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Journal of Thermal Science

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2022 , Vol. 31 >Issue 4: 1023 - 1036

DOI: https://doi.org/10.1007/s11630-021-1520-6

Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method

  • ZHANG Hu ,
  • WU Kefan ,
  • TANG Guihua
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  • 1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

网络出版日期: 2023-12-01

基金资助

This work was supported by the National Natural Science Foundation of China (No. 52130604, No. 51825604) and Innovative Talents Support Plan of China Postdoctoral Foundation (No. BX20180244).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method

  • ZHANG Hu ,
  • WU Kefan ,
  • TANG Guihua
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  • 1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Online published: 2023-12-01

Supported by

This work was supported by the National Natural Science Foundation of China (No. 52130604, No. 51825604) and Innovative Talents Support Plan of China Postdoctoral Foundation (No. BX20180244).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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摘要

热带法作为一种典型的瞬态导热系数测量方法，被广泛用于测量不同温度下材料的隔热性能。由于热带法的测量理论基于纯导热介质假设，当测量半透明材料如二氧化硅气凝胶和光伏玻璃时其内部热辐射在高温下为主要传热模式，偏离了测量理论，影响测量结果的可靠性。本文采用数值模拟方法研究揭示了热带法测量半透明材料隔热性能的可靠性。通过数值模拟复现了热带法测量半透明材料导热系数时材料内部的导热-辐射耦合传热过程，获得了不同消光系数的半透明灰体材料不同温度下的等效导热系数。将热带法预测结果分别与一维稳态法、瞬态平面热源法和Rosseland模型得到的半透明材料等效导热系数进行对比，发现消光系数低的材料等效导热系数预测结果偏差较大，高温下热带法测量的导热系数高于稳态法测量结果。为实现半透明材料等效导热系数的准确测量，不同导热系数测量方法需考虑辐射传热效应。

关键词： hot strip method; thermal conductivity; translucent materials; thermal radiation

本文引用格式

ZHANG Hu , WU Kefan , TANG Guihua . Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method[J]. 热科学学报, 2022 , 31(4) : 1023 -1036 . DOI: 10.1007/s11630-021-1520-6

Abstract

The hot strip method, as one typical transient method, is widely used to measure the effective thermal conductivity of thermal insulation materials at various temperatures. Since the test theory is based on solving the energy equation via heat conduction, the test result will be questionable when measuring thermal insulation materials, such as silica aerogel and photovoltaic glazing, in which the participating thermal radiation is a dominant heat transfer mode at high temperature. In this study, numerical investigation is employed to reveal the measurement reliability of hot strip method when applied to translucent thermal insulation materials. By reproducing the dynamic conduction-radiation coupled heat transfer process within the translucent materials numerically, the effective thermal conductivity of translucent materials with varying extinction coefficients are obtained at various temperatures. Comparisons are made for the effective thermal conductivity of translucent materials determined by the hot strip method, one-dimensional steady state method, transient plane source method and Rosseland model. Large discrepancies are found among the effective thermal conductivity determined by different methods for translucent materials with low extinction coefficient. The thermal conductivity obtained from the hot strip method is overestimated at elevated temperature when compared with that from one-dimensional steady state method. In order to measure the effective thermal conductivity of translucent materials accurately, the effect of thermal radiation should be considered for different transient methods.

Key words： hot strip method; thermal conductivity; translucent materials; thermal radiation

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