Air conditioner and capacity detection method thereof

Abstract

The invention discloses an air conditioner and a capacity detection method thereof. The capacity detection method comprises the steps that the power of a compressor, the outdoor unit heat exchanger inlet temperature detected by a first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by a second temperature sensor and gas information detected by a gas information detection device are obtained; based on the outdoor unit heat exchanger inlet temperature and the outdoor unit heat exchanger outlet temperature, an inlet and outlet enthalpy difference value is calculated; based on the gas information, the gas flow in the outdoor unit is calculated; and according to the inlet and outlet enthalpy difference value, the gas flow and the compressor power, the refrigerating capacity / heating capacity of the air conditioner is detected. According to the embodiment of the invention, the capacity of the air conditioner does not need to be detected in an enthalpy difference laboratory, and the actual operation capacity of the air conditioner can be detected only by means of the information detected by the first temperature sensor, the second temperature sensor and the gas information detection device.

Description

Technical Field

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

[0002] With the development of the economy and society, air conditioners offer a better user experience, making them increasingly popular in various settings, including entertainment, home, and work. If air conditioner performance could be measured (for example, cooling capacity during cooling mode or heating capacity during heating mode), overshoot or underperformance of the indoor unit could be reduced, leading to better cooling or heating results. However, methods for measuring the performance of air conditioners during actual operation are currently lacking. Summary of the Invention

[0003] The present invention provides an air conditioner and a method for detecting the performance of the air conditioner, so as to solve the problem in the prior art of lacking the ability to detect the actual operation of the air conditioner.

[0004] To achieve the above object, an embodiment of the present invention provides an air conditioner, comprising:

[0005] Indoor unit, which houses the indoor heat exchanger and indoor fan;

[0006] An outdoor unit is provided with an outdoor heat exchanger, an outdoor fan, a compressor, a flow regulating valve and a four-way valve, wherein the compressor, the flow regulating valve, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are connected by pipelines to form a refrigerant circulation loop;

[0007] The first temperature sensor is provided at the inlet of the outdoor unit heat exchanger and is used to detect the inlet temperature of the outdoor unit heat exchanger;

[0008] The second temperature sensor is provided at the outlet of the outdoor unit heat exchanger and is used to detect the outlet temperature of the outdoor unit heat exchanger;

[0009] a gas information detection device, provided at the air inlet and / or the air outlet of the outdoor unit, for detecting gas information in the outdoor unit; the gas information includes at least one of gas pressure, gas wind speed, and a pressure difference between the air inlet and the air outlet of the outdoor unit, the gas pressure including the air inlet pressure and the air outlet pressure of the outdoor unit;

[0010] The controller is used to:

[0011] Acquire the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device;

[0012] Calculating an inlet and outlet enthalpy difference based on the inlet temperature and outlet temperature of the outdoor heat exchanger;

[0013] Calculating the gas flow rate in the outdoor unit based on the gas information;

[0014] The cooling capacity / heating capacity of the air conditioner is detected according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power.

[0015] As an improvement to the above solution, the calculation of the inlet and outlet enthalpy difference based on the inlet temperature and the outlet temperature of the outdoor heat exchanger includes:

[0016] Calculating a temperature difference characteristic according to the outdoor unit heat exchanger inlet temperature and the outdoor unit heat exchanger outlet temperature; wherein the temperature difference characteristic is an absolute value of the temperature difference or an average absolute value of the temperature difference;

[0017] The temperature difference characteristic is multiplied by the preset constant pressure specific heat to obtain the inlet and outlet enthalpy difference.

[0018] As an improvement to the above solution, if the gas information detection device includes a first pressure sensor and a second pressure sensor, then

[0019] The first pressure sensor is provided at the air inlet of the outdoor unit and is used to detect the air inlet pressure of the outdoor unit;

[0020] The second pressure sensor is provided at the air outlet of the outdoor unit and is used to detect the pressure at the air outlet of the outdoor unit;

[0021] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0022] Acquire the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor;

[0023] Calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure;

[0024] The gas flow rate in the outdoor unit is obtained according to the difference and a preset resistance along the air-conditioning pipeline.

[0025] As an improvement to the above solution, if the gas information detection device includes a differential pressure device, one end of the device is connected to the inlet of the outdoor unit heat exchanger, and the other end is connected to the outlet of the outdoor unit heat exchanger, for detecting the pressure difference between the inlet of the outdoor unit heat exchanger and the outlet of the outdoor unit heat exchanger;

[0026] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0027] obtaining the pressure difference detected by the differential pressure device;

[0028] The gas flow rate in the outdoor unit is obtained according to a preset differential pressure device constant, a preset gas density and the pressure difference.

[0029] As an improvement to the above solution, if the gas information detection device includes a wind speed sensor, it is provided at the air inlet of the outdoor heat exchanger to detect the wind speed at the air inlet of the outdoor heat exchanger;

[0030] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0031] Obtaining the wind speed detected by the wind speed sensor;

[0032] The preset mass flow correction coefficient is multiplied by the wind speed to obtain the gas flow in the outdoor unit.

[0033] As an improvement to the above solution, the detecting of the cooling capacity / heating capacity of the air conditioner according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power includes:

[0034] Calculating the product of the inlet and outlet enthalpy difference and the gas flow rate;

[0035] Subtracting the compressor power from the multiplication result to obtain the cooling capacity of the air conditioner;

[0036] Alternatively, the multiplication result is added to the compressor power to obtain the heating capacity of the air conditioner.

[0037] In addition, an embodiment of the present invention further provides a capacity detection method for an air conditioner, wherein the air conditioner at least comprises: an indoor unit, wherein an indoor heat exchanger and an indoor fan are provided therein; an outdoor unit, wherein an outdoor heat exchanger, an outdoor fan, a compressor, a flow regulating valve and a four-way valve are provided therein, wherein the compressor, the flow regulating valve, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are connected by pipelines to form a refrigerant circulation loop; a first temperature sensor is provided at an inlet of the outdoor heat exchanger, for detecting an inlet temperature of the outdoor heat exchanger; a second temperature sensor is provided at an outlet of the outdoor heat exchanger, for detecting an outlet temperature of the outdoor heat exchanger; a gas information detection device is provided at an air inlet and / or an air outlet of the outdoor unit, for detecting gas information in the outdoor unit; the gas information comprises at least one of gas pressure, gas wind speed and a pressure difference between the air inlet of the outdoor unit and the air outlet of the outdoor unit, and the gas pressure comprises an outdoor air inlet pressure and an outdoor air outlet pressure;

[0038] The capacity detection method of the air conditioner comprises:

[0039] Acquire the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device;

[0040] Calculating an inlet and outlet enthalpy difference based on the inlet temperature and outlet temperature of the outdoor heat exchanger;

[0041] Calculating the gas flow rate in the outdoor unit based on the gas information;

[0042] The cooling capacity / heating capacity of the air conditioner is detected according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power.

[0043] As an improvement to the above solution, if the gas information detection device includes a first pressure sensor and a second pressure sensor, then

[0044] The first pressure sensor is provided at the air inlet of the outdoor unit and is used to detect the air inlet pressure of the outdoor unit;

[0045] The second pressure sensor is provided at the air outlet of the outdoor unit and is used to detect the pressure at the air outlet of the outdoor unit;

[0046] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0047] Acquire the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor;

[0048] Calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure;

[0049] The gas flow rate in the outdoor unit is obtained according to the difference and a preset resistance along the air-conditioning pipeline.

[0050] As an improvement to the above solution, if the gas information detection device includes a differential pressure device, one end of the device is connected to the inlet of the outdoor unit heat exchanger, and the other end is connected to the outlet of the outdoor unit heat exchanger, for detecting the pressure difference between the inlet of the outdoor unit heat exchanger and the outlet of the outdoor unit heat exchanger;

[0051] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0052] obtaining the pressure difference detected by the differential pressure device;

[0053] The gas flow rate in the outdoor unit is obtained according to a preset differential pressure device constant, a preset gas density and the pressure difference.

[0054] As an improvement to the above solution, if the gas information detection device includes a wind speed sensor, it is provided at the air inlet of the outdoor heat exchanger to detect the wind speed at the air inlet of the outdoor heat exchanger;

[0055] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0056] Obtaining the wind speed detected by the wind speed sensor;

[0057] The preset mass flow correction coefficient is multiplied by the wind speed to obtain the gas flow in the outdoor unit.

[0058] Compared with the prior art, the embodiment of the present invention provides an air conditioner and its capacity detection method, which obtains the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device; calculates the inlet and outlet enthalpy difference based on the outdoor unit heat exchanger inlet temperature and the outdoor unit heat exchanger outlet temperature; calculates the gas flow in the outdoor unit based on the gas information; and detects the air conditioner cooling capacity / air conditioner heating capacity based on the inlet and outlet enthalpy difference, the gas flow, and the compressor power. It can be seen that the embodiment of the present invention does not need to detect the air conditioner capacity in an enthalpy difference laboratory, but only needs to use the information detected by the first temperature sensor, the second temperature sensor, and the gas information detection device to detect the capacity of the air conditioner during actual operation. Its data collection is simple, and there are fewer other influencing factors in the detection process, and the detection results are relatively accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a perspective view of the appearance of an air conditioner provided by one embodiment of the present invention;

[0060] Figure 2 This is a structural diagram of an air conditioner provided by one embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of a refrigerant circulation circuit of an air conditioner provided by one embodiment of the present invention;

[0062] Figure 4 This is a circuit diagram of an air conditioner provided by an embodiment of the present invention;

[0063] Figure 5 This is a first working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention;

[0064] Figure 6 This is a second working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention;

[0065] Figure 7 This is a third working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention;

[0066] Figure 8 This is a fourth working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention;

[0067] Figure 9 is a fifth working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention;

[0068] Figure 10 The present invention provides a flowchart of a method for detecting the performance of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0070] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0071] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0072] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0073] See also Figures 1 to 2, Figure 1 This is a perspective view of the appearance of an air conditioner provided by one embodiment of the present invention. Figure 2 FIG1 is a schematic diagram of the structure of an air conditioner provided in one embodiment of the present invention. The air conditioner 1 provided in the embodiment of the present invention comprises:

[0074] Indoor unit 2, which is equipped with an indoor heat exchanger 21 and an indoor fan 22;

[0075] The outdoor unit 3 includes an outdoor heat exchanger 31, an outdoor fan 32, a compressor 33, a flow regulating valve 34, and a four-way valve 35. The compressor 33, the flow regulating valve 34, the four-way valve 35, the outdoor heat exchanger 31, and the indoor heat exchanger 21 are connected by pipelines to form a refrigerant circulation loop.

[0076] Specifically, the indoor unit heat exchanger 21 is used to act as an evaporator or a condenser according to the operating state of the indoor unit, so that the refrigerant flowing in the heat transfer tube and the air passing through the indoor unit heat exchanger can perform heat exchange;

[0077] The outdoor unit heat exchanger 31 is used to act as a condenser or an evaporator according to the operating state of the outdoor unit, so that the refrigerant flowing in the heat transfer tube and the air passing through the outdoor unit heat exchanger can exchange heat;

[0078] The compressor 33 is used to compress the refrigerant into a high-temperature and high-pressure gas;

[0079] The flow regulating valve 34 is used to convert the medium-temperature and high-pressure liquid after the outdoor unit heat exchanger absorbs cold and releases heat into a low-temperature and low-pressure liquid;

[0080] The four-way valve 35 is used to switch between cooling and heating by changing the flow direction of the refrigerant in the circulation loop;

[0081] For example, the air conditioner 1 in the embodiment of the present invention includes an indoor unit 2. Taking the indoor wall mounted unit (shown in the figure) as an example, the indoor wall mounted unit is usually installed on the indoor wall. For another example, the indoor cabinet unit (not shown in the figure) is also a form of indoor unit. The outdoor unit 3 is usually set outdoors and used for heat exchange in the indoor environment. In addition, Figure 1In the figure, the outdoor unit 3 is shown with a dashed line because it is located outdoors on the opposite side of the indoor unit 2, separated by a wall. The indoor unit 2 and the outdoor unit 3 are connected by a connecting pipe 4. The indoor unit 2 houses an indoor heat exchanger 21 and an indoor fan 22. When the air conditioner is in cooling mode, the indoor heat exchanger 21 operates as an evaporator. Depending on the operating state of the indoor unit, the indoor heat exchanger 21 functions as an evaporator or a radiator, exchanging heat between the refrigerant flowing through the heat transfer tubes and the air passing through the indoor heat exchanger. The indoor fan 22 generates an airflow of indoor air through the indoor heat exchanger 21 to promote heat exchange between the refrigerant flowing through the heat transfer tubes of the indoor heat exchanger 21 and the indoor air. The outdoor unit 3 houses an outdoor heat exchanger 31, an outdoor fan 32, a compressor 33, a flow control valve 34, and a four-way valve 35. When the air conditioner is in cooling mode, the outdoor heat exchanger 31 operates as a condenser. The outdoor fan 32 generates an airflow of outdoor air through the outdoor heat exchanger 31 to promote heat exchange between the refrigerant flowing in the heat transfer tube of the outdoor heat exchanger 31 and the outdoor air.

[0082] See also Figure 3 , Figure 3 The figure is a schematic diagram of a refrigerant circulation circuit for an air conditioner provided by one embodiment of the present invention. A compressor 33, a flow control valve 34, a four-way valve 35, an outdoor heat exchanger 31, and an indoor heat exchanger 21 are connected by pipes to form a refrigerant circulation circuit. When the air conditioner is in cooling mode, the indoor heat exchanger 21 and the outdoor heat exchanger 31 function as an evaporator and a condenser, respectively. The refrigerant is compressed by the compressor and converted into a high-temperature, high-pressure gas. It then passes through the four-way valve and enters the outdoor heat exchanger of the outdoor unit. After absorbing cold and releasing heat in the outdoor heat exchanger, it becomes a medium-temperature, high-pressure liquid. After passing through the flow control valve, it becomes a low-temperature, low-pressure liquid. After absorbing heat and releasing cold in the indoor heat exchanger of the indoor unit, it becomes a low-temperature, low-pressure gas. It then passes through the four-way valve and returns to the compressor, where it continues its cycle. By circulating the refrigerant in the refrigerant circuit, a vapor compression refrigeration cycle can be performed. The flow control valve can change its opening degree. Reducing the opening degree increases the flow resistance of the refrigerant through the flow control valve, while increasing the opening degree decreases the flow resistance. During cooling operation, this flow control valve expands and decompresses the refrigerant flowing from the indoor heat exchanger to the outdoor heat exchanger. Furthermore, even if the conditions of other components in the refrigerant circuit remain unchanged, changes in the opening degree of the flow control valve will also change the flow rate of the refrigerant flowing through the refrigerant circuit.

[0083] In addition, if Figure 4The air conditioner 1 provided in the embodiment of the present invention further includes: a first temperature sensor, a second temperature sensor, a gas information detection device and a controller. The first temperature sensor, the second temperature sensor and the gas information detection device are respectively connected to the controller for interaction.

[0084] The first temperature sensor is provided at the inlet of the outdoor unit heat exchanger and is used to detect the inlet temperature of the outdoor unit heat exchanger;

[0085] The second temperature sensor is provided at the outlet of the outdoor unit heat exchanger and is used to detect the outlet temperature of the outdoor unit heat exchanger;

[0086] a gas information detection device, provided at the air inlet and / or the air outlet of the outdoor unit, for detecting gas information in the outdoor unit; the gas information includes at least one of gas pressure, gas wind speed, and a pressure difference between the air inlet and the air outlet of the outdoor unit, the gas pressure including the air inlet pressure and the air outlet pressure of the outdoor unit;

[0087] The controller is used to:

[0088] Acquire the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device;

[0089] Calculating an inlet and outlet enthalpy difference based on the inlet temperature and outlet temperature of the outdoor heat exchanger;

[0090] Calculating the gas flow rate in the outdoor unit based on the gas information;

[0091] The cooling capacity / heating capacity of the air conditioner is detected according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power.

[0092] In an embodiment of the present invention, a first temperature sensor is provided to detect the inlet temperature of the outdoor heat exchanger, and a second temperature sensor is provided to detect the outlet temperature of the outdoor heat exchanger, and the inlet and outlet enthalpy difference is calculated;

[0093] A gas information detection device is provided at the air inlet and / or the air outlet of the outdoor unit to detect the gas information in the outdoor unit and calculate the gas flow in the outdoor unit;

[0094] Currently, gas flow can be calculated using a variety of methods. However, for one-to-one air conditioner systems, cost constraints limit the applicability of capacity calculations. Therefore, embodiments of the present invention utilize two pressure sensors and / or differential pressure devices and / or wind speed sensors to obtain gas flow, broadening its applicability. Of course, embodiments of the present invention can calculate gas flow using only one of these methods, or they can calculate gas flow using both methods, then calculate an average value, which can then be used to test the air conditioner's capacity.

[0095] In addition, the compressor power is also obtained. For example, the corresponding compressor power can be obtained from the preset gear and power mapping relationship based on the current gear of the air conditioner (selected by the user). Of course, there are other ways to obtain it, which are not limited here.

[0096] Finally, the air conditioner cooling capacity / air conditioner heating capacity is detected through the inlet and outlet enthalpy difference, gas flow and compressor power. After detecting the air conditioner cooling capacity / air conditioner heating capacity, a corresponding control signal is generated according to the air conditioner cooling capacity / air conditioner heating capacity, so as to use the control signal to control the operating status of the compressor and / or flow regulating valve. Of course, the air conditioner cooling capacity / air conditioner heating capacity can also be sent to the display module of the air conditioner for display, so that the user can intuitively view the air conditioner cooling capacity / air conditioner heating capacity.

[0097] The embodiment of the present invention does not need to detect the capacity of the air conditioner in an enthalpy difference laboratory. It only needs to use the information detected by the first temperature sensor, the second temperature sensor and the gas information detection device to detect the capacity of the air conditioner during actual operation. The data collection is simple, and there are fewer other influencing factors in the detection process, so the detection results are more accurate.

[0098] For example, Figure 5 , Figure 5 This is a first working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention, including steps S11-S15;

[0099] S11, obtaining the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device, and proceeding to step S12;

[0100] S12, calculating the inlet and outlet enthalpy difference based on the outdoor heat exchanger inlet temperature and the outdoor heat exchanger outlet temperature, and proceeding to step S13;

[0101] S13. Calculate the gas flow rate in the outdoor unit based on the gas information, and proceed to step S14 or step S15;

[0102] S14. In the cooling mode of the air conditioner, the cooling capacity of the air conditioner is detected based on the inlet and outlet enthalpy difference, the gas flow rate, and the compressor power;

[0103] S15. In the heating mode of the air conditioner, the heating capacity of the air conditioner is detected according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power.

[0104] In an optional embodiment, detecting the cooling capacity / heating capacity of the air conditioner according to the inlet and outlet enthalpy difference, the gas flow rate, and the compressor power includes:

[0105] Calculating the product of the inlet and outlet enthalpy difference and the gas flow rate;

[0106] Subtracting the compressor power from the multiplication result to obtain the cooling capacity of the air conditioner;

[0107] Alternatively, the multiplication result is added to the compressor power to obtain the heating capacity of the air conditioner.

[0108] For example, the air conditioner cooling capacity / air conditioner heating capacity is calculated according to the following formula:

[0109] Qc=|hin-hout|×qm-W

[0110] Qh=|hin-hout|×qm+W

[0111] Where: Qc is the cooling capacity of the indoor unit, (unit, W); Qh is the heating capacity of the indoor unit, (unit, W); hin is the inlet enthalpy of the outdoor unit heat exchanger, (unit, J / kg); hout is the outlet enthalpy of the outdoor unit heat exchanger, (unit, J / kg); qm is the gas flow rate, (unit, kg / s); W is the compressor power, (unit, W).

[0112] For example, Figure 6 , Figure 6 This is a second working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention, including steps S21-S23;

[0113] S21, determine the current operating mode of the air conditioner. If the operating mode is cooling mode, proceed to step S22; if the operating mode is heating mode, proceed to step S23;

[0114] S22. Calculate the product of the inlet and outlet enthalpy difference and the gas flow rate, and subtract the compressor power from the product to obtain the cooling capacity of the air conditioner;

[0115] S23. Calculate the product of the inlet and outlet enthalpy difference and the gas flow rate, add the multiplication result to the compressor power, and obtain the heating capacity of the air conditioner.

[0116] In an optional embodiment, the calculating the inlet and outlet enthalpy difference based on the inlet temperature and the outlet temperature of the outdoor heat exchanger includes:

[0117] Calculating a temperature difference characteristic according to the outdoor unit heat exchanger inlet temperature and the outdoor unit heat exchanger outlet temperature; wherein the temperature difference characteristic is an absolute value of the temperature difference or an average absolute value of the temperature difference;

[0118] The temperature difference characteristic is multiplied by the preset constant pressure specific heat to obtain the inlet and outlet enthalpy difference.

[0119] It is worth noting that enthalpy is a thermodynamic property that describes the thermodynamic properties of a substance at a certain temperature and pressure. It can be described by the temperature, pressure, and state variables of a substance. There is a close relationship between enthalpy and temperature, and the relationship between them can be expressed by thermodynamic equations. According to the first law of thermodynamics, the enthalpy of a substance can be expressed in terms of temperature. When the temperature increases, the enthalpy of the substance also increases, and vice versa. The change in the value is proportional to the change in temperature, that is:

[0120] Δh=|hin-hout|=c p |Δt|

[0121] Where Δh is the difference between inlet and outlet enthalpy (unit: J / kg); c p is the specific heat at constant pressure (unit, J / kg·K); Δt is the temperature difference characteristic (unit, K).

[0122] The temperature difference feature is the absolute value of the temperature difference, or the absolute value of the average temperature difference, so there are two calculation methods:

[0123] The calculation formula for the absolute value of temperature difference is:

[0124] |Δt|=|t in -t out |

[0125] Among them, t in is the inlet temperature of the outdoor unit heat exchanger (unit: K); t out is the outlet temperature of the outdoor unit heat exchanger (unit: K).

[0126] The calculation formula of the absolute value of the average temperature difference;

[0127] To simplify the calculation of the average temperature difference in complex arrangements, the average temperature difference is taken as the logarithmic average temperature difference and a correction factor is applied to simplify it, as follows:

[0128] |Δt|=ψ(Δt m ) ctf

[0129] Among them, (Δt m ) ctf It is the logarithmic mean temperature difference when the inlet and outlet temperatures of the given cold and hot fluids are arranged in countercurrent flow; ψ is the preset correction coefficient, which is filled in as a preset value according to the layout of the heat exchanger, and ψ<1.

[0130]

[0131] Where Δt max Represents the temperature difference between the hot and cold fluids on the same side of the outdoor heat exchanger with the largest temperature difference, Δt min It represents the temperature difference between the cold and hot fluids on the same side of the outdoor heat exchanger with the smallest temperature difference. ln represents the natural logarithm.

[0132] In an optional embodiment, if the gas information detection device includes a first pressure sensor and a second pressure sensor, then

[0133] The first pressure sensor is provided at the air inlet of the outdoor unit and is used to detect the air inlet pressure of the outdoor unit;

[0134] The second pressure sensor is provided at the air outlet of the outdoor unit and is used to detect the pressure at the air outlet of the outdoor unit;

[0135] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0136] Acquire the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor;

[0137] Calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure;

[0138] The gas flow rate in the outdoor unit is obtained according to the difference and a preset resistance along the air-conditioning pipeline.

[0139] The embodiment of the present invention calculates the gas flow rate by measuring the pressure difference and temperature based on the relationship between the gas flow rate, the pressure difference and the temperature.

[0140] According to the ideal gas state equation, there is the following relationship between gas flow rate, pressure difference and temperature:

[0141]

[0142] Where qm represents the gas flow rate (unit, kg / s); P1 is the outdoor unit inlet pressure (unit, Pa); P2 is the outdoor unit outlet pressure (unit, Pa); S is the resistance along the air conditioning pipeline (unit, Pa / (kg / s) 2 ), which is preset in the air conditioner controller based on actual product measurements. The pipe refers to the pipe between the outdoor unit air inlet and the outdoor unit air outlet.

[0143] Among them, P1 is the starting pressure of the gas fluid, P2 is the ending pressure of the gas fluid, and then the pressure difference of the gas fluid is calculated, and finally the gas flow rate is calculated using the above formula.

[0144] For example, Figure 7 , Figure 7 This is a third working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention, including steps S31-S33;

[0145] S31, obtaining the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor, and proceeding to step S32;

[0146] S32, calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure, and proceeding to step S33;

[0147] S33: Divide the difference by the preset resistance along the air-conditioning pipeline, and perform a square root operation on the quotient to obtain the gas flow rate in the outdoor unit.

[0148] In an optional embodiment, if the gas information detection device includes a differential pressure device, one end of the device is connected to the inlet of the outdoor unit heat exchanger, and the other end is connected to the outlet of the outdoor unit heat exchanger, for detecting the pressure difference between the inlet of the outdoor unit heat exchanger and the outlet of the outdoor unit heat exchanger;

[0149] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0150] obtaining the pressure difference detected by the differential pressure device;

[0151] The gas flow rate in the outdoor unit is obtained according to a preset differential pressure device constant, a preset gas density and the pressure difference.

[0152] The present invention uses a differential pressure device to measure gas flow. The differential pressure device generally consists of a pipe, a starting pressure sensor, an ending pressure sensor, and a calculator. The differential pressure device can directly detect the pressure difference.

[0153] Specifically, the gas flow rate in the outdoor unit is calculated according to the following formula:

[0154]

[0155] Where qm represents the gas flow rate (unit, kg / s); C is the preset constant of the differential pressure device; ΔP represents the pressure difference detected by the differential pressure device (unit, Pa); ρ is the gas density, i.e., the density of the gas where the equipment is installed (unit, kg / m 3 ).

[0156] For example, Figure 8 , Figure 8 This is a fourth working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention, including steps S41-S44;

[0157] S41, obtaining the pressure difference detected by the differential pressure device, and proceeding to step S42;

[0158] S42, calculating the product of the pressure difference and the preset gas density, and proceeding to step S43;

[0159] S43, calculate the square root of the product result, and proceed to step S44;

[0160] S44. Multiply the square root result by a preset differential pressure device constant to obtain the gas flow rate in the outdoor unit.

[0161] In an optional embodiment, if the gas information detection device includes a wind speed sensor, the wind speed sensor is provided at the air inlet of the outdoor heat exchanger and is used to detect the wind speed at the air inlet of the outdoor heat exchanger;

[0162] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0163] Obtaining the wind speed detected by the wind speed sensor;

[0164] The preset mass flow correction coefficient is multiplied by the wind speed to obtain the gas flow in the outdoor unit.

[0165] Since the wind speed at the outdoor heat exchanger inlet is relatively stable, the embodiment of the present invention installs a wind speed sensor at the outdoor heat exchanger inlet to detect the wind speed. Based on the relative wind speed method, the gas flow rate is calculated by measuring the wind speed. Since the diffusion rate of pollutants in the air is positively correlated with the wind speed, the wind speed can be used to couple the gas flow rate. The following formula exists:

[0166] qm=k×v

[0167] Where: k is the mass flow correction coefficient, a constant related to the type of pollutant and environmental conditions, and this value is preset in the controller; v is the wind speed (unit, m / s).

[0168] For example, Figure 9 , Figure 9 This is a fifth working flow diagram of a controller in an air conditioner provided by one embodiment of the present invention, including steps S51-S52;

[0169] S51, obtaining the wind speed detected by the wind speed sensor, and proceeding to step S52;

[0170] S52: Multiply the preset mass flow correction coefficient by the wind speed to obtain the gas flow in the outdoor unit.

[0171] See also Figure 10 , Figure 10 This is a flow chart of a capacity detection method for an air conditioner provided by an embodiment of the present invention. The air conditioner at least includes: an indoor unit, which is provided with an indoor heat exchanger and an indoor fan; an outdoor unit, which is provided with an outdoor heat exchanger, an outdoor fan, a compressor, a flow regulating valve and a four-way valve, wherein the compressor, the flow regulating valve, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are connected by pipelines to form a refrigerant circulation loop; a first temperature sensor is provided at the inlet of the outdoor heat exchanger, for detecting the inlet temperature of the outdoor heat exchanger; a second temperature sensor is provided at the outlet of the outdoor heat exchanger, for detecting the outlet temperature of the outdoor heat exchanger; a gas information detection device is provided at the air inlet and / or the air outlet of the outdoor unit, for detecting gas information in the outdoor unit; the gas information includes at least one of gas pressure, gas wind speed, and the pressure difference between the air inlet and the air outlet of the outdoor unit, and the gas pressure includes the air inlet pressure of the outdoor unit and the air outlet pressure of the outdoor unit;

[0172] The capacity detection method of the air conditioner comprises:

[0173] S1. Acquire compressor power, outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and gas information detected by the gas information detection device;

[0174] S2. Calculating an inlet and outlet enthalpy difference based on the inlet temperature and outlet temperature of the outdoor heat exchanger;

[0175] S3. Calculating the gas flow rate in the outdoor unit based on the gas information;

[0176] S4. Detecting the cooling capacity / heating capacity of the air conditioner according to the inlet and outlet enthalpy difference, the gas flow rate, and the compressor power.

[0177] Optionally, the calculating the inlet and outlet enthalpy difference based on the inlet temperature and the outlet temperature of the outdoor heat exchanger includes:

[0178] Calculating a temperature difference characteristic according to the outdoor unit heat exchanger inlet temperature and the outdoor unit heat exchanger outlet temperature; wherein the temperature difference characteristic is an absolute value of the temperature difference or an average absolute value of the temperature difference;

[0179] The temperature difference characteristic is multiplied by the preset constant pressure specific heat to obtain the inlet and outlet enthalpy difference.

[0180] It is worth noting that enthalpy is a thermodynamic property that describes the thermodynamic properties of a substance at a certain temperature and pressure. It can be described by the temperature, pressure, and state variables of a substance. There is a close relationship between enthalpy and temperature, and the relationship between them can be expressed by thermodynamic equations. According to the first law of thermodynamics, the enthalpy of a substance can be expressed in terms of temperature. When the temperature increases, the enthalpy of the substance also increases, and vice versa. The change in the value is proportional to the change in temperature, that is:

[0181] Δh=|hin-hout|=c p |Δt|

[0182] Where Δh is the difference between inlet and outlet enthalpy (unit: J / kg); c p is the specific heat at constant pressure (unit, J / kg·K); Δt is the temperature difference characteristic (unit, K).

[0183] There are two methods to calculate the temperature difference feature:

[0184] |Δt|=|t in -t out |

[0185] Among them, t in is the inlet temperature of the outdoor unit heat exchanger (unit: K); t out is the outlet temperature of the outdoor unit heat exchanger (unit: K).

[0186] In order to simplify the calculation of the average temperature difference in complex arrangements, a correction factor is used for simplification, as follows:

[0187] |Δt|=ψ(Δt m ) ctf

[0188] Among them, (Δt m ) ctf It is the logarithmic mean temperature difference when the inlet and outlet temperatures of the given cold and hot fluids are arranged in countercurrent flow; ψ is the preset correction coefficient, which is filled in as a preset value according to the layout of the heat exchanger, and ψ<1.

[0189]

[0190] Where Δt max Represents the temperature difference between the hot and cold fluids on the same side of the outdoor heat exchanger with the largest temperature difference, Δt min It represents the temperature difference between the cold and hot fluids on the same side of the outdoor heat exchanger with the smallest temperature difference. ln represents the natural logarithm.

[0191] Optionally, if the gas information detection device includes a first pressure sensor and a second pressure sensor, then

[0192] The first pressure sensor is provided at the air inlet of the outdoor unit and is used to detect the air inlet pressure of the outdoor unit;

[0193] The second pressure sensor is provided at the air outlet of the outdoor unit and is used to detect the pressure at the air outlet of the outdoor unit;

[0194] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0195] Acquire the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor;

[0196] Calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure;

[0197] The gas flow rate in the outdoor unit is obtained according to the difference and a preset resistance along the air-conditioning pipeline.

[0198] The embodiment of the present invention calculates the gas flow rate by measuring the pressure difference and temperature based on the relationship between the gas flow rate, the pressure difference and the temperature.

[0199] According to the ideal gas state equation, there is the following relationship between gas flow rate, pressure difference and temperature:

[0200]

[0201] Where qm represents the gas flow rate (unit, kg / s); P1 is the outdoor unit inlet pressure (unit, Pa); P2 is the outdoor unit outlet pressure (unit, Pa); S is the resistance along the air conditioning pipeline (unit, Pa / (kg / s) 2 ), which is preset in the air conditioner controller based on actual product measurements. The pipe refers to the pipe between the outdoor unit air inlet and the outdoor unit air outlet.

[0202] Optionally, if the gas information detection device includes a differential pressure device, one end of the device is connected to the inlet of the outdoor unit heat exchanger, and the other end is connected to the outlet of the outdoor unit heat exchanger, for detecting the pressure difference between the inlet of the outdoor unit heat exchanger and the outlet of the outdoor unit heat exchanger;

[0203] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0204] obtaining the pressure difference detected by the differential pressure device;

[0205] The gas flow rate in the outdoor unit is obtained according to a preset differential pressure device constant, a preset gas density and the pressure difference.

[0206] The present invention uses a differential pressure device to measure gas flow. The differential pressure device generally consists of a pipe, a starting pressure sensor, an ending pressure sensor, and a calculator. The differential pressure device can directly detect the pressure difference.

[0207] Specifically, the gas flow rate in the outdoor unit is calculated according to the following formula:

[0208]

[0209] Where qm represents the gas flow rate (unit, kg / s); C is the preset constant of the differential pressure device; ΔP represents the pressure difference detected by the differential pressure device (unit, Pa); ρ is the gas density, i.e., the density of the gas where the equipment is installed (unit, kg / m 3 ).

[0210] Optionally, if the gas information detection device includes a wind speed sensor, the wind speed sensor is provided at the air inlet of the outdoor heat exchanger and is used to detect the wind speed at the air inlet of the outdoor heat exchanger;

[0211] The calculating the gas flow rate in the outdoor unit based on the gas information includes:

[0212] Obtaining the wind speed detected by the wind speed sensor;

[0213] The preset mass flow correction coefficient is multiplied by the wind speed to obtain the gas flow in the outdoor unit.

[0214] Since the wind speed at the outdoor heat exchanger inlet is relatively stable, the embodiment of the present invention installs a wind speed sensor at the outdoor heat exchanger inlet to detect the wind speed. Based on the relative wind speed method, the gas flow rate is calculated by measuring the wind speed. Since the diffusion rate of pollutants in the air is positively correlated with the wind speed, the wind speed can be used to couple the gas flow rate. The following formula exists:

[0215] qm=k×v

[0216] Where: k is the mass flow correction coefficient, a constant related to the type of pollutant and environmental conditions, and this value is preset in the controller; v is the wind speed (unit, m / s).

[0217] Optionally, detecting the cooling capacity / heating capacity of the air conditioner according to the inlet and outlet enthalpy difference, the gas flow rate, and the compressor power includes:

[0218] Calculating the product of the inlet and outlet enthalpy difference and the gas flow rate;

[0219] Subtracting the compressor power from the multiplication result to obtain the cooling capacity of the air conditioner;

[0220] Alternatively, the multiplication result is added to the compressor power to obtain the heating capacity of the air conditioner.

[0221] For example, the air conditioner cooling capacity / air conditioner heating capacity is calculated according to the following formula:

[0222] Qc=|hin-hout|×qm-W

[0223] Qh=|hin-hout|×qm+W

[0224] Where: Qc is the cooling capacity of the indoor unit, (unit, W); Qh is the heating capacity of the indoor unit, (unit, W); hin is the inlet enthalpy of the outdoor unit heat exchanger, (unit, J / kg); hout is the outlet enthalpy of the outdoor unit heat exchanger, (unit, J / kg); qm is the gas flow rate, (unit, kg / s); W is the compressor power, (unit, W).

[0225] An embodiment of the present invention provides a method for detecting the capacity of an air conditioner. It is not necessary to detect the capacity of the air conditioner in an enthalpy difference laboratory. The capacity of the air conditioner during actual operation can be detected by using information detected by a first temperature sensor, a second temperature sensor and a gas information detection device. The data collection is simple, and there are fewer other influencing factors in the detection process, so the detection results are more accurate.

[0226] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that: include: Indoor unit, which houses the indoor heat exchanger and indoor fan; An outdoor unit is provided with an outdoor heat exchanger, an outdoor fan, a compressor, a flow regulating valve and a four-way valve, wherein the compressor, the flow regulating valve, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are connected by pipelines to form a refrigerant circulation loop; The first temperature sensor is provided at the inlet of the outdoor unit heat exchanger and is used to detect the inlet temperature of the outdoor unit heat exchanger; The second temperature sensor is provided at the outlet of the outdoor unit heat exchanger and is used to detect the outlet temperature of the outdoor unit heat exchanger; a gas information detection device, provided at the air inlet and / or the air outlet of the outdoor unit, for detecting gas information in the outdoor unit; the gas information includes at least one of gas pressure, gas wind speed, and a pressure difference between the air inlet and the air outlet of the outdoor unit, the gas pressure including the air inlet pressure and the air outlet pressure of the outdoor unit; The controller is used to: Acquire the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device; Calculating an inlet and outlet enthalpy difference based on the inlet temperature and outlet temperature of the outdoor heat exchanger; Calculating the gas flow rate in the outdoor unit based on the gas information; The cooling capacity / heating capacity of the air conditioner is detected according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power.

2. The air conditioner according to claim 1, wherein The calculating the inlet and outlet enthalpy difference based on the inlet temperature and the outlet temperature of the outdoor heat exchanger includes: Calculating a temperature difference characteristic according to the outdoor unit heat exchanger inlet temperature and the outdoor unit heat exchanger outlet temperature; wherein the temperature difference characteristic is an absolute value of the temperature difference or an average absolute value of the temperature difference; The temperature difference characteristic is multiplied by the preset constant pressure specific heat to obtain the inlet and outlet enthalpy difference.

3. The air conditioner according to claim 1, wherein If the gas information detection device includes a first pressure sensor and a second pressure sensor, then The first pressure sensor is provided at the air inlet of the outdoor unit and is used to detect the air inlet pressure of the outdoor unit; The second pressure sensor is provided at the air outlet of the outdoor unit and is used to detect the pressure at the air outlet of the outdoor unit; The calculating the gas flow rate in the outdoor unit based on the gas information includes: Acquire the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor; Calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure; The gas flow rate in the outdoor unit is obtained according to the difference and a preset resistance along the air-conditioning pipeline.

4. The air conditioner according to claim 1, wherein If the gas information detection device includes a differential pressure device, one end of the device is connected to the inlet of the outdoor unit heat exchanger, and the other end is connected to the outlet of the outdoor unit heat exchanger, for detecting the pressure difference between the inlet of the outdoor unit heat exchanger and the outlet of the outdoor unit heat exchanger; The calculating the gas flow rate in the outdoor unit based on the gas information includes: obtaining the pressure difference detected by the differential pressure device; The gas flow rate in the outdoor unit is obtained according to a preset differential pressure device constant, a preset gas density and the pressure difference.

5. The air conditioner according to claim 1, wherein If the gas information detection device includes a wind speed sensor, it is provided at the air inlet of the outdoor heat exchanger to detect the wind speed at the air inlet of the outdoor heat exchanger; The calculating the gas flow rate in the outdoor unit based on the gas information includes: Obtaining the wind speed detected by the wind speed sensor; The preset mass flow correction coefficient is multiplied by the wind speed to obtain the gas flow in the outdoor unit.

6. The air conditioner according to claim 1, wherein: The detecting the cooling capacity / heating capacity of the air conditioner according to the inlet / outlet enthalpy difference, the gas flow rate, and the compressor power includes: Calculating the product of the inlet and outlet enthalpy difference and the gas flow rate; Subtracting the compressor power from the multiplication result to obtain the cooling capacity of the air conditioner; Alternatively, the multiplication result is added to the compressor power to obtain the heating capacity of the air conditioner.

7. A method for detecting the performance of an air conditioner, characterized in that: The air conditioner at least includes: an indoor unit, which is equipped with an indoor heat exchanger and an indoor fan; an outdoor unit, which is equipped with an outdoor heat exchanger, an outdoor fan, a compressor, a flow regulating valve and a four-way valve, and the compressor, the flow regulating valve, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are connected by pipelines to form a refrigerant circulation loop; a first temperature sensor is provided at the inlet of the outdoor heat exchanger, for detecting the inlet temperature of the outdoor heat exchanger; a second temperature sensor is provided at the outlet of the outdoor heat exchanger, for detecting the outlet temperature of the outdoor heat exchanger; a gas information detection device is provided at the air inlet and / or the air outlet of the outdoor unit, for detecting gas information in the outdoor unit; the gas information includes at least one of gas pressure, gas wind speed, and pressure difference between the air inlet of the outdoor unit and the air outlet of the outdoor unit, and the gas pressure includes the air inlet pressure of the outdoor unit and the air outlet pressure of the outdoor unit; The capacity detection method of the air conditioner comprises: Acquire the compressor power, the outdoor unit heat exchanger inlet temperature detected by the first temperature sensor, the outdoor unit heat exchanger outlet temperature detected by the second temperature sensor, and the gas information detected by the gas information detection device; Calculating an inlet and outlet enthalpy difference based on the inlet temperature and outlet temperature of the outdoor heat exchanger; Calculating the gas flow rate in the outdoor unit based on the gas information; The cooling capacity / heating capacity of the air conditioner is detected according to the inlet and outlet enthalpy difference, the gas flow rate and the compressor power.

8. The method for detecting the performance of an air conditioner according to claim 7, wherein: If the gas information detection device includes a first pressure sensor and a second pressure sensor, then The first pressure sensor is provided at the air inlet of the outdoor unit and is used to detect the air inlet pressure of the outdoor unit; The second pressure sensor is provided at the air outlet of the outdoor unit and is used to detect the pressure at the air outlet of the outdoor unit; The calculating the gas flow rate in the outdoor unit based on the gas information includes: Acquire the outdoor unit air inlet pressure detected by the first pressure sensor and the outdoor unit air outlet pressure detected by the second pressure sensor; Calculating the difference between the outdoor unit air inlet pressure and the outdoor unit air outlet pressure; The gas flow rate in the outdoor unit is obtained according to the difference and a preset resistance along the air-conditioning pipeline.

9. The method for detecting the performance of an air conditioner according to claim 7, wherein: If the gas information detection device includes a differential pressure device, one end of the device is connected to the inlet of the outdoor unit heat exchanger, and the other end is connected to the outlet of the outdoor unit heat exchanger, for detecting the pressure difference between the inlet of the outdoor unit heat exchanger and the outlet of the outdoor unit heat exchanger; The calculating the gas flow rate in the outdoor unit based on the gas information includes: obtaining the pressure difference detected by the differential pressure device; The gas flow rate in the outdoor unit is obtained according to a preset differential pressure device constant, a preset gas density and the pressure difference.

10. The air conditioner capacity detection method according to claim 7, wherein: If the gas information detection device includes a wind speed sensor, it is provided at the air inlet of the outdoor heat exchanger to detect the wind speed at the air inlet of the outdoor heat exchanger; The calculating the gas flow rate in the outdoor unit based on the gas information includes: Obtaining the wind speed detected by the wind speed sensor; The preset mass flow correction coefficient is multiplied by the wind speed to obtain the gas flow in the outdoor unit.

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