System for testing performance of ground source heat pump unit

Abstract

The invention relates to the technical field of heat pump unit control, and particularly discloses a ground source heat pump unit performance test system which comprises a four-dimensional temperature sensing network, a dual-channel flow detection unit, a data acquisition module, a trend prediction module and a compressor frequency regulation and control module. Comprehensive application of the control system for the performance of the ground source heat pump unit has important significance in improving energy efficiency, reducing energy consumption and guaranteeing system stability. And through accurate monitoring, intelligent regulation and control and future trend prediction, the ground source heat pump system can be more efficient. And the operation state of the system can be monitored and adjusted in real time by monitoring the frequency of the compressor. By monitoring the frequency of the compressor, the system can know the operation condition of the compressor in time, and therefore adjustment can be conducted according to the actual condition, and the system is kept in the optimal working state. The real-time monitoring and adjustment can effectively improve the operation efficiency of the system, reduce the energy consumption and prolong the service life of the equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump unit control and relates to a test system for the performance of a ground-source heat pump unit. Background Art

[0002] Monitoring the compressor frequency performance of a ground-source heat pump unit is crucial for the operational stability of the system, energy efficiency optimization, and extension of equipment life. By monitoring and adjusting the compressor frequency, the system can dynamically adjust according to the actual working conditions, maintain the best operating state, and thus achieve the goals of energy conservation, emission reduction, and improvement of energy utilization efficiency. Monitoring the compressor frequency can help the system achieve dynamic regulation of energy consumption, adjust the frequency according to the real-time energy efficiency situation, enable the system to maintain a highly efficient and stable operating state under different working conditions, minimize energy waste to the greatest extent, and improve the overall performance of the system.

[0003] However, there are still some defects and drawbacks in the current technology for monitoring the compressor frequency performance of ground-source heat pump units. First of all, traditional frequency monitoring systems often can only provide static frequency data and lack the ability to monitor and analyze the trend of frequency changes in real time. This results in the system being unable to respond to changes in working conditions in a timely manner, unable to make timely frequency adjustments, and affecting the energy efficiency and stability of the system.

[0004] Secondly, there are certain limitations in the data accuracy and acquisition frequency in the existing technology for frequency performance monitoring. The acquisition frequency of some systems is relatively low, unable to achieve high-frequency monitoring of frequency changes, resulting in inaccurate monitoring of the real-time operating state of the system. This leads to the system being unable to make effective adjustments to instantaneous working conditions, affecting the response speed and performance of the system.

[0005] In addition, the degree of intelligence of some existing frequency monitoring systems still needs to be improved. The lack of intelligent algorithm support and data analysis ability makes the system unable to make intelligent frequency adjustment decisions based on historical data and real-time situations, restricting the optimization ability and self-adaptability of the system.

[0006] In summary, although the importance of monitoring the compressor frequency performance of ground-source heat pump units is self-evident, there are still certain technical defects and drawbacks in the current technology in terms of monitoring accuracy, real-time performance, and degree of intelligence. The future development direction should be to improve the accuracy and frequency of the monitoring system, strengthen the application of data analysis and intelligent algorithms, so as to achieve more accurate and intelligent monitoring and control of the compressor frequency performance, and further improve the energy efficiency and stability of the ground-source heat pump system. Summary of the Invention

[0007] In view of the above problems existing in the prior art, the present invention provides a test system for the performance of a ground-source heat pump unit to solve the above technical problems.

[0008] To achieve the above and other objects, the technical solution adopted by the present invention is as follows:

[0009] On the one hand, the present invention provides a test system for the performance of a ground source heat pump unit, comprising:

[0010] A four-dimensional temperature sensing network, which is composed of four groups of high-precision temperature sensors. The specific installation positions are as follows: The ground source side inlet temperature sensor is installed at 1.5 times the pipe diameter downstream of the outlet of the ground source side circulation pump to measure the temperature of the soil heat exchange medium entering the unit; the ground source side outlet temperature sensor is arranged at the flange connection of the outlet of the ground source side heat exchanger to detect the temperature of the medium after heat exchange by the unit; the air-conditioning side inlet temperature sensor is installed on the straight pipe section of the return water pipe of the user terminal; the air-conditioning side outlet temperature sensor is set at the inlet of the air-conditioning side circulation pump to monitor the water supply temperature output to the building.

[0011] A dual-channel flow detection unit, which includes a ground source side ultrasonic flowmeter and an air-conditioning side ultrasonic flowmeter; the ground source side ultrasonic flowmeter adopts the time difference measurement principle and is installed on the vertical pipe section; the air-conditioning side ultrasonic flowmeter integrates temperature compensation function and is installed on the horizontal pipe section, and the measurement error ≤ ±1%.

[0012] A data acquisition module, which is configured with four PT1000 platinum resistance input channels, a dual-channel pulse counting unit, and a power measurement unit to collect the input power of the compressor and the circulation pump at time t in real time.

[0013] The system includes an energy efficiency calculation module, which performs the following calculation steps:

[0014] Collect the temperature T1 of the ground source side inlet temperature sensor at time t and the temperature T2 of the ground source side outlet temperature sensor at time t;

[0015] When T1 is greater than T2, it is determined that the ground source heat pump unit is in the heating mode at time t;

[0016] When T1 is less than T2, it is determined that the ground source heat pump unit is in the cooling mode at time t;

[0017] Calculate the heat transfer amount of the ground source heat pump unit in the heating mode at time t ; ρ is the water density, c is the specific heat capacity at constant pressure of water, F2 is the measured value of the air-conditioning side ultrasonic flowmeter at time t; T4 and T3 respectively represent the measured values of the air-conditioning side outlet temperature sensor and the air-conditioning side inlet temperature sensor at time t;

[0018] At the same time, calculate the heat transfer amount of the ground source heat pump unit in the cooling mode at time t ; F1 is the measured value of the ground source side ultrasonic flowmeter at time t.

[0019] The operation logic of the energy efficiency calculation module also includes:

[0020] Obtain the heat transfer quantity Q(t) of the ground source heat pump unit at time t, where the value of Q(t) is or ;

[0021] And collect the input powers of the compressor and the circulation pump at time t, denoted as W1(t) and W2(t) respectively;

[0022] Finally, calculate the energy efficiency ratio of the ground source heat pump unit at time t .

[0023] The system includes a trend prediction module, including:

[0024] Adopt the ARIMA time series model:

[0025] Furthermore, predict the energy efficiency ratio of the ground source heat pump unit at time t+1 ;

[0026] The calculation formula is ;

[0027] In the above formula Represents the p-th autoregressive coefficient and the first autoregressive coefficient in the autoregressive model, COP(t) is the energy efficiency ratio of the ground source heat pump unit at time t, Is the energy efficiency ratio of the ground source heat pump unit at time t-p+1; Represents the white noise sequence at time point t, which is the error term of the ARIMA time series model and is used to describe the random fluctuations that cannot be explained by the model; Represents the moving average coefficients of the white noise sequence at time points t-1 and t-q, which are used to describe the lag effect of the error term and the influence of the error term in the more distant period respectively.

[0028] When the energy efficiency gradient η of the monitored ground source heat pump unit is less than -0.05 / min, use the analysis formula , and analyze to obtain the adjustment frequency value ;

[0029] In the above formula Represents the current frequency value of the compressor corresponding to the ground source heat pump unit; Is the target value of the energy efficiency ratio corresponding to the ground source heat pump unit; Represents the current energy efficiency ratio value corresponding to the ground source heat pump unit, K is the system inertia coefficient, and usually the system inertia coefficient is set within the range of the empirical value 3-5;

[0030] When η is greater than 0.1 / min, start the following compensation algorithm:

[0031] Analyze to obtain the adjustment frequency value of the compressor corresponding to the ground source heat pump unit , They are respectively the gain coefficients in the PID control algorithm.

[0032] The energy efficiency gradient of the ground source heat pump unit is calculated by the formula:

[0033] , where is the energy efficiency ratio of the ground source heat pump unit at time t - 1, are respectively the time points of time t and time t - 1; η is the energy efficiency gradient of the ground source heat pump unit.

[0034] The current energy efficiency ratio value corresponding to the ground source heat pump unit is calculated by the formula:

[0035] If it is identified that the ground source heat pump unit is in the heating mode at time t, then calculate the energy efficiency ratio of the ground source heat pump unit at time t , where is the circulating water flow rate on the air-conditioning side, are respectively the water supply temperatures output by the ground source heat pump unit and input to the building; is the power of the circulating pump on the air-conditioning side;

[0036] If it is identified that the ground source heat pump unit is in the cooling mode at time t, then calculate the energy efficiency ratio of the ground source heat pump unit at time t , where is the circulating water flow rate on the ground source side, are respectively the water temperatures returned by the underground heat exchanger to the ground source heat pump unit and the water temperature entering the ground source heat pump unit; is the power of the circulating pump on the ground source side;

[0037] Obtain the current energy efficiency ratio value corresponding to the ground source heat pump unit , The specific value range is or .

[0038] As described above, a test system for the performance of a ground source heat pump unit provided by the present invention has at least the following beneficial effects:

[0039] The ground source heat pump unit is a heating and cooling system with relatively high energy utilization efficiency, and its performance regulation is crucial for improving energy efficiency and reducing energy consumption. Through the comprehensive application of the above technical components and control logic, the accurate monitoring and intelligent regulation of the performance of the ground source heat pump unit are realized, which has the following benefits and necessities:

[0040] First, the application of the four-dimensional temperature sensing network and the dual-channel flow detection unit enables the system to comprehensively sense the temperature and flow conditions on the ground source and air-conditioning sides, thereby achieving an in-depth understanding of the energy transfer process. This meticulous monitoring helps improve the stability and efficiency of the system and reduce energy waste.

[0041] Secondly, the configuration of the data acquisition module and the operation of the energy efficiency calculation module provide the system with real-time data support and energy efficiency evaluation capabilities. By calculating the heating and cooling conditions, the system can make dynamic adjustments according to the actual situation to ensure the optimization of the energy efficiency ratio. This intelligent energy efficiency management not only improves the working efficiency of the system but also reduces energy consumption.

[0042] The introduction of the trend prediction module enables the system to have the ability to predict the future energy efficiency trend, and corresponding adjustments can be made in advance to avoid energy waste caused by excessive energy efficiency fluctuations. This predictive control strategy helps the stable operation of the system and improves the intelligent level of the system.

[0043] Finally, the design of the compressor frequency regulation module adjusts the compressor frequency in real time according to the energy efficiency gradient, enabling the system to make dynamic adjustments according to the actual working conditions and maintain the best working state. This frequency regulation strategy can effectively reduce the system energy consumption, extend the equipment life, and improve the operation efficiency and stability of the system.

[0044] In summary, the comprehensive application of the control system for the performance of the ground source heat pump unit is of great significance in improving energy efficiency, reducing energy consumption, and ensuring the stability of the system. Through precise monitoring, intelligent control, and future trend prediction, the ground source heat pump system can be made more intelligent and efficient. Brief Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention. Detailed Embodiments

[0047] The above content is only an example and explanation of the concept of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined by the claims of the present invention, they should all belong to the protection scope of the present invention.

[0048] Embodiment 1

[0049] Please refer to Figure 1 as shown, a test system for the performance of a ground source heat pump unit, comprising:

[0050] A four-dimensional temperature sensing network, composed of four groups of high-precision temperature sensors. The specific installation locations are as follows: The ground source side inlet temperature sensor: installed 1.5 times the pipe diameter downstream of the outlet of the ground source side circulation pump to measure the temperature of the soil heat exchange medium entering the unit; The ground source side outlet temperature sensor: arranged at the flange connection of the outlet of the ground source side heat exchanger to detect the temperature of the medium after heat exchange by the unit; The air-conditioning side inlet temperature sensor is installed on the straight pipe section of the return water pipe of the user terminal; The air-conditioning side outlet temperature sensor is set at the inlet of the air-conditioning side circulation pump to monitor the water supply temperature output to the building;

[0051] A dual-channel flow detection unit, including a ground source side ultrasonic flowmeter and an air-conditioning side ultrasonic flowmeter; The ground source side ultrasonic flowmeter adopts the time difference measurement principle and is installed on the vertical pipe section; The air-conditioning side ultrasonic flowmeter integrates temperature compensation function and is installed on the horizontal pipe section, with a measurement error ≤ ±1%;

[0052] A data acquisition module, configured with four PT1000 platinum resistance input channels, a dual-channel pulse counting unit, and a power measurement unit, to collect the input power of the compressor and the circulation pump at time t in real time.

[0053] The system includes an energy efficiency calculation module, which performs the following calculation steps:

[0054] Collect the temperature T1 of the ground source side inlet temperature sensor at time t and the temperature T2 of the ground source side outlet temperature sensor at time t;

[0055] When T1 is greater than T2, it is determined that the ground source heat pump unit is in the heating mode at time t;

[0056] When T1 is less than T2, it is determined that the ground source heat pump unit is in the cooling mode at time t;

[0057] Calculate the heat transfer amount of the ground source heat pump unit in the heating mode at time t ; ρ is the water density, c is the specific heat capacity at constant pressure of water, and F2 is the measured value of the air-conditioning side ultrasonic flowmeter at time t; T4 and T3 respectively represent the measured values of the air-conditioning side outlet temperature sensor and the air-conditioning side inlet temperature sensor at time t;

[0058] At the same time, calculate the heat transfer amount of the ground source heat pump unit in the cooling mode at time t ; F1 is the measured value of the ground source side ultrasonic flowmeter at time t.

[0059] The operation logic of the energy efficiency calculation module also includes:

[0060] Obtain the heat transfer quantity Q(t) of the ground source heat pump unit at time t, where the value of Q(t) is or ;

[0061] And collect the input powers of the compressor and the circulation pump at time t, denoted as W1(t) and W2(t) respectively;

[0062] W1(t) represents the input power of the compressor at time t, that is, the power consumed by the compressor. The compressor is one of the core components in the ground source heat pump system, responsible for compressing the refrigerant or working medium and transferring it to the heat exchanger to complete the refrigeration or heating cycle. The magnitude of the input power directly reflects the energy consumption of the compressor.

[0063] W2(t) represents the input power of the circulation pump at time t, that is, the power consumed by the circulation pump. The circulation pump in the ground source heat pump system is used to circulate the medium (such as water or other fluids) to achieve heat transfer. The input power of the circulation pump reflects the energy required to pump the medium.

[0064] Finally, calculate the energy efficiency ratio of the ground source heat pump unit at time t .

[0065] The system includes a trend prediction module, including:

[0066] Adopt the ARIMA time series model:

[0067] Furthermore, predict the energy efficiency ratio of the ground source heat pump unit at time t + 1 ;

[0068] The calculation formula is ;

[0069] In the above formula represents the p-th autoregressive coefficient and the first autoregressive coefficient in the autoregressive model, COP(t) is the energy efficiency ratio of the ground source heat pump unit at time t, is the energy efficiency ratio of the ground source heat pump unit at time t - p + 1; represents the white noise sequence at time point t, which is the error term of the ARIMA time series model and is used to describe the random fluctuations that cannot be explained by the model; represents the moving average coefficients of the white noise sequence at time points t - 1 and t - q, which are used to describe the lag effect of the error term and the influence of the error term in the more distant period respectively.

[0070] When the energy efficiency gradient η of the monitored ground source heat pump unit is less than -0.05 / min, use the analysis formula , and analyze to obtain the adjustment frequency value ;

[0071] In the above formula represents the current frequency value of the compressor corresponding to the ground source heat pump unit; is the target value of the energy efficiency ratio corresponding to the ground source heat pump unit; represents the current energy efficiency ratio value corresponding to the ground source heat pump unit, K is the system inertia coefficient, and usually the system inertia coefficient is set within the range of the empirical values 3 - 5;

[0072] When η is greater than 0.1 / min, start the following compensation algorithm:

[0073] , analyze and obtain the adjusted frequency value of the compressor corresponding to the ground source heat pump unit , are the gain coefficients in the PID control algorithm respectively.

[0074] The compressor frequency plays a crucial role in the ground source heat pump unit. It directly affects the system's operating efficiency, energy consumption, and the lifespan of the equipment. Monitoring the compressor frequency can achieve real-time monitoring and adjustment of the system's operating status. By monitoring the compressor frequency, the system can timely understand the operating conditions of the compressor, including the load situation and energy efficiency performance, etc., so as to adjust according to the actual situation and keep the system in the best working state. This real-time monitoring and adjustment can effectively improve the system's operating efficiency, reduce energy consumption, and extend the lifespan of the equipment.

[0075] Secondly, monitoring the compressor frequency helps to optimize the energy efficiency performance of the system. By real-time monitoring the compressor frequency and combining with the actual working conditions of the system, frequency adjustment can be made according to the change of the energy efficiency ratio, so that the system can maintain a high energy efficiency performance under different working conditions. This targeted adjustment can maximize the energy efficiency of the system, reduce energy waste, and achieve the goal of energy conservation and emission reduction.

[0076] In addition, monitoring the compressor frequency can also help the system achieve intelligent operation. By combining the monitoring of the compressor frequency with the intelligent control system, automatic adjustment and optimized operation of the system can be realized. The intelligent operation mode can automatically adjust the compressor frequency according to the real-time data and preset parameters of the system, so that the system can maintain the best operating state under different working conditions, and improve the stability and reliability of the system.

[0077] However, there are currently some technical deficiencies and drawbacks that affect the monitoring effect of the compressor frequency performance of ground source heat pump units. One of the main problems is the lack of accuracy and real-time performance in frequency monitoring for some systems. The monitoring equipment used in some systems has low precision and the monitoring frequency is not timely enough, resulting in the inability to accurately capture the changes in the compressor frequency and affecting the real-time adjustment ability of the system. In this case, the system cannot respond to the changes in working conditions in a timely manner, affecting the energy efficiency performance and stability of the system.

[0078] In addition, some systems lack intelligence and self-adaptability in compressor frequency monitoring. The functions of the monitoring equipment and control systems in some systems are relatively simple and cannot perform intelligent adjustment according to the actual working conditions and requirements of the system, resulting in the inability to achieve the best energy efficiency performance under different working conditions. The monitoring system lacking intelligence and self-adaptability is prone to cause energy waste and equipment loss, affecting the long-term stable operation of the system.

[0079] Therefore, in view of these technical deficiencies and drawbacks, the future monitoring technology for the compressor frequency performance of ground source heat pump units needs to be continuously innovated and improved, improving the accuracy and real-time performance of the monitoring equipment, strengthening intelligence and self-adaptability, in order to achieve more accurate monitoring and adjustment of the system operation state, thereby further improving the energy efficiency performance and stability of the system.

[0080] The energy efficiency gradient of the ground source heat pump unit is calculated by the formula:

[0081] , where is the energy efficiency ratio of the ground source heat pump unit at time t - 1, are the time points at time t and time t - 1 respectively; η is the energy efficiency gradient of the ground source heat pump unit.

[0082] The energy efficiency ratio corresponding to the current state of the ground source heat pump unit is calculated by the formula:

[0083] If it is identified that the ground source heat pump unit is in the heating working condition at time t, then calculate the energy efficiency ratio of the ground source heat pump unit at time t , where is the circulating water flow rate on the air-conditioning side, are the supply water temperatures output from the ground source heat pump unit and input to the building respectively; is the power of the circulating pump on the air-conditioning side;

[0084] If it is identified that the ground source heat pump unit is in the cooling working condition at time t, then calculate the energy efficiency ratio of the ground source heat pump unit at time t , where is the circulating water flow rate on the ground source side, are the water temperatures returned from the underground heat exchanger to the ground source heat pump unit and the water temperature entering the ground source heat pump unit respectively; is the power of the ground source side circulation pump;

[0085] obtain the current energy efficiency ratio corresponding to the ground source heat pump unit , The specific value range is or .

[0086] It should be understood that in various embodiments of the present application, the magnitude of the sequence numbers of the above processes does not mean the sequence of execution. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0087] It should be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0088] As mentioned above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

[0089] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test system for the performance of a ground source heat pump unit, characterized in that: include: The four-dimensional temperature sensing network consists of four groups of high-precision temperature sensors, which are installed at the following locations: the ground source side inlet temperature sensor: installed at 1.5 times the pipe diameter downstream of the ground source side circulation pump outlet, to measure the soil heat exchange medium temperature entering the unit; the ground source side outlet temperature sensor: arranged at the ground source side heat exchanger outlet flange connection, to detect the medium temperature after the unit heat exchange; the air conditioning side inlet temperature sensor is installed at the user end return water pipe straight pipe section; the air conditioning side outlet temperature sensor is set at the air conditioning side circulation pump inlet, to monitor the water supply temperature output to the building; Dual-channel flow detection unit, including ultrasonic flowmeter on the ground source side and ultrasonic flowmeter on the air conditioner side; The data acquisition module is equipped with four PT1000 platinum resistance input channels, a dual-channel pulse counting unit and a power metering unit to collect the input power of the compressor and the circulation pump at time t in real time.

2. A ground source heat pump unit performance testing system according to claim 1, characterized in that: The system includes an energy efficiency calculation module that performs the following calculation steps: Collect the temperature T1 of the ground source side inlet temperature sensor at time t and the temperature T2 of the ground source side outlet temperature sensor at time t; When T1 is greater than T2, it is determined that the ground source heat pump unit is in heating condition at time t; When T1 is less than T2, it is determined that the ground source heat pump unit is in cooling condition at time t; Calculate the heat transfer of the ground source heat pump unit in heating condition at time t ; ρ is the water density, c is the constant pressure specific heat capacity of water, F2 is the measured value of the ultrasonic flow meter on the air conditioner side at time t; T4 and T3 respectively represent the measured values ​​of the outlet temperature sensor on the air conditioner side and the inlet temperature sensor on the air conditioner side at time t; At the same time, the heat transfer of the ground source heat pump unit in the cooling condition at time t is calculated ; F1 is the measured value of the ultrasonic flowmeter on the ground source side at time t.

3. A ground source heat pump unit performance testing system according to claim 2, characterized in that: The operation logic of the energy efficiency calculation module also includes: Get the heat transfer Q(t) of the ground source heat pump unit at time t, where Q(t) takes the value or ; The input power of the compressor and circulating pump at time t is collected and recorded as W1(t) and W2(t) respectively; Finally, the energy efficiency ratio of the ground source heat pump unit at time t is calculated .

4. A ground source heat pump unit performance testing system according to claim 1, characterized in that: The system includes a trend prediction module, including: Using the ARIMA time series model: Then predict the energy efficiency ratio of the ground source heat pump unit at time t+1 The calculation formula is ; In the above formula represents the pth autoregressive coefficient and the first autoregressive coefficient in the autoregressive model, COP(t) is the energy efficiency ratio of the ground source heat pump unit at time t, is the energy efficiency ratio of the ground source heat pump unit at time t-p+1; Represents the white noise sequence at time point t, which is the error term of the ARIMA time series model; Represents the sliding average coefficient of the white noise sequence at time points t-1 and tq.

5. A ground source heat pump unit performance testing system according to claim 1, characterized in that: The system includes a compressor frequency control module that performs the following calculation steps: When the energy efficiency gradient η of the monitored ground source heat pump unit is less than -0.05 / min, the analytical formula is used , the adjustment frequency value of the compressor corresponding to the ground source heat pump unit is obtained by analysis ; In the above formula Indicates the current frequency value of the compressor corresponding to the ground source heat pump unit; is the target value of the energy efficiency ratio of the ground source heat pump unit; Indicates the current energy efficiency ratio of the ground source heat pump unit. K is the system inertia coefficient, which is set within the empirical value range of 3-5. When η is greater than 0.1 / min, the following compensation algorithm is started: , the adjustment frequency value of the compressor corresponding to the ground source heat pump unit is obtained by analysis , They are the gain coefficients in the PID control algorithm respectively.

6. A ground source heat pump unit performance testing system according to claim 5, characterized in that: The energy efficiency gradient of the ground source heat pump unit is calculated as follows: ,in is the energy efficiency ratio of the ground source heat pump unit at time t-1, are the time points of time t and time t-1 respectively; η is the energy efficiency gradient of the ground source heat pump unit.

7. A ground source heat pump unit performance testing system according to claim 5, characterized in that: The calculation formula for the current energy efficiency ratio of the ground source heat pump unit is: If it is identified that the ground source heat pump unit is in heating condition at time t, then calculate the energy efficiency ratio of the ground source heat pump unit at time t ,in is the circulating water flow rate on the air conditioning side, They are the water supply temperatures output by the ground source heat pump unit and input to the building; is the circulating pump power on the air conditioning side; If it is identified that the ground source heat pump unit is in cooling condition at time t, then calculate the energy efficiency ratio of the ground source heat pump unit at time t ,in is the circulating water flow rate on the ground source side, They are the water temperature returning from the underground heat exchanger to the ground source heat pump unit and the water temperature entering the ground source heat pump unit; is the power of the circulating pump on the ground source side; Get the current energy efficiency ratio of the ground source heat pump unit , The specific value range is or .

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