A plate heat exchanger performance test platform

Abstract

The utility model discloses a plate heat exchanger performance test platform. The test device is constituted by refrigerant system, cold and hot water system, electrical control system, data acquisition system etc. The refrigerant system includes auxiliary condenser, auxiliary evaporator, compressor, expansion valve, mass flowmeter etc. The cold and hot water system includes cold water tank, hot water tank, water pump, water cooling unit, electric heater, electromagnetic flowmeter etc. The electrical control system is used for controlling the compressor, water pump, heater, electric valve door etc. in the system. The data acquisition system is used for measuring all thermal parameters in the measuring device. The test platform can carry out water-water heat exchanger, condenser, evaporator 3 kinds of test, and has "fixed capacity", "fixed flow", "fixed temperature difference" etc. Test method. The system can control the inlet, outlet water temperature of heat exchanger, the temperature, pressure, superheat, subcooling of refrigerant etc. parameter, satisfies multiple test working condition.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger performance testing technology, specifically to a plate heat exchanger performance testing system. Background Technology

[0002] Plate heat exchangers are widely used heat exchange equipment in industrial production. As an effective device for utilizing and saving energy, their performance plays an important role in product quality, energy utilization rate, and the economy and reliability of system operation.

[0003] Existing plate heat exchanger performance testing systems are relatively simple and have limited functionality. For example, the test platforms in the standards "JB / T 8701-2018 Plate Heat Exchangers for Refrigeration" and "JB / T 14073-2022 Performance and Evaluation Methods for Plate Heat Exchangers for Air Conditioning and Heat Pump Systems" can only perform one type of test, such as water-to-water heat exchange or water-to-refrigerant heat exchange. Furthermore, they only specify the inlet and outlet water temperatures and refrigerant temperatures during the test, without specifying other parameters, resulting in a limited operating condition. Currently, most heat exchanger performance testing platforms in research are simple in function, operate under limited conditions, have few adjustable parameters, and consume a lot of energy. They lag behind the development of the heat exchanger industry and cannot meet current needs. Utility Model Content

[0004] Based on the above, the purpose of this utility model is to provide a heat exchanger performance testing platform that can perform water-to-water heat exchange, as well as evaporator and condenser experiments. It also provides multiple modes including constant temperature difference, constant flow rate, and constant capacity, and can precisely control parameters such as hot and cold water flow rates, refrigerant flow rates, water temperature difference, refrigerant temperature difference, and pressure. This improves the practicality of the testing system and reduces the cost of heat exchanger testing systems.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A plate heat exchanger performance testing platform is disclosed. The testing device includes a refrigerant system, a hot and cold water system, a data acquisition system, and an electrical control system. In the refrigerant system, a compressor and an oil separator can be sequentially connected to an auxiliary condenser, a liquid receiver, a subcooler, a dryer filter, a mass flow meter, the heat exchanger under test, and a gas-liquid separator, or sequentially connected to a superheater, the heat exchanger under test, a dryer filter, a mass flow meter, and an auxiliary evaporator to form a main refrigerant circuit. Furthermore, the compressor and oil separator are sequentially connected to the auxiliary condenser, liquid receiver, subcooler, auxiliary evaporator, and gas-liquid separator to form an auxiliary circuit. In the hot and cold water system… The cold water tank is connected to the heat exchanger under test via a water pump and an electromagnetic flow meter, while the hot water tank is connected to the heat exchanger under test via a water pump and an electromagnetic flow meter. The cold water tank is also connected to a water-cooled chiller unit and contains an electric heater, while the hot water tank contains an electric heater. The data acquisition system includes platinum resistance thermometers, pressure sensors, differential pressure sensors, and flow meters installed on various connecting pipes of the heat exchanger under test. The electrical control system includes a PLC, contactors, relays, and regulators for automatic control of the water pumps and electric heaters in the hot and cold water systems, as well as the compressors and electric valves in the refrigerant system. Furthermore, the test platform can perform tests on water-to-water heat exchangers, condensers, and evaporators. The refrigerant system piping is equipped with electromagnetic valves one to six, which automatically switch between the three test methods under PLC control. Furthermore, the test platform has a fixed-capacity test mode. This fixed-capacity test mode means that the system automatically sets the inlet and outlet temperatures and flow rates on the primary side according to the set heat exchange capacity, and then measures the medium parameters on the secondary side to compare the heat exchange on both sides. Furthermore, in the water-to-water heat exchange test, the constant capacity mode refers to the heat exchange capacity of the heat exchanger being tested being determined by the hot water inlet temperature, the hot water flow rate, and the hot water outlet temperature. Furthermore, in the evaporation and condensation tests, the refrigerant system has a main loop and auxiliary branches; the constant capacity mode refers to the heat exchange capacity of the heat exchanger being tested being determined by the water-side inlet temperature, the water-side flow rate, and the water-side outlet temperature.

[0007] Furthermore, the refrigerant system also includes solenoid valves one through six.

[0008] Furthermore, the hot and cold water system includes a cold water tank, a hot water tank, a water pump, a water-cooled unit, an electric heater, and an electromagnetic flow meter. The outlets of the cold water tank and the hot water tank are connected to the inlet of the heat exchanger under test via the water pump, and the outlet of the heat exchanger under test is connected to the inlet of the cold water tank and the hot water tank. The hot water tank and the cold water tank are equipped with float valves, level gauges, and electric heaters. A platinum resistance thermometer and a temperature controller are installed at the outlet of the tanks. The cold water tank is connected to the water-cooled unit to achieve stable water level and constant water temperature within the tanks.

[0009] Furthermore, the electrical control system includes a PLC, contactors, relays, and regulators, used to control the compressor, water pump, electric heater, and electric valves in the system; the data acquisition system includes platinum resistance thermometers, pressure sensors, differential pressure sensors, flow meters, and data acquisition instruments installed on each connecting pipe of the heat exchanger under test. The platinum resistance thermometers, pressure sensors, and flow meters are all connected to the data acquisition instrument and used to measure all thermal parameters in the device, including temperature, flow rate, pressure, and differential pressure.

[0010] When the heat exchanger under test is operated as a water-to-water heat exchanger, the hot water inlet and outlet are connected to the A and B ports of the heat exchanger under test, solenoid valves one to six are closed, the hot and cold water system is started, and the refrigerant system is not working. Driven by the water pump, the hot and cold water enter the cold and hot sides of the heat exchanger under test from the hot and cold water tanks respectively. After exchanging heat in the heat exchanger under test, the hot and cold water return to the hot and cold water tanks respectively.

[0011] When the heat exchanger under test is operating as a condenser, the hot water side inlet and outlet are connected to the A and B ports of the auxiliary evaporator. Solenoid valves two, three, and five are activated, while solenoid valves one, four, and six are closed, switching the system to a condensing circuit. High-temperature, high-pressure refrigerant is discharged from the compressor outlet and sequentially enters the oil separator, the superheater, the heat exchanger under test, the dryer filter, the mass flow meter, the auxiliary evaporator, and the gas-liquid separator before returning to the compressor.

[0012] When the heat exchanger under test is operating as an evaporator, the hot water side inlet and outlet are connected to the A and B ports of the auxiliary evaporator. Solenoid valves one, four, and six are activated, while solenoid valves two, three, and five are closed, switching the system to an evaporation circuit. High-temperature, high-pressure refrigerant exits from the compressor discharge port and sequentially enters the oil separator, the auxiliary condenser, the liquid receiver, the subcooler, the dryer filter, the mass flow meter, the heat exchanger under test, and the gas-liquid separator before returning to the compressor.

[0013] This utility model also provides the following technical solution:

[0014] A test method for a heat exchanger test platform, employing any of the aforementioned heat exchanger test platforms, includes:

[0015] The electric heater and water chiller are controlled to bring the water temperature in the cold water tank and hot water tank to the set temperature; the water pump is controlled to draw water from the water tank into the heat exchanger under test to achieve the set flow rate.

[0016] Control the compressor, expansion valve, subcooler, and superheater to ensure that the temperature, flow rate, and pressure of the refrigerant reach the set values;

[0017] The temperature, pressure, differential pressure, and flow rate at the inlet and outlet of the heat exchanger under test are recorded by the temperature sensor, pressure sensor, and flow meter, respectively, and the data are calculated and reported using software.

[0018] The beneficial effects of this utility model are:

[0019] This solution provides a plate heat exchanger performance testing system that, through optimized flow path design, can switch between evaporators, condensers, and water-to-water heat exchangers. The solution supports multi-condition testing, simulating actual operating conditions for different temperatures, pressures, and flow rates. It features constant flow rate, constant temperature difference, and constant capacity testing modes to verify the heat exchanger's performance under complex conditions. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of a water-to-water heat exchange experiment.

[0023] Figure 3 This is a schematic diagram of the evaporator experiment system;

[0024] Figure 4 This is a schematic diagram of the condenser experiment system.

[0025] Figure 1 In the middle section: 1. Cold water tank, 2. Water pump three, 3. Liquid receiver, 4. Auxiliary condenser, 5. Oil separator, 6. Compressor, 7. Gas-liquid separator, 8. Auxiliary evaporator, 9. Superheater, 10. Subcooler, 11. Dryer filter, 12. Mass flow meter, 13. Heat exchanger under test, 14. Electromagnetic flow meter one, 15. Water pump two, 16. Electric heater one, 17. Hot water tank, 18. Electromagnetic flow meter two, 19. Water pump one, 20. Water pump four, 21. Water-cooled unit, 22. Solenoid valve one, 23. Solenoid valve two, 24. Solenoid valve three, 25. Solenoid valve four, 26. Solenoid valve five, 27. Solenoid valve six, 28. Electric heater two. Detailed Implementation

[0026] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0027] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] like Figure 1 As shown in the embodiment of this application, a heat exchanger performance testing system is provided, which can accurately control the inlet and outlet temperatures, flow rates, and pressure parameters. It can test the heat exchange capacity, heat transfer coefficient, logarithmic heat transfer temperature difference, and thermal balance error of plate heat exchangers, and can compare and analyze the heat transfer conditions and performance of different heat exchangers.

[0032] To achieve accurate and stable inlet temperature of the heat exchanger (13) under test, insulation material is used to cover the surface of the water tank and the water pipes. Five sets of electric heaters (16) are installed in the hot water tank (17), three of which have fixed power and the other two have adjustable power. The temperature of the hot water is measured by a platinum resistance thermometer installed in the hot water tank, and the signal is transmitted to the PID controller. Under its control, the on / off state and power of the electric heaters are adjusted, thereby maintaining a constant temperature in the hot water tank. A water-cooled unit (21) is connected to the cold water tank (1), consisting of three compressors and a fan leading to the outside. The cold water tank is also equipped with an electric heater (28) of the same specifications as the one in the hot water tank. Compensation is performed when the temperature is lower than the set temperature. Under the control of the PID controller, the water-cooled unit and the electric heaters work together to control the temperature of the cold water tank to the set temperature.

[0033] Two variable frequency water pumps are installed in both the cold water and hot water systems. Driven by pump one (19) and pump two (15), the cold and hot water circulates in the heat exchanger under test (13) before returning to the water tank. In constant flow mode, the water flow rate is read by electromagnetic flowmeter one (14) and electromagnetic flowmeter two (18), and a closed-loop feedback control circuit is formed using a PID controller and the variable frequency water pumps to control the flow rate. For different flow test requirements, the pump speed is controlled by a PWM duty cycle signal, achieving a maximum flow rate of 1.8 m. 3 The flow rate is measured in h. In constant temperature difference mode, the outlet water temperature is measured by a platinum resistance thermometer set at the outlet of the heat exchanger under test. The PID controller receives the signal and changes the pump speed. The higher the speed, the higher the flow rate, and the smaller the temperature difference.

[0034] The refrigerant system consists of a main circuit and auxiliary branches. Measurement points are set up in the main circuit to collect various parameters. The auxiliary branches contain an auxiliary evaporator (8) and an auxiliary condenser (4). During testing, the water flow rate through these branches is adjusted to control the refrigerant flow rate in the auxiliary branches, thus changing the refrigerant flow rate in the main circuit. If the water flow rate increases, the auxiliary condenser and auxiliary evaporator will consume more refrigerant, increasing the refrigerant flow rate in the auxiliary branches, which in turn decreases the flow rate in the main circuit.

[0035] During the evaporation test, the refrigerant temperature before the expansion valve is controlled by the subcooler (10), and the water in the cold water tank enters the subcooler under the push of water pump four (20). The temperature before the valve is measured by a platinum resistance thermometer, and the PID controller receives the signal and controls the speed of the water pump. The refrigerant temperature before the valve is controlled by adjusting the flow rate of the cold water flowing through the subcooler. During the condensation test, the inlet refrigerant temperature is controlled by the superheater (9), and the water in the cold water tank enters the superheater under the push of water pump four (20). The refrigerant temperature at the condenser inlet is measured by a platinum resistance thermometer, and the PID controller receives the signal and controls the speed of the water pump. The refrigerant temperature at the condenser inlet is controlled by adjusting the flow rate of the cold water flowing through the superheater.

[0036] Example 1

[0037] This embodiment can test water-to-water heat exchangers. For example... Figure 2 As shown, the hot and cold water system includes a cold water tank (1), a water pump (19), an electromagnetic flow meter (18), a water-cooled unit (21), a hot water tank (17), a water pump (15), an electromagnetic flow meter (14), an electric heater (16), and an electric heater (28).

[0038] The specific testing method is as follows:

[0039] When the heat exchanger under test is operating as a water-to-water heat exchanger, the hot water inlet and outlet are connected to the A and B ports of the heat exchanger under test, solenoid valves one to six are closed, the hot and cold water system is started, and the refrigerant system is not working. The hot and cold water enter the cold and hot sides of the heat exchanger under test respectively from the hot and cold water tanks under the drive of the water pump. After heat exchange in the heat exchanger under test, the hot and cold water return to the hot and cold water tanks respectively. The temperature of the hot water is measured by the platinum resistance thermometer installed in the hot water tank (17), and the signal is transmitted to the PID controller. Under its control, the on / off state and power of the electric heater one (16) are adjusted, thereby maintaining a constant temperature in the hot water tank. A water chiller unit (21) is connected to the cold water tank (1), and an electric heater two (28) of the same specifications as the one in the hot water tank is also installed. Compensation is performed when the temperature is lower than the set temperature. Under the control of the PID controller, the water chiller unit and the electric heater jointly control the temperature of the cold water tank to the set temperature. Through the above measures, the inlet water temperature of the heat exchanger under test will remain stable. In constant temperature difference mode, the outlet water temperature is measured by a platinum resistance thermometer installed at the outlet of the heat exchanger under test, and the signal is transmitted to the PID controller, which controls the speed of the water pump. The higher the speed, the greater the flow rate, and the smaller the temperature difference. In constant flow mode, the flow rate is measured by electromagnetic flowmeter 1 (14) and electromagnetic flowmeter 2 (18), and the signal is transmitted to the PID controller, which controls the variable frequency water pump to regulate the flow rate.

[0040] The constant capacity mode is as follows: the inlet water temperature on the hot water side and the cold water side is used to control the electric heater one (16), the water chiller unit (21), and the electric heater two (28) by measuring the water temperature. The flow rate on the hot water side is used to control the speed of the water pump two (15) on the hot water side by measuring the value of the electromagnetic flowmeter one (14). The outlet water temperature on the hot water side is used to control the speed of the water pump one (19) on the cold water side by measuring the water temperature. The larger the flow rate on the cold water side, the more heat is removed, and the lower the outlet water temperature on the hot water side. The heat exchange capacity can be determined by the three parameters of the inlet water temperature, outlet water temperature, and hot water flow rate on the hot water side.

[0041] Example 2

[0042] This embodiment also provides a heat exchanger performance testing system, which can be used to test evaporators. For example... Figure 3 As shown, this embodiment differs from Embodiment 1 in that a refrigerant system is added to the original embodiment. The refrigerant system includes a compressor (6), an oil separator (5), an auxiliary condenser (4), a liquid receiver (3), a subcooler (10), a dryer filter (11), a mass flow meter (12), a gas-liquid separator (7), an auxiliary evaporator (8), and a superheater (9). The refrigerant system piping is equipped with solenoid valves one to six (22), (23), (24), (25), (26), and (27).

[0043] The specific testing method is as follows:

[0044] When the heat exchanger under test is running as an evaporator, solenoid valves one, four, and six are activated, and solenoid valves two, three, and five are closed. The hot water side inlet and outlet are connected to the A and B ports of the auxiliary evaporator, and the system is switched to an evaporation circuit. In the main circuit of the refrigeration system: the high-temperature and high-pressure refrigerant exits from the compressor (6) exhaust port, enters the oil separator (5) for oil removal, and then condenses and exchanges heat through the auxiliary condenser (4) before becoming liquid and entering the liquid receiver (3). The liquid refrigerant passes through the subcooler (10) and the dryer filter (11) before entering the mass flow meter (12). After the flow rate is measured, it enters the heat exchanger under test, where it evaporates and exchanges heat before becoming gaseous. After passing through the gas-liquid separator (7), it returns to the compressor.

[0045] During the evaporation test, the inlet and outlet temperatures and flow rates of the cold water side are measured and controlled in the same way as in Example 1. The refrigerant temperature before the valve on the refrigerant side is controlled by the subcooler (10), and the cold water enters the subcooler under the push of the fourth water pump (20). The temperature before the valve is measured by a platinum resistance thermometer, and the PID controller receives the signal and controls the speed of the water pump. The refrigerant temperature before the valve is controlled by adjusting the flow rate of the cold water flowing through the subcooler. The flow rate of the refrigerant is controlled by the auxiliary evaporator (8) in the auxiliary branch. The flow rate of the water flowing through it is adjusted, thereby controlling the refrigerant flow rate of the auxiliary branch and realizing the change of the refrigerant flow rate of the main circuit. The refrigerant flow rate of the main circuit is measured by a mass flow meter (12), and the PID controller receives the flow rate signal and controls the speed of the second water pump (15). If the water flow rate increases, the auxiliary condenser will consume more refrigerant, the refrigerant flow rate of the auxiliary branch will increase, and the flow rate of the main circuit will decrease.

[0046] During the evaporation test, the constant capacity mode is as follows: the inlet temperature of the cold water side is controlled by the measured water temperature to control the electric heater II (28) and the water chiller (21); the flow rate of the cold water side is controlled by the value of the electromagnetic flowmeter II (18) to control the speed of the water pump I (19) on the cold water side; and the outlet temperature of the cold water side is controlled by the auxiliary evaporator (8). The outlet water temperature is obtained by measuring the platinum resistance thermometer, and the PID controller controls the speed of the water pump II (15) after receiving the temperature signal. If the water flow rate through the auxiliary evaporator increases, the auxiliary evaporator will consume more refrigerant, the refrigerant flow rate in the main circuit will decrease, and the outlet temperature of the cold water side will be higher. The heat exchange capacity can be determined by the three parameters of the inlet water temperature, outlet water temperature, and cold water flow rate on the cold water side.

[0047] Example 3

[0048] This embodiment also provides a heat exchanger performance testing system, which can be used to test condensers. For example... Figure 4 As shown, the difference between this embodiment and embodiment two is that, based on embodiment two, the working mode is switched by opening and closing the solenoid valve.

[0049] The specific testing method is as follows:

[0050] When the heat exchanger under test is running as a condenser, solenoid valves two, three, and five are activated, and solenoid valves one, four, and six are closed. The hot water side inlet and outlet are connected to the A and B ports of the auxiliary evaporator, and the system is switched to a condensing circuit. In the main circuit of the refrigeration system: the high-temperature and high-pressure refrigerant is discharged from the compressor (6) exhaust port, enters the oil separator (5) for oil removal, passes through the superheater (9), and enters the heat exchanger under test. After condensation and heat exchange, it becomes liquid. The liquid refrigerant passes through the dryer filter (11) and enters the mass flow meter (12). After measuring the flow rate, it enters the auxiliary evaporator (8). After evaporation and heat exchange, the refrigerant becomes gaseous, passes through the gas-liquid separator (7), and returns to the compressor.

[0051] During the condensation test, the measurement and control of the inlet and outlet temperatures and flow rates on the water side are the same as in Example 1. The inlet refrigerant temperature on the refrigerant side is controlled by the superheater (9), and cold water enters the superheater under the push of water pump four (20). The refrigerant temperature at the condenser inlet is measured by a platinum resistance thermometer. After receiving the signal, the PID controller controls the speed of the water pump and controls the refrigerant temperature at the condenser inlet by adjusting the flow rate of cold water flowing through the superheater. The refrigerant flow rate is controlled by the auxiliary condenser (4) in the auxiliary branch. The flow rate of water flowing through it is adjusted to control the refrigerant flow rate of the auxiliary branch and realize the change of the refrigerant flow rate in the main circuit. The refrigerant flow rate in the main circuit is measured by a mass flow meter (12). After receiving the flow rate signal, the PID controller controls the speed of water pump three (2). If the water flow rate increases, the auxiliary condenser will consume more refrigerant, the refrigerant flow rate in the auxiliary branch will increase, and the flow rate in the main circuit will decrease.

[0052] During the condensation test, the constant capacity mode is as follows: the inlet temperature of the cold water side is controlled by the measured water temperature to control the electric heater II (28) and the water chiller (21); the flow rate of the cold water side is controlled by the value of the electromagnetic flowmeter II (18) to control the speed of the water pump I (19) on the cold water side; and the outlet temperature of the cold water side is controlled by the auxiliary condenser (4). By receiving the temperature signal from the measured outlet water temperature, the PID controller controls the speed of the water pump III (2). If the water flow rate through the auxiliary condenser increases, the auxiliary condenser will consume more refrigerant, the refrigerant flow rate in the main circuit will decrease, and the outlet temperature of the cold water side will be higher. The heat exchange capacity can be determined by the three parameters of the inlet water temperature, outlet water temperature, and cold water flow rate on the cold water side.

[0053] The above description is merely a preferred embodiment of this application and does not constitute any limitation on this application. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of this application and based on the technical essence of this application shall still fall within the protection scope of this utility model.

Claims

1. A plate heat exchanger performance testing platform, characterized in that: This includes refrigerant systems, hot and cold water systems, data acquisition systems, and electrical control systems; In the refrigerant system, the compressor (6) and oil separator (5) can be connected in sequence with the auxiliary condenser (4), liquid receiver (3), subcooler (10), dryer filter (11), mass flow meter (12), heat exchanger under test (13), and gas-liquid separator (7) through the control of the solenoid valve, or connected in sequence with the superheater (9), heat exchanger under test (13), dryer filter (11), mass flow meter (12), and auxiliary evaporator (8) to form the refrigerant main circuit; In the hot and cold water system, the cold water tank (1) is connected to the heat exchanger (13) under test through a water pump (19) and an electromagnetic flow meter (18), and the hot water tank (17) is connected to the heat exchanger (13) under test through a water pump (15) and an electromagnetic flow meter (14). The cold water tank (1) is connected to the water-cooled unit (21) and is equipped with an electric heater (28) inside. The hot water tank (17) is equipped with an electric heater (16) inside. The data acquisition system includes platinum resistance thermometers, pressure sensors, differential pressure sensors and flow meters installed on each connecting pipe of the heat exchanger under test (13); The electrical control system includes a PLC, contactors, relays, and regulators, and is used to automatically control the water pumps and electric heaters in the hot and cold water system, as well as the compressors and electric valves in the refrigerant system.

2. The plate heat exchanger performance testing platform according to claim 1, characterized in that: The test platform can perform three tests: water-to-water heat exchanger, condenser and evaporator. The pipeline of the refrigerant system is equipped with solenoid valves one to six (22), (23), (24), (25), (26) and (27), which can automatically switch between the three test methods under the control of PLC.

3. The plate heat exchanger performance testing platform according to claim 2, characterized in that: The testing platform described has a certain capability testing mode.

4. The plate heat exchanger performance testing platform according to claim 3, characterized in that: The aforementioned constant capacity test mode refers to the system automatically setting the inlet and outlet temperatures and flow rates on the primary side according to the set heat exchange capacity, and then measuring the medium parameters on the secondary side to compare the heat exchange on both sides.

5. The plate heat exchanger performance testing platform according to claim 3, characterized in that: In water-to-water heat exchange testing, the aforementioned constant capacity test mode means that the heat exchange capacity of the heat exchanger under test is jointly determined by the hot water inlet temperature, the hot water flow rate, and the hot water outlet temperature.

6. The plate heat exchanger performance testing platform according to claim 3, characterized in that: During evaporation and condensation tests, the refrigerant system has a main circuit and auxiliary branches; the aforementioned constant capacity test mode means that the heat exchange capacity of the heat exchanger under test is determined by the water-side inlet temperature, water-side flow rate, and water-side outlet temperature.

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