A method and system for testing the operating energy efficiency of a building air conditioning unit

Abstract

The present invention belongs to the technical field of energy efficiency monitoring. More specifically, it relates to a method and system for testing the operating energy efficiency of a building air conditioning unit. When testing the operating energy efficiency of a building air conditioning unit, the present invention first simulates different load operating states of the building air conditioning unit, and can simulate abnormal working conditions such as extreme weather and sudden power outages. At the same time, when calculating the energy efficiency, according to the operating characteristics of the building air conditioning unit and the operating conditions of the building air conditioning unit, the building air conditioning unit is divided into different operating load intervals, and targeted load adjustment strategies are carried out, so as to achieve accurate testing of the energy efficiency of the building air conditioning under different operating states. When the building air conditioning unit is in the partial load operating state, first calculate the initial energy efficiency of the building air conditioning unit, and then only correct the air conditioning energy consumption according to the current operating load and ambient temperature of the air conditioner, so that the energy efficiency calculation of the building air conditioning unit in the partial load operating state is more accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy efficiency monitoring, and more specifically, relates to a method and system for testing the operating energy efficiency of a building air-conditioning unit. Background Art

[0002] Building energy consumption accounts for a relatively large proportion of the total energy consumption and has become one of the focuses of global attention. According to relevant data, the total energy consumption of the whole process of buildings in the country in 2020 was 2.27 billion tce, accounting for 45.5% of the total national energy consumption. Among them, in the energy consumption during the building operation stage, as the main component of building energy consumption, the energy consumption of the air-conditioning system cannot be underestimated. In public buildings, the energy consumption of the air-conditioning system can even be as high as more than 50% of the total building energy consumption. Therefore, accurate testing of the energy efficiency of the air-conditioning system is of great significance for achieving building energy conservation.

[0003] At present, although there are already some standards and methods for testing the energy efficiency of air-conditioning systems, such as the "Technical Standard for Energy Efficiency Improvement of Heating and Air-Conditioning Systems in Public Buildings", etc., there are still some deficiencies in their actual applications. First of all, this energy efficiency testing method does not consider the operating load of the air-conditioning unit, resulting in low accuracy of energy efficiency testing; at the same time, in the existing technology, when the air-conditioning operates at part load, there is a lack of an accurate energy efficiency calculation method, which also leads to low accuracy of energy efficiency calculation when the air-conditioning operates at part load. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for testing the operating energy efficiency of a building air-conditioning unit to improve the accuracy of building air-conditioning energy efficiency testing.

[0005] To solve the above technical problems, the present invention specifically provides the following technical solutions: A method for testing the operating energy efficiency of a building air-conditioning unit specifically includes the steps of:

[0006] S1: Adjust the operating load of the building air-conditioning unit to control the building air-conditioning unit to enter different load operating states;

[0007] S2: Collect the environmental parameter data and air-conditioning unit data of the building air-conditioning unit under different loads;

[0008] S3: Perform data preprocessing operations on the environmental parameter data and air-conditioning unit data of the building air-conditioning unit under different loads to obtain the preprocessed environmental parameter data and air-conditioning unit data;

[0009] S4: Calculate the energy efficiency of the building air-conditioning unit under different operating loads according to the preprocessed environmental parameter data and air-conditioning unit data;

[0010] S5: Generate a test report for the building air-conditioning unit based on the final energy efficiency of the building air-conditioning unit.

[0011] Preferably, in S1, the adjustment range of the operating load of the building air-conditioning unit is from 30% of the rated load to 110% of the rated load. Specifically, S1 is as follows: Divide the adjustment range into different intervals, and adopt different adjustment strategies for different intervals to achieve load adjustment.

[0012] Preferably, according to the historical operating energy efficiency fluctuation of the building air-conditioning unit, divide the adjustment range into a first load operating interval and a second load operating interval. The adjustment range of the first load operating interval is from 30% of the rated load to 80% of the rated load, and the adjustment range of the second load operating interval is from 80% of the rated load to 110% of the rated load.

[0013] Preferably, for the first load operating interval, the adjustment strategy is that the load adjustment step is 3%; for the second load operating interval, the adjustment strategy is that the load adjustment step is 5%.

[0014] Preferably, S4 is specifically as follows:

[0015] When the building air-conditioning unit operates in the first load operating interval, calculate the energy efficiency of the building air-conditioning unit using the first air-conditioning energy efficiency calculation method; when the building air-conditioning unit operates in the second load operating interval, calculate the energy efficiency of the building air-conditioning unit using the second air-conditioning energy efficiency calculation method.

[0016] Preferably, the first air-conditioning energy efficiency calculation method is specifically as follows:

[0017] S4.a: Calculate the initial energy efficiency of the building air-conditioning unit;

[0018] Wherein, the initial energy efficiency The calculation formula is:

[0019] ;

[0020] ,

[0021] In the formula, is the cooling capacity of the building air-conditioning unit under different operating loads is the compressor input power, is the pump power, is the fan power, ρ is the refrigerant fluid density in the building air-conditioning unit, is the refrigerant specific heat capacity in the building air-conditioning unit, ΔT is the supply and return water temperature difference, F is the flow rate in the building air-conditioning unit;

[0022] S4.b: Modify the initial energy efficiency of the building air conditioning unit according to the operating load of the building air conditioning unit to obtain the energy efficiency of the building air conditioning unit after the first modification;

[0023] Specifically, the formula for the first modification is:

[0024] ;

[0025] In the formula, is the energy efficiency of the building air conditioning unit after the first modification, is the characteristic coefficient of the building air conditioning unit, obtained through factory calibration, and PR is the operating load of the current building air conditioning unit;

[0026] S4.c: Perform a second modification on the energy efficiency of the building air conditioning unit after the first modification according to the ambient temperature to obtain the final energy efficiency of the building air conditioning unit;

[0027] Among them, the formula for the second modification is:

[0028] ;

[0029] In the formula, is the final energy efficiency of the building air conditioning unit, is the temperature sensitivity coefficient, and T is the ambient temperature value.

[0030] Preferably, the second air conditioning energy efficiency calculation method is:

[0031] Calculate the initial energy efficiency of the building air conditioning unit;

[0032] Among them, the initial energy efficiency The calculation formula is:

[0033] ;

[0034] ,

[0035] In the formula, is the cooling capacity of the building air conditioning unit under different operating loads is the compressor input power, is the pump power, is the fan power, ρ is the density of the refrigerant fluid in the building air conditioning unit, is the specific heat capacity of the refrigerant in the building air conditioning unit, ΔT is the supply and return water temperature difference, and F is the flow rate in the building air conditioning unit;

[0036] Take the initial energy efficiency as the final energy efficiency of the building air conditioning unit.

[0037] Preferably, an electric control valve and a variable frequency water pump group control system are used to adjust the operating load of the building air conditioner unit; among them, the electric control valve is a Belimo LR24A-SR valve with an opening degree of 0.1%, and it receives PLC instructions through the Modbus RTU protocol to achieve load adjustment.

[0038] Using a variable frequency water pump group control system to adjust the operating load of the building air conditioner unit specifically means: configuring an ABB ACS880 frequency converter for each water pump, with a frequency adjustment step of 0.1 Hz, to achieve precise flow control, and then achieve the adjustment of the operating load of the building air conditioner unit.

[0039] Preferably, in S2, the preprocessing operation includes data cleaning and data denoising.

[0040] According to another aspect of the present invention, a system for testing the operating energy efficiency of a building air conditioner unit is provided. The system uses the above-mentioned method for testing the operating energy efficiency of a building air conditioner unit, and the system further includes:

[0041] A load adjustment module for adjusting the operating load of the building air conditioner unit to control the building air conditioner unit to enter different load operating states;

[0042] A data acquisition module for collecting environmental parameter data and air conditioner unit data of the building air conditioner unit under different loads;

[0043] A data preprocessing module for performing data preprocessing operations on the environmental parameter data and air conditioner unit data of the building air conditioner unit under different loads to obtain preprocessed environmental parameter data and air conditioner unit data;

[0044] An energy efficiency calculation module for calculating the energy efficiency of the building air conditioner unit under different operating loads according to the preprocessed environmental parameter data and air conditioner unit data;

[0045] A test report generation module for generating a test report of the building air conditioner unit according to the final energy efficiency of the building air conditioner unit.

[0046] The present invention has the following beneficial effects compared with the prior art:

[0047] When testing the operating energy efficiency of a building air conditioner unit, the present invention first simulates different load operating states of the building air conditioner unit, thus realizing support for various disturbance modes such as step, ramp, and sine, and can simulate abnormal conditions such as extreme weather and sudden power outages; at the same time, when calculating the energy efficiency, according to the operating characteristics of the building air conditioner unit and the operating conditions of the building air conditioner unit, the building air conditioner unit is divided into different load operating intervals, and targeted load adjustment strategies are carried out, so as to accurately test the energy efficiency of the building air conditioner under different operating states.

[0048] When the building air-conditioning unit is operating at part load, first calculate the initial energy efficiency of the building air-conditioning unit, and then correct the air-conditioning energy consumption only according to the current operating load and ambient temperature of the air conditioner, so that the energy efficiency calculation of the building air-conditioning unit at part load is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained by extending according to the provided drawings without creative efforts.

[0050] Figure 1 It is a flowchart of a method for testing the operating energy efficiency of a building air-conditioning unit provided by an embodiment of the present invention;

[0051] Figure 2 It is a flowchart of calculating the energy efficiency of the building air-conditioning unit by using the first air-conditioning energy efficiency calculation method provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0053] The following will first explain the concepts involved in the present application with reference to the drawings. It should be noted here that the explanations of the following concepts are only for making the content of the present application easier to understand, and do not represent the limitation of the protection scope of the present application; at the same time, without conflict, the embodiments and the features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0054] As Figure 1 shown, the present invention provides a method for testing the operating energy efficiency of a building air-conditioning unit, which specifically includes the steps:

[0055] S1: Adjust the operating load of the building air-conditioning unit to control the building air-conditioning unit to enter different load operating states;

[0056] Wherein, in this step, the adjustment range of the operating load of the building air-conditioning unit is from 30% rated load to 110% rated load;

[0057] In this step, an electric control valve and a variable frequency water pump group control system are used to adjust the operating load of the building air conditioning unit. Among them, the electric control valve is a Belimo LR24A-SR valve with an opening degree of 0.1%. It receives PLC instructions through the Modbus RTU protocol to achieve load adjustment.

[0058] Using the variable frequency water pump group control system to adjust the operating load of the building air conditioning unit specifically means: configuring an ABB ACS880 frequency converter for each water pump, with a frequency adjustment step of 0.1 Hz, to achieve precise flow control, and then achieve the adjustment of the operating load of the building air conditioning unit.

[0059] In this embodiment, by setting the electric control valve and the variable frequency group control system, precise adjustment of the operating load of the building air conditioning unit is achieved, thus supporting various disturbance modes such as step, ramp, and sine, and abnormal conditions such as extreme weather and sudden power outages can be simulated.

[0060] Furthermore, the S1 is specifically: dividing the adjustment range into different intervals, and adopting different adjustment strategies for different intervals to achieve load adjustment.

[0061] Specifically, according to the historical operating energy efficiency fluctuation of the building air conditioning unit, the adjustment range is divided into a first load operating interval and a second load operating interval. The adjustment range of the first load operating interval is from 30% rated load to 80% rated load, and the adjustment range of the second load operating interval is from 80% rated load to 110% rated load.

[0062] Among them, for the first load operating interval, the adjustment strategy is that the load adjustment step is 3%; for the second load operating interval, the adjustment strategy is that the load adjustment step is 5%.

[0063] When the building air conditioning unit is in the first load operating interval, since the air conditioning unit is in a partial load operating state at this time, compared with the air conditioning unit operating close to full rated load, the air conditioning unit is more likely to have a problem of low energy efficiency at this time. Therefore, in this embodiment, according to the operating conditions of the building air conditioning unit, the building air conditioning unit is divided into different load operating intervals, so as to achieve accurate testing of the energy efficiency of the building air conditioning in different operating states.

[0064] S2: Collect the environmental parameter data and air conditioning unit data of the building air conditioning unit under different loads.

[0065] Among them, the environmental parameter data includes temperature data at multiple points within the operating area of the building air conditioning unit.

[0066] Temperature sensors should be installed at multiple points in the operating area of the building's air-conditioning units. These sensors should be arranged according to a certain spatial distribution pattern (for example, they should be installed in a dispersed manner) to ensure that they can fully reflect the actual operating environment of the air-conditioning units. At the same time, the average temperature collected by different temperature sensors should be used as the environmental parameter data of the air-conditioning.

[0067] The air conditioning unit data includes the operating power, cooling capacity, supply and return water temperature difference, refrigerant flow rate, etc. of different equipment in the air conditioner;

[0068] Specifically, the air-conditioning unit data may be acquired through a control system of the air-conditioning unit itself or a building automation system connected to the air-conditioning unit.

[0069] Furthermore, in this step, since a large amount of data is obtained, it is necessary to synchronize the data. Specifically, after different sensors collect environmental parameter data or air conditioning unit data, the IEEE 1588 Precision Time Protocol (PTP) is used to achieve microsecond-level clock synchronization. The main clock source uses the Meinberg M600 GPS synchronizer. At the same time, a test data timestamp index is established to ensure that the environmental parameter data or air conditioning unit data are time-aligned;

[0070] Specifically, the time deviation is <10ms.

[0071] S3: preprocessing the environmental parameter data and air conditioning unit data of the building air conditioning unit under different loads to obtain preprocessed environmental parameter data and air conditioning unit data;

[0072] Wherein, the preprocessing operation includes data cleaning, data denoising, etc.;

[0073] The data cleaning is to remove invalid data from the environmental parameter data and the air conditioning unit data. In this embodiment, for the invalid data types that often appear in the data acquisition stage, three invalid data types are listed, namely, over-range data, sudden change jump, and communication interruption. See Table 1 for details. Table 1 shows the judgment conditions and processing methods for the three invalid data types of over-range data, sudden change jump, and communication interruption.

[0074] Table 1 Judgment conditions and processing methods for three invalid data types

[0075]

[0076] The data denoising is mainly used to remove noise caused by electromagnetic interference, mechanical vibration, etc. Specifically, wavelet threshold denoising is used to perform denoising operations on the environmental parameter data and air conditioning unit data;

[0077] Specifically, the db4 wavelet basis function is used to perform data denoising operations.

[0078] S4: Calculate the energy efficiency of the building air-conditioning unit at different operating loads based on the pre-processed environmental parameter data and air-conditioning unit data;

[0079] Among them, the specific content of S4 is:

[0080] When the building air-conditioning unit operates in the first load operating range, use the first air-conditioning energy efficiency calculation method to calculate the energy efficiency of the building air-conditioning unit; when the building air-conditioning unit operates in the second load operating range, use the second air-conditioning energy efficiency calculation method to calculate the energy efficiency of the building air-conditioning unit

[0081] Among them, as Figure 2 shown, the specific content of the first air-conditioning energy efficiency calculation method is:

[0082] S4.a: Calculate the initial energy efficiency of the building air-conditioning unit;

[0083] Among them, the initial energy efficiency The calculation formula is:

[0084] ;

[0085] ,

[0086] In the formula, is the cooling capacity of the building air-conditioning unit at different operating loads is the compressor input power, is the water pump power, is the fan power, ρ is the refrigerant fluid density in the building air-conditioning unit, is the refrigerant specific heat capacity in the building air-conditioning unit, ΔT is the supply-return water temperature difference, F is the flow rate in the building air-conditioning unit;

[0087] S4.b: Correct the initial energy efficiency of the building air-conditioning unit according to the operating load of the building air-conditioning unit to obtain the energy efficiency of the building air-conditioning unit after the first correction;

[0088] Specifically, the formula for the first correction is:

[0089] ;

[0090] In the formula, is the energy efficiency of the building air-conditioning unit after the first correction, is the characteristic coefficient of the building air-conditioning unit, obtained through factory calibration, PR is the current operating load of the building air-conditioning unit;

[0091] S4.c: Perform a second correction on the energy efficiency of the building air-conditioning unit after the first correction according to the environmental temperature to obtain the final energy efficiency of the building air-conditioning unit;

[0092] Among them, the second corrected formula is:

[0093] ;

[0094] In the formula, is the energy efficiency of the final building air-conditioning unit, is the temperature sensitivity coefficient, which is -0.03 / °C in this embodiment, and T is the ambient temperature value;

[0095] In this embodiment, when the building air-conditioning unit is in the partial load operation state, this embodiment first calculates the initial energy efficiency of the building air-conditioning unit, and then corrects the air-conditioning energy consumption only according to the current operating load and ambient temperature of the air conditioner, so that the energy efficiency calculation of the building air-conditioning unit in the partial load operation state is more accurate.

[0096] Among them, the second air-conditioning energy efficiency calculation method is:

[0097] Calculate the initial energy efficiency of the building air-conditioning unit;

[0098] Among them, the initial energy efficiency The calculation formula is:

[0099] ;

[0100] ,

[0101] In the formula, is the cooling capacity of the building air-conditioning unit under different operating loads is the compressor input power, is the pump power, is the fan power, ρ is the refrigerant fluid density in the building air-conditioning unit, is the refrigerant specific heat capacity in the building air-conditioning unit, ΔT is the supply-return water temperature difference, and F is the flow rate in the building air-conditioning unit;

[0102] Take the initial energy efficiency as the final energy efficiency of the building air-conditioning unit.

[0103] S5: Form a test report of the building air-conditioning unit according to the final energy efficiency of the building air-conditioning unit.

[0104] Embodiment 2, this embodiment further includes a building air-conditioning unit operation energy efficiency test system. The system adopts the building air-conditioning unit operation energy efficiency test method of Embodiment 1, and the system further includes:

[0105] A load adjustment module for adjusting the operating load of the building air-conditioning unit, so as to control the air-conditioning unit to enter different load operation states;

[0106] A data acquisition module, configured to acquire the environmental parameter data and air conditioner unit data of the building air conditioner unit under different loads;

[0107] A data preprocessing module, configured to perform data preprocessing operations on the environmental parameter data and air conditioner unit data of the building air conditioner unit under different loads, so as to obtain the preprocessed environmental parameter data and air conditioner unit data;

[0108] An energy efficiency calculation module, configured to calculate the energy efficiency of the building air conditioner unit under different operating loads according to the preprocessed environmental parameter data and air conditioner unit data;

[0109] A test report generation module, configured to generate a test report of the building air conditioner unit according to the final energy efficiency of the building air conditioner unit.

[0110] Embodiment 3. This embodiment includes an electronic device, including a processor and a memory. A program or instruction that can run on the processor is stored on the memory. When the program or instruction is executed by the processor, each step of the method for testing the operating energy efficiency of the building air conditioner unit in Embodiment 1 is implemented, and the same technical effect can be achieved.

[0111] Embodiment 4. This embodiment includes a computer-readable storage medium. A data processing program is stored on the computer-readable storage medium. The data processing program is executed by the processor to implement each step of the method for testing the operating energy efficiency of the building air conditioner unit in Embodiment 1.

[0112] Those skilled in the art should understand that the embodiments herein can be provided as a method, a device (equipment), or a computer program product. Therefore, the embodiments herein can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Including but not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium generally includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium.

[0113] This text is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (devices), and computer program products according to the embodiments of the present text. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or a device for implementing the functions specified in multiple blocks.

[0114] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the steps of the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or multiple steps of the functions specified in multiple blocks.

[0115] The above-described embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for implementing the technology of the present invention, and do not impose any formal restrictions on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, can make some changes or modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the essence of the present invention. Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for testing the operating energy efficiency of a building air conditioning unit, characterized in that, Specifically, it includes the following steps: S1: Adjust the operating load of the building air conditioning unit to control the building air conditioning unit to enter different load operating states; S2: Collect the environmental parameter data and air conditioning unit data of the building air conditioning unit under different loads; S3: Perform data preprocessing operations on the environmental parameter data and air conditioning unit data of the building air conditioning unit under different loads to obtain the preprocessed environmental parameter data and air conditioning unit data; S4: Calculate the energy efficiency of the building air conditioning unit under different operating loads according to the preprocessed environmental parameter data and air conditioning unit data; Specifically, S4 is as follows: When the building air conditioning unit operates in the first load operating range, use the first air conditioning energy efficiency calculation method to calculate the energy efficiency of the building air conditioning unit; when the building air conditioning unit operates in the second load operating range, use the second air conditioning energy efficiency calculation method to calculate the energy efficiency of the building air conditioning unit; Among them, the specific content of the first air conditioning energy efficiency calculation method is: S4.a: Calculate the initial energy efficiency of the building air conditioning unit; S4.b: Correct the initial energy efficiency of the building air conditioning unit according to the operating load of the building air conditioning unit to obtain the energy efficiency of the building air conditioning unit after the first correction; S4.c: Perform a second correction on the energy efficiency of the building air conditioning unit after the first correction according to the environmental temperature to obtain the final energy efficiency of the building air conditioning unit; The second air conditioning energy efficiency calculation method is: Calculate the initial energy efficiency of the building air conditioning unit; Take the initial energy efficiency as the final energy efficiency of the building air conditioning unit; S5: Form a test report of the building air conditioning unit according to the final energy efficiency of the building air conditioning unit.

2. The operating energy efficiency test method for a building air conditioning unit according to claim 1, characterized in that, In S1, the adjustment range of the operating load of the building air conditioning unit is from 30% rated load to 110% rated load. Specifically, S1 is as follows: Divide the adjustment range into different intervals, and adopt different adjustment strategies for different intervals to achieve load adjustment.

3. The method for testing the operating energy efficiency of a building air-conditioning unit according to claim 2, wherein, According to the historical operating energy efficiency fluctuation situation of the building air conditioning unit, divide the adjustment range into the first load operating range and the second load operating range. The adjustment range of the first load operating range is from 30% rated load to 80% rated load, and the adjustment range of the second load operating range is from 80% rated load to 110% rated load.

4. The operating energy efficiency test method for a building air conditioning unit according to claim 3, characterized in that, For the first load operating range, the adjustment strategy is that the load adjustment step is 3%; for the second load operating range, the adjustment strategy is that the load adjustment step is 5%.

5. The method for testing the operating energy efficiency of a building air-conditioning unit according to claim 1, wherein Among them, In S4.a, the initial energy efficiency The calculation formula is: , , In the formula, is the refrigerating capacity of the building air-conditioning unit under different operating loads is the input power of the compressor, is the power of the water pump, is the power of the fan, ρ is the density of the refrigerant fluid in the building air-conditioning unit, is the specific heat capacity of the refrigerant in the building air-conditioning unit, ΔT is the temperature difference between the supply and return water, and F is the flow rate in the building air-conditioning unit; Among them, in S4.b, the formula for the first correction is: ； In the formula, is the energy efficiency of the building air-conditioning unit after the first correction, is the characteristic coefficient of the building air-conditioning unit, and PR is the operating load of the current building air-conditioning unit; Among them, in S4.c, the formula for the second correction is: ; In the formula, is the energy efficiency of the final building air conditioner unit, is the temperature sensitivity coefficient, and T is the ambient temperature value.

6. The operating energy efficiency test method for a building air conditioning unit according to claim 1, characterized in that, Among them, In the second air conditioner energy efficiency calculation method, the initial energy efficiency The calculation formula is as follows: Wherein, is the refrigerating capacity of the building air conditioning unit under different operating loads is the input power of the compressor, is the pump power, is the fan power, ρ is the density of the refrigerant fluid in the building air conditioning unit, is the specific heat capacity of the refrigerant in the building air conditioning unit, ΔT is the temperature difference between the supply and return water, and F is the flow rate in the building air conditioning unit.

7. The method for testing the operating energy efficiency of a building air-conditioning unit according to claim 1, characterized in that In S1, an electric control valve and a variable frequency water pump group control system are used to adjust the operating load of the building air conditioning unit; Among them, the electric control valve is a Belimo LR24A-SR valve with an opening degree of 0.1%. It receives PLC instructions through the Modbus RTU protocol to achieve load regulation. The specific method of using the variable frequency water pump group control system to regulate the operating load of the building air conditioning unit is as follows: Each water pump is equipped with an ABB ACS880 frequency converter with a frequency adjustment step of 0.1 Hz to achieve precise flow control, and then achieve the regulation of the operating load of the building air conditioning unit.

8. The method for testing the operating energy efficiency of a building air-conditioning unit according to claim 1, wherein In the step S2, the preprocessing operation includes data cleaning and data denoising.

9. An operating energy efficiency test system for a building air conditioning unit, characterized in that, The system adopts a method for testing the operating energy efficiency of a building air conditioning unit according to any one of claims 1-8. The system includes: A load regulation module for regulating the operating load of the building air conditioning unit to control the building air conditioning unit to enter different load operating states; A data acquisition module for collecting environmental parameter data and air conditioning unit data of the building air conditioning unit under different loads; A data preprocessing module for performing data preprocessing operations on the environmental parameter data and air conditioning unit data of the building air conditioning unit under different loads to obtain preprocessed environmental parameter data and air conditioning unit data; An energy efficiency calculation module for calculating the energy efficiency of the building air conditioning unit under different operating loads according to the preprocessed environmental parameter data and air conditioning unit data; A test report generation module for generating a test report of the building air conditioning unit according to the final energy efficiency of the building air conditioning unit.

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