Method, device and equipment for testing refrigerating capacity of water chiller and medium

Abstract

The invention discloses a method, device and equipment for testing the refrigerating capacity of a water chiller and a medium, and relates to the technical field of equipment testing.The method comprises the steps that a target test temperature under a target working condition is obtained; placing the to-be-detected equipment in a preset test environment, and obtaining a first change trend of the liquid outlet temperature when the liquid outlet temperature of the to-be-detected equipment is stabilized to the environment temperature; determining test heating efficiency output by the first test equipment according to the first change trend, adopting a heat balance method and utilizing the first test equipment to adjust the liquid outlet temperature to be close to the target detection temperature, and obtaining a second change trend of the liquid outlet temperature change process; and comparing the first change trend with the second change trend, and adjusting the liquid outlet temperature to be stabilized to the target detection temperature by using the first test equipment or the second test equipment according to a comparison result by adopting a heat balance method, so as to obtain a refrigerating capacity parameter detection result. According to the invention, the reliability and accuracy of the obtained detection result of the refrigerating capacity are improved, and the energy consumption in the testing process can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment testing, and in particular to a method, device, equipment and medium for testing the cooling capacity of a chiller. Background Art

[0002] With the continuous development of chiller products, users are becoming more and more aware of the quality of chiller products. Therefore, the various performance indicators of chillers are receiving more and more attention, especially the cooling capacity parameter, which is a crucial parameter of chillers. Therefore, it is particularly important to build an efficient and accurate chiller cooling capacity test system.

[0003] The current testing method for cooling capacity mainly uses the heat balance method. The heat balance method mainly uses a heat load such as an electric heater for auxiliary testing. The outlet temperature of the chiller is controlled by adjusting the power of the electric heater. The adjustment logic is: if the outlet temperature of the chiller is higher than the preset target temperature threshold, the heating power of the electric heater needs to be lowered, and vice versa, that is, the outlet temperature of the chiller is lower than the target temperature threshold, the heating power of the electric heater needs to be increased until the outlet temperature of the chiller stabilizes to the target temperature threshold. At this time, the power of the electric heater is the cooling capacity of the temperature point corresponding to this target temperature threshold.

[0004] However, during the actual test process, the cooling capacity parameters of the chiller need to be tested under a variety of different test conditions. The adjustment accuracy of the heat load is not easy to control for different test conditions, and there is a certain lag in the change of the chiller outlet temperature after the heat load adjusts the power. As a result, the current adjustment method cannot meet the test requirements of different test conditions.

[0005] Therefore, how to provide a test method for the cooling capacity of a chiller that can cope with different test conditions is an important issue that needs to be solved urgently in the industry. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide a method, device, equipment and medium for testing the cooling capacity of a chiller, thereby solving the problem that the testing accuracy of the cooling capacity of the chiller cannot meet the requirements of different test conditions.

[0007] According to a first aspect, an embodiment of the present invention provides a method for testing the cooling capacity of a chiller, the method comprising: Obtain target test temperature under target working conditions; The device to be tested is placed in a preset test environment, and a first change trend of the outlet liquid temperature of the device to be tested is obtained when the outlet liquid temperature stabilizes to the ambient temperature; Determine the test heating efficiency output by the first test device based on the first change trend, use the heat balance method and the first test device to adjust the outlet temperature to approach the target detection temperature, and obtain a second change trend of the outlet temperature change process; Comparing the first and second change trends to obtain a comparison result, using a heat balance method and the first test device or the second test device according to the comparison result, adjusting the liquid outlet temperature to stabilize at a target detection temperature, and obtaining a cooling capacity parameter detection result of the target working condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is smaller than the average value of the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

[0008] In conjunction with the first aspect, in a first embodiment of the first aspect, determining the test heating efficiency output by the first test device according to the first change trend, using a heat balance method and utilizing the first test device to adjust the outlet temperature to a temperature close to the target detection temperature, and obtaining a second change trend of the outlet temperature change process specifically includes: Selecting an electric heater as a heat load from the first test device according to the device rated power of the device to be tested; there is at least one electric heater as the heat load, and the sum of the heater rated powers of the electric heaters as the heat load exceeds the device rated power; The outlet temperature of the liquid of the device to be tested is adjusted by using a heat balance method and an electric heater as a heat load, so that the outlet temperature is adjusted to be close to the target detection temperature; A second change trend of the outlet liquid temperature change process of the device to be detected is obtained.

[0009] In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect, the method of using a heat balance method and an electric heater as a heat load to adjust the outlet temperature of the device to be detected to a temperature close to the target detection temperature specifically includes: Determining a numerical value and a difference between the ambient temperature and the target detection temperature, quantifying a target cooling capacity requirement based on the numerical value and the difference, and determining an initial operating power of an electric heater serving as a heat load in the first test device based on the target cooling capacity requirement; Obtaining a power output curve of the electric heater serving as a heat load in the first test device by fitting according to the first variation curve and the initial output power; Determine the actual working power and actual heating efficiency of each electric heater as a heat load at each time point based on the power output curve; the change value of the total actual working power of all electric heaters between adjacent time points is always equal, and the total actual heating efficiency of all electric heaters at adjacent time points is always equal; According to the actual working power and actual heating efficiency and using the heat balance method, the outlet liquid temperature of the device to be tested is adjusted to be close to the target detection temperature.

[0010] In combination with the first aspect, in a third embodiment of the first aspect, the comparing the first and second change trends to obtain a comparison result, using a heat balance method and using the first test device or the second test device based on the comparison result to adjust the liquid outlet temperature to stabilize at a target detection temperature, and obtaining a cooling capacity parameter detection result for the target operating condition, specifically includes: Identifying the temperature change inflection point in the first change trend; When it is determined that there is a temperature change inflection point, the temperature data before the temperature change inflection point is eliminated, and the degree of change of the second change trend is compared with the first change trend after elimination to obtain a comparison result; When it is determined that there is no temperature change inflection point, comparing the change degree of the second change trend with that of the first change trend to obtain a comparison result; When it is determined that the degree of change represented by the comparison result does not exceed the preset change range, the liquid outlet temperature is adjusted to be stable to the target detection temperature using the heat balance method and the first test equipment, and the cooling capacity parameter detection result of the target working condition is obtained; When it is determined that the degree of change represented by the comparison result exceeds the preset change range, the heat balance method is adopted and the second test equipment is used to adjust the liquid outlet temperature to stabilize to the target detection temperature to obtain the refrigeration capacity parameter detection result of the target working condition.

[0011] In combination with the first aspect, in a fourth implementation of the first aspect, the method further includes: Gather the cooling capacity parameter test results of all target working conditions and the factory parameters of the equipment to be tested, and generate a test report for the equipment to be tested.

[0012] In combination with the first aspect, in a fifth embodiment of the first aspect, placing the device to be tested under a preset test environment and obtaining a first change trend of the liquid outlet temperature when the liquid outlet temperature of the device to be tested stabilizes to the ambient temperature specifically includes: Build a preset test environment; Place the device to be tested in the preset test environment, and after confirming that the device to be tested is in a stable state, operate the device to be tested at the rated power of the device; Obtain a first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be detected stabilizes to the ambient temperature.

[0013] In combination with the first aspect, in a sixth embodiment of the first aspect, each of the electric heaters in the first test device and the second test device is determined by the following steps: determining heater rated power and heating efficiency of candidate electric heaters, determining a target heating efficiency based on a target test temperature of a target operating condition, and retaining candidate electric heaters having heating efficiencies exceeding the target heating efficiency; The retained candidate electric heaters are divided and grouped according to the heating efficiency and the preset grouping gradient, and the retained candidate electric heaters are divided into two groups to obtain the electric heaters corresponding to the first test device and the second test device respectively; the ratio of the maximum value of the heating efficiency of all electric heaters in the first test device to the minimum value of the heating efficiency of all electric heaters in the second test device exceeds the third threshold.

[0014] According to a second aspect, an embodiment of the present invention further provides a device for testing the cooling capacity of a chiller, the device comprising: A temperature determination module is used to obtain a target test temperature under a target working condition; A benchmark test module is used to place the device to be tested under a preset test environment and obtain a first change trend of the outlet liquid temperature of the device to be tested when the outlet liquid temperature stabilizes to the ambient temperature; A first testing module is configured to determine a test heating efficiency output by the first testing device based on the first variation trend, adjust the outlet temperature of the liquid to be close to a target detection temperature using a heat balance method and the first testing device, and obtain a second variation trend of the outlet temperature variation process; The second test module is used to compare the first and second change trends to obtain a comparison result, and adopt a heat balance method and, based on the comparison result, use the first test device or the second test device to adjust the liquid outlet temperature to stabilize at a target detection temperature, thereby obtaining a cooling capacity parameter detection result of the target operating condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is smaller than the average value of the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

[0015] According to the third aspect, an embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein when the processor executes the program, the steps of the method for testing the cooling capacity of a chiller as described in any one of the above are implemented.

[0016] According to a fourth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described methods for testing the cooling capacity of a chiller.

[0017] The method, device, equipment and medium for testing the cooling capacity of a chiller of the present invention first place the device to be tested under a preset test environment, obtain the first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be tested is stabilized to the ambient temperature, and then determine the test heating efficiency output by the first test device according to the first change trend. The heat balance method is adopted and the first test device is used to test the device to be tested, and the outlet liquid temperature is adjusted to a target detection temperature close to the target working condition. The second change trend of the outlet liquid temperature change process is obtained. According to the comparison result, the first test device and the second test device are switched, and the heating efficiency of the test device is switched to the cooling efficiency of the device to be tested. The rate is as consistent as possible to improve the detection accuracy, avoid the use of a single set of heat loads resulting in insufficient detection accuracy and avoid the long-term use of the same set of heat loads resulting in heat load failure and heating efficiency changes beyond expectations, thereby improving the reliability of the obtained cooling capacity detection results. At the same time, switching the specific test equipment used according to the actual situation of the equipment to be tested can also avoid the delay of the test progress caused by the failure of the test equipment. By setting up two test equipment to meet different test conditions, the accuracy of the obtained cooling capacity detection results is effectively improved. The actual working power and actual heating efficiency of the first and second equipment during actual operation are controllable, which can reduce the energy consumption required for the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings: Figure 1 A schematic flow chart showing a method for testing the cooling capacity of a chiller provided by the present invention is shown; Figure 2 A schematic diagram showing the structure of a test environment constructed in the method for testing the cooling capacity of a chiller provided by the present invention is shown; Figure 3 A schematic diagram showing the structure of a device for testing the cooling capacity of a chiller provided by the present invention is shown; Figure 4 This is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] With the continuous development of chiller products, users are becoming more and more aware of the quality of chiller products. Therefore, the various performance indicators of chillers are receiving more and more attention, especially the cooling capacity parameter, which is a crucial parameter of chillers. Therefore, it is particularly important to build an efficient and accurate chiller cooling capacity test system.

[0021] The heat balance method is currently the primary method for testing cooling capacity. The test environment for this method is relatively simple to set up, and its accuracy is relatively high. The heat balance method primarily relies on the assistance of a heat load, such as an electric heater, for auxiliary testing. Specifically, the test requires an electric heater with a power equal to the chiller's cooling capacity. The chiller and heater are connected via quick connectors. The chiller is then turned on and adjusted to the maximum cooling valve opening. When the above conditions are met, the electric heater is also turned on. The chiller's outlet temperature is controlled by adjusting the heater's power. The heat balance method operates as follows: if the chiller's outlet temperature is above the preset target temperature threshold, the electric heater's heating power is reduced. Conversely, if the chiller's outlet temperature is below the target temperature threshold, the electric heater's heating power is increased until the chiller's outlet temperature stabilizes at the target temperature threshold. At this point, the electric heater's power is the cooling capacity at the temperature point corresponding to this target temperature threshold.

[0022] However, during the actual test process, the cooling capacity parameters of the chiller need to be tested under a variety of different test conditions. The adjustment accuracy of the heat load is not easy to control for different test conditions, and there is a certain lag in the change of the chiller outlet temperature after the heat load adjusts the power. As a result, the current adjustment method cannot meet the test requirements of different test conditions.

[0023] In summary, how to provide a chiller cooling capacity testing method that can cope with different test conditions is an important issue that needs to be solved urgently in the industry.

[0024] In order to solve the above problems, a method for testing the cooling capacity of a water chiller is provided in this embodiment. The method for testing the cooling capacity of a water chiller in the embodiment of the present invention can be used in electronic devices, including but not limited to computers, mobile terminals, etc. Figure 1FIG. 1 is a flow chart of a method for testing the cooling capacity of a chiller according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps: S10. Obtaining a target test temperature under a target operating condition. It is understood that, in order to improve the accuracy of the cooling capacity test process for the equipment to be tested, multiple different target operating conditions can be set for the equipment to be tested during the test process. Each target operating condition represents a test condition and an industrial usage scenario, and each target operating condition has a corresponding target test temperature.

[0025] Typically, the target test temperatures under different target working conditions are inconsistent, in order to meet the testing requirements under different corresponding industrial usage scenarios.

[0026] S20 , placing the device to be tested under a preset test environment, and obtaining a first change trend of the outlet liquid temperature of the device to be tested when the outlet liquid temperature is stabilized to the ambient temperature.

[0027] In this embodiment, before testing the chilled water flow parameters of the device to be tested, i.e., the chiller to be tested, a preset test environment is first established for the device to be tested. The preset test environment includes a constant ambient temperature, a first test device, a second test device, a first temperature sensor, a second temperature sensor, a power regulator, and a host computer. To ensure stability during the test, the ambient temperature is kept constant. For example, if the device to be tested is placed in a constant temperature laboratory or other location for testing, the test temperature set in the laboratory or other location is the aforementioned ambient temperature.

[0028] like Figure 2 As shown, the first and second test devices are composed of a plurality of electric heaters. The electric heaters of the first test device are grouped as a first test heater group, and each electric heater in the first test heater group is assigned a corresponding device number, such as , Indicates the first test device Correspondingly, the electric heaters of the second test device will also be compiled into the second test heater group, and each electric heater in the second test heater group will be assigned a corresponding device number, such as , Indicates the second test device Each electric heater has a corresponding heater rated power (i.e., the rated power of the electric heater) and heating efficiency. The heater rated power and heating efficiency of each electric heater in the first and second test equipment are also different. Taking the first test equipment as an example, the first test equipment uses 4 different types of electric heaters (i.e., electric heaters , electric heater , electric heater and electric heater ), electric heater The rated power of the heater is 1.5kw, the electric heater The rated power of the heater is 3kw, the electric heater The rated power of the heater is 5kw, the electric heater The rated power of the heater is 12kw. These electric heaters have independent control switches and their corresponding heating efficiency.

[0029] The heating efficiency of each electric heater is determined by obtaining the heating time of each electric heater when heating a preset amount of water to the ambient temperature, and obtaining the heating efficiency of each electric heater according to the heating time.

[0030] In this embodiment, when selecting the electric heaters required for each test device, the electric heaters are grouped according to the rated power and heating efficiency of the electric heaters, thereby obtaining the first and second test devices.

[0031] It should be noted that the heating efficiencies of several electric heaters in the same or different test equipment can be close to the same, such as , electric heater , electric heater The heating efficiencies of these electric heaters may be almost the same.

[0032] Specifically, in order to meet the test requirements of different target working conditions, taking the first test device as an example, each electric heater in the first test device and the second test device is determined by the following steps: A10. Determine the heater rated power and heating efficiency of the candidate electric heaters, determine the target heating efficiency based on the target test temperature of the target operating condition, and retain the candidate electric heaters whose heating efficiency exceeds the target heating efficiency, that is, eliminate the candidate electric heaters whose heating efficiency is lower than the target heating efficiency.

[0033] In this embodiment, the candidate electric heaters include several electric heaters whose models, parameters, and other indicators have been determined in advance. The desired electric heater is then screened from the candidate electric heaters. The method for determining the heating efficiency of the candidate electric heaters is as described above and will not be repeated here.

[0034] It should be noted that, in the actual test process, since there may be several target working conditions, the impact of all target working conditions will be taken into consideration when determining the target heating efficiency, so as to obtain a target heating efficiency that is more capable of coping with all target working conditions used.

[0035] A20. Divide the retained candidate electric heaters into groups based on heating efficiency and a preset grouping gradient, and divide the retained candidate electric heaters into two groups to obtain electric heaters corresponding to the first test device and the second test device, respectively. The average heating efficiency of all electric heaters in the first test device is less than the average heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum heating efficiencies of all electric heaters in the first test device does not exceed a first threshold, the difference between the minimum and maximum heating efficiencies of all electric heaters in the second test device does not exceed a second threshold, and the ratio of the maximum heating efficiency of all electric heaters in the first test device to the minimum heating efficiency of all electric heaters in the second test device exceeds a third threshold.

[0036] It can be seen that the overall heating efficiency of the first test device is not as good as that of the second test device. The purpose of this setting is to adapt to different cooling requirements and cooling accuracy. Specifically, the first test device can be used when the target working condition has relatively low requirements for cooling demand and cooling accuracy. The first test device is also the benchmark test device for subsequent tests. The second test device will select electric heaters with better heating efficiency. Therefore, the second test device can be used when the target working condition has relatively higher requirements for cooling demand and cooling accuracy. Correspondingly, the second test device also has higher sensitivity requirements for adjusting the cooling capacity of the device to be tested. The settings of the first and second test devices can meet the test requirements of different target working conditions and improve test efficiency and test accuracy.

[0037] When grouping candidate electric heaters, to meet the testing requirements of chillers of different manufacturers and models, the difference between the maximum and minimum heating efficiencies of the electric heaters in either the first or second test device is controlled within a certain range (e.g., a first threshold and a second threshold). This facilitates smoother and more precise unilateral control of the heat output efficiency on the heat load side when testing the cooling capacity parameters of the device under test using the heat balance method. Thus, the heat output efficiency on the heat load side, i.e., the heat source side, can be quantified and properly controlled using the first and second test devices, which have similar heating efficiencies.

[0038] Among them, the ratio of the maximum value of the heating efficiency of all electric heaters in the first test device to the minimum value of the heating efficiency of all electric heaters in the second test device exceeds a third threshold value (for example, 90%), that is, the critical boundaries of the maximum value and the minimum value of the heating efficiency of the electric heaters in the two test devices are relatively close, which can reduce the error in parameter identification when it comes to switching the core heating device of the heat load (that is, when the first test device is switched to the second test device), and reduce the impact of the switching of the electric heaters on the determination of the cooling capacity parameters.

[0039] Preferably, a third test device can also be set up, the average value of the heating efficiency of all the electric heaters in the third test device is less than the heating efficiency of all the electric heaters in the first test device, the difference between the minimum and maximum values ​​of the heating efficiency of all the electric heaters in the third test device does not exceed the fourth threshold value, and the ratio of the maximum value of the heating efficiency of all the electric heaters in the third test device to the minimum value of the heating efficiency of all the electric heaters in the first test device exceeds the fifth threshold value. The functions of the fourth and fifth threshold settings are as described above and will not be elaborated here. The third test device can be applicable to some special industrial usage scenarios, such as scenarios that are relatively insensitive to refrigeration needs and refrigeration accuracy. Since the heating efficiency of each electric heater is relatively low, the third test device can also be used as a device for debugging various parameters of the equipment to be tested.

[0040] In this embodiment, the strategy of presetting the grouping gradient is as follows: 1. The heater rated powers of the electric heaters in each test device are different and present a gradient distribution, so as to cover the test requirements of the equipment to be tested of various manufacturers and models; 2. By combining the heater rated powers of at least two electric heaters in each test device, the heater rated power obtained by the combination can be made not lower than the equipment rated power of the equipment to be tested (i.e., the rated power of the equipment to be tested). For example, if the equipment rated power of the equipment to be tested is 15 kW, the first test device finally selects 4 electric heaters of different models. The rated power of the heater is 1kw, the electric heater The rated power of the heater is 3kw, the electric heater The rated power of the heater is 5kw, the electric heater The heater is rated at 12kw, through the combination of electric heater and electric heater The rated power of the combined heater can be 17kw, which exceeds the rated power of the equipment; the rated power of the equipment to be tested is 1kw, so any electric heater in the first test equipment can be used as a heat source for the test.

[0041] If the cooling capacity of the equipment to be tested is greater than the rated power of the test equipment, the test of the cooling capacity parameters based on the thermal balance method will be completely inaccurate. Therefore, the first and second test equipment obtained based on the above method can avoid this situation, avoid the waste of thermal energy resources during the test process, and avoid obtaining completely unusable test results.

[0042] After building the first and second test equipment, continue to build other test instruments, including: Temperature sensing module: It is respectively set at the liquid outlet of the device to be detected and the output port of the heat load. For example, it is made into an L-shaped stainless steel tube. A hole with a length and diameter suitable for accommodating the temperature sensor is reserved inside the L-shaped stainless steel tube. The stainless steel tube wall is thin enough to make the stainless steel tube have sufficient thermal conductivity. For example, for the first temperature sensor set at the liquid outlet of the device to be detected, Figure 2 The temperature sensor 1 in the figure needs to transmit the outlet temperature to the temperature sensor, so the design requires a high accuracy of ±0.1℃. The first temperature sensor is inserted into the hole. This temperature sensor is detachable and easy to replace and maintain. The installation direction of the first temperature sensor requires that the long end of the L-shaped stainless steel tube be connected to the outlet of the device to be tested. The outlet direction is opposite to the insertion direction of the first temperature sensor. The second temperature sensor configured at the output port of the heat load is Figure 2 The installation process of temperature sensor 2 is similar. The temperature sensing module will also be equipped with a data collector, which is mainly used to collect temperature data obtained by the two temperature sensors and upload it to the host computer; Power Regulator: It is mainly used to automatically adjust the actual working power and actual heating efficiency of each electric heater used in the final test, and transmit the data to the host computer. The actual heating efficiency is increased or decreased according to the real-time feedback of the outlet temperature data from the host computer to achieve the effect of thermal balance. Host computer: It integrates the data fed back by various temperature sensors and can set relevant data to achieve the purpose of testing. It can make corresponding adjustments based on the real-time temperature of the output port of the liquid outlet and the heat load.

[0043] Preferably, corresponding control valves can be set in the pipelines connecting the above-mentioned devices, such as the first control valve and the second control valve. Figure 2 Control valve 1 and control valve 2 in.

[0044] S30. Determine the test heating efficiency output by the first test device based on the first change trend, adopt a heat balance method and use the first test device to test the device to be tested, adjust the outlet liquid temperature to be close to the target detection temperature, and obtain a second change trend of the outlet liquid temperature change process.

[0045] In this embodiment, approaching the target detection temperature means that the liquid outlet temperature gradually changes from the ambient temperature to the target detection temperature, that is, the difference between the liquid outlet temperature and the target detection temperature becomes smaller and smaller and the difference between the two is greater than the preset difference. Approaching the target detection temperature is different from stabilizing to the target detection temperature. Approaching the target detection temperature means that the above-mentioned difference always exists.

[0046] In step S20 and step S30 , based on the adjustment principle of the thermal balance method, the device to be tested will continue to operate at the rated power of the device after stabilization.

[0047] S40, comparing the first and second change trends to obtain a comparison result, using a heat balance method and using the first test device or the second test device according to the comparison result to adjust the liquid outlet temperature to stabilize at a target detection temperature, and obtain a cooling capacity parameter detection result of the target working condition.

[0048] In this embodiment, stabilizing to the ambient temperature or the target detection temperature means that the outlet liquid temperature of the equipment to be tested is equal to or close to the ambient temperature or the target detection temperature within a preset time period, and is within the error range set for the ambient temperature or the target detection temperature (the error range can be specifically set according to the parameters set to be tested). At this time, it means that the outlet liquid temperature has reached a stable state at a certain temperature point. In particular, after the outlet liquid temperature stabilizes to the target detection temperature, the test data can be exported to generate a report to obtain the cooling capacity parameter test results. After the refrigeration capacity parameter retrieval results of the device to be tested under one target working condition are tested, steps S10 to S40 can be executed in sequence to obtain refrigeration capacity parameter test results of the device to be tested under other target working conditions.

[0049] For different devices to be tested, there may be a temperature change inflection point in the first change trend. In this embodiment, the temperature change inflection point refers to the temperature value before and after a certain data point changing by more than the preset change value. This is due to interference components caused by parameters such as the cooling accuracy of the device to be tested. During the comparison process, we will first identify whether there is a temperature change inflection point in the first change trend. If so, the interference components caused by the temperature change inflection point will be eliminated. Then, it will be compared with the second change area to determine the degree of change of the second change trend relative to the first change trend, and then obtain the comparison result. Then, based on the comparison result, the appropriate test equipment will be selected. If the degree of change is within the preset change range, the first test equipment will still be used. If the degree of change exceeds the preset change range, the second test equipment will be switched to pursue higher detection accuracy. That is, according to the comparison results, the first test device and the second test device will be switched. The purpose is to switch the heating efficiency of the test device to be as consistent as possible with the cooling efficiency of the device to be tested, so as to improve the detection accuracy, avoid the use of a single set of heat loads resulting in insufficient detection accuracy, and avoid long-term use of the same set of heat loads resulting in heat load failure and heating efficiency changes beyond expectations, thereby improving the reliability of the obtained cooling capacity test results. At the same time, switching the specific test equipment used according to the actual situation of the device to be tested can also avoid delays in the test progress caused by failures of the test equipment.

[0050] Since the average heating efficiency of all electric heaters in the first test device is lower than the heating efficiency of all electric heaters in the second test device, by setting up two test devices, different test conditions can be met, thereby effectively improving the accuracy of the obtained cooling capacity detection results. The actual working power and actual heating efficiency of the first and second devices during actual operation are controllable, which can reduce the energy consumption required for the testing process.

[0051] The method for testing the cooling capacity of a chiller of the present invention first places the device to be tested under a preset test environment, obtains a first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be tested is stabilized to the ambient temperature, and then determines the test heating efficiency output by the first test device based on the first change trend. The device to be tested is tested using the heat balance method and the first test device, and the outlet liquid temperature is adjusted to a target detection temperature close to the target working condition. The second change trend of the outlet liquid temperature change process is obtained. According to the comparison result, the first test device and the second test device are switched, and the heating efficiency of the test device is switched to a temperature as close as possible to the cooling efficiency of the device to be tested. Consistency can improve the detection accuracy, avoid the use of a single set of heat loads resulting in insufficient detection accuracy and long-term use of the same set of heat loads resulting in heat load failure and heating efficiency changes beyond expectations, thereby improving the reliability of the obtained cooling capacity detection results. At the same time, switching the specific test equipment used according to the actual situation of the equipment to be tested can also avoid delays in the test progress caused by failures of the test equipment. By setting up two test equipment to meet different test conditions, the accuracy of the obtained cooling capacity detection results is effectively improved. The actual working power and actual heating efficiency of the first and second devices during actual operation are controllable, which can reduce the energy consumption required for the test process.

[0052] In this embodiment, step S20 specifically includes: S21. Build a preset test environment to create a good and stable test environment for the device to be tested. The specific construction process is as described above and will not be repeated here.

[0053] S22. Place the device to be tested in a preset test environment, and when it is determined that the device to be tested is in a stable state, operate the device to be tested at the rated power of the device.

[0054] In this embodiment, the stable state includes the stability of the installation position of the device to be tested to ensure the stable operation of the device, the absence of hardware and software equipment failures in the device to be tested, the correct operation and parameter settings of the device to be tested during startup and subsequent operation, etc.

[0055] S23. Obtain a first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be detected stabilizes to the ambient temperature.

[0056] Step S20 is a benchmark test for the chiller equipment, which can be applied to all equipment to be tested. The benchmark test is used to determine the first change trend. Specifically, the temperature change curve can be constructed by recording parameters such as time and liquid outlet temperature, and then the first change trend of the liquid outlet temperature can be obtained by analyzing the temperature change curve.

[0057] In this embodiment, step S30 specifically includes: S31. Select an electric heater from the first test device as a heat load based on the device rated power of the device to be tested. The sum of the heater rated powers of these electric heaters exceeds the device rated power. Alternatively, only one electric heater from the first test device may be selected, and the heater rated power of the heater must also exceed the device rated power.

[0058] The electric heater is used as a heat source to balance the equipment to be tested. After selecting the corresponding electric heater, one end of the electric heater needs to be electrically connected to the power regulator. The power regulator is used to adjust the actual working power and actual heating efficiency of each electric heater during actual operation. The power regulator is also electrically connected to the host computer. The tester can use the host computer to send real-time control instructions to the power regulator. After receiving the control instructions, the power regulator generates specific control parameters for the electric heater to adjust the actual working power and actual heating efficiency.

[0059] Preferably, a power meter can be set in the connection path between the host computer and the power regulator, and the power meter can be arranged in a constant temperature laboratory or other place, so that the test personnel can observe and understand the specific actual working power and actual heating efficiency values ​​at the test site. The power meter can also be responsible for detecting and recording the output power of the power regulator, that is, the cooling capacity data required for testing.

[0060] S32. Using a heat balance method and an electric heater as a heat load, the outlet temperature of the device to be detected is adjusted to be close to the target detection temperature.

[0061] It is understandable that, based on the adjustment principle of the thermal balance method, the device to be tested will still operate at the rated power of the device during the adjustment process.

[0062] The logic of adjusting the liquid outlet temperature is still based on the existing method, that is, according to the difference between the liquid outlet temperature and the target detection temperature, the actual working power output of all electric heaters selected on the first heating device side is increased or decreased accordingly.

[0063] More specifically, step S32 includes: S321. Determine the numerical value and difference between the ambient temperature and the target detection temperature, quantify the target cooling capacity requirement based on the numerical value and the difference, and determine the initial operating power of the electric heater as a heat load in the first test device based on the target cooling capacity requirement.

[0064] In this embodiment, the larger of the two temperature values, the ambient temperature and the target detection temperature, is first determined. If the ambient temperature is relatively higher, it indicates that the cooling capacity requirement of the target operating condition is larger. Conversely, if the ambient temperature is relatively lower, it indicates that the cooling capacity requirement of the target operating condition is smaller. Based on the numerical values ​​and the specific difference between the two temperature values, whether the cooling capacity requirement is smaller or larger, the cooling capacity requirement can be quantified by obtaining the difference between the numerical values, thereby obtaining the target cooling capacity requirement of the target operating condition. The target cooling capacity requirement can be a positive or negative value. It is understood that different target operating conditions can correspond to different target cooling capacity requirements.

[0065] The initial operating power is obtained by increasing or decreasing the rated power of the equipment. When the ambient temperature is higher than the target detection temperature, the initial operating power can be set to exceed the rated power of the equipment. The specific value of the excess is determined according to the quantified target cooling capacity demand curve. Similarly, when the ambient temperature is lower than the target detection temperature, the initial operating power can be set to be lower than the rated power of the equipment, that is, the rated power of the equipment minus a certain value. The specific value of the subtraction is determined according to the quantified target cooling capacity demand curve.

[0066] It should be noted that there are special cases where the quantified target cooling capacity demand is 0. In this case, the initial operating power is the rated power of the equipment. At the same time, the maximum value of the initial operating power is the total heater rated power of the electric heater as the heat load.

[0067] S322 : Obtain a power output curve of the electric heater serving as a heat load in the first test device according to the first variation curve and the initial output power.

[0068] In this embodiment, the power output curve needs to fit the first variation curve, and the initial operating power provides the coordinate value of the initial point in the power output curve.

[0069] S323 : Determine the actual working power and actual heating efficiency of each electric heater serving as a heat load at each time point according to the power output curve.

[0070] To reduce the impact of hysteresis in the outlet liquid temperature, in this embodiment, the power output curve is fitted to ensure that the change in the total actual operating power of all electric heaters between adjacent time points is always equal, and the total actual heating efficiency of all electric heaters at adjacent time points is always equal. This ensures a stable output on one side of the heat load when the actual operating power and actual heating efficiency are obtained from the power output curve.

[0071] S324. According to the actual working power and actual heating efficiency and by using the heat balance method, the outlet temperature of the device to be tested is adjusted to be close to the target detection temperature.

[0072] S33. Obtain a second change trend of the outlet liquid temperature change process of the device to be detected.

[0073] Similarly, a temperature change curve can be constructed by recording parameters such as time and liquid outlet temperature, and then a second change trend of the liquid outlet temperature can be obtained by analyzing the temperature change curve.

[0074] In this embodiment, step S40 specifically includes: S41 . Identify a temperature change inflection point in the first change trend. In this embodiment, a time-temperature change curve may be drawn, and whether a temperature change inflection point exists may be identified based on the curve.

[0075] S42. When it is determined that there is a temperature change inflection point, the temperature data before the temperature change inflection point is eliminated, and the degree of change of the second change trend is compared with the first change trend after elimination to obtain a comparison result.

[0076] S43. When it is determined that there is no temperature change inflection point, compare the change degree of the second change trend with that of the first change trend to obtain a comparison result.

[0077] In this embodiment, how to obtain the comparison result is determined based on whether there is a temperature change inflection point.

[0078] S44. When it is determined that the degree of change represented by the comparison result does not exceed the preset change range, the liquid outlet temperature is adjusted to be stable to the target detection temperature using the heat balance method and the first test equipment to obtain the cooling capacity parameter detection result of the target working condition.

[0079] When it is determined that the first test device is still used for testing, the actual working power and actual heating efficiency obtained previously can still be used, and the goal is still to adjust the liquid outlet temperature to stabilize at the target detection temperature.

[0080] S45. When it is determined that the degree of change represented by the comparison result exceeds the preset change range, the liquid outlet temperature is adjusted to stabilize to the target detection temperature using the heat balance method and the second test equipment to obtain the cooling capacity parameter detection result of the target working condition.

[0081] When it is determined that it is necessary to switch to the second test device for testing, it is necessary to select an electric heater as a heat load from the second test device based on the rated power of the device to be tested. The determination method can be found in step S31 and will not be described in detail here. Afterwards, it is necessary to determine the parameters of the first adjustment interval of the second test device based on the data before the temperature change inflection point in the first change trend. These data reflect the lag time when the device to be tested is cooled. The first interval length of the first adjustment interval and the first duration of the first adjustment interval are determined based on the lag time. For example, the first interval length of the first adjustment interval is 2s, and the first duration is 20s. The longer the lag time, the longer the corresponding first interval length and first duration can be set. The shorter the lag time, the more sensitive the control needs to be, so the first interval length and first duration can also be set shorter.

[0082] The initial working power of the electric heater serving as a heat load in the second test device can be consistent with the initial working power of the electric heater serving as a heat load in the second test device. After undergoing the first adjustment interval test, the second test device will perform a test at the second adjustment interval. The second test interval is the adjustment method for the actual working power and actual heating efficiency of each electric heater at each time node during the test of the first test device. The difference between the second test interval and the first test interval is that the second interval duration corresponding to the second test interval is greater than the first interval duration of the second test interval.

[0083] Specifically, the first test device adjusts the actual operating power and actual heating efficiency of each electric heater as a heat load at each first adjustment interval, either increasing or decreasing the values, depending on the target cooling demand. The second test device adjusts the actual operating power and actual heating efficiency of each electric heater as a heat load at each first or second adjustment interval, either increasing or decreasing the values, depending on the target cooling demand. Because the electric heaters in the second test device have superior heating efficiency, they maintain excellent adjustment sensitivity even with shorter adjustment intervals.

[0084] For scenarios requiring testing under multiple target operating conditions, the cooling capacity parameter test results are derived by combining the first trend and the total actual operating power of the electric heater at the target test temperature. Furthermore, the cooling capacity parameter test results for all target operating conditions, along with the factory parameters of the device under test, can be compiled to generate a test report for the device under test, providing an understanding of whether the device meets actual usage requirements.

[0085] It is understandable that the cooling capacity parameter test results of several target working conditions in actual use and the factory parameters of the equipment to be tested can also be collected to generate a test report for the equipment to be tested.

[0086] The following describes a device for testing the cooling capacity of a chiller provided in an embodiment of the present invention. The device for testing the cooling capacity of a chiller described below and the method for testing the cooling capacity of a chiller described above can be referenced to each other.

[0087] In order to solve the above problems, a test device for the cooling capacity of a chiller is provided in this embodiment, which aims to generate detection frames of continuous frames, greatly reduce the workload of manual labeling, and improve the accuracy of the frame center point and size information. Figure 3 FIG. 1 is a schematic diagram of a method for testing the cooling capacity of a chiller according to an embodiment of the present invention. Figure 3 As shown, the device may include: Temperature determination module 10 is configured to obtain a target test temperature under a target operating condition. It is understood that, to improve the accuracy of the cooling capacity test process for the equipment under test, multiple different target operating conditions can be set for the equipment under test during the test process. Each target operating condition represents a test condition and an industrial usage scenario, and each target operating condition has a corresponding target test temperature.

[0088] Typically, the target test temperatures under different target working conditions are inconsistent, in order to meet the testing requirements under different corresponding industrial usage scenarios.

[0089] The benchmark test module 20 is used to place the device to be tested under a preset test environment and obtain a first change trend of the outlet liquid temperature of the device to be tested when the outlet liquid temperature is stabilized to the ambient temperature.

[0090] In this embodiment, before testing the chilled water flow parameters of the device to be tested, i.e., the chiller to be tested, a preset test environment is first established for the device to be tested. The preset test environment includes a constant ambient temperature, a first test device, a second test device, a first temperature sensor, a second temperature sensor, a power regulator, and a host computer. To ensure stability during the test, the ambient temperature is kept constant. For example, if the device to be tested is placed in a constant temperature laboratory or other location for testing, the test temperature set in the laboratory or other location is the aforementioned ambient temperature.

[0091] The first and second test devices are composed of a plurality of electric heaters. The electric heaters of the first test device are grouped as a first test heater group, and each electric heater in the first test heater group is assigned a corresponding device number, such as , Indicates the first test device Correspondingly, the electric heaters of the second test device will also be compiled into the second test heater group, and each electric heater in the second test heater group will be assigned a corresponding device number, such as , Indicates the second test device Each electric heater has a corresponding rated power and heating efficiency. The rated power and heating efficiency of each electric heater in the first and second test equipment are also different. Taking the first test equipment as an example, the first test equipment uses 4 different types of electric heaters (electric heaters , electric heater , electric heater and electric heater ), electric heater The rated power of the heater is 1kw, the electric heater The rated power of the heater is 3kw, the electric heater The rated power of the heater is 5kw, the electric heater The rated power of the heater is 12kw. These electric heaters have independent control switches and their corresponding heating efficiency.

[0092] The heating efficiency of each electric heater is determined by obtaining the heating time of each electric heater when heating a preset amount of water to the ambient temperature, and obtaining the heating efficiency of each electric heater according to the heating time.

[0093] In this embodiment, when selecting the electric heaters required for each test device, the electric heaters are grouped according to the rated power and heating efficiency of the electric heaters, thereby obtaining the first and second test devices.

[0094] It should be noted that the heating efficiencies of several electric heaters in the same or different test equipment can be close to the same, such as , electric heater , electric heater The heating efficiencies of these electric heaters may be almost the same.

[0095] The first test module 30 is used to determine the test heating efficiency output by the first test device according to the first change trend, adopt the heat balance method and use the first test device to test the device to be tested, adjust the outlet liquid temperature to be close to the target detection temperature, and obtain the second change trend of the outlet liquid temperature change process.

[0096] In this embodiment, approaching the target detection temperature means that the liquid outlet temperature gradually changes from the ambient temperature to the target detection temperature, that is, the difference between the liquid outlet temperature and the target detection temperature becomes smaller and smaller and the difference between the two is greater than the preset difference. Approaching the target detection temperature is different from stabilizing to the target detection temperature. Approaching the target detection temperature means that the above-mentioned difference always exists.

[0097] Based on the adjustment principle of the thermal balance method, the device to be tested will continue to operate at the rated power of the device after stabilization.

[0098] The second test module 40 is used to compare the first and second change trends to obtain a comparison result, and adopts a heat balance method and uses the first test device or the second test device according to the comparison result to adjust the liquid outlet temperature to stabilize to the target detection temperature, thereby obtaining a refrigeration capacity parameter detection result of the target working condition.

[0099] In this embodiment, stabilizing to the ambient temperature or the target detection temperature means that the outlet liquid temperature of the equipment to be tested is equal to or close to the ambient temperature or the target detection temperature within a preset time period, and is within the error range set for the ambient temperature or the target detection temperature (the error range can be specifically set according to the parameters set to be tested). At this time, it means that the outlet liquid temperature has reached a stable state at a certain temperature point. In particular, after the outlet liquid temperature stabilizes to the target detection temperature, the test data can be exported to generate a report to obtain the cooling capacity parameter test results. For different devices to be tested, there may be a temperature change inflection point in the first change trend. In this embodiment, the temperature change inflection point refers to the temperature value before and after a certain data point changing by more than the preset change value. This is due to interference components caused by parameters such as the cooling accuracy of the device to be tested. During the comparison process, we will first identify whether there is a temperature change inflection point in the first change trend. If so, the interference components caused by the temperature change inflection point will be eliminated. Then, it will be compared with the second change area to determine the degree of change of the second change trend relative to the first change trend, and then obtain the comparison result. Then, based on the comparison result, the appropriate test equipment will be selected. If the degree of change is within the preset change range, the first test equipment will still be used. If the degree of change exceeds the preset change range, the second test equipment will be switched to pursue higher detection accuracy. That is, according to the comparison results, the first test device and the second test device will be switched. The purpose is to switch the heating efficiency of the test device to be as consistent as possible with the cooling efficiency of the device to be tested, so as to improve the detection accuracy, avoid the use of a single set of heat loads resulting in insufficient detection accuracy, and avoid long-term use of the same set of heat loads resulting in heat load failure and heating efficiency changes beyond expectations, thereby improving the reliability of the obtained cooling capacity test results. At the same time, switching the specific test equipment used according to the actual situation of the device to be tested can also avoid delays in the test progress caused by failures of the test equipment.

[0100] Since the average heating efficiency of all electric heaters in the first test device is lower than the heating efficiency of all electric heaters in the second test device, by setting up two test devices, different test conditions can be met, thereby effectively improving the accuracy of the obtained cooling capacity detection results. The actual working power and actual heating efficiency of the first and second devices during actual operation are controllable, which can reduce the energy consumption required for the testing process.

[0101] The test device for the refrigeration capacity of a chiller of the present invention first places the device to be tested under a preset test environment, obtains a first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be tested is stabilized to the ambient temperature, and then determines the test heating efficiency output by the first test device based on the first change trend. The device to be tested is tested using the heat balance method and the first test device, and the outlet liquid temperature is adjusted to a target detection temperature close to the target working condition. The second change trend of the outlet liquid temperature change process is obtained. According to the comparison result, the first test device and the second test device are switched, and the heating efficiency of the test device is switched to a temperature as close as possible to the refrigeration efficiency of the device to be tested. Consistency can improve the detection accuracy, avoid the use of a single set of heat loads resulting in insufficient detection accuracy and long-term use of the same set of heat loads resulting in heat load failure and heating efficiency changes beyond expectations, thereby improving the reliability of the obtained cooling capacity detection results. At the same time, switching the specific test equipment used according to the actual situation of the equipment to be tested can also avoid delays in the test progress caused by failures of the test equipment. By setting up two test equipment to meet different test conditions, the accuracy of the obtained cooling capacity detection results is effectively improved. The actual working power and actual heating efficiency of the first and second devices during actual operation are controllable, which can reduce the energy consumption required for the test process.

[0102] Figure 4 An example of a physical structure diagram of an electronic device is shown below. Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other via the communication bus 440. The processor 410 may call the logic commands in the memory 430 to execute a method for testing the cooling capacity of the chiller, which method includes: Obtain target test temperature under target working conditions; The device to be tested is placed in a preset test environment, and a first change trend of the outlet liquid temperature of the device to be tested is obtained when the outlet liquid temperature stabilizes to the ambient temperature; Determine the test heating efficiency output by the first test device based on the first change trend, use the heat balance method and the first test device to adjust the outlet temperature to approach the target detection temperature, and obtain a second change trend of the outlet temperature change process; Comparing the first and second change trends to obtain a comparison result, using a heat balance method and the first test device or the second test device according to the comparison result, adjusting the liquid outlet temperature to stabilize at a target detection temperature, and obtaining a cooling capacity parameter detection result of the target working condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is less than the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

[0103] In addition, the logic instructions in the aforementioned memory 430 can be implemented in the form of a software functional unit and, when sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0104] On the other hand, the present invention further provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions. When the program instructions are executed by a computer, the computer is capable of performing the chiller cooling capacity testing method provided by the above methods, the method comprising: Obtain target test temperature under target working conditions; The device to be tested is placed in a preset test environment, and a first change trend of the outlet liquid temperature of the device to be tested is obtained when the outlet liquid temperature stabilizes to the ambient temperature; Determine the test heating efficiency output by the first test device based on the first change trend, use the heat balance method and the first test device to adjust the outlet temperature to approach the target detection temperature, and obtain a second change trend of the outlet temperature change process; Comparing the first and second change trends to obtain a comparison result, using a heat balance method and the first test device or the second test device according to the comparison result, adjusting the liquid outlet temperature to stabilize at a target detection temperature, and obtaining a cooling capacity parameter detection result of the target working condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is less than the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

[0105] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the above-mentioned method for testing the cooling capacity of a chiller, the method comprising: Obtain target test temperature under target working conditions; The device to be tested is placed in a preset test environment, and a first change trend of the outlet liquid temperature of the device to be tested is obtained when the outlet liquid temperature stabilizes to the ambient temperature; Determine the test heating efficiency output by the first test device based on the first change trend, use the heat balance method and the first test device to adjust the outlet temperature to approach the target detection temperature, and obtain a second change trend of the outlet temperature change process; Comparing the first and second change trends to obtain a comparison result, using a heat balance method and the first test device or the second test device according to the comparison result, adjusting the liquid outlet temperature to stabilize at a target detection temperature, and obtaining a cooling capacity parameter detection result of the target working condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is less than the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for testing the cooling capacity of a chiller, characterized in that: The method comprises: Obtain target test temperature under target working conditions; The device to be tested is placed in a preset test environment, and a first change trend of the outlet liquid temperature of the device to be tested is obtained when the outlet liquid temperature stabilizes to the ambient temperature; Determine the test heating efficiency output by the first test device based on the first change trend, use the heat balance method and the first test device to adjust the outlet temperature to approach the target detection temperature, and obtain a second change trend of the outlet temperature change process; Comparing the first and second change trends to obtain a comparison result, using a heat balance method and the first test device or the second test device according to the comparison result, adjusting the liquid outlet temperature to stabilize at a target detection temperature, and obtaining a cooling capacity parameter detection result of the target working condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is smaller than the average value of the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

2. The method for testing the cooling capacity of a chiller according to claim 1, characterized in that: The method of determining the test heating efficiency output by the first test device according to the first change trend, adjusting the outlet temperature of the liquid to be close to the target detection temperature using the first test device using a heat balance method, and obtaining a second change trend of the outlet temperature change process specifically includes: Selecting an electric heater as a heat load from the first test device according to the device rated power of the device to be tested; there is at least one electric heater as the heat load, and the sum of the heater rated powers of the electric heaters as the heat load exceeds the device rated power; The outlet temperature of the liquid of the device to be tested is adjusted by using a heat balance method and an electric heater as a heat load, so that the outlet temperature is adjusted to be close to the target detection temperature; A second change trend of the outlet liquid temperature change process of the device to be detected is obtained.

3. The method for testing the cooling capacity of a chiller according to claim 2, wherein: The method of using the heat balance method and an electric heater as a heat load to adjust the outlet temperature of the device to be detected to a temperature close to the target detection temperature specifically includes: Determining a numerical value and a difference between the ambient temperature and the target detection temperature, quantifying a target cooling capacity requirement based on the numerical value and the difference, and determining an initial operating power of an electric heater serving as a heat load in the first test device based on the target cooling capacity requirement; Obtaining a power output curve of the electric heater serving as a heat load in the first test device by fitting according to the first variation curve and the initial output power; Determine the actual working power and actual heating efficiency of each electric heater as a heat load at each time point based on the power output curve; the change value of the total actual working power of all electric heaters between adjacent time points is always equal, and the total actual heating efficiency of all electric heaters at adjacent time points is always equal; According to the actual working power and actual heating efficiency and using the heat balance method, the outlet liquid temperature of the device to be tested is adjusted to be close to the target detection temperature.

4. The method for testing the cooling capacity of a chiller according to claim 1, wherein: The first and second change trends are compared to obtain a comparison result, and the liquid outlet temperature is adjusted to be stable to a target detection temperature using the first test device or the second test device according to the comparison result using a heat balance method to obtain a cooling capacity parameter detection result of a target working condition, specifically including: Identifying the temperature change inflection point in the first change trend; When it is determined that there is a temperature change inflection point, the temperature data before the temperature change inflection point is eliminated, and the degree of change of the second change trend is compared with the first change trend after elimination to obtain a comparison result; When it is determined that there is no temperature change inflection point, comparing the change degree of the second change trend with that of the first change trend to obtain a comparison result; When it is determined that the degree of change represented by the comparison result does not exceed the preset change range, the liquid outlet temperature is adjusted to be stable to the target detection temperature using the heat balance method and the first test equipment, and the cooling capacity parameter detection result of the target working condition is obtained; When it is determined that the degree of change represented by the comparison result exceeds the preset change range, the heat balance method is adopted and the second test equipment is used to adjust the liquid outlet temperature to stabilize to the target detection temperature to obtain the refrigeration capacity parameter detection result of the target working condition.

5. The method for testing the cooling capacity of a chiller according to claim 1, wherein: The method further comprises: Gather the cooling capacity parameter test results of all target working conditions and the factory parameters of the equipment to be tested, and generate a test report for the equipment to be tested.

6. The method for testing the cooling capacity of a chiller according to claim 1, wherein: Placing the device to be tested under a preset test environment and obtaining a first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be tested stabilizes to the ambient temperature specifically includes: Build a preset test environment; Place the device to be tested in the preset test environment, and after confirming that the device to be tested is in a stable state, operate the device to be tested at the rated power of the device; Obtain a first change trend of the outlet liquid temperature when the outlet liquid temperature of the device to be detected stabilizes to the ambient temperature.

7. The method for testing the cooling capacity of a chiller according to claim 1, wherein: Each of the electric heaters in the first test device and the second test device is determined by the following steps: determining heater rated power and heating efficiency of candidate electric heaters, determining a target heating efficiency based on a target test temperature of a target operating condition, and retaining candidate electric heaters having heating efficiencies exceeding the target heating efficiency; The retained candidate electric heaters are divided and grouped according to the heating efficiency and the preset grouping gradient, and the retained candidate electric heaters are divided into two groups to obtain the electric heaters corresponding to the first test device and the second test device respectively; the ratio of the maximum value of the heating efficiency of all electric heaters in the first test device to the minimum value of the heating efficiency of all electric heaters in the second test device exceeds the third threshold.

8. A device for testing the cooling capacity of a chiller, characterized in that: The device comprises: A temperature determination module is used to obtain a target test temperature under a target working condition; A benchmark test module is used to place the device to be tested under a preset test environment and obtain a first change trend of the outlet liquid temperature of the device to be tested when the outlet liquid temperature stabilizes to the ambient temperature; A first testing module is configured to determine a test heating efficiency output by the first testing device based on the first variation trend, adjust the outlet temperature of the liquid to be close to a target detection temperature using a heat balance method and the first testing device, and obtain a second variation trend of the outlet temperature variation process; The second test module is used to compare the first and second change trends to obtain a comparison result, and adopt a heat balance method and, based on the comparison result, use the first test device or the second test device to adjust the liquid outlet temperature to stabilize at a target detection temperature, thereby obtaining a cooling capacity parameter detection result of the target operating condition; Both the first and second test devices are composed of a number of electric heaters, each electric heater has a corresponding heater rated power and heating efficiency, the average value of the heating efficiency of all electric heaters in the first test device is smaller than the average value of the heating efficiency of all electric heaters in the second test device, the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the first test device does not exceed the first threshold, and the difference between the minimum and maximum values ​​of the heating efficiency of all electric heaters in the second test device does not exceed the second threshold.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method for testing the cooling capacity of a chiller according to any one of claims 1 to 7 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for testing the cooling capacity of a chiller according to any one of claims 1 to 7 are implemented.

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