A multifunctional organic heat transfer testing system and method

Abstract

The present application relates to a multifunctional organic heat transfer test system and method, wherein the system includes a heat exchange test module, a hot medium circulation module, a cold medium circulation module, a data acquisition control module and an auxiliary equipment module, the heat exchange test module includes a test heat exchanger, the hot medium circulation module includes a full condenser 1, a hot medium storage tank, a circulation pump 1, a steam heater and a tail cooler 1, the cold medium circulation module includes a tail cooler 2, a cold medium storage tank, a circulation pump 2 and a thermostat, the auxiliary equipment module is respectively connected to the hot medium circulation module and the cold medium circulation module, the auxiliary equipment module includes a cooling tower, a cooling water pump and a vacuum pump, the data acquisition control module is connected to the heat exchange test module, the hot medium circulation module, the cold medium circulation module and the auxiliary equipment module, and the data acquisition control module includes a temperature sensor, a pressure sensor, a flow sensor and a PLC controller.

Description

Technical Field

[0001] The present application relates to the field of heat transfer testing technology, and in particular to a multifunctional organic heat transfer testing system and method. Background Art

[0002] In the chemical, energy, and refrigeration sectors, testing the heat transfer performance of organic compounds is a critical step in equipment development, process optimization, and system design. Its results directly impact the selection, energy efficiency, and operational stability of heat exchange equipment. However, existing heat transfer testing technologies still have numerous limitations, making them inadequate for testing under complex operating conditions. For example, they can only test liquid-to-liquid heat transfer without phase change, or are only suitable for single-sided vapor-to-liquid phase change scenarios. Simulating different operating conditions, such as two-sided phase change (such as the coexistence of vapor-to-liquid condensation and evaporation in a distillation reboiler) or single-sided phase change (such as steam condensation and liquid heating in a solution heater), requires dedicated testing platforms. This not only results in high equipment investment costs and large footprints, but also presents complex testing procedures and difficulty switching between operating conditions, severely hindering the efficiency of organic compound heat transfer performance research. Furthermore, when testing cold-side condensation phase change conditions, traditional methods often use flow meters to directly measure the condensate flow rate and calculate the heat load based on the latent heat of the phase change. However, because the latent heat of phase change in organic matter is typically large, even small flowmeter measurement fluctuations (e.g., ±1% error) can be significantly amplified by the calculation relationship of "heat load = condensate flow rate × latent heat of phase change," leading to significant deviations in heat load test results and, in turn, affecting the accuracy of heat transfer coefficient tests. Therefore, developing a multifunctional, safe, reliable, and precise organic heat transfer testing system to address the limitations of traditional technologies, such as limited functionality, low measurement accuracy, and high explosion risk, is a pressing need in the field of heat transfer testing. Summary of the Invention

[0003] The present invention aims to provide a multifunctional organic heat transfer testing system and method to address the deficiencies in the prior art. The technical problems to be solved by the present invention are achieved through the following technical solutions.

[0004] A multifunctional organic heat transfer test system, comprising a heat exchange test module, a hot medium circulation module, a cold medium circulation module, a data acquisition and control module, and an auxiliary equipment module;

[0005] The heat medium circulation module includes a full condenser, a heat medium storage tank, a circulation pump, a steam heater and a tail cooler;

[0006] The cold medium circulation module includes a second tail cooler, a cold medium storage tank, a second circulation pump and a thermostat;

[0007] The auxiliary equipment module includes a cooling tower, cooling water pump and vacuum pump;

[0008] The data acquisition control module is connected to the heat exchange test module, the hot medium circulation module, the cold medium circulation module and the auxiliary equipment module. The data acquisition control module includes a temperature sensor, a pressure sensor, a flow sensor and a PLC controller;

[0009] A discharge port is provided at the bottom of the heat medium storage tank, which is connected to an inlet of a circulating pump, an outlet of a circulating pump is connected to the medium side inlet of a steam heater, the medium side outlet of the steam heater is connected to the hot side inlet of a heat exchange test module, the hot side outlet of the heat exchange test module is connected to the inlet of a full condenser, an outlet of a full condenser is connected to a reflux port 1 at the top of the heat medium storage tank, the non-condensable gas outlet at the top of the heat medium storage tank is connected to an inlet of a tail cooler, and an outlet of a tail cooler is respectively connected to a vacuum pump and a reflux port 3 at the top of the heat medium storage tank;

[0010] A discharge port is provided at the bottom of the cold medium storage tank, which is connected to the second inlet of the circulating pump, the second outlet of the circulating pump is connected to the inlet of the thermostat, the outlet of the thermostat is connected to the cold side inlet of the heat exchange test module, the cold side outlet of the heat exchange test module is connected to the reflux port 3 of the cold medium storage tank, the non-condensable gas outlet at the top of the cold medium storage tank is connected to the inlet of the second tail cooler, and the second outlet of the tail cooler is respectively connected to the vacuum pump and the reflux port 3 at the top of the cold medium storage tank;

[0011] The first condenser, the first tail cooler and the second tail cooler are respectively connected to a cooling circuit formed by a cooling tower and a cooling water pump.

[0012] Preferably, the heat medium circulation module further includes a gas-liquid separator 1, a side wall of the gas-liquid separator is provided with a feed port, a top is provided with an air outlet, and a bottom is provided with a liquid outlet, the medium side outlet of the steam heater is connected to the side wall feed port of the gas-liquid separator 1, the air outlet at the top of the gas-liquid separator 1 is connected to the hot side inlet of the heat exchange test module, and the bottom liquid outlet of the gas-liquid separator 1 is connected to the reflux port 2 of the heat medium storage tank;

[0013] In the cold medium circulation module, the cold side outlet of the heat exchange test module is no longer connected to the reflux port 3 of the cold medium storage tank, but is connected to the reflux port 2 of the cold medium storage tank.

[0014] Preferably, the cold medium circulation module also includes a gas-liquid separator 2, a full condenser 2 and a metering tank. The gas-liquid separator 2 is provided with a feed port on its side wall, an air outlet on its top and a liquid outlet on its bottom. The cold side outlet of the heat exchange test module is connected to the feed port on the side wall of the gas-liquid separator 2, the air outlet on the top of the gas-liquid separator 2 is connected to the inlet of the full condenser 2, the liquid outlet on the bottom of the gas-liquid separator 2 is connected to the reflux port 2 of the cold medium storage tank, the outlet of the full condenser 2 is respectively connected to the metering tank and the reflux port 1 of the cold medium storage tank, the full condenser 2 is connected to a cooling circuit formed by a cooling tower and a cooling water pump, the bottom outlet of the metering tank is connected to the reflux port 1 of the cold medium storage tank, and the air outlet on the top of the metering tank is connected to the air inlet of the tail cooler 2.

[0015] Preferably, the heat medium circulation module further includes a gas-liquid separator 1, a feed port is provided on one side wall of the gas-liquid separator, a gas outlet is provided on the top, and a liquid outlet is provided on the bottom, the medium side outlet of the steam heater is respectively connected to the hot side inlet of the heat exchange test module and the side wall feed port of the gas-liquid separator 1, the gas outlet on the top of the gas-liquid separator 1 is connected to the hot side inlet of the heat exchange test module, and the liquid outlet at the bottom of the gas-liquid separator 1 is connected to the reflux port 2 of the heat medium storage tank;

[0016] The cold medium circulation module also includes a gas-liquid separator 2, a full condenser 2 and a metering tank. The gas-liquid separator 2 is provided with a feed port on its side wall, an air outlet on its top and a liquid outlet on its bottom. The outlet of the cold side channel of the heat exchange test module is respectively connected to the feed port on the side wall of the gas-liquid separator 2 and the reflux port 2 of the cold medium storage tank. The air outlet on the top of the gas-liquid separator 2 is connected to the inlet of the full condenser 2, and the liquid outlet on the bottom of the gas-liquid separator 2 is connected to the reflux port 2 of the cold medium storage tank. The outlet of the full condenser 2 is respectively connected to the metering tank and the reflux port 1 of the cold medium storage tank. The full condenser 2 is connected to a cooling circuit formed by a cooling tower and a cooling water pump. The bottom outlet of the metering tank is connected to the reflux port 1 of the cold medium storage tank, and the air outlet on the top of the metering tank is connected to the air inlet of the tail cooler 2.

[0017] Preferably, the heat exchange test module includes a test heat exchanger, the PLC controller processes the data collected by the temperature sensor, pressure sensor, and flow sensor, and calculates the thermal performance parameters of the test heat exchanger. The gas-liquid separator is provided with a wire mesh demister inside to remove droplets entrained in the gas phase.

[0018] The present invention also provides a variety of heat transfer test methods for different situations. The first test method includes the following steps:

[0019] S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively;

[0020] S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and then enters the steam heater for heating before entering the test heat exchanger. The cooled heat medium enters the full condenser 1 and then returns to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump. The test pressure is regulated by the vacuum pump.

[0021] S3: Start the circulation pump 2. The cold circulating medium enters the thermostat for cooling and then enters the test heat exchanger. The heated cold medium returns to the cold medium storage tank. After 30 minutes of stable operation, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △T =(( T hi - T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), according to the cold medium flow W c ,density r c , specific heat Cp c , calculate the heat load of the test heat exchanger Q , Q = W c × r c × Cp c × ( T co -T ci ), according to △ T and heat exchange area S , calculate the heat transfer coefficient A , A = Q / (△ T ×S);

[0022] S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel;

[0023] S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

[0024] The second test method includes the following steps:

[0025] S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively;

[0026] S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and enters the steam heater. It flashes and separates gas and liquid in the gas-liquid separator 1. The unvaporized portion flows back to the heat medium storage tank. The steam passes through the wire mesh to remove foam and enter the test heat exchanger. After releasing heat, the unliquefied portion enters the full condenser 1 for condensation and flows back to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump.

[0027] S3: Start the circulation pump 2. The cold circulating medium enters the thermostat for cooling and then enters the test heat exchanger. The heated cold medium returns to the cold medium storage tank. After 30 minutes of stable operation, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △T =(( T hi - T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), according to the cold medium flow W c ,density r c , specific heat Cp c , calculate the heat load of the test heat exchanger Q ,Q = W c × r c × Cp c × ( T co -T ci ), according to △ T and heat exchange area S , calculate the heat transfer coefficient A , A = Q / (△ T ×S);

[0028] S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel;

[0029] S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

[0030] The third test method includes the following steps:

[0031] S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively;

[0032] S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and then enters the steam heater for heating before entering the test heat exchanger. The cooled heat medium enters the full condenser 1 and then returns to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump.

[0033] S3: Start the circulation pump 2. The cold circulation medium enters the thermostat for cooling and then enters the test heat exchanger for gas-liquid separation. The cold medium returns to the cold medium storage tank. The steam passes through the wire mesh to separate the entrained droplets and then enters the total condenser 2 for condensation and then returns to the cold medium storage tank. After stable operation for 30 minutes, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △ T =(( T hi -T co )-( T ho-T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), switch the condensate from the second outlet of the condenser to the metering tank and record the time period t and the liquid level change of the metering tank q v , latent heat of vaporization when passing through cold medium h c and density r c , calculate the heat load of the test heat exchanger Q , Q =△ q v × r c / t × h c , according to △ T and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S);

[0034] S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel;

[0035] S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

[0036] The fourth test method includes the following steps:

[0037] S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively;

[0038] S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and enters the steam heater. It flashes in the gas-liquid separator 1 to achieve gas-liquid separation. The unvaporized part flows back to the heat medium storage tank. The steam passes through the wire mesh to remove foam and enters the test heat exchanger. The steam is condensed in the full condenser 1 and flows back to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump.

[0039] S3: Start the circulation pump 2. The cold circulation medium enters the thermostat for cooling and then enters the test heat exchanger for gas-liquid separation. The cold medium returns to the cold medium storage tank. The steam passes through the wire mesh to separate the entrained droplets and then enters the total condenser 2 for condensation and then returns to the cold medium storage tank. After stable operation for 30 minutes, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △ T =(( T hi -T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), switch the condensate from the second outlet of the condenser to the metering tank and record the time period t and the liquid level change of the metering tank q v , latent heat of vaporization when passing through cold medium h c and density r c , calculate the heat load of the test heat exchanger Q , Q =△ q v × r c / t × h c , according to △ T and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S);

[0040] S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel;

[0041] S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

[0042] In the above four test methods, the flow rate of the hot medium channel of the test heat exchanger is controlled by the frequency of the circulation pump 1, the temperature of the hot medium circulation module is regulated by the steam heater, and the test pressure of the hot medium circulation module is regulated by the vacuum pump and the opening of the upper valve of the gas-liquid separator 1. The flow rate of the cold medium channel of the test heat exchanger is controlled by the frequency of the circulation pump 2, the temperature of the cold medium circulation module is regulated by the thermostat, and the test pressure of the cold medium circulation module is regulated by the vacuum pump and the opening of the upper valve of the gas-liquid separator 2. By changing the cold / hot medium flow rate of the test heat exchanger and the heat transfer temperature difference of the test heat exchanger, you can return to the corresponding mode again to perform the heat exchange performance test.

[0043] The multifunctional organic heat transfer testing system and method of the present invention have the following beneficial effects:

[0044] 1. The system integrates multiple modules such as hot medium circulation and cold medium circulation. It can simulate various organic industrial heat exchange scenarios and conduct heat transfer performance evaluation through the sensible heat heating and latent heat heating modes of the hot medium and the sensible heat rise and evaporation phase change modes of the cold medium, such as distillation tower top condenser, distillation reboiler, organic material liquid preheater, refrigeration / heat pump evaporator, refrigeration / heat pump condenser, ORC regenerator, etc.

[0045] 2. The system removes liquid droplets entrained in the gas phase through a wire mesh demister in the gas-liquid separator, and each module equipment and pipeline is covered with an insulation layer to reduce heat dissipation interference. In addition, in the cold medium evaporation phase change mode, the present invention adopts a condensate metering method to indirectly test the system heat load, avoiding the problem of excessive error in the conventional test method of using a flow meter to measure the condensate, and the system has high test accuracy.

[0046] 3. The circulation pump can be controlled by variable frequency to adjust the flow rate. The temperature can be precisely controlled by the steam supply and thermostat. The PLC controller can automatically generate curves and archive data. Combined with explosion-proof motors and other equipment, the system can ensure stable and safe operation. It can provide a reliable, stable and safe test platform support for the heat transfer performance testing of organic matter and the research and development of various new heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of the organic matter heat transfer testing system according to Example 1 of the present invention;

[0048] Figure 2 This is a flow chart of an organic matter heat transfer testing system according to Example 2 of the present invention;

[0049] Figure 3 This is a flow chart of an organic matter heat transfer testing system according to Example 3 of the present invention;

[0050] Figure 4 This is a flow chart of the organic heat transfer testing system of Example 4 of the present invention.

[0051] Explanation of the accompanying drawings: 1-test heat exchanger, 2-full condenser 1, 3-heat medium storage tank, 4-circulating pump 1, 5-steam heater, 6-tail cooler 1, 7-gas-liquid separator 1, 8-tail cooler 2, 9-gas-liquid separator 2, 10-full condenser 2, 11-metering tank, 12-cold medium storage tank, 13-circulating pump 2, 14-thermostat, 15-cooling tower, 16-cooling water pump, 17-vacuum pump, 18-PLC controller. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0056] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0057] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0058] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] Example 1

[0060] like Figure 1 As shown, it includes a heat exchange test module, a hot medium circulation module, a cold medium circulation module, a data acquisition control module and an auxiliary equipment module.

[0061] The heat exchange test module includes a test heat exchanger 1 having a hot medium circulation flow channel and a cold medium circulation flow channel.

[0062] The heat medium circulation module is connected to the heat medium circulation flow channel of the heat exchange test module, and is used to provide a stable heat source for the heat exchange test module. The heat medium circulation module includes a full condenser 2, a heat medium storage tank 3, a circulation pump 4, a steam heater 5 and a tail cooler 6.

[0063] The cold medium circulation module is connected to the cold medium circulation flow channel of the heat exchange test module to provide a stable cold source for the heat exchange test module. The cold medium circulation module includes a tail cooler 8, a cold medium storage tank 12, a circulation pump 13 and a thermostat 14.

[0064] The auxiliary equipment module is connected to the heat medium circulation module and the cold medium circulation module. The auxiliary equipment module includes a cooling tower 15 , a cooling water pump 16 and a vacuum pump 17 .

[0065] The data acquisition control module is connected to the heat exchange test module, the hot medium circulation module, the cold medium circulation module and the auxiliary equipment module. The data acquisition control module includes a temperature sensor, a pressure sensor, a flow sensor and a PLC controller 18.

[0066] The heat medium storage tank 3 is provided with a discharge port at the bottom, and a reflux port 1, a reflux port 3 and a non-condensable gas outlet at the top. The discharge port at the bottom of the heat medium storage tank 3 is connected to the inlet of a circulation pump 4, the outlet of the circulation pump 4 is connected to the medium side inlet of the steam heater 5, the medium side outlet of the steam heater 5 is connected to the hot side inlet of the heat exchange test module, the hot side outlet of the heat exchange test module is connected to the inlet of the full condenser 2, the outlet of the full condenser 2 is connected to the reflux port 1 of the heat medium storage tank 3, the non-condensable gas outlet of the heat medium storage tank 3 is connected to the inlet of the tail cooler 6, the outlet of the tail cooler 6 is respectively connected to the vacuum pump 17 and the reflux port 3 of the heat medium storage tank 3, the full condenser 2 is cooled by circulating water, the tail cooler 6 is cooled by circulating water, and the steam heater 5 is heated by raw steam.

[0067] The cold medium storage tank 12 is provided with a discharge port at the bottom, and a reflux port three and a non-condensable gas outlet at the top. The discharge port at the bottom of the cold medium storage tank 12 is connected to the inlet of the circulating pump 2 13, and the outlet of the circulating pump 2 13 is connected to the inlet of the thermostat 14. The outlet of the thermostat 14 is connected to the cold side inlet of the heat exchange test module, and the cold side outlets of the heat exchange test module are respectively connected to the reflux port three of the cold medium storage tank 12. The non-condensable gas outlet at the top of the cold medium storage tank 12 is connected to the inlet of the tail cooler 2 8, and the outlet of the tail cooler 2 8 is respectively connected to the vacuum pump and the reflux port three of the cold medium storage tank 12; the tail cooler 2 is cooled by circulating water; and the thermostat is introduced with cooling water or steam according to the system test requirements.

[0068] The full condenser 2, the tail cooler 6 and the tail cooler 8 are respectively connected to a cooling circuit formed by a cooling tower 15 and a cooling water pump 16.

[0069] The auxiliary equipment module is used to provide stable utility requirements for the test system, such as cooling water, vacuum, etc.

[0070] This embodiment simulates a heat exchange condition where both sides of the heat exchanger are liquid, such as a regenerator commonly used in the chemical industry, with 80°C ethanol on the hot side and 30°C ethanol on the cold side. The test heat exchanger 1 adopts a shell-and-tube heat exchanger.

[0071] The testing method of this embodiment is as follows:

[0072] The system is evacuated by the vacuum pump. When the internal pressure of the system is less than 50 Pa, the vacuum pump is turned off and ethanol is injected into the hot medium storage tank and the cold medium storage tank.

[0073] Start the circulation pump 4, and after the hot side circulating medium flows steadily, start the steam heater 5; the ethanol in the heat medium storage tank is pressurized by the circulation pump 1 and enters the steam heater to heat up to 80°C, and then enters the shell and tube heat exchanger to heat the cold side fluid. The cooled ethanol returns to the heat medium storage tank.

[0074] Turn on the circulation pump 2 13. The ethanol in the cold medium storage tank is pressurized by the circulation pump 2 and enters the thermostat for temperature adjustment. Then it enters the cold side channel of the shell and tube heat exchanger. The thermostat adjusts the cold side inlet temperature of the shell and tube heat exchanger to 30℃. After the system runs stably for 30 minutes, record the hot side inlet temperature of the shell and tube heat exchanger. T hi , hot side outlet temperature T ho , cold side inlet temperature T ci , cold side outlet temperature T co , and the circulation pump secondary circulation flow W c , calculate the logarithmic heat transfer temperature difference △T of the test heat exchanger, △T =(( T hi -T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), based on ethanol r c , specific heat Cp c ， Calculate the heat load of the test heat exchanger Q , Q = W c × r c × Cp c × ( T co -T ci ); According to the logarithmic heat transfer temperature difference of the heat exchanger △ T and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S).

[0075] This embodiment simulates and tests the operating conditions of a shell-and-tube ethanol solution regenerator.

[0076] Example 2

[0077] like Figure 2 As shown, in this embodiment, the cold medium circulation module is basically the same as that in Example 1, except that the cold side outlet of the heat exchange test module is no longer connected to the reflux port 3 of the cold medium storage tank 12, but is connected to the reflux port 2 of the cold medium storage tank 12. In addition, a gas-liquid separator 7 is added to the hot medium circulation module. The gas-liquid separator 7 has a feed port on its side wall, an air outlet on its top, and a liquid outlet on its bottom. The medium side outlet of the steam heater 5 is connected to the feed port on the side wall of the gas-liquid separator 7, the air outlet on the top of the gas-liquid separator 7 is connected to the hot side inlet of the heat exchange test module, and the liquid outlet at the bottom of the gas-liquid separator 7 is connected to the reflux port 2 of the hot medium storage tank 3.

[0078] This example simulates the operating conditions of a single-sided phase-change heat exchanger, with steam heating the hot side and methanol solution heating the cold side. The hot-side steam temperature is 100°C, and the cold-side methanol inlet temperature is 80°C. Test heat exchanger 1 uses a shell-and-tube heat exchanger, with the shell side serving as the hot medium channel and the tube side serving as the cold medium channel.

[0079] The testing method of this embodiment is as follows:

[0080] The system is evacuated by the vacuum pump. When the internal pressure of the system is less than 50 Pa, the vacuum pump is turned off, water is poured into the hot medium storage tank, and methanol is poured into the cold medium storage tank.

[0081] Start the circulation pump 4, and after the hot side circulating medium flows steadily, start the steam heater 5; the water in the heat medium storage tank is pressurized by the circulation pump 1 and then enters the steam heater to heat it to 100°C, maintaining the system pressure at 1 bar. The 100°C water vapor generated by the heating passes through the gas-liquid separator 1 and enters the shell and tube heat exchanger to heat the cold side methanol solution. After releasing heat, it condenses and liquefies, and then enters the tail cooler 1 for full condensation. The condensate flows back to the heat medium storage tank, and the system enters the next cycle; the non-condensable gas in the system is extracted from the system through the tail cooler 1 and the vacuum pump.

[0082] Turn on the circulation pump 2 13. The methanol in the cold medium storage tank is pressurized by the circulation pump 2 and enters the thermostat for temperature adjustment. Then it enters the shell and tube heat exchanger for heating and temperature increase. The thermostat is used to adjust the inlet temperature of the shell and tube heat exchanger to 80℃. After the system has been running stably for 30 minutes, the hot side inlet temperature of the test heat exchanger is recorded. T hi , hot side outlet temperature T ho , cold side inlet temperature T ci , cold side outlet temperature T co , and the circulation pump secondary circulation flow W c , calculate the logarithmic heat transfer temperature difference △T of the test heat exchanger, △T=(( T hi -T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), according to the density of methanol r c , specific heat Cp c , calculate the heat load of the test heat exchanger Q , Q = W c × r c × Cp c × ( T co -T ci ); According to the logarithmic heat transfer temperature difference of the heat exchanger △ T and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S).

[0083] This embodiment simulates and tests the operating conditions of a shell-and-tube methanol solution heater.

[0084] Example 3

[0085] like Figure 3As shown, in this embodiment, the heat medium circulation module is the same as that in Example 1, so it is not described in detail. Only a gas-liquid separator 2 9, a full condenser 2 10 and a metering tank 11 are added to the cold medium circulation module. The gas-liquid separator 2 9 is provided with a feed port on the side wall, an air outlet on the top, and a liquid outlet on the bottom. The cold side channel outlet of the heat exchange test module is connected to the feed port on the side wall of the gas-liquid separator 2 9, the air outlet on the top of the gas-liquid separator 2 9 is connected to the inlet of the full condenser 2 10, and the bottom outlet of the gas-liquid separator 2 9 is connected to the reflux port 2 of the cold medium storage tank 12. The outlet of the full condenser 2 10 is respectively connected to the metering tank 11 and the reflux port 1 of the cold medium storage tank 12. The full condenser 2 10 is connected to a cooling circuit formed by a cooling tower and a cooling water pump. The bottom outlet of the metering tank 11 is connected to the reflux port 1 of the cold medium storage tank 12, and the top air outlet of the metering tank 11 is connected to the air inlet of the tail cooler 2 8.

[0086] This embodiment simulates the operating conditions of a heat exchanger in which liquid is heated on the hot side and an organic liquid phase changes on the cold side, such as a water source heat pump evaporator or a low-temperature waste heat power generation (ORC) system evaporator. The test heat exchanger 1 uses a horizontal tube falling film heat exchanger with 60°C water on the hot side and 55°C Freon R134a on the cold side.

[0087] The testing method of this embodiment is as follows:

[0088] The system is evacuated by the vacuum pump. When the internal pressure of the system is less than 50 Pa, the vacuum pump is turned off, water is injected into the hot medium storage tank, and R134a is injected into the cold medium storage tank.

[0089] Start the circulation pump 4, and after the water flow stabilizes, start the steam heater 5; the water in the heat medium storage tank is pressurized by the circulation pump 1 and enters the steam heater to heat up to 60°C, and then enters the tube side of the horizontal tube falling film heat exchanger to heat the cold medium in the shell side. The cooled water returns to the heat medium storage tank.

[0090] Start circulating pump 2 13. The R134a in the cold medium storage tank is pressurized by circulating pump 2 and then enters the thermostat for temperature adjustment. It is then sprayed on the shell side of the horizontal tube falling film heat exchanger through the nozzle. The inlet temperature of the shell side of the horizontal tube falling film heat exchanger is adjusted to 55℃ through the thermostat to ensure the bubble point temperature for feeding. The system pressure is adjusted to 14.9 bar. After the system has been running stably for 30 minutes, the condensate at the outlet of the total condenser 2 is switched to the metering tank. The change in the liquid level in the metering tank corresponding to the measurement for 15 minutes is recorded. q v , through the latent heat of vaporization of Freon R134a at 55℃ h c and density r c , calculate the heat load of the test heat exchanger Q , Q =△q v × r c / t × h c , calculate the heat transfer coefficient of the test heat exchanger based on the logarithmic heat transfer temperature difference △T=5℃ and the heat transfer area S of the test heat exchanger A , A = Q / (△ T ×S).

[0091] This embodiment simulates and tests the operating conditions of a horizontal tube falling film evaporator of an R134a heat pump system.

[0092] Example 4

[0093] like Figure 4 As shown, in this embodiment, the heat medium circulation module is substantially the same as that in Example 2, except that the medium side outlet of the steam heater 5 is connected to the hot side inlet of the heat exchange test module and the side wall feed port of the gas-liquid separator 7 respectively. The cold medium circulation module is substantially the same as the cold medium circulation module in Example 3, except for some structural changes. Specifically, the cold medium circulation module further includes a gas-liquid separator 2 9, a full condenser 2 10 and a metering tank 11. The gas-liquid separator 2 9 is provided with a feed port on the side wall, an air outlet on the top, and a liquid outlet on the bottom. The cold side channel outlet of the heat exchange test module is respectively connected to the feed port on the side wall of the gas-liquid separator 2 9 and the reflux port 2 of the cold medium storage tank 12. The air outlet on the top of the gas-liquid separator 2 9 is connected to the inlet of the full condenser 2 10, and the bottom outlet of the gas-liquid separator 2 9 is connected to the reflux port 2 of the cold medium storage tank 12. The outlet of the full condenser 2 10 is respectively connected to the metering tank 11 and the reflux port 1 of the cold medium storage tank 12. The full condenser 2 10 is connected to a cooling circuit formed by a cooling tower and a cooling water pump. The bottom outlet of the metering tank 11 is connected to the reflux port 1 of the cold medium storage tank 12, and the top air outlet of the metering tank 11 is connected to the air inlet of the tail cooler 2 8.

[0094] This example simulates the operating conditions of a heat exchanger with a double-sided organic phase change, where the hot side condenses organic vapor and the cold side evaporates organic liquid, such as the bottom reboiler of a direct-pressure heat pump distillation system. The test heat exchanger 1 in this example uses a plate heat exchanger. The hot-side medium is 100% ethanol, and the cold-side medium is a 20% ethanol-water solution. The hot-side temperature is required to be 90°C, and the cold-side temperature is required to be 80°C.

[0095] The data acquisition and control module is connected to the heat exchange test module, the hot medium circulation module, the cold medium circulation module, and the auxiliary equipment module. It is used to collect relevant parameters such as temperature, pressure, and flow rate during the heat exchange test process, and to control the start and stop and frequency of power equipment such as circulation pump 1 4, circulation pump 2 13, and vacuum pump 17. The data acquisition and control module includes temperature sensors, pressure sensors, flow sensors, and a PLC controller 18. The PLC controller processes the collected data, calculates thermal performance parameters such as the single-side temperature change, heat transfer temperature difference, and heat transfer coefficient of the test heat exchanger, generates corresponding curves on the configuration interface, and archives the data.

[0096] The gas-liquid separators 1 and 2 are equipped with wire mesh demisters to remove gas-liquid entrainment and improve the system's condensate metering accuracy. The full condenser 1 and 2, 10, tail cooler 1 and 2, 8, and thermostat 14 all utilize fully welded plate heat exchangers. The circulating pumps 1 and 4, 13, and cooling water pump 16 can utilize explosion-proof chemical centrifugal pumps. The vacuum pump 17 utilizes an explosion-proof dry-type screw vacuum pump. The equipment and connecting pipes of the hot medium circulation module, cold medium circulation module, and heat exchange test module are all coated with an insulation layer.

[0097] The testing method of this embodiment is as follows:

[0098] The system was evacuated by the vacuum pump. When the internal pressure of the system was less than 50 Pa, the vacuum pump was turned off, 100% ethanol was poured into the hot medium storage tank, and 20% ethanol aqueous solution was poured into the cold medium storage tank.

[0099] Start the circulation pump 4, and after the hot side circulation medium flows steadily, start the steam heater 5; the hot circulation medium in the heat medium storage tank is pressurized by the circulation pump 1 and then enters the steam heater to heat up to 95°C, flashes in the gas-liquid separator 1 and realizes gas-liquid separation, the flash temperature is 90°C, and the unvaporized working medium flows back to the heat medium storage tank, the steam passes through the wire mesh to remove foam and enters the test heat exchanger, the 90°C ethanol vapor releases heat to the cold side and condenses and liquefies, and then enters the tail cooler 1 to be fully condensed, the condensate flows back to the heat medium storage tank, and the system enters the next cycle; the non-condensable gas in the system is extracted from the system through the tail cooler 1 and the vacuum pump, and the gas phase pressure in the system is controlled to be 1.58 bar through the valve opening.

[0100] Turn on the circulation pump 2 13. The 20% ethanol-water solution in the cold medium storage tank is pressurized by the circulation pump 2 and then enters the thermostat for temperature adjustment. It then enters the test heat exchanger 1. The ethanol-water solution after absorbing heat enters the gas-liquid separator 2 for gas-liquid separation. The unevaporated solution returns to the cold medium storage tank. The ethanol-rich vapor is separated from the entrained droplets by the wire mesh defoamer and then enters the full condenser 2 for cooling and condensation. The condensate returns to the cold medium storage tank. The system pressure is adjusted to 0.98 bar by the vacuum pump, and the cold side inlet temperature of the test heat exchanger is adjusted to 80°C by the thermostat, which meets the bubble point temperature for feeding. After the system has been running stably for 30 minutes, the condensate at the outlet of the full condenser 2 is switched to the metering tank, and the change in the metering tank level corresponding to the measurement for 15 minutes is recorded. q v , through the cold medium T c Latent heat of vaporization h c and density r c , calculate the heat load of the test heat exchanger Q , Q =△ q v × r c / t × h c , according to the logarithmic heat transfer temperature difference of the test heat exchanger △ T =10℃ and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S).

[0101] This example simulates the operating conditions of a direct compression ethanol heat pump distillation reboiler, and the heat transfer performance of a plate reboiler when the heat transfer temperature difference is 10°C.

[0102] The test heat exchanger of the present invention can be a shell and tube heat exchanger, a plate heat exchanger, a double-tube heat exchanger, a spiral plate heat exchanger, a plate and shell heat exchanger, an FC forced circulation heat exchanger, a vertical tube falling film heat exchanger, a horizontal tube falling film heat exchanger, a condenser, an evaporator, a reboiler, a regenerator, a preheater, a heater or a cooler.

[0103] The steam heater, full condenser 1, full condenser 2, tail cooler 1, tail cooler 2 and thermostat can adopt plate heat exchanger, shell and tube heat exchanger, spiral plate heat exchanger or shell and tube heat exchanger.

[0104] Circulation pump 1, circulation pump 2 and cooling water pump can adopt chemical centrifugal pump, axial flow pump, rotor pump or diaphragm pump and adopt explosion-proof motor.

[0105] Circulation pump 1 and circulation pump 2 can be frequency-controlled to adjust the circulation flow rate.

[0106] The gas-liquid separator 1 and the gas-liquid separator 2 are provided with a wire mesh demister inside to remove liquid droplets entrained in the gas phase and improve the test accuracy of the system condensate metering.

[0107] The vacuum pump adopts a dry screw vacuum pump and an explosion-proof motor.

[0108] The equipment and connecting pipes of the hot medium circulation module, cold medium circulation module, heat exchange test module are all covered with an insulation layer to prevent heat dissipation from affecting system test data.

[0109] Preferably, the temperature sensor, pressure sensor, flow sensor and PLC controller involved in the data acquisition and control module are all explosion-proof products.

[0110] It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0111] It should be noted that the terms used herein are intended only to describe specific embodiments and are not intended to limit the exemplary embodiments described herein. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0112] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0113] In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

[0114] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0115] In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless the context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0116] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A multifunctional organic heat transfer testing system, characterized by: It includes heat exchange test module, hot medium circulation module, cold medium circulation module, data acquisition control module and auxiliary equipment module; The heat exchange test module includes a test heat exchanger; The heat medium circulation module includes a full condenser, a heat medium storage tank, a circulation pump, a steam heater and a tail cooler; The cold medium circulation module includes a second tail cooler, a cold medium storage tank, a second circulation pump and a thermostat; The auxiliary equipment module includes a cooling tower, cooling water pump and vacuum pump; The data acquisition control module is connected to the heat exchange test module, the hot medium circulation module, the cold medium circulation module and the auxiliary equipment module. The data acquisition control module includes a temperature sensor, a pressure sensor, a flow sensor and a PLC controller; A discharge port is provided at the bottom of the heat medium storage tank, which is connected to an inlet of a circulating pump, an outlet of a circulating pump is connected to the medium side inlet of a steam heater, the medium side outlet of the steam heater is connected to the hot side inlet of a heat exchange test module, the hot side outlet of the heat exchange test module is connected to the inlet of a full condenser, an outlet of a full condenser is connected to a reflux port 1 at the top of the heat medium storage tank, the non-condensable gas outlet at the top of the heat medium storage tank is connected to an inlet of a tail cooler, and an outlet of a tail cooler is respectively connected to a vacuum pump and a reflux port 3 at the top of the heat medium storage tank; A discharge port is provided at the bottom of the cold medium storage tank, which is connected to the second inlet of the circulating pump, the second outlet of the circulating pump is connected to the inlet of the thermostat, the outlet of the thermostat is connected to the cold side inlet of the heat exchange test module, the cold side outlet of the heat exchange test module is connected to the reflux port 3 of the cold medium storage tank, the non-condensable gas outlet at the top of the cold medium storage tank is connected to the inlet of the second tail cooler, and the second outlet of the tail cooler is respectively connected to the vacuum pump and the reflux port 3 at the top of the cold medium storage tank; The first condenser, the first tail cooler and the second tail cooler are respectively connected to a cooling circuit formed by a cooling tower and a cooling water pump.

2. The multifunctional organic heat transfer testing system according to claim 1, characterized in that: The heat medium circulation module also includes a gas-liquid separator 1, a side wall of the gas-liquid separator is provided with a feed port, a top is provided with an air outlet, and a bottom is provided with a liquid outlet, the medium side outlet of the steam heater is connected to the side wall feed port of the gas-liquid separator 1, the air outlet at the top of the gas-liquid separator 1 is connected to the hot side inlet of the heat exchange test module, and the bottom liquid outlet of the gas-liquid separator 1 is connected to the reflux port 2 of the heat medium storage tank; In the cold medium circulation module, the cold side outlet of the heat exchange test module is no longer connected to the reflux port 3 of the cold medium storage tank, but is connected to the reflux port 2 of the cold medium storage tank.

3. The multifunctional organic heat transfer testing system according to claim 1, characterized in that: The cold medium circulation module also includes a gas-liquid separator 2, a full condenser 2 and a metering tank. The gas-liquid separator 2 is provided with a feed port on its side wall, an air outlet on its top and a liquid outlet on its bottom. The cold side outlet of the heat exchange test module is connected to the feed port on the side wall of the gas-liquid separator 2, the air outlet on the top of the gas-liquid separator 2 is connected to the inlet of the full condenser 2, the liquid outlet on the bottom of the gas-liquid separator 2 is connected to the reflux port 2 of the cold medium storage tank, the outlet of the full condenser 2 is respectively connected to the metering tank and the reflux port 1 of the cold medium storage tank, the full condenser 2 is connected to a cooling circuit formed by a cooling tower and a cooling water pump, the bottom outlet of the metering tank is connected to the reflux port 1 of the cold medium storage tank, and the air outlet on the top of the metering tank is connected to the air inlet of the tail cooler 2.

4. The multifunctional organic heat transfer testing system according to claim 1, characterized in that: The heat medium circulation module also includes a gas-liquid separator 1, a side wall of the gas-liquid separator is provided with a feed port, a top is provided with an air outlet, and a bottom is provided with a liquid outlet, the medium side outlet of the steam heater is respectively connected to the hot side inlet of the heat exchange test module and the side wall feed port of the gas-liquid separator 1, the air outlet at the top of the gas-liquid separator 1 is connected to the hot side inlet of the heat exchange test module, and the bottom liquid outlet of the gas-liquid separator 1 is connected to the reflux port 2 of the heat medium storage tank; The cold medium circulation module also includes a gas-liquid separator 2, a full condenser 2 and a metering tank. The gas-liquid separator 2 is provided with a feed port on its side wall, an air outlet on its top and a liquid outlet on its bottom. The outlet of the cold side channel of the heat exchange test module is respectively connected to the feed port on the side wall of the gas-liquid separator 2 and the reflux port 2 of the cold medium storage tank. The air outlet on the top of the gas-liquid separator 2 is connected to the inlet of the full condenser 2, and the liquid outlet on the bottom of the gas-liquid separator 2 is connected to the reflux port 2 of the cold medium storage tank. The outlet of the full condenser 2 is respectively connected to the metering tank and the reflux port 1 of the cold medium storage tank. The full condenser 2 is connected to a cooling circuit formed by a cooling tower and a cooling water pump. The bottom outlet of the metering tank is connected to the reflux port 1 of the cold medium storage tank, and the air outlet on the top of the metering tank is connected to the air inlet of the tail cooler 2.

5. A multifunctional organic heat transfer testing system according to claim 2 or 4, characterized in that: The PLC controller processes the data collected by the temperature sensor, pressure sensor, and flow sensor to calculate the thermal performance parameters of the test heat exchanger. A wire mesh demister is provided inside the gas-liquid separator to remove liquid droplets entrained in the gas phase.

6. A multifunctional organic heat transfer testing system according to claim 3 or 4, characterized in that: The PLC controller processes the data collected by the temperature sensor, pressure sensor, and flow sensor to calculate the thermal performance parameters of the test heat exchanger. A wire mesh demister is provided inside the gas-liquid separator 2 to remove liquid droplets entrained in the gas phase.

7. A testing method applied to the testing system of claim 1, characterized in that: The following steps are involved: S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively; S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and then enters the steam heater for heating before entering the test heat exchanger. The cooled heat medium enters the full condenser 1 and then returns to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump. The test pressure is regulated by the vacuum pump. S3: Start the circulation pump 2. The cold circulating medium enters the thermostat for cooling and then enters the test heat exchanger. The heated cold medium returns to the cold medium storage tank. After 30 minutes of stable operation, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △T =(( T hi - T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), according to the cold medium flow W c ,density ρ c , specific heat Cp c , calculate the heat load of the test heat exchanger Q , Q = W c × ρ c × Cp c × ( T co -T ci ), according to △ T and heat exchange area S , calculate the heat transfer coefficient A , A = Q / (△ T ×S); S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel; S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

8. A testing method applied to the testing system of claim 2, characterized in that: The following steps are involved: S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively; S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and enters the steam heater. It flashes and separates gas and liquid in the gas-liquid separator 1. The unvaporized portion flows back to the heat medium storage tank. The steam passes through the wire mesh to remove foam and enter the test heat exchanger. After releasing heat, the unliquefied portion enters the full condenser 1 for condensation and flows back to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump. S3: Start the circulation pump 2. The cold circulating medium enters the thermostat for cooling and then enters the test heat exchanger. The heated cold medium returns to the cold medium storage tank. After 30 minutes of stable operation, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △T =(( T hi -T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), according to the cold medium flow W c ,density ρ c , specific heat Cp c , calculate the heat load of the test heat exchanger Q , Q = W c × ρ c × Cp c × ( T co -T ci ), according to △ T and heat exchange area S , calculate the heat transfer coefficient A , A = Q / (△ T ×S); S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel; S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

9. A testing method applied to the testing system of claim 3, characterized in that: The following steps are involved: S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively; S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and then enters the steam heater for heating before entering the test heat exchanger. The cooled heat medium enters the full condenser 1 and then returns to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump. S3: Start the circulation pump 2. The cold circulation medium enters the thermostat for cooling and then enters the test heat exchanger for gas-liquid separation. The cold medium returns to the cold medium storage tank. The steam passes through the wire mesh to separate the entrained droplets and then enters the total condenser 2 for condensation and then returns to the cold medium storage tank. After stable operation for 30 minutes, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △T =(( T hi -T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), switch the condensate from the second outlet of the condenser to the metering tank and record the time period t and the liquid level change of the metering tank q v , latent heat of vaporization when passing through cold medium h c and density ρ c , calculate the heat load of the test heat exchanger Q , Q =△ q v × ρ c / t × h c , according to △ T and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S); S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel; S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

10. A testing method applied to the testing system of claim 4, characterized in that: The following steps are involved: S1: Evacuate the system until the internal pressure is less than 50Pa, then pour cold and hot circulating media into the storage tanks respectively; S2: Start the circulation pump 1. After the heat circulation medium flows steadily, start the steam heater. The heat circulation medium is pressurized by the circulation pump 1 and enters the steam heater. It flashes in the gas-liquid separator 1 to achieve gas-liquid separation. The unvaporized part flows back to the heat medium storage tank. The steam passes through the wire mesh to remove foam and enters the test heat exchanger. The steam is condensed in the full condenser 1 and flows back to the heat medium storage tank. The non-condensable gas enters the tail cooler 1 and is extracted by the vacuum pump. S3: Start the circulation pump 2. The cold circulation medium enters the thermostat for cooling and then enters the test heat exchanger for gas-liquid separation. The cold medium returns to the cold medium storage tank. The steam passes through the wire mesh to separate the entrained droplets and then enters the total condenser 2 for condensation and then returns to the cold medium storage tank. After stable operation for 30 minutes, record the hot side inlet temperature of the test heat exchanger. T hi and hot side outlet temperature T ho , cold side inlet temperature T ci and cold side outlet temperature T co , calculate the logarithmic heat transfer temperature difference of the test heat exchanger △T , △T =(( T hi -T co )-( T ho -T ci )) / ln(( T hi -T co ) / ( T ho -T ci )), switch the condensate from the second outlet of the condenser to the metering tank and record the time period t and the liquid level change of the metering tank q v , latent heat of vaporization when passing through cold medium h c and density ρ c , calculate the heat load of the test heat exchanger Q , Q =△ q v × ρ c / t × h c , according to △ T and heat exchange area S , calculate the heat transfer coefficient of the test heat exchanger A , A = Q / (△ T ×S); S4: determining the hot side pressure drop according to the inlet and outlet pressure difference of the hot side flow channel, and determining the cold side pressure drop according to the inlet and outlet pressure difference of the cold side flow channel; S5: Change the flow rate of the cold / hot medium, change the heat transfer temperature difference, and test again.

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