Method and system for measuring operation energy efficiency of multi-split air conditioner

Abstract

The invention belongs to the technical field of energy efficiency measurement, and provides a multi-split air conditioner operation energy efficiency measurement method and system.The method comprises the steps that firstly, the temperature and relative humidity of air entering an outdoor unit of the multi-split air conditioner are obtained, and the air outlet temperature and relative humidity of the outdoor unit of the multi-split air conditioner and the multi-point real-time air speed of a fan are obtained; then according to the relative humidity, the air temperature and the multi-point real-time air speed of the draught fan, the moisture content, the enthalpy value and the exhaust air volume mass flow rate are obtained; and finally, according to the enthalpy value and the exhaust air volume mass flow, the multi-split air conditioner outdoor unit side heat dissipating capacity and the multi-split air conditioner outdoor unit side heat taking capacity are determined, and according to the multi-split air conditioner outdoor unit side heat dissipating capacity and the multi-split air conditioner outdoor unit side heat taking capacity, the multi-split air conditioner refrigerating energy efficiency and the multi-split air conditioner heating energy efficiency are determined. The energy efficiency of the multi-split system is calculated and deduced from the air enthalpy difference of the outdoor unit side of the multi-split system, the method is reliable, no correction value interference exists, the number of data measuring points is small, on the basis that the energy efficiency measuring accuracy is guaranteed, the implementation is high, and compared with a temperature difference mode, the method is more reliable and effective.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy efficiency measurement, and in particular relates to a method and system for measuring the energy efficiency of a multi-connected machine. Background Art

[0002] Since the multi-split unit is a fluorine system, the ratio of the gas-liquid phase change of the refrigerant in the pipeline is unclear; therefore, the energy efficiency of the multi-split unit during actual operation cannot be calculated by the supply and return water temperature and chilled water flow rate like the chiller, nor can the actual cooling capacity be calculated by dividing the actual cooling capacity by the actual power consumption.

[0003] At present, the commonly used method is to use the operating curves and correction coefficients under various operating conditions obtained during factory testing to derive the real-time cooling capacity of the multi-split unit based on the operating frequency of the multi-split compressor, the fan speed, and various theoretical correction coefficients. However, the reliability of various theoretical correction coefficients is questionable, and different manufacturers have different correction coefficients. The factory-tested operating conditions are quite different from the actual operating environment. For example, in actual projects, the multi-split unit is often limited by installation conditions and requires the addition of a deflector cover. At this time, the air volume corresponding to the fan speed will deviate significantly from the factory-tested conditions, resulting in poor accuracy in energy efficiency measurement. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a method and system for measuring the energy efficiency of multi-split operation. The present invention adopts the method of calculating and deriving the energy efficiency of the multi-split system from the air enthalpy difference on the outdoor unit side of the multi-split unit. The method is reliable, has no interference from correction values, and has few data measurement points. On the basis of ensuring the accuracy of energy efficiency measurement, it has high feasibility and is more reliable and effective than the temperature difference method.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the present invention provides a method for measuring the energy efficiency of a multi-connected system, comprising:

[0007] Obtain the air temperature and relative humidity entering the multi-split outdoor unit, as well as the air outlet temperature, relative humidity, and real-time wind speed at multiple points of the fan;

[0008] According to the obtained relative humidity, the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side are obtained;

[0009] According to the obtained air temperature, the humidity of the air on the inlet side and the humidity of the air on the outlet side, the enthalpy value on the inlet side and the enthalpy value on the outlet side are obtained;

[0010] Determine the exhaust air mass flow rate based on the real-time wind speed at multiple points of the fan and the area of ​​the air outlet of the multi-split outdoor unit;

[0011] According to the difference between the enthalpy value on the air inlet side and the enthalpy value on the air outlet side, as well as the exhaust air mass flow rate, the heat dissipation and heat intake of the multi-split outdoor unit are determined;

[0012] The cooling energy efficiency and heating energy efficiency of the multi-split system are determined based on the heat dissipation and heat intake of the multi-split outdoor unit.

[0013] Furthermore, when obtaining the real-time wind speed at multiple points of the fan, the circular air outlet is divided into several annular areas of equal area, and a measuring point is set in each annular area, or the rectangular air duct with the deflector is divided into several rectangular sections, and a measuring point is set in each rectangular section; the weighted average of the flow velocity at each measuring point is used as the average flow velocity of the fluid passing through the pipeline.

[0014] Furthermore, the calculation formula of moisture content d is:

[0015]

[0016] in, is the relative humidity measured by the humidity sensor; P q·b is the saturated water vapor pressure, a single-valued function of temperature, which can be found in the thermal engineering manual; B is the local atmospheric pressure.

[0017] Furthermore, the calculation formula of enthalpy h is:

[0018] h=c p·g ·t+(γ+c p·q ·t)d;

[0019] Among them, c p·g is the constant pressure specific heat capacity of dry air; c p·q is the constant-pressure specific heat of water vapor; γ is the latent heat of vaporization of water vapor; d is the moisture content; t is the air temperature.

[0020] Furthermore, the calculation formula of the enthalpy value h is: The cooling energy efficiency EER of the multi-split unit and the heating energy efficiency COP of the multi-split unit are:

[0021] EER=(Q 制冷 -P 外 -P 内 ) / (P 外 +P 内 );

[0022] COP=(Q 制热 +P 外 +P 内 ) / (P 外 +P 内 );

[0023] Among them, Q 制冷 is the heat dissipation on the outdoor unit side; Q制热 Take heat for outdoor unit; P 外 is the outdoor unit input power; P 内 Input power for the indoor unit.

[0024] Furthermore, when frost occurs in winter, the frost heat correction is added and the outdoor unit heat Q 制热 , and the heating energy efficiency COP of the multi-split system is:

[0025] Q 制热 =G(h 进 -h 出 )+γ 冰 ·(d 进 -d 出 )·G

[0026] COP=(Q 制热 +P 外 +P 内 ) / (P 外 +P 内 )

[0027] Among them, γ 冰 is the latent heat of freezing of water, G is the exhaust air mass flow rate; h 进 is the enthalpy value on the air inlet side; h 出 is the enthalpy value on the outlet side; γ 冰 is the latent heat of freezing of water;

[0028] During defrosting, the test condition is tested continuously for 1 hour, and the number of readings is automatically recorded every 10 seconds. The test is continued for 60 minutes, and the average value of each reading is taken as the test value. The corresponding heat Q is calculated each time. 制热 , then there are 360 ​​groups of Q 制热 Data, the total heat taken in 60 minutes is Q 总 , the heating energy efficiency COP after defrost correction is:

[0029] COP=(Q 总 +W) / W;

[0030]

[0031] Where W is the power consumption of the outdoor unit and indoor unit within 60 minutes.

[0032] In a second aspect, the present invention further provides a multi-connected operation energy efficiency measurement system, comprising:

[0033] The data acquisition module is configured to: obtain the air temperature and relative humidity entering the multi-split outdoor unit, and obtain the air outlet temperature, relative humidity and multi-point real-time wind speed of the multi-split outdoor unit;

[0034] The moisture content determination module is configured to: obtain the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side according to the acquired relative humidity;

[0035] The enthalpy value determination module is configured to: obtain the enthalpy value of the air inlet side and the enthalpy value of the air outlet side according to the obtained air temperature, the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side;

[0036] The exhaust air mass flow determination module is configured to: determine the exhaust air mass flow according to the real-time wind speed at multiple points of the fan and the area of ​​the air outlet of the multi-split outdoor unit;

[0037] The heat dissipation and heat intake determination module is configured to determine the heat dissipation and heat intake of the multi-split outdoor unit based on the difference between the enthalpy value of the air inlet side and the enthalpy value of the air outlet side, as well as the mass flow rate of the exhaust air;

[0038] The energy efficiency determination module is configured to determine the cooling energy efficiency and heating energy efficiency of the multi-split system according to the heat dissipation and heat intake of the multi-split outdoor unit.

[0039] In a third aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the multi-connected operation energy efficiency measurement method described in the first aspect.

[0040] In a fourth aspect, the present invention further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the program, the steps of the multi-connected operation energy efficiency measurement method described in the first aspect are implemented.

[0041] In a fifth aspect, the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the multi-connected operation energy efficiency measurement method described in the first aspect are implemented.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] In the present invention, first, the air temperature and relative humidity of the air entering the multi-split outdoor unit are obtained, as well as the air outlet temperature, relative humidity and multi-point real-time wind speed of the multi-split outdoor unit are obtained; then, according to the relative humidity, air temperature and multi-point real-time wind speed of the fan, the moisture content, enthalpy value and exhaust air mass flow rate are obtained; finally, according to the enthalpy value and exhaust air mass flow rate, the heat dissipation on the side of the multi-split outdoor unit and the heat intake on the side of the multi-split outdoor unit are determined, and according to the heat dissipation on the side of the multi-split outdoor unit and the heat intake on the side of the multi-split outdoor unit, the cooling energy efficiency and heating energy efficiency of the multi-split unit are determined; the energy efficiency of the multi-split system is calculated and derived from the air enthalpy difference on the side of the multi-split outdoor unit. The method is reliable, has no interference from correction values, has few data measurement points, has high feasibility while ensuring the accuracy of energy efficiency measurement, and is more reliable and effective than the temperature difference method. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings constituting a part of the specification of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments and descriptions of this embodiment are used to explain this embodiment and do not constitute an improper limitation on this embodiment.

[0045] Figure 1 Schematic diagram of measuring points in Example 1 of the present invention;

[0046] Figure 2 This is a flow chart of the method of Example 1 of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0048] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0049] Example 1:

[0050] In order to solve the problem that the system energy efficiency cannot be accurately measured during the actual operation of the multi-split system, the system energy efficiency can only be given by relying on various correction coefficients, black box principles, and built-in programs of the manufacturer; since the essence of air conditioning is to transport heat, outdoor heat = indoor heat + compressor energy consumption, this embodiment provides a multi-split operation energy efficiency measurement method, which can be applied to the calculation of summer cooling energy efficiency and winter heating energy efficiency. Specifically, the energy efficiency of the multi-split system is calculated and derived from the air enthalpy difference on the outdoor unit side. The method is reliable, without interference from correction values, with very few data measurement points, and has high feasibility. It is more reliable and effective than the temperature difference method. The energy efficiency measurement method in this embodiment is also applicable to the measurement of outdoor unit operating conditions in summer when water spray is added to the air inlet side to improve the cooling effect, and is also applicable to the measurement of operating conditions under frosting conditions in winter. The energy efficiency measurement method includes:

[0051] S1. Collect the air temperature t entering the multi-split outdoor unit 进 and relative humidity

[0052] Optionally, a temperature sensor and a humidity sensor are arranged on the air inlet side of the multi-split outdoor unit to measure the air temperature t entering the multi-split outdoor unit. 进 and relative humidity

[0053] S2. Collect the air outlet temperature t of the multi-split outdoor unit 出 , relative humidity And the wind turbine's multi-point real-time wind speed V1~V n :

[0054] Optionally, a temperature sensor, a humidity sensor, and a hot wire anemometer or a pressure tube anemometer are arranged on the air outlet side of the multi-split outdoor unit to measure the air outlet temperature t 出 , relative humidity And the wind turbine's multi-point real-time wind speed V1~V n ; Where n is the number of hot wire anemometers or pressure tube anemometers, or the number of wind speed measurement points.

[0055] It should be noted that the temperature sensor should be placed to avoid direct sunlight. If the air inlet side of the outdoor unit faces direct sunlight, a black shading sheet can be used for partial shielding. Figure 1 shown.

[0056] S3. Measure the diameter D (m) of the circular air outlet of the outdoor unit, or the length and width L1 (m) and L2 (m) of the rectangular air duct with a deflector.

[0057] S4. The measuring points of the hot wire anemometer or pressure tube anemometer are arranged according to the logarithmic-linear method. The circular air outlet is divided into several annular areas of equal area, or the rectangular air duct with the air guide cover is divided into several small rectangular sections. The weighted average of the flow velocity at each measuring point is the average flow velocity V of the fluid passing through the duct. 均 (m / s).

[0058] S5. Determination of the humidity content of the air on the inlet and outlet sides:

[0059] Optionally, the humidity of the air on the inlet side d 进 (kg / kg 干 ) and the humidity of the air on the outlet side d 进 (kg / kg 干 ) is calculated based on the formula:

[0060]

[0061] Where, d is the moisture content; is the relative humidity measured by the humidity sensor; P q·b is the saturated water vapor pressure, P a , P q·b is a single-valued function of temperature, which can be found in the thermal engineering manual; B is the local atmospheric pressure.

[0062] Alternatively, the temperature t and relative humidity measured by the temperature sensor can be obtained from the hd diagram of the local atmospheric pressure. Find out the humidity of the air on the air inlet side 进 and the humidity of the air on the outlet side d 进 .

[0063] S6. Determine the enthalpy value h on the air inlet side 进 and the enthalpy value h on the outlet side 出 :

[0064] Determine the enthalpy h on the air inlet side 进 and the enthalpy value h on the outlet side 出 The basis formula is:

[0065] h=c p·g ·t+(γ+c p·q ·t)d

[0066] Among them, c p·g =1.005kj / (kg·℃) is the constant pressure specific heat capacity of dry air; c p·q =1.84kj / (kg·℃) is the constant pressure specific heat capacity of water vapor; γ = 2500-2.35t is the latent heat of vaporization of water vapor (kj / kg), γ can also be simplified to 2500 here; d is the moisture content, the weight of water vapor in 1kg of dry air kg / kg 干 , obtained through step S5; t is the air temperature measured by the temperature sensor.

[0067] Alternatively, the temperature t and relative humidity measured by the temperature sensor can be obtained from the hd diagram of the local atmospheric pressure. The enthalpy value h on the air inlet side can be found 进 and the enthalpy value h on the outlet side 出 .

[0068] S7. Determine the exhaust air mass flow rate:

[0069] Optionally, the exhaust air mass flow rate G (kg / s) is calculated as:

[0070] G=V 均 *π*D 2 / 4*ρ or G=V 均 *L1*L2*ρ

[0071] Where ρ is the air density (kg / m3).

[0072] S8. Calculate the heat dissipation Q on the outdoor unit side based on the data in steps S6 and S7. 制冷 , or outdoor unit heat Q 制热 The absolute value of:

[0073] Q 制冷 =G(h 出 -h 进 )(kw)

[0074] Q 制热 =G(h 进 -h 出 )(kw)

[0075] S9. Determine the outdoor unit input power P 外 And the indoor unit input power P 内 :

[0076] Optionally, an external power analyzer can be installed on the power input line of the multi-split outdoor unit to directly measure the outdoor unit input power P 外 (kw); and an external power analyzer is installed at the power input line end of the corresponding multi-split indoor unit to directly measure the indoor unit input power P 内 (kw).

[0077] S10. Determine the cooling energy efficiency (EER) and heating energy efficiency (COP) of the VRF system:

[0078] EER=(Q 制冷 -P 外 -P 内 ) / (P 外 +P 内 )

[0079] COP=(Q 制热 +P 外 +P 内 ) / (P 外 +P 内 )

[0080] The method in this embodiment can be used to measure the energy efficiency in the actual operation and maintenance of multi-split units, and can provide more reliable data support in the fields of operation and maintenance projects, renovation projects, etc. It has clear logic, no various uncertain correction coefficients, and high feasibility in application. It is suitable for multi-split units of various brands, and through actual energy efficiency measurements, it can provide a basis for energy-saving operation and maintenance and renovation judgments.

[0081] Example 2:

[0082] This embodiment provides a method for measuring the energy efficiency of a VRF unit. Based on the energy efficiency measurement method described in Example 1, the following method can be used to test the heating performance of the unit during frosting and defrosting in winter:

[0083] S1, add frost heat correction, outdoor unit heat Q 制热 (kw), and the heating energy efficiency COP of the multi-split unit is:

[0084] Q 制热 =G(h 进 -h 出 )+γ 冰 ·(d 进 -d 出 )·G

[0085] COP=(Q 制热 +P 外 +P 内 ) / (P 外 +P 内 )

[0086] Among them, γ 冰 is the latent heat of freezing of water (kj / kg), and the optional value is 334kj / kg.

[0087] S2, taking into account the defrost correction, carry out continuous 1 hour test conditions, automatically record 1 time every 10 seconds, measure continuously for 60 minutes, and take the average value of each reading as the test value, calculate the corresponding Q each time 制热 , then there are 360 ​​groups of Q 制热 Data, the total heat taken in 60 minutes is Q 总 (KW·H) is:

[0088]

[0089] Use an electric meter to count the power consumption of the outdoor and indoor units in 60 minutes (W (KW·H)), or calculate the power consumption of the outdoor and indoor units in 60 minutes (W):

[0090]

[0091] The heating performance coefficient after considering defrost correction is COP=(Q 总 +W) / W.

[0092] During defrost, the multi-connection system is actually switched to refrigeration mode. 制热 If the value is negative, the indoor air is blowing cold air. Therefore, the above calculation can be used to obtain the actual heating capacity and actual power consumption of the multi-split unit within 60 minutes, which is consistent with the actual energy efficiency calculation results. The detection process in Example 1 and Example 2 must comply with the requirements of the relevant standards for energy-saving detection of public buildings.

[0093] Example 3:

[0094] This embodiment provides a multi-connected energy efficiency measurement system, including:

[0095] The data acquisition module is configured to: obtain the air temperature and relative humidity entering the multi-split outdoor unit, and obtain the air outlet temperature, relative humidity and multi-point real-time wind speed of the multi-split outdoor unit;

[0096] The moisture content determination module is configured to: obtain the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side according to the acquired relative humidity;

[0097] The enthalpy value determination module is configured to: obtain the enthalpy value of the air inlet side and the enthalpy value of the air outlet side according to the obtained air temperature, the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side;

[0098] The exhaust air mass flow determination module is configured to: determine the exhaust air mass flow according to the real-time wind speed at multiple points of the fan and the area of ​​the air outlet of the multi-split outdoor unit;

[0099] The heat dissipation and heat intake determination module is configured to determine the heat dissipation and heat intake of the multi-split outdoor unit based on the difference between the enthalpy value of the air inlet side and the enthalpy value of the air outlet side, as well as the mass flow rate of the exhaust air;

[0100] The energy efficiency determination module is configured to determine the cooling energy efficiency and heating energy efficiency of the multi-split system according to the heat dissipation and heat intake of the multi-split outdoor unit.

[0101] The working method of the system is the same as the multi-connected operation energy efficiency measurement method in Example 1, and will not be repeated here.

[0102] Example 4:

[0103] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the multi-connected system operation energy efficiency measurement method described in Embodiment 1 are implemented.

[0104] Example 5:

[0105] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, the steps of the multi-connected system energy efficiency measurement method described in Example 1 are implemented.

[0106] Example 6:

[0107] This embodiment provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the multi-connected system operation energy efficiency measurement method described in Example 1 are implemented.

[0108] The above description is merely a preferred embodiment of this embodiment and is not intended to limit this embodiment. Those skilled in the art will readily appreciate that this embodiment may be modified and varied in various ways. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this embodiment shall be within the scope of protection of this embodiment.

Claims

1. A method for measuring the energy efficiency of a multi-connected system, characterized in that: include: Obtain the air temperature and relative humidity entering the multi-split outdoor unit, as well as the air outlet temperature, relative humidity, and real-time wind speed at multiple points of the fan; According to the obtained relative humidity, the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side are obtained; According to the obtained air temperature, the humidity of the air on the inlet side and the humidity of the air on the outlet side, the enthalpy value on the inlet side and the enthalpy value on the outlet side are obtained; Determine the exhaust air mass flow rate based on the real-time wind speed at multiple points of the fan and the area of ​​the air outlet of the multi-split outdoor unit; According to the difference between the enthalpy value on the air inlet side and the enthalpy value on the air outlet side, as well as the exhaust air mass flow rate, the heat dissipation and heat intake of the multi-split outdoor unit are determined; The cooling energy efficiency and heating energy efficiency of the multi-split system are determined based on the heat dissipation and heat intake of the multi-split outdoor unit.

2. A method for measuring energy efficiency of a multi-connected system according to claim 1, characterized in that: When obtaining the real-time wind speed at multiple points of the fan, the circular air outlet is divided into several annular areas of equal area, and a measuring point is set in each annular area, or the rectangular air duct with a deflector is divided into several rectangular sections, and a measuring point is set in each rectangular section; the weighted average of the flow velocity at each measuring point is used as the average flow velocity of the fluid passing through the pipeline.

3. The method for measuring energy efficiency of a multi-connected system according to claim 1, wherein: The calculation formula for moisture content d is: in, is the relative humidity measured by the humidity sensor; P q·b is the saturated water vapor pressure; B is the local atmospheric pressure.

4. The method for measuring energy efficiency of a multi-connected system according to claim 1, wherein: The calculation formula for enthalpy h is: h=c p·g ·t+(γ+c p·q ·t)d; Among them, c p·g is the constant pressure specific heat capacity of dry air; c p·q is the constant-pressure specific heat of water vapor; γ is the latent heat of vaporization of water vapor; d is the moisture content; and t is the air temperature.

5. The method for measuring energy efficiency of a multi-connected system according to claim 1, wherein: The calculation formula for the enthalpy value h is: The cooling energy efficiency EER of the multi-split unit and the heating energy efficiency COP of the multi-split unit are: HONOR=(Q 制冷 -P 外 -P 内 ) / (P 外 +P 内 ); COP=(Q 制热 +P 外 +P 内 ) / (P 外 +P 内 ); Among them, Q 制冷 is the heat dissipation on the outdoor unit side; Q 制热 Take heat for outdoor unit; P 外 is the outdoor unit input power; P 内 Input power for the indoor unit.

6. The method for measuring energy efficiency of a multi-connected system according to claim 1, wherein: In winter, when frost occurs, add frost heat correction, and the outdoor unit takes heat Q 制热 , and the heating energy efficiency COP of the multi-split system is: Q 制热 =G(h 进 -h 出 )+γ 冰 ·(d 进 -d 出 )·G COP=(Q 制热 +P 外 +P 内 ) / (P 外 +P 内 ) Among them, γ 冰 is the latent heat of freezing of water, G is the exhaust air mass flow rate; h 进 is the enthalpy value on the air inlet side; h 出 is the enthalpy value on the outlet side; γ 冰 is the latent heat of freezing of water; During defrosting, the test condition is carried out continuously for 1 hour, and the number of readings is automatically recorded every 10 seconds. The measurement is continuously carried out for 60 minutes, and the average value of each reading is taken as the test value. The corresponding heat Q is calculated each time. 制热 , then there are 360 ​​groups of Q 制热 Data, the total heat taken in 60 minutes is Q 总 , the heating energy efficiency COP after defrost correction is: COP=(Q 总 +W) / W; Where W is the power consumption of the outdoor unit and indoor unit within 60 minutes.

7. A multi-connected operation energy efficiency measurement system, characterized in that: include: The data acquisition module is configured to: obtain the air temperature and relative humidity entering the multi-split outdoor unit, and obtain the air outlet temperature, relative humidity and multi-point real-time wind speed of the multi-split outdoor unit; The moisture content determination module is configured to: obtain the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side according to the acquired relative humidity; The enthalpy value determination module is configured to: obtain the enthalpy value of the air inlet side and the enthalpy value of the air outlet side according to the obtained air temperature, the moisture content of the air on the air inlet side and the moisture content of the air on the air outlet side; The exhaust air mass flow determination module is configured to: determine the exhaust air mass flow according to the real-time wind speed at multiple points of the fan and the area of ​​the air outlet of the multi-split outdoor unit; The heat dissipation and heat intake determination module is configured to determine the heat dissipation and heat intake of the multi-split outdoor unit based on the difference between the enthalpy value of the air inlet side and the enthalpy value of the air outlet side, as well as the mass flow rate of the exhaust air; The energy efficiency determination module is configured to determine the cooling energy efficiency and heating energy efficiency of the multi-split system according to the heat dissipation and heat intake of the multi-split outdoor unit.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the multi-connected system operation energy efficiency measurement method according to any one of claims 1 to 6 are implemented.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the steps of the multi-connected system operation energy efficiency measurement method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the multi-connected system operation energy efficiency measurement method according to any one of claims 1 to 6 are implemented.

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