Cooling performance testing device for traditional radiation cooling material and wire outer surface cooling coating material

Abstract

The utility model relates to the field of cooling performance testing of daily and industrial radiation cooling materials and wire outer surface cooling coating materials, in particular to a cooling performance testing device for traditional radiation cooling materials and wire outer surface cooling coating materials. The cooling performance testing device for the traditional radiation cooling material comprises a heat capture module adhered to the surface of the traditional radiation cooling material to be tested, the heat capture module is connected with a DAQ system, the DAQ system is connected with a movable power supply device, and the DAQ system is further electrically connected with a computer. A thermal compensation module is also connected between the to-be-tested traditional radiation cooling material and the DAQ system, and the thermal compensation module is controlled by the DAQ system; according to the test device, the cooling performance of different radiation cooling materials and different wire surface cooling coatings can be accurately tested, the test requirements under different environment conditions of multiple regions can be met, the test device is high in accuracy and good in real-time performance, and a theoretical basis can be provided for research of the radiation cooling materials.

Description

Technical Field

[0001] The utility model relates to the field of cooling performance testing of daily and industrial radiation cooling materials and wire outer surface cooling coating materials, and in particular to a cooling performance testing device for traditional radiation cooling materials and wire outer surface cooling coating materials. Background Art

[0002] With the advancement of science, my country's industrialization level has developed rapidly. In the hot summer, outdoor heating appliances and high-voltage transmission lines are in a high-temperature and high-load state for a long time due to the simultaneous effect of outdoor sunlight radiation and their own Joule heat during use, which affects circuit safety and power transmission. At the same time, long-term service of heating appliances under light and heat radiation conditions will cause rapid aging and degradation of the coating materials on the surface of outdoor heating appliances, thereby shortening the service life and causing energy waste. Nowadays, the preparation of a radiation cooling material for the surface of outdoor heating appliances and high-voltage transmission lines has become one of the current research and production hotspots, but there is currently no mature testing method and means to conduct actual cooling performance tests on the prepared cooling materials and guide material design through test results. Summary of the Invention

[0003] The utility model overcomes the shortcomings of the existing technology and provides a cooling performance test device for traditional radiation cooling materials and cooling coating materials on the outer surface of wires. The cooling performance test devices are respectively suitable for traditional radiation cooling materials and cooling coating materials on the outer surface of high-voltage transmission wires. They are mainly used for standard testing of the cooling effect of coating materials and to guide the design and development of cooling coatings.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A cooling performance testing device for traditional radiation cooling materials includes a heat capture module adhered to the surface of the traditional radiation cooling material to be tested, the heat capture module is connected to a DAQ system, the DAQ system is connected to a movable power supply device, and the DAQ system is also electrically connected to a computer. A thermal compensation module is also commonly connected between the traditional radiation cooling material to be tested and the DAQ system, and the thermal compensation module is controlled by the DAQ system.

[0006] As a further limitation of the technical solution of the present utility model, the traditional radiation cooling material to be tested can be any structural material such as a coating material, a thin film material, a two-dimensional super surface structure material or a curved surface structure material.

[0007] As a further limitation of the technical solution of the present utility model, the heat capture module is selected from one of commercial thermocouples of different shapes and materials.

[0008] As a further limitation of the technical solution of the present invention, the thermal compensation module is composed of a PI heating film. The PI heating film that constitutes the thermal compensation module is adhered to the bottom of the traditional radiation cooling material to be tested and the heat capture module, and heats the traditional radiation cooling material to be tested through heat conduction to achieve thermal compensation of power.

[0009] The utility model also provides a cooling performance testing device for a temperature-reducing coating material on the outer surface of a wire, comprising a heat capture module adhered to the surface of the wire to be tested, one end of the heat capture module being connected to one end of the wire to be tested, and the other end being connected to a DAQ system, the DAQ system being connected to a movable power supply device, the DAQ system being also electrically connected to a computer, both ends of the wire to be tested being further connected to a current / voltage control module, the current / voltage control module being further connected to the movable power supply device, and during the test process, the coating material is scraped or sprayed onto the surface of the test wire for testing.

[0010] As a further limitation of the technical solution of the present utility model, the heat capture module is selected from one of commercial thermocouples of different shapes and materials.

[0011] As a further limitation of the technical solution of the present invention, the wires to be tested are designed as series circuits or parallel circuits according to different usage conditions, so that multiple groups of parallel tests can be achieved.

[0012] As a further limitation of the technical solution of the present utility model, the connection between the two ports of the test wire used to connect to the current / voltage control module is subjected to flat hot pressing treatment to form a flat-shaped structural interface, and a vise-shaped wire is used to connect the two flat-shaped interfaces of the wire to the current / voltage control module to form a conductive loop, wherein the outer side of the connection between the two flat-shaped interfaces of the wire and the current / voltage control module is wrapped with high-temperature resistant insulating silicone rubber as an outer protective material.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model can effectively solve the test and evaluation of traditional radiation cooling materials, and at the same time solve the test problem of the cooling performance of the coating material on the outer surface of the wire. Through more accurate simulation design, the test goal of the cooling performance of the coating material on the outer surface of the high-voltage transmission line can be achieved. The construction of this device can not only realize the test of traditional radiation cooling materials, but also realize the cooling test of the coating material on the outer surface of the wire under different conditions of use. This device can also realize the test of the cooling performance of the coating material on the outer surface of different high-voltage transmission wires in different geographical environments. The effective combination of this test device and the CNC DAQ system (data identification, acquisition, calculation, control and recording system) has high test accuracy and good real-time performance, and can realize the test and research of the cooling performance of the coating material on the outer surface of high-voltage wires.

[0015] The utility model tests the cooling performance change law of traditional radiation cooling materials and high-voltage transmission line outer surface coating materials. The change characteristics are significantly different from the test results of portable infrared temperature imaging instruments. The design of this device is not affected by wind speed and can accurately measure the true surface temperature of the coating material. At the same time, this device can also directly test the cooling power P of the cooling material. cool Therefore, the utility model can provide a more accurate and comprehensive research basis for the research on the cooling performance test of new radiation cooling materials and cooling coating materials on the outer surface of high-voltage transmission line and the design of radiation cooling materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the cooling performance test device for traditional radiation cooling materials.

[0017] Figure 2 This is a schematic diagram of the structure of the cooling performance testing device for the cooling coating material on the outer surface of the heating wire.

[0018] Figure 3 This is a test result of the outdoor cooling performance of traditional radiant cooling materials.

[0019] Figure 4 This is the test result of the cooling performance of the radiant cooling material used in outdoor simulated heating wires.

[0020] The following are marked in the figure:

[0021] 1-Mobile power supply device, 2-Traditional radiation cooling material to be tested, 3-Heat capture module, 4-Thermal compensation module, 5-DAQ system, 6-Computer, 7-Current / voltage control module, 8-Test wires. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to specific embodiments. Example

[0023] 1. Cooling performance test device of traditional radiation cooling materials

[0024] like Figure 1As shown, the cooling performance test device for traditional radiative cooling materials includes a heat capture module 3 attached to the surface of the traditional radiative cooling material 2 to be tested. The heat capture module 3 is connected to a DAQ system 5, which is connected to a mobile power supply device 1. The DAQ system 5 is also electrically connected to a computer 6. A thermal compensation module 4 is also connected between the traditional radiative cooling material 2 to be tested and the DAQ system 5. The thermal compensation module 4 is controlled by the DAQ system. The DAQ system can autonomously collect the cooling temperature ∆T of the sample and autonomously calculate and record the actual cooling power P through the DAQ system. cool .

[0025] Furthermore, the traditional radiation cooling material 2 to be tested is a coating material, a thin film material, a two-dimensional super surface structure material or a curved surface structure material.

[0026] The heat capture module 3 is a high-precision heat capture module, which can be selected and customized according to the size of the sample material to be prepared. The heat capture module used can be based on the material properties of the selected sample radiation cooling material (that is, the traditional radiation cooling material 2 to be tested). Commercial thermocouples with suitable high adhesion and different appearance structures can be selected as heat capture modules to meet the test requirements of high precision and high stability.

[0027] DAQ system 5 has multi-channel temperature data acquisition and recognition functions, which can simultaneously meet the cooling performance ∆T and cooling power P of multiple groups of sample materials. cool Parallel test; DAQ system can collect and identify multi-channel temperature information, and compare and calculate the temperature information, and realize the control of thermal compensation module 4 through the calculation results, and finally realize the dynamic equality of multi-channel sample temperature. In this process, the heat supplied to the sample material is recorded in real time by DAQ and calculated as the cooling power P cool .

[0028] The DAQ system 5 calculates the collected and identified multi-channel temperature data and controls the thermal compensation module 4 based on the calculation results, supplying heat to the sample material to achieve dynamic temperature equality. The DAQ's autonomous identification, calculation, and control of thermal compensation functions are based on the principles of difference calculation, electrothermal power calculation, and thermal compensation.

[0029] The output of the DAQ system 5 is connected to a thermal compensation module 4, which is composed of a PI heating film. This PI heating film adheres to the underside of the traditional radiant cooling material 2 to be tested and the heat capture module 3, and heats the traditional radiant cooling material 2 to be tested through heat conduction. The dimensions of the DAQ system are 30*30*20 to 100*100*50.

[0030] The portable power supply device 1 is composed of a lithium battery that can be charged and discharged cyclically. Lithium batteries of different capacities can be selected as the portable power supply device according to the amount of power consumption.

[0031] The steps for testing the cooling performance test device of the above-mentioned traditional radiant cooling material are as follows:

[0032] 1) First, determine the basic properties of the traditional radiative cooling material 2 to be tested; the traditional radiative cooling material used in this embodiment is a laboratory-made polymer hybrid inorganic nano-cooling coating material;

[0033] 2) Select a heat capture module that is suitable for the material, shape, and size of the traditional radiative cooling material 2 to be tested. In this embodiment, the heat capture module 3 used is a common thermocouple. The heat capture module 3 is attached to the bottom of the traditional radiative cooling material 2 to be tested. The heat capture module 3 is connected to the DAQ system 5 via a serial converter DT-5019 (converting signals to RS485).

[0034] 3) Select a thermal compensation module 4 that is suitable for the material, shape, and size of the traditional radiative cooling material 2 to be tested. In this embodiment, the thermal compensation module 4 uses a common commercial PI film, which is then adhered to the bottom of the traditional radiative cooling material 2 and the heat capture module 3 using commercial 3M adhesive. The thermal compensation module 4 is connected to the DAQ system via a serial converter DT-5019 (converting signals to RS485).

[0035] 4) Connect the DAQ system 5 to the computer 6 via the USB port, and connect the DAQ system 5 and the computer 6 to the mobile power supply respectively.

[0036] 5) Select an environment with direct sunlight and place the traditional radiant cooling material 2 to be tested there. Turn on the power cord, the computer, the DAQ system, and the PDRC application software on the computer. Simultaneously, click the test button in the PDRC system. Turn on all switches and buttons to begin testing and recording. (The PDRC application software is currently known software.)

[0037] 6) Test results such as Figure 3 As shown, Figure 3 a is the temperature of the metal substrate surface coated with the hybrid polymer cooling coating I, b is the temperature of the metal substrate surface coated with the hybrid polymer cooling coating II, and the unnamed blue line is the temperature of the metal substrate surface without any cooling coating. Figure 3 The metal substrates involved are the same. (Note: a and b here are the same as Figure 4 a and b in the table correspond to the same coating and are used on different coating substrates. Figure 3The coated substrate is a metal sheet, Figure 4 The one in the middle is the heating resistor. Figure 3 It can be seen that compared with the uncoated metal base material, the surface temperature of the protected metal base material has been reduced to a certain extent. In the experiment, a metal base without any cooling coating and two metal bases coated with cooling coating were set up. The temperature of the two base metals was tested using the above test device and method, and the difference between the two was obtained, thereby obtaining the cooling effect of the cooling coating on the metal base, which directly reflects the accuracy and real-time performance of the above device. Figure 3 It can be concluded that the cooling material a has the best cooling effect, that is, the cooling effect is ∆T=15℃, which is consistent with the average cooling power P cool =165W / m 2 .

[0038] 2. Cooling performance test device for the cooling coating material on the outer surface of heating wires

[0039] like Figure 2 As shown, the cooling performance testing device for the cooling coating material on the outer surface of a heating wire includes a heat capture module 3 attached to the surface of the wire to be tested 8. One end of the heat capture module 3 is connected to one end of the wire to be tested 8, and the other end is connected to a DAQ system 5. The DAQ system 5 is connected to a movable power supply device 1. The DAQ system 5 is also electrically connected to a computer 6. Both ends of the wire to be tested 8 are also connected to a current / voltage control module 7, and the current / voltage control module 7 is also connected to the movable power supply device 1. The wire to be tested 8 is replaced with a daily or industrial wire of different material types according to the test environment requirements. During the test, the coating material is scraped or sprayed on the surface of the wire to be tested 8 for testing. The current / voltage control module 7 is specifically a switch voltage stabilizing container, model: UTP1306S.

[0040] Furthermore, the heat capture module 3 is selected from one of commercial thermocouples of different shapes and materials, and the DAQ system 5 and the movable power supply device 1 are the same as the DAQ system 5 and the movable power supply device 1 in the cooling performance test device of the above-mentioned traditional radiation cooling material.

[0041] Furthermore, the wire to be tested 8 is designed as a series circuit or a parallel circuit according to different usage conditions, so as to realize multiple groups of parallel tests and achieve real-time temperature capture of multi-channel parallel experiments.

[0042] The selected wire to be tested 8 is subjected to a simple outer surface treatment to facilitate better bonding with the heat capture module 3. The connection between the two ports of the wire to be tested 8 used to connect to the current / voltage control module 7 is subjected to flat hot pressing treatment to form a flat structural interface. The flat hot pressing treatment is to perform flat hot pressing on the two interfaces of the selected wire sample into a flat shape by means of flat hot pressing. The hot pressing process parameters here are set to different pressures of 0.1MPa-500MPa according to different wire materials, and the pressing time is 1-6 hours.

[0043] Then, a vise-shaped wire is used to connect the two flat-shaped interfaces of the wire to the current / voltage control module to form a conductive loop. The outer side of the connection between the two flat-shaped interfaces of the wire and the current / voltage control module is wrapped with high-temperature resistant insulating silicone rubber as an external protective material, which prevents high-voltage heat generation while reducing the occurrence of safety accidents.

[0044] The connected current / voltage control module 7 can selectively set different output powers, thereby simulating the heating conditions of different wires under different actual usage conditions by controlling the output power; the current / voltage control module is connected to a portable mobile power supply device that supports both direct current and alternating current, which can be portable, breaking the traditional geographical limitations, and can adjust the maximum output voltage, with large power storage capacity and high safety.

[0045] The steps for testing the cooling performance of the wire outer surface cooling coating material using the above-mentioned cooling performance testing device are as follows:

[0046] 1) First, different wire materials are selected according to different test conditions. In this embodiment, household wires are selected as the target wires. A polymer composite material is prepared in the form of a sprayable liquid material. The cooling effect of the prepared polymer material is evaluated using a test device.

[0047] 2) Connect the wires in series or in parallel according to the test requirements, and heat-press the ends of the sealed wires to form a flat state. In this embodiment, three identical sections of household wires were connected in series, with one section being a blank section as a control and the remaining two sections being used as a performance test group to form a thermal resistor.

[0048] 3) The test environment is selected on a summer day in Beijing, and then a small file is used to slightly grind the test parts of the thermal resistors connected in series to make them frosted.

[0049] 4) Adhere the designed heat capture module 3 (0.5cm×2cm) to the polished area;

[0050] 5) Use vise wires to connect the current / voltage control device 7 to the thermal resistor, and at the same time wrap the bonding area with the selected adhesive to ensure that the wires are not exposed at the connection part;

[0051] 6) Connect the current / voltage control module 7 to the portable mobile power supply device 1;

[0052] 7) Connect the heat capture module 3 connected in 4) to the DAQ system via a five-way circuit; connect the heat capture module 3 to the data acquisition system of the DAQ system, and simultaneously connect the data acquisition system to the signal control conversion system. Connect the data acquisition system and the signal control conversion system to the computer 6;

[0053] 8) Apply the outer surface coating material to the wire to be tested, and enclose the thermocouple at the connection between the heat capture module 3 and the wire within the coating material. Spray the prepared cooling material onto the cylindrical surface of the household wire at a pressure of 1.5 MPa for 2 minutes, ensuring the thickness and uniformity of the sprayed material. After spraying, allow the material to dry naturally for 24 hours before placing it in an ambient environment to simulate real-world operating conditions.

[0054] 9) Turn on the DC or AC current power supply according to the test requirements and set the specific target voltage or current through the current / voltage control module.

[0055] 10) Turn on the power switch of the mobile power pile, turn on the computer, turn on the DAQ system, open the computer PDRC application software, and click the test button in the PDRC system at the same time. Turn on all switches and buttons to start testing and recording.

[0056] After completing 1)-10), preheat the entire device for 0.5-2 hours. Then, depending on the test time, wait for the end of the test. After the test, compare the real-time data T and data P. cool (The PDRC application software is a known software.) This embodiment is set to an alternating current condition. The portable power supply 1 is turned on, and the output voltage and current are set to 20V and 1.5A, respectively. A preheating process is performed for 1 hour. After the preheating process is complete, the signal acquisition system and the signal control conversion system are turned on, and the computer is turned on to track and store the test and calculation data.

[0057] like Figure 4 As shown, Figure 4 a and b represent the surface temperature of thermocouples coated with different cooling coatings (the cooling coatings of a and b are Figure 3 The red column is the average temperature of the thermal resistor surface without any cooling paint; Figure 4The bar graph in the figure is the average value of the linear graph on the left. After applying the cooling paint to the heating resistor, the test results are as follows: Figure 4 As shown in the figure, the temperature of the thermal resistor coated with the cooling paint is lower than that of the thermal resistor without the cooling paint. At the same time, it can be seen that the cooling effects of different cooling paints are different. Among them, the cooling paint of b has the best cooling effect, that is, the average ∆T=3.7℃, which is consistent with the average P cool =20W / m 2 This directly demonstrates the accuracy and real-time performance of the cooling coating tested by the present invention for simulating the cooling performance of high-voltage heat conductors. The blue circle in the bar chart illustrates the practicality of the present invention's testing. The temperature of the blue line corresponds to a coating cooling effect of 52°C, which is the optimal cooling effect. The test results of the present invention's apparatus can be used to select the optimal type of cooling coating to be prepared, i.e., its practicality.

Claims

1. The cooling performance test device of traditional radiation cooling material is characterized by: The invention comprises a heat capture module (3) attached to the surface of a conventional radiation cooling material (2) to be tested, wherein the heat capture module (3) is connected to a DAQ system (5), the DAQ system (5) is connected to a movable power supply device (1), the DAQ system (5) is also electrically connected to a computer (6), and a heat compensation module (4) is also commonly connected between the conventional radiation cooling material (2) to be tested and the DAQ system (5), and the heat compensation module (4) is controlled by the DAQ system (5).

2. The cooling performance testing device of the traditional radiant cooling material according to claim 1 is characterized in that: The conventional radiation cooling material (2) to be tested is a coating material, a thin film material, a two-dimensional super surface structure material or a curved surface structure material.

3. The cooling performance testing device of the traditional radiant cooling material according to claim 1, characterized in that: The heat capture module (3) is selected from one of commercial thermocouples of different shapes and materials.

4. The cooling performance testing device of the traditional radiant cooling material according to claim 1, characterized in that: The thermal compensation module (4) is composed of a PI heating film. The PI heating film constituting the thermal compensation module (4) is adhered to the lower portion of the conventional radiation cooling material (2) to be tested and the heat capture module (3), and heats the conventional radiation cooling material (2) to be tested by heat conduction.

5. A cooling performance testing device for a wire outer surface cooling coating material, characterized in that: The invention comprises a heat capture module (3) attached to the surface of a test wire (8), one end of the heat capture module (3) is connected to one end of the test wire (8), and the other end is connected to a DAQ system (5), the DAQ system (5) is connected to a movable power supply device (1), and the DAQ system (5) is also electrically connected to a computer (6). Both ends of the test wire (8) are also connected to a current / voltage control module (7), and the current / voltage control module (7) is also connected to the movable power supply device (1). During the test process, a coating material is scraped or sprayed on the surface of the test wire (8) for testing.

6. The cooling performance testing device for the temperature-reducing coating material on the outer surface of an electric wire according to claim 5, characterized in that: The heat capture module (3) is selected from one of commercial thermocouples of different shapes and materials.

7. The cooling performance testing device for the temperature-reducing coating material on the outer surface of an electric wire according to claim 5, characterized in that: The wires to be tested (8) are designed as series circuits or parallel circuits according to different usage conditions, so as to realize multiple groups of parallel tests.

8. The cooling performance testing device for the temperature-reducing coating material on the outer surface of an electric wire according to claim 5, characterized in that: The connection of the two ports of the test wire (8) used for connecting to the current / voltage control module (7) is subjected to flat hot pressing treatment to form a flat-shaped structural interface, and a vise-shaped wire is used to connect the two flat-shaped interfaces of the wire to the current / voltage control module to form a conductive loop, wherein the outer side of the connection between the two flat-shaped interfaces of the wire and the current / voltage control module is wrapped with high-temperature resistant insulating silicone rubber as an outer protective material.

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