity content according to the first saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure; obtain the first outlet air humidity content according to the second saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure.

[0010] In some embodiments, when determining the first enthalpy difference absolute value based on the first inlet air humidity content, the first outlet air humidity content, the first inlet air temperature and the first outlet air temperature, the controller is configured to: determine the first indoor inlet side air enthalpy value based on the first inlet air humidity content and the first inlet air temperature; determine the first indoor outlet side air enthalpy value based on the first outlet air humidity content and the first outlet air temperature; determine the first enthalpy difference absolute value based on the first indoor inlet side air enthalpy value, the first indoor outlet side air enthalpy value and the first enthalpy difference calculation formula.

[0011] In some embodiments, the first enthalpy difference calculation formula includes:

[0012] |h in1 -hout1 |=c pg *(t in1 -t out1 )+c pq *(t in1 *d in1 -t out1 *d out1 )+2500*(d in1 -d out1 )

[0013] Among them, |h in1 -h out1 | is the absolute value of the first enthalpy difference, h in is the air enthalpy value on the first indoor air inlet side, h out is the air enthalpy value at the first indoor outlet side, t in1 is the first inlet air temperature, t out1 is the first outlet air temperature, d in1 is the first inlet air humidity, d out1 is the humidity content of the first outlet air, c pg is the constant pressure specific heat of dry air, c pq is the specific heat of water vapor at constant pressure.

[0014] In some embodiments, when the air conditioner is in heating mode, when the heating capacity of the air conditioner is determined according to the second relative humidity, the second inlet air temperature, the second outlet air temperature, the air mass flow rate and the air conditioner heating capacity calculation formula, the controller is configured to: obtain the second inlet air humidity content and the second outlet air humidity content according to the second relative humidity; determine the second enthalpy difference absolute value according to the second inlet air humidity content, the second outlet air humidity content, the second inlet air temperature and the second outlet air temperature; determine the cooling capacity of the air conditioner according to the second enthalpy difference absolute value, the air mass flow rate and the air conditioner cooling capacity calculation formula.

[0015] In some embodiments, when obtaining the second inlet air humidity content or the second outlet air humidity content according to the first relative humidity, the controller is configured to: obtain a third saturated water vapor pressure, a fourth saturated water vapor pressure and a standard atmospheric pressure; obtain the second inlet air humidity content according to the third saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure; obtain the second outlet air humidity content according to the fourth saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure.

[0016] In some embodiments, when the second enthalpy difference absolute value is determined based on the second inlet air humidity content, the second outlet air humidity content, the second inlet air temperature and the second outlet air temperature, the controller is configured to: determine the second indoor inlet side air enthalpy value based on the second inlet air humidity content and the second inlet air temperature; determine the second indoor outlet side air enthalpy value based on the second outlet air humidity content and the second outlet air temperature; determine the second enthalpy difference absolute value based on the second indoor inlet side air enthalpy value, the second indoor outlet side air enthalpy value and the second enthalpy difference calculation formula.

[0017] In some embodiments, the second enthalpy difference calculation formula includes:

[0018] |h in2 -h out2 |=c pg *(t out2 -t in2 )+c pq *d*(t out2 -t in2 )

[0019] Among them, |h in2 -h out2 | is the absolute value of the second enthalpy difference, h in2 is the air enthalpy value on the inlet side of the second room, h out2 is the second outlet air humidity content, t out2 is the second outlet air temperature, t in2 is the second inlet air temperature, c pg is the constant pressure specific heat of dry air, c pq is the constant-pressure specific heat of water vapor, and d is the moisture content of the air.

[0020] In some embodiments, the cooling capacity calculation formula includes:

[0021] C 制冷量 =|h in1 -h out1 |*q m *α*10 3

[0022] Among them, |h in1 -h out1 | is the absolute value of the first enthalpy difference, the q m is the air mass flow rate, and α is the capacity correction coefficient;

[0023] The heating calculation formula includes:

[0024] C 制热量 =|h in2 -h out2 |*qm *α*10 3

[0025] Among them, |h in2 -h out2 | is the absolute value of the second enthalpy difference, the q m is the air mass flow rate, and α is the capacity correction coefficient.

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

[0032] Figure 5 is a flow chart of a method for calculating the heating capacity of an air conditioner according to an embodiment of the present invention;

[0033] Figure 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] Compressor 11; indoor heat exchanger 12; indoor temperature sensor 13; coil temperature sensor 14; indoor humidity sensor 15; controller 16. 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 compressor 11, an indoor heat exchanger 12, an indoor temperature sensor 13, a coil temperature sensor 14, an indoor humidity sensor 15 and a controller 16, wherein:

[0044] The compressor 11 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 indoor heat exchanger 12 works as an evaporator during cooling and as a condenser during heating; the indoor temperature sensor 13 is used to detect the indoor air inlet temperature; the coil temperature sensor 14 is used to detect the air outlet temperature of the indoor heat exchanger 12; the indoor humidity sensor 15 is used to detect the relative humidity on the indoor side; the controller 16 is configured to: obtain the operation mode of the air conditioner 1, the first air inlet temperature, the first air outlet temperature, the second air inlet temperature, the second air outlet temperature, the first relative humidity, the second relative humidity and the air mass flow rate; when the air conditioner 1 is in the cooling mode, the cooling capacity of the air conditioner 1 is determined according to the first relative humidity, the first air inlet temperature, the first air outlet temperature, the air mass flow rate and the air conditioner 1 cooling capacity calculation formula; when the air conditioner 1 is in the heating mode, the heating capacity of the air conditioner 1 is determined according to the second relative humidity, the second air inlet temperature, the second air outlet temperature, the air mass flow rate and the air conditioner 1 heating capacity calculation formula.

[0045] In the embodiment, after the air conditioner 1 is turned on, the controller 16 obtains the operation mode of the air conditioner 1 in real time, and the operation mode includes, for example, a cooling operation mode and a heating operation mode; the first inlet air temperature is obtained in real time according to the indoor temperature sensor 13, for example, t in1 and the second inlet air temperature is denoted as t in2 , the first outlet air temperature is obtained in real time according to the coil temperature sensor 14, for example, denoted as t out1 and the second outlet air temperature is denoted as t out2 According to the indoor humidity sensor 15, the first relative humidity is obtained in real time, for example, and the second relative humidity is recorded as Get the air mass flow rate, for example, denoted as q m The air inlet temperature, air outlet temperature and indoor relative humidity of the air conditioner 1 are detected by existing devices, thereby reducing the difficulty of collecting data and expanding the application scope of the air conditioner 1.

[0046] It can be understood that the air mass flow rate q m It is the product of air density ρ and air volume V, that is, q m =ρ×V, where air density ρ(m 3 / s) is written into the controller 16 as a preset value according to the operating environment of different installation areas, and the air volume V (Kg / m 3 ) According to the high, medium and low windshields set by the user, the corresponding preset air volume values ​​are written into the controller 16.

[0047] After obtaining the above parameters, the capacity calculation formula of the air conditioner 1 is used and combined 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 mode, the indoor heat exchanger 12 works as an evaporator when cooling, then the first relative humidity , first inlet air temperature t in1 , first outlet air temperature t out1 and air mass flow rate q m Substitute the cooling capacity calculation formula of air conditioner 1 to determine the cooling capacity of air conditioner 1, for example, denoted as C 制冷量 When the operation mode of the air conditioner 1 is in the heating operation mode, the indoor heat exchanger 12 is working as a condenser when heating, then the second relative humidity Second inlet air temperature t in2 and the second outlet air temperature t out2 and air mass flow rate q m Substitute the heating calculation formula of air conditioner 1 to determine the heating capacity of air conditioner 1, for example, record it as C 制热量 , thereby determining 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 S12, obtaining the operation mode, the first air inlet temperature, the first air outlet temperature, the second air inlet temperature, the second air outlet temperature, the first relative humidity, the second relative humidity and the air mass flow of the air conditioner.

[0051] Step S13, determining whether the air conditioner is in cooling operation mode, if so, executing step S20; otherwise, executing step S12.

[0052] Step S20, determining the cooling capacity of the air conditioner according to the first relative humidity, the first air inlet temperature, the first air outlet temperature, the air mass flow rate and the air conditioner cooling capacity calculation formula.

[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 S12, obtaining the operation mode, the first air inlet temperature, the first air outlet temperature, the second air inlet temperature, the second air outlet temperature, the first relative humidity, the second relative humidity and the air mass flow of the air conditioner.

[0056] Step S13, determining whether the air conditioner is in cooling operation mode, if so, executing step S12; otherwise, executing step S27.

[0057] Step S27, determining the heating capacity of the air conditioner according to the second relative humidity, the second air inlet temperature, the second air outlet temperature, the air mass flow rate and the air conditioner heating capacity calculation formula.

[0058] According to the air conditioner 1 of the embodiment of the present invention, since the air conditioner 1 has a device for detecting the inlet and outlet air temperatures and humidity, after being turned on, the first inlet air temperature, the first outlet air temperature, the second inlet air temperature, the second outlet air temperature, the first relative humidity and the second relative humidity of the indoor heat exchanger 12 are obtained by using the existing device, and the real-time capacity of the air conditioner 1 under different operating modes is calculated in combination with the operating mode and air mass flow of the air conditioner 1. The inlet and outlet air temperatures and humidity are detected by using the existing device, and there is no need to detect the outdoor inlet and outlet air enthalpy values, 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, when the air conditioner 1 is in cooling mode, when the cooling capacity of the air conditioner 1 is determined according to the first relative humidity, the first inlet air temperature, the first outlet air temperature, the air mass flow rate and the cooling capacity calculation formula of the air conditioner 1, the controller 16 is configured to: obtain the first inlet air humidity content and the first outlet air humidity content according to the first relative humidity; determine the first enthalpy difference absolute value according to the first inlet air humidity content, the first outlet air humidity content, the first inlet air temperature and the first outlet air temperature; determine the cooling capacity of the air conditioner 1 according to the first enthalpy difference absolute value, the air mass flow rate and the cooling capacity calculation formula of the air conditioner 1.

[0060] In an embodiment, Figure 4 FIG. 1 is a flow chart of a method for calculating the cooling capacity of an air conditioner according to an embodiment of the present invention. When the operation mode of the air conditioner 1 is in the cooling operation mode, the indoor heat exchanger 12 works as an evaporator during cooling, and while cooling the air, water vapor in the air is adsorbed onto the surface of the heat exchanger. Therefore, the refrigeration process reduces the temperature while reducing the air humidity. Therefore, the enthalpy difference change of the air during the refrigeration process requires the calculation of the enthalpy difference change of the wet air, that is, the sum of the enthalpy difference change of the dry air and the enthalpy difference change of the water vapor. Then, according to the first relative humidity Get the first inlet air humidity, for example, record it as d in1 The humidity of the first outlet air is denoted as d out1 , according to the first inlet air humidity d in1 , humidity content of first outlet air d out1 , first inlet air temperature t in1 and the first outlet air temperature tout1 Determine the absolute value of the first enthalpy difference, for example, denoted as |h in1 -h out1 |, the absolute value of the first enthalpy difference |h in1 -h out1 | and air mass flow rate q m Substitute the cooling capacity calculation formula of air conditioner 1 to determine the cooling capacity C of air conditioner 1 制冷量 , thereby determining the real-time capacity of the air conditioner 1 when it is in cooling mode. During the calculation process, only the change in the enthalpy difference between the indoor inlet and outlet air is used as a guide, and there is no need to consider other influencing factors such as the enthalpy value of the outdoor inlet and outlet air, thereby improving the accuracy of the capacity calculation of the air conditioner 1.

[0061] In some embodiments, when obtaining the first intake air humidity content or the first outlet air humidity content according to the first relative humidity, the controller 16 is configured to: obtain the first saturated water vapor pressure, the second saturated water vapor pressure and the standard atmospheric pressure; obtain the first intake air humidity content according to the first saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure; obtain the first outlet air humidity content according to the second saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure.

[0062] In the embodiment, the first inlet air temperature t is obtained. in1 and the first outlet air temperature t out1 Then, the first saturated water vapor pressure is determined according to the above-mentioned inlet and outlet air temperatures and saturated water vapor pressure calculation formula, for example, recorded as P b1 and the second saturated water vapor pressure, for example, is denoted as P b2 , where the saturated water vapor pressure calculation formula includes:

[0063] P b =6.11*10 ∧ (7.45t / (253+t))

[0064] Among them, P b is the saturated water vapor pressure, and t is the inlet temperature or outlet temperature.

[0065] That is, the first saturated water vapor pressure P b1 The calculation formula is as follows:

[0066] P b1 =6.11*10 ∧ (7.45t in1 / (253+t in1 ))

[0067] That is, the second saturated water vapor pressure P b2 The calculation formula is as follows:

[0068] P b2 =6.11*10∧ (7.45t out1 / (253+t out1 ))

[0069] At the same time, the standard atmospheric pressure is obtained, for example, recorded as P, the value of the standard atmospheric pressure P is 0.1013Mpa, and the first saturated water vapor pressure P is obtained. b1 , the second saturated water vapor pressure P b2 and standard atmospheric pressure P, according to the first saturated water vapor pressure P b1 , first relative humidity and standard atmospheric pressure P to obtain the first inlet air humidity, for example, denoted as d in1 , that is, the humidity content of the first inlet air d in1 The calculation formula is as follows:

[0070]

[0071] According to the second saturated water vapor pressure P b2 , first relative humidity and standard atmospheric pressure P to obtain the first outlet air humidity, for example, denoted as d out1 , that is, the humidity content of the first outlet air d out1 The calculation formula is as follows:

[0072]

[0073] In some embodiments, when the first enthalpy difference absolute value is determined based on the first inlet air humidity content, the first outlet air humidity content, the first inlet air temperature and the first outlet air temperature, the controller 16 is configured to: determine the first indoor inlet side air enthalpy value based on the first inlet air humidity content and the first inlet air temperature; determine the first indoor outlet side air enthalpy value based on the first outlet air humidity content and the first outlet air temperature; determine the first enthalpy difference absolute value based on the first indoor inlet side air enthalpy value, the first indoor outlet side air enthalpy value and the first enthalpy difference calculation formula.

[0074] In the embodiment, the first inlet air humidity d is obtained. in1 Then, according to the first inlet air humidity d in1 and the first inlet air temperature t in1 Combined with the constant pressure specific heat of dry air c pg and the constant pressure specific heat of water vapor c pq , determine the first indoor air inlet side air enthalpy value, for example, denoted as h in1 , that is, the air enthalpy value h on the first indoor air inlet side in1 The calculation formula is as follows:

[0075] h in1 =c pq *t in1 +(2500+cpq *t in1 )*d in1

[0076] Similarly, obtain the first outlet air humidity d out1 Then, according to the humidity content of the first outlet air d out1 and the first outlet air temperature t out1 Combined with the constant pressure specific heat of dry air c pg and the constant pressure specific heat of water vapor c pq , determine the air enthalpy value of the first indoor outlet side, for example, denoted as h out1 , that is, the air enthalpy value h at the first indoor outlet side out1 The calculation formula is as follows:

[0077] h out1 =c pg *t out1 +(2500+c pq *t out1 )*d out1

[0078] Determine the air enthalpy value h on the first indoor air inlet side in1 and the first indoor air outlet air enthalpy h out1 Then, the air enthalpy value h in1 and the first indoor air outlet air enthalpy h out1 Substitute the first enthalpy difference calculation formula to calculate the first indoor air inlet side enthalpy value h in1 and the first indoor air outlet side air enthalpy value h out1 The absolute value of the difference is taken to determine the absolute value of the first enthalpy difference, i.e. |h in1 -h out1 |, thus according to the absolute value of the first enthalpy difference |h in1 -h out1 |Determine the implementation capacity of the air conditioner 1 when it is in cooling mode.

[0079] In some embodiments, the first enthalpy difference calculation formula includes:

[0080] |h in1 -h out1 |=c pg *(t in1 -t out1 )+c pq *(t in1 *d in1 -t out1 *d out1 )+2500*(d in1 -d out1 )

[0081] Among them, |h in1 -hout1 | is the absolute value of the first enthalpy difference, h in is the air enthalpy value on the first indoor inlet side, h out is the air enthalpy value at the first indoor outlet side, t in1 is the first inlet air temperature, t out1 is the first outlet air temperature, d in1 is the humidity content of the first inlet air, d out1 is the humidity content of the first outlet air, c pg is the constant pressure specific heat of dry air, c pq is the constant pressure specific heat of water vapor.

[0082] In the embodiment, the first indoor air inlet side air enthalpy value h is determined in1 and the first indoor air outlet side air enthalpy value h out1 Then, the air enthalpy value h in1 and the first indoor air outlet side air enthalpy value h out1 Substitute into the first enthalpy difference calculation formula to determine the absolute value of the first enthalpy difference |h in1 -h out1 |, absolute value of the first enthalpy difference |h in1 -h 0ut1 The calculation formula of | is as follows:

[0083] |h in1 -h out1 |=c pg *(t in1 -t out1 )+c pq *(t in1 *d in1 -t out1 *d out1 )+2500*(d in1 -d out1 )

[0084] By determining the absolute value of the first enthalpy difference |h in1 -h out1 |, thus according to the absolute value of the first enthalpy difference |h in1 -h out1 |Determine the implementation capacity of the air conditioner 1 when it is in cooling mode.

[0085] In some embodiments, when the air conditioner 1 is in the heating mode, when the heating capacity of the air conditioner 1 is determined according to the second relative humidity, the second inlet air temperature, the second outlet air temperature, the air mass flow rate and the heating capacity calculation formula of the air conditioner 1, the controller 16 is configured to: obtain the second inlet air humidity content and the second outlet air humidity content according to the second relative humidity; determine the second enthalpy difference absolute value according to the second inlet air humidity content, the second outlet air humidity content, the second inlet air temperature and the second outlet air temperature; determine the cooling capacity of the air conditioner 1 according to the second enthalpy difference absolute value, the air mass flow rate and the cooling capacity calculation formula of the air conditioner 1.

[0086] In an embodiment, Figure 5 1 is a flow chart of a method for calculating the heating capacity of an air conditioner according to an embodiment of the present invention. When the operation mode of the air conditioner 1 is in the heating operation mode, the indoor heat exchanger 12 works as a condenser during heating to heat the air. When the temperature of the air increases, the relative humidity is calculated according to the second relative humidity. Get the second inlet air humidity, for example, record it as d in2 The humidity content of the second outlet air is denoted as d out2 , according to the second inlet air humidity d in2 , Second outlet air humidity d out2 , Second air inlet temperature t in2 and the second outlet air temperature t out2 Determine the absolute value of the second enthalpy difference, for example, denoted as |h in2 -h out2 |, the absolute value of the second enthalpy difference |h in2 -h out2 | and air mass flow rate q m Substitute the heating calculation formula of air conditioner 1 to determine the heating capacity C of air conditioner 1 制热量 , so as to determine the real-time capacity of the air conditioner 1 when it is in the heating mode. During the calculation process, only the enthalpy difference change of the indoor inlet and outlet air is used as a guide, and there is no need to consider other influencing factors such as the enthalpy value of the outdoor inlet and outlet air, thereby improving the accuracy of the capacity calculation of the air conditioner 1.

[0087] In some embodiments, when obtaining the second inlet air humidity content or the second outlet air humidity content according to the first relative humidity, the controller 16 is configured to: obtain the third saturated water vapor pressure, the fourth saturated water vapor pressure and the standard atmospheric pressure; obtain the second inlet air humidity content according to the third saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure; obtain the second outlet air humidity content according to the fourth saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure.

[0088] In the embodiment, the second inlet air temperature t is obtained. in2 and the second outlet air temperature t out2Then, the third saturated water vapor pressure is determined according to the above-mentioned inlet and outlet air temperatures and saturated water vapor pressure calculation formula, for example, recorded as P b3 and the fourth saturated water vapor pressure is denoted as P b4 , where the saturated water vapor pressure calculation formula includes:

[0089] P b =6.11*10 ∧ (7.45t / (253+t))

[0090] Among them, P b is the saturated water vapor pressure, and t is the inlet temperature or outlet temperature.

[0091] That is, the third saturated water vapor pressure P b3 The calculation formula is as follows:

[0092] P b3 =6.11*10 ∧ (7.45t in2 / (253+t in2 ))

[0093] That is, the fourth saturated water vapor pressure P b4 The calculation formula is as follows:

[0094] P b4 =6.11*10 ∧ (7.45t out2 / (253+t out2 ))

[0095] At the same time, the standard atmospheric pressure is obtained, for example, recorded as P, the value of the standard atmospheric pressure P is 0.1013Mpa, and the third saturated water vapor pressure P is obtained. b3 , Fourth saturated water vapor pressure P b4 and standard atmospheric pressure P, according to the third saturated water vapor pressure P b3 , Second relative humidity and standard atmospheric pressure P to obtain the second inlet air humidity, for example, denoted as d in2 , that is, the second inlet air humidity d in2 The calculation formula is as follows:

[0096]

[0097] According to the fourth saturated water vapor pressure P b4 , Second relative humidity and standard atmospheric pressure P to obtain the second outlet air humidity, for example, denoted as d out2 , that is, the humidity content of the second outlet air d out2 The calculation formula is as follows:

[0098]

[0099] In some embodiments, when the second enthalpy difference absolute value is determined based on the second inlet air humidity content, the second outlet air humidity content, the second inlet air temperature and the second outlet air temperature, the controller 16 is configured to: determine the second indoor inlet side air enthalpy value based on the second inlet air humidity content and the second inlet air temperature; determine the second indoor outlet side air enthalpy value based on the second outlet air humidity content and the second outlet air temperature; determine the second enthalpy difference absolute value based on the second indoor inlet side air enthalpy value, the second indoor outlet side air enthalpy value and the second enthalpy difference calculation formula.

[0100] In the embodiment, the second inlet air humidity d is obtained. in2 Then, according to the second inlet air humidity d in2 and the second inlet air temperature t in2 Combined with the constant pressure specific heat of dry air c pg and the constant pressure specific heat of water vapor c pq , determine the second indoor air inlet side air enthalpy value, for example, denoted as h in2 , that is, the air enthalpy value h on the second indoor air inlet side in2 The calculation formula is as follows:

[0101] h in2 =c pg *t in2 +(2500+c pg *t in2 )*d in2

[0102] Similarly, obtain the second outlet air humidity d out2 Then, according to the second outlet air humidity d out2 and the second outlet air temperature t out2 Combined with the constant pressure specific heat of dry air c pg and the constant pressure specific heat of water vapor c pq , determine the air enthalpy value at the second indoor outlet side, for example, denoted as h out2 , that is, the air enthalpy value h at the second indoor outlet side out2 The calculation formula is as follows:

[0103] h out2 =c pg *t out2 +(2500+c pq *t out2 )*d out2

[0104] Determine the air enthalpy value h on the second indoor air inlet side in2 and the air enthalpy value h at the second indoor outlet side out2 Then, the air enthalpy value h in2and the air enthalpy value h at the second indoor outlet side out2 Substitute the second enthalpy difference calculation formula to calculate the second indoor air inlet side enthalpy value h in2 and the air enthalpy value h at the second indoor outlet side out2 The absolute value of the second enthalpy difference is determined by taking the absolute value of the difference. in2 -h out2 |, thus according to the absolute value of the second enthalpy difference |h in2 -h out2 |Determine the real-time capability of air conditioner 1 when it is in heating mode.

[0105] In some embodiments, the second enthalpy difference calculation formula includes:

[0106] |h in2 -h out2 |=c pg *(t out2 -t in2 )+c pq *d*(t out2 -t in2 )

[0107] Among them, |h in2 -h out2 | is the absolute value of the second enthalpy difference, h in2 is the air enthalpy value on the second indoor air inlet side, h out2 is the humidity content of the second outlet air, t out2 is the second outlet air temperature, t in2 is the second inlet air temperature, c pg is the constant pressure specific heat of dry air, c pq is the constant pressure specific heat of water vapor, and d is the humidity content of air.

[0108] In the embodiment, the second indoor air inlet side air enthalpy value h is determined in2 and the air enthalpy value h at the second indoor outlet side out2 Then, the air enthalpy value h in2 and the air enthalpy value h at the second indoor outlet side out2 Substitute into the second enthalpy difference calculation formula to determine the absolute value of the second enthalpy difference |h in2 -h out2 |, absolute value of the second enthalpy difference |h in2 -h out2 The calculation formula of | is as follows:

[0109] |h in2 -h out2 |=c pg *(t out2 -t in2 )+c pq *d*(t out2 -tin2 )

[0110] Among them, the air humidity d in winter environment is about 5‰ to 15‰, so the above formula can be simplified to:

[0111] |h in2 -h out2 |=c pg *(t out2 -t in2 )+C

[0112] Wherein, C is a constant, whose value is between 0 and 1, and is preset in the controller 16 as a preset value. The absolute value of the second enthalpy difference in the heating mode |h in2 -h out2 |Only based on the second inlet air temperature t obtained in real time by the indoor temperature sensor 13 in2 , and the second outlet air temperature t obtained in real time by the coil temperature sensor 14 out2 Calculations show that the data collection of inlet and outlet air temperatures is relatively simple, and the calculation process of air humidity content is omitted, thereby simplifying the calculation method of the heating mode.

[0113] By determining the absolute value of the second enthalpy difference |h in2 -h out2 |, thus according to the absolute value of the second enthalpy difference |h in2 -h out2 |Determine the real-time capability of air conditioner 1 when it is in heating mode.

[0114] In some embodiments, the cooling capacity calculation formula includes:

[0115] C 制冷量 =|h in1 -h out1 |*q m *α*10 3

[0116] Among them, |h in1 -h out1 | is the absolute value of the first enthalpy difference, q m is the air mass flow rate, α is the capacity correction factor;

[0117] In an embodiment, the first enthalpy difference absolute value |h is determined in1 -h out1 |After that, the absolute value of the first enthalpy difference |h in1 -h out1 | And combined with the air mass flow q m , the capacity correction coefficient α is substituted into the cooling capacity calculation formula of air conditioner 1 to determine the cooling capacity C of air conditioner 1 制冷量, thereby determining the real-time capacity of the air conditioner 1 when it is in cooling mode, the cooling capacity C of the air conditioner 1 制冷量 The calculation formula is as follows:

[0118] C 制冷量 =|h in1 -h out1 |*q m *α*10 3

[0119] It can be understood that the capacity correction coefficient α can be divided into three levels according to the indoor ambient temperature. When the operating mode of the air conditioner 1 is in the cooling operation mode, the ambient temperature range can be divided into 10-20℃ (low load), 20-30℃ (medium load) and above 30 (high load), and three different capacity correction coefficients are set accordingly.

[0120] By calculating the cooling capacity C of air conditioner 1 制冷量 , determine the real-time capacity of the air conditioner 1 when it is in cooling mode.

[0121] In some embodiments, the heating amount calculation formula includes:

[0122] C 制热量 =|h in2 -h out2 |*q m *α*10 3

[0123] Among them, |h in2 -h out2 | is the absolute value of the second enthalpy difference, q m is the air mass flow rate, and α is the capacity correction factor.

[0124] In an embodiment, the second enthalpy difference absolute value |h is determined in2 -h out2 |, the absolute value of the second enthalpy difference |h in2 -h out2 | And combined with the air mass flow q m , the capacity correction coefficient α is brought into the heating calculation formula of air conditioner 1 to determine the heating capacity C of air conditioner 1 制热量 , thereby determining the real-time capacity of the air conditioner 1 when it is in the heating mode, the heating capacity of the air conditioner 1 C 制热量 The calculation formula is as follows:

[0125] C 制热量 =|h in2 -h out2 |*q m *α*10 3

[0126] It can be understood that the capacity correction coefficient α can be divided into three levels according to the indoor ambient temperature. When the operating mode of the air conditioner 1 is in the heating operation mode, the ambient temperature range can be divided into less than 15°C (high load), 15-25°C (medium load), and above 25°C (low load), and three different capacity correction coefficients are set accordingly.

[0127] By calculating the heating capacity C of air conditioner 1 制热量 , determine the real-time capacity of the air conditioner 1 when it is in heating mode.

[0128] By calculating the cooling capacity C of air conditioner 1 制冷量 and heating capacity C 制热量 , thereby determining the real-time capability of the air conditioner 1 under different operating modes.

[0129] 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.

[0130] 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 S27.

[0131] Step S11, the air conditioner is turned on and operated.

[0132] Step S12, obtaining the operation mode, the first air inlet temperature, the first air outlet temperature, the second air inlet temperature, the second air outlet temperature, the first relative humidity, the second relative humidity and the air mass flow of the air conditioner.

[0133] Step S13, determining whether the air conditioner is in cooling operation mode, if so, executing step S14; otherwise, executing step S23.

[0134] Step S14, obtaining the first saturated water vapor pressure, the second saturated water vapor pressure and the standard atmospheric pressure.

[0135] Step S15, obtaining the first inlet air moisture content according to the first saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure.

[0136] Step S16, obtaining the first outlet air moisture content according to the second saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure.

[0137] Step S17, determining the first indoor inlet air enthalpy value according to the first inlet air humidity content and the first inlet air temperature.

[0138] Step S18, determining the first indoor air outlet side air enthalpy value according to the first outlet air humidity content and the first outlet air temperature.

[0139] Step S19: determining a first enthalpy difference absolute value according to the first indoor air inlet side enthalpy value, the first indoor air outlet side enthalpy value and a first enthalpy difference calculation formula.

[0140] Step S20, determining the cooling capacity of the air conditioner according to the absolute value of the first enthalpy difference, the air mass flow rate and the air conditioner cooling capacity calculation formula.

[0141] Step S21, obtaining a third saturated water vapor pressure, a fourth saturated water vapor pressure and a standard atmospheric pressure.

[0142] Step S22, obtaining the second inlet air moisture content according to the third saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure.

[0143] Step S23, obtaining the second outlet air moisture content according to the fourth saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure.

[0144] Step S24, determining the second indoor inlet air enthalpy value according to the second inlet air humidity content and the second inlet air temperature.

[0145] Step S25, determining the second indoor air outlet side air enthalpy value according to the second outlet air humidity content and the second outlet air temperature.

[0146] Step S26, determining the second enthalpy difference absolute value according to the second indoor air inlet side enthalpy value, the second indoor air outlet side enthalpy value and the second enthalpy difference calculation formula.

[0147] Step S27, determining the heating capacity of the air conditioner according to the absolute value of the second enthalpy difference, the air mass flow rate and the air conditioner heating capacity calculation formula.

[0148] According to the air conditioner 1 of the embodiment of the present invention, since the air conditioner 1 has a device for detecting the inlet and outlet air temperatures and humidity, after being turned on, the first inlet air temperature, the first outlet air temperature, the second inlet air temperature, the second outlet air temperature, the first relative humidity and the second relative humidity of the indoor heat exchanger 12 are obtained by using the existing device, and the real-time capacity of the air conditioner 1 under different operating modes is calculated in combination with the operating mode and air mass flow of the air conditioner 1. The inlet and outlet air temperatures and humidity are detected by using the existing device, and there is no need to detect the outdoor inlet and outlet air enthalpy values, 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.

[0149] 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.

[0150] 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: 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 indoor heat exchanger, which works as an evaporator during cooling and as a condenser during heating; Indoor temperature sensor, used to detect the indoor air intake temperature; A coil temperature sensor, used to detect the outlet air temperature of the indoor heat exchanger; Indoor humidity sensor, used to detect the relative humidity indoors; The controller is configured to: obtain the operation mode, the first air inlet temperature, the first air outlet temperature, the second air inlet temperature, the second air outlet temperature, the first relative humidity, the second relative humidity and the air mass flow of the air conditioner; When the air conditioner is in cooling mode, the cooling capacity of the air conditioner is determined according to the first relative humidity, the first air inlet temperature, the first air outlet temperature, the air mass flow rate and a cooling capacity calculation formula of the air conditioner; When the air conditioner is in heating mode, the heating amount of the air conditioner is determined according to the second relative humidity, the second air inlet temperature, the second air outlet temperature, the air mass flow rate and a heating amount calculation formula of the air conditioner.

2. The air conditioner according to claim 1, characterized in that: When the air conditioner is in cooling mode, when determining the cooling capacity of the air conditioner according to the first relative humidity, the first air inlet temperature, the first air outlet temperature, the air mass flow rate and the air conditioner cooling capacity calculation formula, the controller is configured as follows: Acquire a first inlet air humidity content and a first outlet air humidity content according to the first relative humidity; determining a first enthalpy difference absolute value according to the first inlet air humidity content, the first outlet air humidity content, the first inlet air temperature, and the first outlet air temperature; The cooling capacity of the air conditioner is determined according to the first enthalpy difference absolute value, the air mass flow rate and a cooling capacity calculation formula of the air conditioner.

3. The air conditioner according to claim 2, characterized in that: When obtaining the first inlet air humidity content or the first outlet air humidity content according to the first relative humidity, the controller is configured as follows: Obtaining a first saturated water vapor pressure, a second saturated water vapor pressure, and a standard atmospheric pressure; Obtaining the first inlet air moisture content according to the first saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure; The first outlet air humidity content is obtained according to the second saturated water vapor pressure, the first relative humidity and the standard atmospheric pressure.

4. The air conditioner according to claim 2, characterized in that: When determining the first enthalpy difference absolute value according to the first inlet air humidity content, the first outlet air humidity content, the first inlet air temperature and the first outlet air temperature, the controller is configured as follows: Determine the first indoor air inlet side air enthalpy value according to the first inlet air humidity content and the first inlet air temperature; Determine the first indoor air outlet side air enthalpy value according to the first outlet air humidity content and the first outlet air temperature; The first enthalpy difference absolute value is determined according to the first indoor air inlet side enthalpy value, the first indoor air outlet side enthalpy value and a first enthalpy difference calculation formula.

5. The air conditioner according to claim 4, characterized in that: The first enthalpy difference calculation formula includes: |h in1 -h out1 |=c pg *(t in1 -t out1 )+c pq *(t in1 *d in1 -t out1 *d out1 )+2500*(d in1 -d out1 ) where |h in1 -h out1 | is the absolute value of the first enthalpy difference, h in is the air enthalpy value on the first indoor air inlet side, h out is the air enthalpy value at the first indoor outlet side, t in1 is the first inlet air temperature, t out1 is the first outlet air temperature, d in1 is the first inlet air humidity, d out1 is the humidity content of the first outlet air, c pg is the constant pressure specific heat of dry air, c pq is the constant pressure specific heat of water vapor.

6. The air conditioner according to claim 1, characterized in that: When the air conditioner is in heating mode, when the heating capacity of the air conditioner is determined according to the second relative humidity, the second air inlet temperature, the second air outlet temperature, the air mass flow rate and the air conditioner heating capacity calculation formula, the controller is configured as follows: Acquire a second inlet air humidity content and a second outlet air humidity content according to the second relative humidity; determining a second enthalpy difference absolute value according to the second inlet air humidity content, the second outlet air humidity content, the second inlet air temperature, and the second outlet air temperature; The cooling capacity of the air conditioner is determined according to the second enthalpy difference absolute value, the air mass flow rate and the air conditioner cooling capacity calculation formula.

7. The air conditioner according to claim 6, characterized in that: When obtaining the second inlet air humidity content or the second outlet air humidity content according to the first relative humidity, the controller is configured as follows: Obtaining a third saturated water vapor pressure, a fourth saturated water vapor pressure, and a standard atmospheric pressure; Obtaining the second inlet air moisture content according to the third saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure; The second outlet air humidity content is obtained according to the fourth saturated water vapor pressure, the second relative humidity and the standard atmospheric pressure.

8. The air conditioner according to claim 6, characterized in that: When determining the second enthalpy difference absolute value according to the second inlet air humidity content, the second outlet air humidity content, the second inlet air temperature and the second outlet air temperature, the controller is configured as follows: Determine the second indoor air inlet side air enthalpy value according to the second air inlet humidity and the second air inlet temperature; Determine the second indoor air outlet side air enthalpy value according to the second air outlet air humidity content and the second air outlet temperature; The second enthalpy difference absolute value is determined according to the second indoor air inlet side enthalpy value, the second indoor air outlet side enthalpy value and a second enthalpy difference calculation formula.

9. The air conditioner according to claim 8, characterized in that: The second enthalpy difference calculation formula includes: |h in2 -h out2 |=c pg *(t out2 -t in2 )+c pq *d*(t out2 -t in2 ) Among them, |h in2 -h out2 | is the absolute value of the second enthalpy difference, h in2 is the air enthalpy value on the inlet side of the second room, h out2 is the second outlet air humidity content, t out2 is the second outlet air temperature, t in2 is the second inlet air temperature, c pg is the constant pressure specific heat of dry air, c pq is the constant-pressure specific heat of water vapor, and d is the moisture content of the air.

10. The air conditioner according to claim 1, characterized in that: The cooling capacity calculation formula include: C 制冷量 =|h in1 -h out1 |*q m *α*10 3 Among them, |h in1 -h out1 | is the absolute value of the first enthalpy difference, the q m is the air mass flow rate, and α is the capacity correction coefficient; The heating calculation formula includes: C 制热量 =|h in2 -h out2 |*q m *α*10 3 Among them, |h in2 -h out2 | is the absolute value of the second enthalpy difference, the q m is the air mass flow rate, and α is the capacity correction coefficient.

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