Surface temperature sensor calibration device and calibration method thereof

Abstract

The invention provides a heat pipe surface temperature sensor calibration device, which comprises an ethanol heat pipe or N-methyl pyrrolidone heat pipe surface temperature source, a metal temperature equalizing block, a high-precision temperature control system, a two-section heating device, a power measuring instrument and a data acquisition device, the central axis of a surface temperature source of the ethanol heat pipe or the N-methyl pyrrolidone heat pipe is provided with three level meter traps. The invention correspondingly provides a new method for accurately determining the surface calibration temperature of the heat pipe surface source based on the Fourier law, the accuracy of surface temperature calibration is improved, modeling and complex calculation of the heat conductivity coefficient of the heat pipe surface source are avoided, the workload is small, operation is simple and reliable, and the method is suitable for popularization and application. The problem that an existing surface temperature sensor is not high in calibration precision is solved.

Description

Technical Field

[0001] The present invention relates to a surface temperature sensor calibration device and a calibration method for precisely calibrating various surface temperature sensors, and the applicable temperature is from room temperature to 300 °C. Background Art

[0002] A surface temperature sensor calibrator is a metrological device for calibrating and verifying the surface temperature accuracy of a surface temperature sensor. Existing surface temperature sensor calibrators usually use pure metal as a temperature equalizing block to generate a relatively uniform and stable surface temperature. When the temperature of the surface temperature sensor on the surface source of the metal temperature equalizing block is in thermal equilibrium, the temperature inside the temperature equalizing block is measured approximately as the surface temperature of the metal temperature equalizing block, or the linear extrapolation method is used to determine the surface temperature of the metal temperature equalizing block, and it is used to calibrate the surface temperature sensor. Currently, commercially available surface temperature calibrators that hold a monopoly in the world all use this principle and method to achieve the calibration of the surface temperature.

[0003] The traditional surface temperature sensor calibrator using a metal temperature equalizing block as a surface source mainly has the following problems: First, due to the limitations of its physical properties, there is a negative correlation between the thermal conductivity and heat capacity of the surface source of the metal temperature equalizing block, that is, the metal with strong stability has a too slow heating speed, and the metal with a fast heating speed has a poor temperature field stability. Therefore, the technical indicators of the temperature stability and uniformity of the metal temperature equalizing block are not very satisfactory, which affects the calibration accuracy of the surface temperature sensor. Second, when determining the surface temperature of the surface source, the axial heat flow is not accurately measured, and the surface temperature of the surface source cannot be accurately calculated. And using the extrapolation method to approximately calculate the surface temperature or directly measuring the temperature of the metal block as the surface temperature has the following disadvantages: The influence of the surrounding environment heat exchange and material physical property parameters on the measurement result is not considered. Therefore, this measurement method will introduce greater uncertainty and affect the accuracy of the surface temperature calibration.

[0004] A heat pipe is an efficient heat transfer element that uses the phase change of a working medium for heat transfer, and is known as a superconductor or super heat conductor of heat. Its working principle is to remove the gas dissolved in the high-purity working medium, and then fill the closed heat pipe cavity with the working medium under high vacuum using the gravity of the working medium. The heat is transferred from the high-temperature section to the low-temperature section by using the phase change heat transfer of the working medium at a small temperature difference. At the same time, under the action of gravity and capillary attraction, the condensed working medium returns to the high-temperature section again. Therefore, the heat pipe uses the circulation of the working medium to achieve efficient heat transfer and can provide a relatively uniform temperature field for temperature calibration. However, the heat transfer coefficient λ of the heat pipe is jointly determined by various factors such as its shape design, working medium, internal structure, shell material, and working temperature, and its calculation model is very complex. If it is simply used as a temperature equalizing device, it is difficult to establish a heat transfer model to calculate the surface temperature from the internal temperature, and it is not easy to calibrate the surface temperature sensor. Summary of the Invention

[0005] In order to overcome the problems existing in the surface temperature calibration of the surface source of the pure metal isothermal block in the background art and improve the calibration ability of the surface temperature, the present invention designs a surface temperature sensor calibration device applicable to room temperature to 300 °C. The calibration device includes a heating device, a heat pipe surface temperature source, a metal isothermal block, a temperature sensor, a data collector, a power meter, a high-precision temperature control system, a computer, a first temperature sensor, a second temperature sensor, and a third temperature sensor. The heat insulation layer and the metal isothermal block are coaxially arranged in the heating device along the central axis of the heating device. The heat insulation layer is arranged outside the metal isothermal block. The middle part of the metal isothermal block has an accommodation space for placing the heat pipe surface temperature source. The heat pipe surface temperature source is placed in the accommodation space in the middle of the metal isothermal block.

[0006] The high-precision temperature control system is used to control the heating current supplied to the heating device, and the power meter is used to detect the heating power consumed by the heating device and transmit it to the computer in real time. The center position of the upper surface of the heat pipe surface source is provided with a surface temperature sensor to be calibrated. The surface temperature sensor is connected to the surface temperature sensor data collector, and the surface temperature sensor data collector is used to collect the temperature measurement value to be calibrated of the surface temperature sensor.

[0007] The side wall of the heat pipe surface source is successively provided with a first measuring well, a second measuring well, and a third measuring well from top to bottom along the vertical direction. Three insertion holes are also provided at corresponding positions on the side wall of the heating device. The first temperature sensor, the second temperature sensor, and the third temperature sensor respectively pass through the insertion holes and are inserted into the three horizontal measuring wells of the heat pipe surface source to respectively obtain the first temperature T1, the second temperature T2, and the third temperature T3 inside the heat pipe surface source and send them to the computer. The first temperature T1, the second temperature T2, and the third temperature T3 are located on the same vertical axis.

[0008] The computer establishes a first heat conduction model according to the first temperature T1, the second temperature T2, and the third temperature T3, calculates the temperature of the inner wall of the upper surface of the heat pipe surface source housing, and then establishes a second heat conduction model according to the temperature of the inner wall of the upper surface of the housing and the heating power measured by the power meter to calculate the temperature of the outer wall of the upper surface of the heat pipe surface source housing. Finally, the temperature of the outer wall of the upper surface of the heat pipe surface source housing is used to calibrate the temperature measurement value to be calibrated of the surface temperature sensor.

[0009] The heating device is a two-stage high-precision heating furnace. The heat insulation layer and the metal isothermal block are coaxially arranged in the furnace chamber of the two-stage high-precision heating furnace. The two-stage high-precision heating furnace has a bottom heating element and a side wall heating element, and the heating powers of the bottom heating element and the side wall heating element are independently controlled by the high-precision temperature control system respectively.

[0010] The heat pipe surface source uses anhydrous ethanol or N-methylpyrrolidone as the heat pipe working medium. The housing of the heat pipe surface source is made of stainless steel, and a wire mesh is welded at the top of the internal cavity of the heat pipe as the wick. The three horizontal gauging wells on the side wall of the housing of the heat pipe surface source are located in the upper half of the heat pipe surface source. The thickness of the upper surface of the housing of the heat pipe surface source is H1. The vertical distance between the horizontal axis of the first gauging well and the inner wall of the upper surface of the housing of the heat pipe surface source is H2. The vertical distance between the horizontal axis of the first gauging well and the horizontal axis of the second gauging well is H3. The vertical distance between the horizontal axis of the second gauging well and the horizontal axis of the third gauging well is H4, where H1 < H2 < H3 = H4.

[0011] The present application also proposes a calibration method for a heat pipe surface temperature sensor calibration device. Based on the above heat pipe surface temperature sensor calibration device, the calibration method includes:

[0012] Step 1: Establish a one-dimensional heat conduction equation set (2), (3), and (4) including the estimated temperature value T interface,n on the inner wall of the upper surface of the housing of the heat pipe surface source, the first temperature T1, the second temperature T2, and the third temperature T3, that is, the first heat conduction model, specifically as follows:

[0013]

[0014] where n is the number for calculating the estimated temperature value of the inner wall of the upper surface of the housing of the heat pipe surface source by a linear method in different one-dimensional heat conduction equations, and the thermal conductivity of the heat pipe surface source is λ;

[0015] Step 2: Calculate the first estimated value T interface,1 of the temperature of the inner wall of the upper surface of the housing of the heat pipe surface source, the second estimated value T interface,2 , and the third estimated value T interface,3 respectively according to the above equation set;

[0016] Step 3: Calculate the average value of the three estimated values as the temperature value T interface of the inner wall of the upper surface of the housing of the heat pipe surface source through the following formula (5);

[0017]

[0018] Step 4: Establish a one-dimensional heat conduction equation set (6) including the temperature value T interface of the inner wall of the upper surface of the housing of the heat pipe surface source and the temperature value T surface of the outer wall of the upper surface of the housing of the heat pipe surface source, that is, the second heat conduction model, specifically as follows:

[0019]

[0020] In formula (6), q is the power converted into heat measured by the power meter; λsteel is the thermal conductivity of the housing material of the heat pipe surface source 9;

[0021] Step Five: Calculate the outer wall temperature value T of the upper surface of the housing of the heat pipe surface source through the above formula (6) surface As the calibrated temperature value, compare it with the temperature measurement value to be calibrated of the surface temperature sensor collected by the surface temperature sensor data collector to complete the calibration of the surface temperature sensor.

[0022] This application designs and develops a calibration device for surface temperature sensors based on heat pipes with anhydrous ethanol or N-methylpyrrolidone, providing a uniform and stable surface calibration temperature. Compared with traditional metal solid surface sources, the uniformity and stability of its surface temperature are significantly improved. The calibration device of this application includes three horizontal wells with the temperature measurement points located on the central axis of the heat pipe surface source, and a new method based on Fourier's law is proposed to accurately determine the surface calibration temperature of the heat pipe surface source. It not only improves the accuracy of surface temperature calibration, but also avoids the modeling and complex calculation of the thermal conductivity of the heat pipe surface source, with small workload, simple and reliable operation, and solves the problem of low calibration accuracy of current surface temperature sensors. Brief Description of the Drawings

[0023] Figure 1 is the overall schematic diagram of the calibration device for heat pipe surface temperature sensors;

[0024] Figure 2 is the schematic diagram of the heating device;

[0025] Figure 3 is the cross-sectional schematic diagram of the heat pipe surface source;

[0026] Figure 4 is the schematic diagram of the method for determining the surface temperature of the heat pipe surface source;

[0027] Reference Numerals: Surface Temperature Sensor Data Collector 1, Self-weight Surface Temperature Sensor 2, Heating Device 3, Data Collector 4, Power Meter 5, High-precision Temperature Control System 6, Computer 7, First Temperature Sensor 8A, Second Temperature Sensor 8B, Third Temperature Sensor 8C, Heat Pipe Surface Temperature Source 9, Metal Isothermal Block 10, Two-stage Heating Element 11, Insulation Layer 12. Detailed Embodiments

[0028] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0029] Figure 1It is an overall schematic diagram of the calibration device for the heat pipe surface temperature sensor of the present invention. The calibration device includes a heating device 3, a heat pipe surface temperature source 9, a metal isothermal block 10, a temperature sensor 8, a data collector 4, a power meter 5, a high-precision temperature control system 6, a computer 7, a first temperature sensor 8A, a second temperature sensor 8B, and a third temperature sensor 8C.

[0030] Figure 2 It is a schematic diagram of the heating device. Specifically, the heating device 3 is a two-stage high-precision heating furnace. Inside the furnace of the two-stage high-precision heating furnace, there is an adiabatic layer 12 and a metal isothermal block 10 arranged coaxially. The adiabatic layer 12 is arranged outside the metal isothermal block 10. The middle part of the metal isothermal block 10 has a substantially cylindrical accommodating space for placing the heat pipe surface temperature source 9. The electric power consumed by the heating device 3 is supplied by the high-precision temperature control system 6. The high-precision temperature control system 6 uses a Eurotherm 3504 temperature controller to accurately control the furnace temperature through PID. The power it consumes is monitored by the power meter 5 and transmitted to the computer 7 in real time. The power meter 5 uses a PW-3335 power measuring instrument. The bottom and side walls of the heating device 3 are provided with heating elements 11. The heating current of the heating elements 11 is independently controlled by the high-precision temperature control system 6 respectively, and three heating modes, namely side wall heating, bottom heating, and side wall / bottom heating, can be realized. The adiabatic layer 12 in the furnace uses a non-flammable adiabatic material to ensure that a large amount of heat cannot be dissipated from the bottom and side walls under the calibration conditions, and only the top is in contact with the air in the working state.

[0031] The heat pipe surface temperature source 9 is placed in the accommodating space in the middle of the metal isothermal block 10, placed along the central axis of the two-stage high-precision heating furnace in the middle of the furnace body. The metal isothermal block 10 is coaxial with the heat pipe surface temperature source 9 and is located outside the heat pipe surface temperature source 9.

[0032] Figure 3Schematic diagram of the heat pipe surface source 9, which is the core component of the present invention. In order to achieve a surface temperature ranging from room temperature to 300 °C, the heat pipe surface source 9 uses anhydrous ethanol or N-methylpyrrolidone as the heat pipe working fluid. Among them, the heat pipe with anhydrous ethanol as the working fluid has a working temperature range from room temperature to 130 °C, and the heat pipe with N-methylpyrrolidone as the working fluid has a working temperature range from 100 °C to 300 °C. This application uses the heating vacuum degassing method to remove the residual gas dissolved in anhydrous ethanol or N-methylpyrrolidone to the greatest extent, improve the purity of the heat pipe working fluid, and reduce the influence of non-condensable gas on the heat pipe performance. The housing of the heat pipe surface source 9 is made of 316L stainless steel, and a wire mesh is welded at the top of the internal cavity as a wick to increase the surface capillary force, so that the liquid film can spread evenly during the working state of the heat pipe, making the surface temperature more uniform. Before filling the working fluid of ethanol or N-methylpyrrolidone, the heat pipe shell needs to be heated and vacuum degassed for a long time, and then high-purity liquid ethanol or N-methylpyrrolidone is injected into the heat pipe interior under the action of gravity through the filling pipe. Finally, the filling pipe is sealed using the hydraulic cold sealing technology to complete the production of the heat pipe surface source 9.

[0033] A self-weight surface temperature sensor 2 to be calibrated is provided at the center position of the upper surface of the heat pipe surface source 9. The self-weight surface temperature sensor 2 is connected to the surface temperature sensor data collector 1, and the surface temperature sensor data collector 1 is used to collect the temperature measurement value to be calibrated of the self-weight surface temperature sensor 2.

[0034] Three level gauges are successively opened along the vertical direction from top to bottom on the side wall of the heat pipe surface source 9, namely the first level gauge, the second level gauge, and the third level gauge. The first temperature sensor 8A, the second temperature sensor 8B, and the third temperature sensor 8C are respectively inserted into the first level gauge, the second level gauge, and the third level gauge. The inner diameter of the level gauge is 5 mm and the depth is 80 mm. Preferably, the first temperature sensor 8A, the second temperature sensor 8B, and the third temperature sensor 8C are three PT100 platinum resistance thermometers. Corresponding positions on the side wall of the heating device 3 are also provided with three insertion holes, and the first temperature sensor 8A, the second temperature sensor 8B, and the third temperature sensor 8C respectively pass through the insertion holes and are inserted into the three level gauges of the heat pipe surface source 9. The temperature measurement ends of the first temperature sensor 8A, the second temperature sensor 8B, and the third temperature sensor 8C are all located on the central axis of the heat pipe surface source 9. The first temperature sensor 8A obtains the first temperature T1 inside the heat pipe surface source 9, the second temperature sensor 8B obtains the second temperature T2 inside the heat pipe surface source 9, and the third temperature sensor 8C obtains the third temperature T3 inside the heat pipe surface source 9. Therefore, the first temperature T1, the second temperature T2, and the third temperature T3 are located on the same vertical axis.

[0035] Preferably, the three horizontal gauge wells on the side wall of the housing of the heat pipe surface source 9 are located in the upper half of the heat pipe surface source 9. The thickness of the upper surface of the housing of the heat pipe surface source 9 is H1, that is, the vertical distance from the inner wall to the outer wall of the upper surface of the housing of the heat pipe surface source 9 is H1. The vertical distance between the horizontal axis of the first gauge well and the inner wall of the upper surface of the housing of the heat pipe surface source 9 is H2. The vertical distance between the horizontal axis of the first gauge well and the horizontal axis of the second gauge well is H3. The vertical distance between the horizontal axis of the second gauge well and the horizontal axis of the third gauge well is H4. Among them, H1 < H2 < H3 = H4. The purpose of such a setting is to ensure the uniformity of the first temperature T1, the second temperature T2, and the third temperature T3, and at the same time make the first gauge well as close as possible to the inner wall of the upper surface of the housing of the heat pipe surface source 9. In a preferred embodiment, H1 = 5 mm, H2 = 9 mm, H3 = H4 = 10 mm.

[0036] The first temperature sensor 8A, the second temperature sensor 8B, and the third temperature sensor 8C are connected to the data collector 4. The data collector 4 collects the first temperature T1, the second temperature T2, and the third temperature T3 measured by the first temperature sensor 8A, the second temperature sensor 8B, and the third temperature sensor 8C and sends them to the computer 7. The computer 7 runs the corresponding program to monitor the first temperature T1, the second temperature T2, and the third temperature T3 in real time.

[0037] Figure 4 It is a schematic diagram of the extrapolation method for the upper surface of the heat pipe surface source. According to the one-dimensional heat conduction equation (1):

[0038]

[0039] It can be seen from the above one-dimensional heat conduction equation that the heat flux density is equal in the axial direction of the heat pipe surface source 9. Therefore, for the ethanol surface source 9, its axial temperature distribution is linearly related to the axial position. The temperature of the inner wall of the upper surface of the housing of the heat pipe surface source is calculated by a linear method; then the temperature of the outer wall of the surface is calculated according to the power measured by the power meter according to the one-dimensional heat conduction equation. Specifically as follows:

[0040] Step 1: Establish a one-dimensional heat conduction equation set (2), (3), and (4) including the estimated temperature value T interface,n of the inner wall of the upper surface of the housing of the heat pipe surface source 9, the first temperature T1, the second temperature T2, and the third temperature T3, that is, the first heat conduction model, specifically as follows:

[0041]

[0042] Where n is the number of the estimated value of the inner wall temperature of the upper surface of the heat pipe surface source shell calculated by the linear method in different one-dimensional heat conduction equations, and the thermal conductivity of the heat pipe surface source 9 is λ. Since both sides of the equation are multiplied by the thermal conductivity λ in the above equation, they can be offset in the calculation process, thereby avoiding modeling and complex calculation of the thermal conductivity of the heat pipe surface source 9.

[0043] Step 2: According to the above equations, calculate the first estimated value T of the inner wall temperature of the upper surface of the heat pipe surface source shell interface,1 , the second estimated value T interface,2 and the third estimated value T interface,3 .

[0044] Step 3: Calculate the average of the three estimated values ​​using the following formula (5) as the inner wall temperature value T of the upper surface of the heat pipe surface source shell interface .

[0045]

[0046] Step 4: Establish the temperature value T of the inner wall of the upper surface of the shell including the heat pipe surface source 9 interface , heat pipe surface source 9 shell upper surface outer wall temperature value T surface The one-dimensional heat conduction equations (6), namely the second heat conduction model, are as follows:

[0047]

[0048] In formula (6), q is the power converted into heat measured by the power meter 5; λsteel is the thermal conductivity of the shell material of the heat pipe surface source 9, which is the thermal conductivity of 316L stainless steel in this embodiment.

[0049] Step 5: Calculate the outer wall temperature T of the upper surface of the heat pipe surface source 9 shell by the above formula (6): surface As the calibration temperature value, it is compared with the temperature measurement value to be calibrated collected by the surface temperature sensor data collector 1 of the self-weight type surface temperature sensor 2, so as to complete the calibration of the self-weight type surface temperature sensor 2.

[0050] Those skilled in the art can understand that the above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A calibration device for the surface temperature sensor of a heat pipe, characterized in that The calibration device includes a heating device, a heat pipe surface temperature source, a metal isothermal block, temperature sensors, a data collector, a power meter, a high-precision temperature control system, a computer, a first temperature sensor, a second temperature sensor, and a third temperature sensor; the heat insulation layer and the metal isothermal block are coaxially arranged in the heating device along the central axis of the heating device; the heat insulation layer is arranged outside the metal isothermal block; the middle part of the metal isothermal block has an accommodation space for placing the heat pipe surface temperature source; the heat pipe surface temperature source is placed in the accommodation space in the middle of the metal isothermal block; The high-precision temperature control system is used to control the heating current supplied to the heating device, and the power meter is used to detect the heating power consumed by the heating device and transmit it to the computer in real time; A surface temperature sensor to be calibrated is arranged at the center position of the upper surface of the heat pipe surface source, the surface temperature sensor is connected to the surface temperature sensor data collector, and the surface temperature sensor data collector is used to collect the temperature measurement value to be calibrated of the surface temperature sensor; First, second, and third measuring wells are successively opened from top to bottom along the vertical direction on the side wall of the heat pipe surface source, and three insertion holes are also opened at corresponding positions on the side wall of the heating device. The first temperature sensor, the second temperature sensor, and the third temperature sensor respectively pass through the insertion holes and are inserted into the three horizontal measuring wells of the heat pipe surface source to respectively obtain the first temperature T1, the second temperature T2, and the third temperature T3 inside the heat pipe surface source and send them to the computer. The first temperature T1, the second temperature T2, and the third temperature T3 are located on the same vertical axis; The computer establishes a heat conduction model based on the first temperature T1, the second temperature T2, the third temperature T3, and the heating power measured by the power meter, calculates the outer wall temperature of the upper surface of the shell of the heat pipe surface source, and calibrates the temperature measurement value to be calibrated of the surface temperature sensor with the outer wall temperature of the upper surface of the shell of the heat pipe surface source.

2. The heat pipe surface temperature sensor calibration device according to claim 1, wherein The computer establishes a first heat conduction model based on the first temperature T1, the second temperature T2, and the third temperature T3, calculates the inner wall temperature of the upper surface of the shell of the heat pipe surface source, then establishes a second heat conduction model based on the inner wall temperature of the upper surface of the shell and the heating power measured by the power meter to calculate the outer wall temperature of the upper surface of the shell of the heat pipe surface source, and finally calibrates the temperature measurement value to be calibrated of the surface temperature sensor with the outer wall temperature of the upper surface of the shell of the heat pipe surface source.

3. The heat pipe surface temperature sensor calibration device according to claim 1, characterized in that The heating device is a two-stage high-precision heating furnace, and the heat insulation layer and the metal isothermal block are coaxially arranged in the furnace cavity of the two-stage high-precision heating furnace.

4. The heat pipe surface temperature sensor calibration device according to claim 3, characterized in that, The two-stage high-precision heating furnace has a bottom heating element and a side wall heating element, and the heating powers of the bottom heating element and the side wall heating element are independently controlled by the high-precision temperature control system respectively.

5. The calibration device for the heat pipe surface temperature sensor according to any one of claims 1-4, characterized in that, The heat pipe surface source uses anhydrous ethanol or N-methylpyrrolidone as the heat pipe working medium, the shell of the heat pipe surface source is made of stainless steel, and a wire mesh is welded at the top of the inner cavity of the heat pipe as a wick.

6. The calibration device for the heat pipe surface temperature sensor according to any one of claims 1-4, characterized in that, The three horizontal measuring wells on the side wall of the shell of the heat pipe surface source are located in the upper half of the heat pipe surface source.

7. The heat pipe surface temperature sensor calibration device according to any one of claims 1-4, characterized in that The thickness of the upper surface of the heat pipe surface source housing is H1. The vertical distance between the horizontal axis of the first counting well and the inner wall of the upper surface of the heat pipe surface source housing is H2. The vertical distance between the horizontal axis of the first counting well and the horizontal axis of the second counting well is H3. The vertical distance between the horizontal axis of the second counting well and the horizontal axis of the third counting well is H4, where H1 < H2 < H3 = H4.

8. A calibration method for a calibration device of a heat pipe surface temperature sensor, based on the calibration device of the heat pipe surface temperature sensor according to any one of the above claims 1-7, characterized in that, The calibration method includes: Step 1: Establish a one-dimensional heat conduction equations (2), (3) and (4) including the estimated temperature value T on the inner wall of the upper surface of the heat pipe surface source housing, i.e., the first heat conduction model, as follows: interface，n , the first temperature T1, the second temperature T2, and the third temperature T3, specifically as follows: where n is the number of the estimated value of the temperature of the inner wall of the upper surface of the heat pipe surface source calculated by the linear method in different one-dimensional heat conduction equations, and the thermal conductivity of the heat pipe surface source is λ; Step 2: Calculate the first estimated value T of the inner wall temperature of the upper surface of the heat pipe surface source housing, the second estimated value T interface，1 , the second estimated value T interface，2 , and the third estimated value T interface，3 ; Step 3: Calculate the average value of the three estimated values through the following formula (5) as the inner wall temperature value T of the upper surface of the heat pipe surface source housing interface ; Step 4: Establish a one-dimensional heat conduction equation set (6), i.e., the second heat conduction model, including the inner wall temperature value T of the upper surface of the heat pipe surface source housing interface and the outer wall temperature value T of the upper surface of the heat pipe surface source housing surface as follows: In formula (6), q is the power converted into heat measured by the power meter; λsteel is the thermal conductivity of the housing material of the heat pipe surface source 9; Step Five: Calculate the outer wall temperature value T of the upper surface of the heat pipe surface source housing through the above formula (6). surface As the calibrated temperature value, it is compared with the temperature measurement value to be calibrated of the surface temperature sensor collected by the surface temperature sensor data collector, and the calibration of the surface temperature sensor is completed.

Images