Frosting experiment table and method

Abstract

The invention belongs to the technical field of experimental equipment, and relates to a frosting experiment table and method. The device comprises an air duct cavity, an axial flow fan, a flow equalizing plate, a camera unit, a heat exchanger, a temperature monitoring and adjusting unit, a humidity monitoring and adjusting unit, an air speed and air pressure monitoring unit and a rotation driving unit, and can accurately and stably simulate complex and changeable actual working conditions including frosting conditions under different temperature, humidity, air speed, air pressure and air direction conditions. Meanwhile, key parameters such as temperature, humidity, wind speed, wind pressure and frosting thickness in the frosting process can be comprehensively obtained, the accuracy and timeliness of experimental data can be improved, and reliable data support is provided for frosting research. In addition, due to the introduction of the camera shooting unit, the experiment table can record microscopic changes in the frosting process, and visual and accurate image data are provided for deep analysis of a frosting mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of experimental equipment and relates to a frosting experimental table and a method. Background Art

[0002] Frosting is a common problem in many fields such as refrigeration, air conditioning, and cryogenics. Frosting not only increases thermal resistance and reduces heat transfer efficiency, but also may affect the normal operation of equipment, leading to energy waste and equipment failure.

[0003] Currently, frosting research equipment faces numerous limitations. When it comes to simulating experimental environments, most existing test benches struggle to accurately and stably simulate complex and variable real-world operating conditions. Some equipment only offers simple temperature adjustments, failing to precisely control humidity, wind speed, wind pressure, and wind direction simultaneously. This makes it impossible to simulate frosting conditions in extreme environments like high humidity and low wind speeds. Furthermore, environmental parameters fluctuate significantly. For example, temperature control often only achieves an accuracy of ±2-3°C, failing to meet the demands for high-precision research into frosting processes.

[0004] Existing measurement methods are unable to fully capture key parameters during the frosting process. Traditional temperature sensors have a slow response speed, making it difficult to capture the rapid temperature changes during the initial stages of frosting. Humidity measurement instruments have limited accuracy, with errors reaching ±5%-10% in high humidity environments, making them unable to accurately reflect subtle humidity changes during the frosting process. Furthermore, there is a lack of effective real-time measurement methods for important parameters such as frost thickness during the frosting process. These parameters can only be obtained through indirect calculation or post-measurement, resulting in poor data accuracy and timeliness.

[0005] Observation methods are also relatively backward. Most experiments rely solely on visual observation of frost formation, making it difficult to record microscopic changes during the frost formation process. The lack of high-resolution, real-time observation equipment prevents in-depth analysis of microscopic processes such as frost nucleation and growth, hindering further research into the mechanisms of frost formation.

[0006] In summary, existing frosting research experiments have problems such as single working condition simulation, poor accuracy and timeliness of data measurement, and backward observation and recording methods. Summary of the Invention

[0007] The purpose of the present invention is to provide a frosting test bench and method to solve the technical problems of existing frosting research experiments, such as single working condition simulation, poor accuracy and timeliness of data measurement, and backward observation and recording methods.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a frosting test bench, comprising an air duct cavity, an axial flow fan being provided at the entrance of the air duct cavity, a flow equalizing plate, a camera unit, a heat exchanger, a temperature monitoring and adjustment unit, a humidity monitoring and adjustment unit, and a wind speed and pressure monitoring unit being provided in the air duct cavity, the flow equalizing plate, the camera unit, the temperature monitoring and adjustment unit, the humidity monitoring and adjustment unit, and the wind speed and pressure monitoring unit being located between the axial flow fan and the heat exchanger, and the heat exchanger being respectively connected to a low-temperature coolant circulation tank and a constant temperature water bath; The heat exchanger is rotatably connected to the air duct cavity. A rotation drive unit is provided on the air duct cavity. The rotation drive unit is connected to the heat exchanger and is used to drive the heat exchanger to rotate.

[0009] Furthermore, a detachable section is detachably provided on the air duct cavity, the interior of the detachable section is connected to the interior of the air duct cavity, the connection between the detachable section and the air duct cavity is sealed, the rotation drive unit is fixedly provided on the detachable section, and the heat exchanger is located in the detachable section.

[0010] Furthermore, a detachable groove is provided on the air duct cavity, the detachable section is connected to the air duct cavity via the detachable groove, and a sealing component is provided between the detachable groove and the detachable section.

[0011] Furthermore, the wind speed and wind pressure monitoring unit includes an anemometer, an electric regulating valve for the air duct and a high-precision pressure sensor. The electric regulating valve for the air duct is located between the axial flow fan and the flow equalizing plate, and the anemometer and the high-precision pressure sensor are located between the flow equalizing plate and the heat exchanger.

[0012] Furthermore, the humidity monitoring and regulating unit includes a temperature and humidity measuring instrument, a humidifying unit and a dehumidifying device, and the humidifying unit and the dehumidifying device are both located between the axial flow fan and the flow equalizing plate.

[0013] Furthermore, the temperature monitoring and regulating unit includes a heating unit and a constant temperature controller, the heating unit is located between the axial flow fan and the flow equalizing plate, and the constant temperature controller is located between the flow equalizing plate and the heat exchanger.

[0014] Furthermore, the rotation drive unit includes a drive motor and a rotating shaft, the heat exchanger is fixedly connected to the rotating shaft, the rotating shaft is rotationally connected to the air duct cavity, and the output end of the drive motor is connected to the rotating shaft through a transmission unit.

[0015] Furthermore, the outlet of the heat exchanger is connected to the inlet of the low-temperature coolant circulation tank and the inlet of the constant temperature water bath respectively through a first control valve. A circulation pump is provided at the inlet of the heat exchanger. The outlet of the low-temperature coolant circulation tank is connected to the inlet of the circulation pump through a second control valve, and the outlet of the constant temperature water bath is connected to the inlet of the circulation pump through a third control valve.

[0016] Furthermore, the outlet of the first control valve is connected to the inlet of the low-temperature coolant circulation tank through a refrigerant pipeline, and the outlet of the first control valve is connected to the inlet of the constant temperature water bath through a heat flow pipeline. A heat flux density sensor, a flow sensor and a pressure sensor are provided on the refrigerant pipeline and the heat flow pipeline.

[0017] Based on the above structure, the present invention also discloses a frosting test method, comprising the following steps: Start the axial flow fan, monitor the wind speed and pressure in the air duct cavity according to the wind speed and pressure monitoring unit, and adjust the air outlet speed and pressure of the axial flow fan according to the monitoring data; Using the temperature monitoring and regulation unit to monitor and regulate the temperature in the air duct cavity; Monitor and adjust the humidity in the air duct cavity using a humidity monitoring and adjustment unit; The angle of the heat exchanger is adjusted by using the rotation drive unit to change the angle between the heat exchanger surface and the wind direction; The frosting experiment was conducted by changing the temperature and flow rate of the medium entering the heat exchanger through the low-temperature coolant circulation tank; The temperature and flow rate of the medium entering the heat exchanger from the constant temperature water bath were changed to conduct frost melting experiments; A comprehensive frosting experiment was conducted by replacing heat exchangers with different surface coatings and changing the speed, wind pressure, temperature and humidity.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The air duct cavity of the present invention is used to provide an experimental space isolated from the outside world, which helps reduce external environmental interference and enhances experimental stability. The axial flow fan provides a stable airflow to the air duct cavity. By adjusting the speed of the axial flow fan, the wind speed and pressure within the air duct can be precisely controlled, thereby simulating frosting conditions under different environments. The flow equalizer is used to evenly distribute the airflow, reducing turbulence and eddies within the air duct, and ensuring the consistency and stability of the experimental environment. The camera unit is used for real-time recording and observation, capable of capturing microscopic changes during the frosting process. The heat exchanger is connected to a low-temperature coolant circulation tank and a constant temperature water bath, allowing the heat exchanger temperature to be precisely controlled, thereby simulating frosting conditions under different temperature conditions. The temperature monitoring and regulation unit is used to monitor and regulate the temperature within the air duct in real time, ensuring the accuracy and stability of temperature control. The humidity monitoring and regulation unit is used to monitor and regulate the humidity within the air duct in real time, ensuring the accuracy and stability of humidity control. The wind speed and pressure monitoring unit is used to monitor the wind speed and pressure within the air duct in real time, ensuring the accuracy and stability of wind speed and pressure control. The rotary drive unit is used to drive the heat exchanger to rotate, thereby simulating the frosting process under different wind directions, which increases the diversity and flexibility of the experiment. The present invention can accurately and stably simulate complex and changeable actual working conditions, including frosting conditions under different temperature, humidity, wind speed, wind pressure and wind direction conditions. At the same time, it can comprehensively obtain key parameters in the frosting process, such as temperature, humidity, wind speed, wind pressure and frosting thickness, which helps to improve the accuracy and timeliness of experimental data and provide reliable data support for frosting research. In addition, the introduction of the camera unit enables the experimental platform to record microscopic changes in the frosting process, providing intuitive and accurate image data for in-depth analysis of the frosting mechanism.

[0019] The method of the present invention integrates multiple influencing factors such as speed, wind pressure, temperature, humidity, wind direction, and heat exchanger surface coating. The data is diverse and the data acquisition is more timely and effective, which is conducive to a more comprehensive and accurate study of the frosting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the embodiment disclosed in the present invention; Figure 2 The present invention discloses a method flow chart of an embodiment.

[0021] Among them: 1. Axial fan; 2. Heating unit; 3. Flow equalizer; 4. Camera unit; 5. Anemometer; 6. Constant temperature controller; 7. Temperature and humidity measuring instrument; 8. Heat exchanger; 9. Low-temperature coolant circulation tank; 10. Constant temperature water bath; 11. Circulation pump; 12. Computer; 13. Data transmission equipment; 14. First control valve; 15. Refrigerant pipeline; 16. Heat flow pipeline; 17. Duct electric regulating valve; 18. High-precision pressure sensor; 19. Drive motor; 20. Removable channel; 21. Duct cavity; 22. Removable section; 23. Second control valve; 24. Temperature monitoring and adjustment unit; 25. Humidity monitoring and adjustment unit; 26. Wind speed and pressure monitoring unit; 27. Rotation drive unit; 28. Third control valve. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," and the like in the description of the present invention 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 so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0024] The present invention is described in further detail below with reference to the accompanying drawings: See also Figure 1The present invention discloses a frosting test bench, including an air duct cavity 21, wherein the air duct cavity 21 is used to provide an experimental space isolated from the outside world, which is conducive to reducing external environmental interference and facilitating the stability of the experiment. An axial flow fan 1 is provided at the entrance of the air duct cavity 21, and the axial flow fan 1 provides a stable airflow for the air duct cavity 21. By adjusting the rotation speed of the axial flow fan 1, the wind speed and wind pressure in the air duct can be accurately controlled, thereby simulating frosting conditions under different environments. A flow equalizing plate 3, a camera unit 4, a heat exchanger 8, a temperature monitoring and adjustment unit 24, a humidity monitoring and adjustment unit 25, and a wind speed and wind pressure monitoring unit 26 are provided in the air duct cavity 21. The flow equalizing plate 3, the camera unit 4, the temperature monitoring and adjustment unit 24, the humidity monitoring and adjustment unit 25, and the wind speed and wind pressure monitoring unit 26 are located between the axial flow fan 1 and the heat exchanger 8. The heat exchanger 8 is respectively connected to a low-temperature coolant circulation tank 9 and a constant temperature water bath 10. The flow equalizer 3 is used to evenly distribute the airflow, reduce the turbulence and eddy currents in the air duct, and ensure the consistency and stability of the experimental environment. The camera unit 4 is used for real-time recording observation, which can capture microscopic changes in the frosting process, such as nucleation, growth, frost thickness, etc. Since the heat exchanger 8 is facing the camera unit 4, the frost thickness on the surface of the heat exchanger 8 can be obtained using the camera unit 4. The heat exchanger 8 can accurately control the temperature of the heat exchanger by connecting the low-temperature coolant circulation tank 9 and the constant temperature water bath 10, thereby simulating the frosting conditions under different temperature conditions. The temperature monitoring and adjustment unit 24 is used to monitor and adjust the temperature in the air duct in real time to ensure the accuracy and stability of temperature control. The humidity monitoring and adjustment unit 25 is used to monitor and adjust the humidity in the air duct in real time to ensure the accuracy and stability of humidity control. The wind speed and pressure monitoring unit 26 is used to monitor the wind speed and pressure in the air duct in real time to ensure the accuracy and stability of wind speed and pressure control.

[0025] The heat exchanger 8 is rotatably connected to the air duct cavity 21. The air duct cavity 21 is provided with a rotation drive unit 27. The rotation drive unit 27 is connected to the heat exchanger 8 and is used to rotate the heat exchanger 8. The rotation drive unit 27 is used to rotate the heat exchanger 8, thereby simulating the frosting process under different wind directions, increasing the diversity and flexibility of the experiment.

[0026] The frosting test bench of the present invention can accurately and stably simulate complex and changeable actual working conditions, including frosting conditions under different temperature, humidity, wind speed, wind pressure and wind direction conditions, by integrating components such as an axial flow fan 1, a flow equalizing plate 3, a heat exchanger 8, a temperature monitoring and adjustment unit 24, a humidity monitoring and adjustment unit 25, and a wind speed and wind pressure monitoring unit 26. At the same time, it can comprehensively obtain key parameters in the frosting process, such as temperature, humidity, wind speed, wind pressure, and frosting thickness, which helps to improve the accuracy and timeliness of experimental data and provide reliable data support for frosting research. In addition, the introduction of the camera unit enables the test bench to record microscopic changes in the frosting process, providing intuitive and accurate image data for in-depth analysis of the frosting mechanism.

[0027] In an embodiment of the present invention, a detachable section 22 is detachably provided on the air duct cavity 21, the interior of the detachable section 22 is connected to the interior of the air duct cavity 21, the connection between the detachable section 22 and the air duct cavity 21 is sealed, the rotation drive unit 27 is fixedly provided on the detachable section 22, and the heat exchanger 8 is located in the detachable section 22.

[0028] In the embodiment of the present invention, a detachable groove 20 is provided on the air duct cavity 21 , the detachable section 22 is connected to the air duct cavity 21 via the detachable groove 20 , and a sealing component is provided between the detachable groove 20 and the detachable section 22 .

[0029] In an embodiment of the present invention, the wind speed and wind pressure monitoring unit 26 includes an anemometer 5, an air duct electric regulating valve 17 and a high-precision pressure sensor 18. The air duct electric regulating valve 17 is located between the axial flow fan 1 and the flow equalizing plate 3. The anemometer 5 and the high-precision pressure sensor 18 are located between the flow equalizing plate 3 and the heat exchanger 8.

[0030] In the embodiment of the present invention, the humidity monitoring and regulating unit 25 includes a temperature and humidity measuring instrument 7 , a humidifying unit and a dehumidifying device. The humidifying unit and the dehumidifying device are both located between the axial flow fan 1 and the flow equalizing plate 3 .

[0031] In an embodiment of the present invention, the temperature monitoring and adjustment unit 24 includes a heating unit 2 and a constant temperature controller 6, the heating unit 2 is located between the axial fan 1 and the flow equalizing plate 3, and the constant temperature controller 6 is located between the flow equalizing plate 3 and the heat exchanger 8.

[0032] In an embodiment of the present invention, the rotation drive unit 27 includes a drive motor 19 and a rotating shaft. The heat exchanger 8 is fixedly connected to the rotating shaft. The rotating shaft is rotationally connected to the air duct cavity 21. The output end of the drive motor 19 is connected to the rotating shaft through a transmission unit.

[0033] In an embodiment of the present invention, the outlet of the heat exchanger 8 is connected to the inlet of the low-temperature coolant circulation tank 9 and the inlet of the constant temperature water bath 10 respectively through the first control valve 14. A circulation pump 11 is provided at the inlet of the heat exchanger 8. The outlet of the low-temperature coolant circulation tank 9 is connected to the inlet of the circulation pump 11 through the second control valve 23, and the outlet of the constant temperature water bath 10 is connected to the inlet of the circulation pump 11 through the third control valve 28.

[0034] In an embodiment of the present invention, the outlet of the first control valve 14 is connected to the inlet of the low-temperature coolant circulation tank 9 through a refrigerant pipeline 15, and the outlet of the first control valve 14 is connected to the inlet of the constant temperature water bath 10 through a heat flow pipeline 16. A heat flux density sensor, a flow sensor and a pressure sensor are provided on the refrigerant pipeline 15 and the heat flow pipeline 16.

[0035] Based on the above structure, the present invention also discloses a frosting test method, see Figure 2 , including the following steps: S1, start the axial flow fan 1, monitor the wind speed and pressure in the air duct cavity 21 according to the wind speed and pressure monitoring unit 26, and adjust the air outlet speed and pressure of the axial flow fan 1 according to the monitoring data; S2, using the temperature monitoring and regulating unit 24 to monitor and regulate the temperature in the air duct cavity 21; S3, using the humidity monitoring and adjustment unit 25 to monitor and adjust the humidity in the air duct cavity 21; S4, using the rotation drive unit 27 to adjust the angle of the heat exchanger 8 to change the angle between the surface of the heat exchanger 8 and the wind direction; S5, changing the temperature and flow rate of the medium entering the heat exchanger 8 through the low-temperature coolant circulation tank 9 to perform a frosting experiment; S6, changing the temperature and flow rate of the medium entering the heat exchanger 8 in the constant temperature water bath 10 to perform a frost melting experiment; S7, replace the heat exchanger 8 with a different surface coating, and change the speed, wind pressure, temperature and humidity to conduct a comprehensive frosting experiment.

[0036] The method of the present invention integrates multiple influencing factors such as speed, wind pressure, temperature, humidity, wind direction, and surface coating of the heat exchanger 8. The data is diverse and the data acquisition is more timely and effective, which is conducive to a more comprehensive and accurate study of the frosting process.

[0037] Example 2: See also Figure 1 ,This embodiment provides a frosting experimental platform that can accurately simulate different environmental conditions, realize multi-parameter measurement and intuitive observation of the frosting process, and provide a more reliable experimental platform for the study of frosting phenomena.

[0038] The present invention provides a frosting observation experimental platform, comprising an axial flow fan 1, a heating unit 2, a flow equalizing plate 3, an anemometer 5, a constant temperature controller 6, a camera unit 4, a low-temperature coolant circulation tank 9, a constant temperature water bath 10, an air duct electric regulating valve 17, a high-precision pressure sensor 18, a drive motor 19, a detachable channel 20 and a sealing gasket.

[0039] Environmental simulation system: The test bench is located in a high-efficiency enthalpy difference laboratory. The required ambient temperature and humidity are set at the beginning of the experiment. At the same time, a heating unit 2 and a constant temperature controller 6 are set. Under the control of the constant temperature controller 6, the heating unit 2 can heat up or fine-tune the temperature of the experimental space to ensure that the experimental environment temperature is stable at the set value.

[0040] Frost and defrost system: After the ambient temperature and humidity reach the set operating conditions and stabilize for a period of time, the low-temperature coolant circulation tank 9 is set and opened, allowing the heat exchanger 8 to exchange heat with the low-temperature air. When frosting conditions are reached, the low temperature on the surface of the heat exchanger 8 causes water vapor to condense into frost. During defrost, the heating unit 2 is activated to raise the air temperature. Simultaneously, the constant-temperature water bath 10 is opened, and the four-way reversing valve switches the pipeline, causing the control system to adjust the heat medium flow in the heat flow pipeline 16 to increase the temperature of the heat exchanger 8. Under the influence of the appropriate temperature and airflow, the frost layer gradually melts.

[0041] Air flow system: Axial fan 1 generates stable air flow. The air duct electric control valve 17, in conjunction with a high-precision pressure sensor 18, precisely regulates the ambient air pressure within a certain range. A flow equalizer 3 evenly distributes air throughout the experimental area, ensuring uniform wind speed. An anemometer 5 measures wind speed in real time, allowing the fan's speed to be adjusted based on experimental requirements and simulating frosting under varying wind speeds.

[0042] Measurement and Observation System: A temperature and humidity measuring instrument 7 monitors the experimental environment's temperature and humidity in real time. Heat flow pipe 16 and refrigerant pipe 15, coupled with corresponding sensors, measure heat flow and refrigerant parameters, providing data support for studying heat transfer and material exchange during the frosting process. A camera unit 4 is used to capture the frosting process, facilitating intuitive observation of its initiation, development, and changes. Combined with a data acquisition system, it can record data and images from the entire experimental process, providing a basis for subsequent analysis. In this embodiment, a high-speed camera is used as the camera unit 4.

[0043] Motor-driven rotatable heat exchanger adjustment system: The rotating shaft of the drive motor 19 drives the heat exchanger 8 in the middle of the detachable section 22. The rotation angle range of the heat exchanger 8 is adjusted by the drive motor 19. The rotation angle range is 0° to 180°, and 90° is vertical to the wind, which is used to study the frost distribution under different airflow impact angles.

[0044] Surface Coating Replacement System: The frost observation section of the test bench is designed as a removable modular component, utilizing removable channels 20 to enable rapid removal and installation of heat exchangers 8 with different surface coatings. A silicone rubber sealing gasket is installed at the interface between the removable section 22 and the air duct cavity 21 to ensure airtightness within the experimental measurement section after replacement, specifically between the removable section and the air duct cavity.

[0045] Piping and Control Components: Control valves installed on heat flow pipe 16 and refrigerant pipe 15 regulate fluid flow and pressure, enabling precise control of heat and refrigerant circulation during the experiment. A computer, serving as the control core, receives data from various measuring instruments and, according to pre-set programs, controls the operation of equipment such as heating unit 2, thermostat 6, axial fan 1, and control valves, achieving automated control of the experimental process.

[0046] Based on the above structure, the experimental process of the present invention is as follows: S1. Pre-experimental preparation and environmental simulation initiation: Based on the research objectives, determine the environmental conditions required for the experiment, including target temperature, humidity, wind speed, wind direction, and wind pressure. Open the enthalpy difference laboratory and, in the control software interface of computer 12, input the relevant experimental environmental parameters through data transmission device 13. For example, to simulate a low-temperature environment of -10°C with 80% relative humidity and vertical wind direction, first set the enthalpy difference laboratory temperature and humidity to the target values. Set heating unit 2 and thermostat 6. Under the control of thermostat 6, heating unit 2 can increase or fine-tune the experimental space to ensure that the experimental environment temperature remains stable at the set value. Heating unit 2 and thermostat 6 monitor the experimental area temperature in real time. If the temperature falls below the desired experimental value, thermostat 6 will control heating unit 2 to start heating appropriately to ensure that the experimental area temperature remains stable near the set low temperature. Set the target temperatures for constant temperature water bath 10 and low-temperature coolant circulation tank 9 and allow them to begin operating according to the set parameters. The low-temperature coolant circulation tank 9 provides the primary cooling capacity, delivering the coolant to the experimental bench's heat exchanger 8 for frosting. Its temperature is set to the experimental value, such as around -15°C. The constant-temperature water bath 10 is set to the desired defrosting temperature, such as 40°C, for defrosting. Furthermore, the maximum and minimum heating power thresholds for heating unit 2, as well as the temperature control accuracy of the thermostat controller, are set based on experimental requirements. The accuracy can generally be set to ±0.5°C.

[0047] S2, air flow control: Start the axial flow fan 1, and control its speed and air pressure through the computer 12 and the air duct electric control valve 17. For example, if the experiment needs to simulate a wind speed and pressure of 3m / s and 110kPa, first use the relevant program software of the computer 12 to accurately calculate the required valve opening and fan power, set the speed of the axial flow fan 1 to the estimated value, and set the air duct electric control valve 17 to the predetermined opening. Then, use the anemometer 5 to measure the wind speed at different locations in the experimental area in real time, and use the high-precision pressure sensor 18 to measure the pressure on the windward side of the heat exchanger in the experimental air duct in real time. Due to the action of the flow equalizer 3, the wind speed in the experimental area will tend to be uniform, but there may still be deviations from the target wind speed. Based on the data fed back by the anemometer 5, fine-tune the speed of the axial flow fan 1 and the opening of the air duct electric control valve 17 until the wind speed and pressure at each measurement point in the experimental area stabilize to the target set value, with the error controlled within the range of ±0.2m / s and ±0.5kPa.

[0048] S3, wind direction adjustment: The direction of the heat exchanger 8 can be adjusted by using the drive motor 19 to simulate the experimental working conditions of different wind directions blowing on the surface of the heat exchanger 8. For example, to make the surface of the heat exchanger 8 receive the wind vertically, adjust the motor parameters to rotate the shaft to 90°.

[0049] S4, Temperature and Humidity Control: The temperature and humidity of the experimental environment are monitored in real time using a temperature and humidity meter 7. If the humidity falls below the experimental requirements, an appropriate amount of water is added to the humidification unit installed in the experimental table. The humidity is increased by controlling the humidification unit's operating time and power. If the humidity exceeds the target value, the dehumidification device is activated for dehumidification. During the humidity adjustment process, the temperature and humidity meter 7 continuously provides feedback. Computer 12 uses this data to adjust the operating status of the humidification unit or dehumidification device in real time to maintain the temperature and humidity within the set range, for example, the temperature is controlled at -10°C ± 0.5°C and the humidity is controlled at 85% ± 3%.

[0050] S5, surface coating replacement: When a set of experiments is completed and the same working conditions experiments are prepared for heat exchangers 8 with different surface properties, the detachable section 22 is removed using the detachable groove 20 and replaced with a heat exchanger 8 with another surface property, such as a super-hydrophobic surface heat exchanger. The heat exchanger 8 is installed and connected to the rotating shaft of the drive motor 19, and the detachable section 22 is reinstalled. The silicone rubber sealing gasket is checked for integrity and the air pressure control system is checked to ensure that the experimental measurement section is airtight after the cavity is replaced.

[0051] S6, monitoring and recording the experimental process: Turn on the camera unit 4, adjust the shooting angle and parameters, and ensure that the frosting process in the experimental area can be clearly captured. The camera unit 4 continuously shoots at a certain frame rate, such as 50 frames per second, recording the starting moment of frosting, the location of ice crystal formation, and the gradual spread and thickening of frosting. At the same time, sensors on the heat flow pipe 16 and the refrigerant pipe 15 collect data such as heat flux density, refrigerant flow rate, and pressure in real time, and transmit this data to the computer 12. The computer 12 synchronously stores the image data captured by the camera unit and the data collected by each sensor to establish a complete experimental database.

[0052] S7, Experimental Condition Adjustment: During the experiment, computer-controlled control valves are used to adjust the flow and pressure in heat flow pipe 16 and refrigerant pipe 15 according to research needs. For example, after the frosting process has progressed for a period of time, to study the effect of varying the heat flux density on the frosting rate, the flow rate of the heat medium in heat flow pipe 16 can be gradually reduced to lower the heat flux density. During this process, the images captured by the camera unit 4 and the changes in the data from various sensors are closely observed, and changes in the frosting rate, frosting morphology, and other aspects are recorded.

[0053] S8, end of experiment and data analysis: When the predetermined experimental time is reached or a specific phenomenon is observed in the frosting process, such as when the frosting reaches a stable state, the experiment is stopped. Turn off the constant temperature water bath 10, low-temperature coolant circulation tank 9, axial flow fan 1, heating unit 2, camera unit 4, and various measuring instruments. Organize and analyze the experimental data stored in the computer 12, and use professional data processing software to draw a curve of frost thickness change over time, a graph of the relationship between frost rate and environmental parameters, etc. Combined with the images captured by the camera unit 4, the influence of different environmental conditions and parameter changes on the frosting process is deeply studied from a macroscopic and microscopic perspective, and the frosting laws are summarized to provide a theoretical basis and data support for solving frosting problems in related fields.

[0054] In terms of simulating the frosting experimental environment, the present invention can accurately and stably simulate complex and changeable actual working conditions. It can accurately control temperature, humidity, wind speed, wind direction and wind pressure to simulate frosting conditions in extreme environments such as high humidity and low wind speed. This experimental platform can meet the needs of high-precision research on the frosting process. The experimental platform has a drive motor 19, which is combined with a heat exchanger 8 to study the frosting distribution under different airflow impact angles. The surface coating replacement system can meet the needs of rapid disassembly and installation of heat exchangers 8 with different surface coatings. In terms of measurement technology, important parameters such as frost thickness in the frosting process can be measured in real time, and the experimental data are accurate and timely. This experimental platform uses a camera unit to record microscopic changes in the frosting process. Microscopic processes such as frosting nucleation and growth are recorded in real time.

[0055] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A frosting test bench, characterized in that: The invention comprises an air duct cavity (21), an axial flow fan (1) is provided at the inlet of the air duct cavity (21), a flow equalizing plate (3), a camera unit (4), a heat exchanger (8), a temperature monitoring and regulating unit (24), a humidity monitoring and regulating unit (25) and a wind speed and wind pressure monitoring unit (26) are provided in the air duct cavity (21), the flow equalizing plate (3), the camera unit (4), the temperature monitoring and regulating unit (24), the humidity monitoring and regulating unit (25) and the wind speed and wind pressure monitoring unit (26) are located between the axial flow fan (1) and the heat exchanger (8), and the heat exchanger (8) is respectively connected to a low-temperature coolant circulation tank (9) and a constant temperature water bath tank (10); The heat exchanger (8) is rotatably connected to the air duct cavity (21); a rotation drive unit (27) is provided on the air duct cavity (21); the rotation drive unit (27) is connected to the heat exchanger (8); and the rotation drive unit (27) is used to drive the heat exchanger (8) to rotate.

2. A frosting test bench according to claim 1, characterized in that: A detachable section (22) is detachably provided on the air duct cavity (21), the interior of the detachable section (22) is communicated with the interior of the air duct cavity (21), the connection between the detachable section (22) and the air duct cavity (21) is sealed, the rotation drive unit (27) is fixedly provided on the detachable section (22), and the heat exchanger (8) is located in the detachable section (22).

3. A frosting test bench according to claim 2, characterized in that: A detachable groove (20) is provided on the air duct cavity (21), the detachable section (22) is connected to the air duct cavity (21) via the detachable groove (20), and a sealing component is provided between the detachable groove (20) and the detachable section (22).

4. A frosting test bench according to claim 1, characterized in that: The wind speed and wind pressure monitoring unit (26) includes an anemometer (5), an air duct electric regulating valve (17) and a high-precision pressure sensor (18), wherein the air duct electric regulating valve (17) is located between the axial flow fan (1) and the flow equalizing plate (3), and the anemometer (5) and the high-precision pressure sensor (18) are located between the flow equalizing plate (3) and the heat exchanger (8).

5. A frosting test bench according to claim 1, characterized in that: The humidity monitoring and regulating unit (25) includes a temperature and humidity measuring instrument (7), a humidifying unit and a dehumidifying device, and the humidifying unit and the dehumidifying device are both located between the axial flow fan (1) and the flow equalizing plate (3).

6. A frosting test bench according to claim 1, characterized in that: The temperature monitoring and regulating unit (24) comprises a heating unit (2) and a constant temperature controller (6), wherein the heating unit (2) is located between the axial flow fan (1) and the flow equalizing plate (3), and the constant temperature controller (6) is located between the flow equalizing plate (3) and the heat exchanger (8).

7. A frosting test bench according to claim 1, characterized in that: The rotation drive unit (27) includes a drive motor (19) and a rotating shaft. The heat exchanger (8) is fixedly connected to the rotating shaft. The rotating shaft is rotationally connected to the air duct cavity (21). The output end of the drive motor (19) is connected to the rotating shaft via a transmission unit.

8. A frosting test bench according to claim 1, characterized in that: The outlet of the heat exchanger (8) is connected to the inlet of the low-temperature coolant circulation tank (9) and the inlet of the constant-temperature water bath (10) respectively through a first control valve (14); a circulation pump (11) is provided at the inlet of the heat exchanger (8); the outlet of the low-temperature coolant circulation tank (9) is connected to the inlet of the circulation pump (11) through a second control valve (23); and the outlet of the constant-temperature water bath (10) is connected to the inlet of the circulation pump (11) through a third control valve (28).

9. A frosting test bench according to claim 1, characterized in that: The outlet of the first control valve (14) is connected to the inlet of the low-temperature coolant circulation tank (9) through a refrigerant pipeline (15), and the outlet of the first control valve (14) is connected to the inlet of the constant temperature water bath (10) through a heat flow pipeline (16). A heat flux density sensor, a flow sensor and a pressure sensor are provided on the refrigerant pipeline (15) and the heat flow pipeline (16).

10. A frosting test method, based on the frosting test bench according to any one of claims 1 to 9, characterized in that: The following steps are involved: Starting the axial flow fan (1), monitoring the wind speed and wind pressure in the air duct cavity (21) according to the wind speed and wind pressure monitoring unit (26), and adjusting the air outlet speed and wind pressure of the axial flow fan (1) according to the monitoring data; Using a temperature monitoring and regulating unit (24) to monitor and regulate the temperature in the air duct cavity (21); Using the humidity monitoring and regulating unit (25) to monitor and regulate the humidity in the air duct cavity (21); The angle of the heat exchanger (8) is adjusted by using the rotation drive unit (27) to change the angle between the surface of the heat exchanger (8) and the wind direction; The temperature and flow rate of the medium entering the heat exchanger (8) from the low-temperature coolant circulation tank (9) are changed to conduct a frosting experiment; The temperature and flow rate of the medium entering the heat exchanger (8) from the constant temperature water bath (10) are changed to conduct a frost melting experiment; A comprehensive frosting experiment was conducted by replacing heat exchangers (8) with different surface coatings and changing the speed, wind pressure, temperature and humidity.

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