Calorimetric determination of emissivity for metallic foils: An innovative approach for thermal analysis

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-15 DOI:10.1016/j.ijrefrig.2025.06.018

Abdul Rehman Hashmi , Yunfei Gao , Jiahao Yu , Haoren Wang , Bo Wang , Fatima Saadat , Zhihua Gan

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Abstract

In vacuum environments, thermal radiation significantly influences heat transfer, making accurate emissivity predictions crucial for improving the efficiency of refrigeration systems. However, emissivity is a highly sensitive parameter that is challenging to measure with precision due to the limited availability of reliable measurement methods. This paper introduces an innovative method for measuring the total hemispherical emissivity of metallic foils, specifically targeting highly reflective metals. In this study, the emissivity of the 99.9 % pure aluminum with a thickness of 25.4 μm was measured across a temperature range of 170.1 K to 283.8 K, varying from 0.0185 to 0.0205, with a comparative analysis revealing a 38.3 % difference between the shiny and matte sides of the foil. Additionally, the influence of absorber temperature was examined using an insulation layer. The experimental results were validated against published data within the same temperature range and further corroborated through simulations. This approach offers a reliable and precise method for measuring emissivity in highly reflective metals under low-temperature conditions.

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金属箔发射率的量热测定：热分析的创新方法

在真空环境中，热辐射显著影响传热，因此准确的辐射率预测对于提高制冷系统的效率至关重要。然而，发射率是一个高度敏感的参数，由于可靠的测量方法有限，难以精确测量。本文介绍了一种测量金属箔半球总发射率的创新方法，特别是针对高反射金属。在本研究中，测量了厚度为25.4 μm、纯度为99.9%的铝在170.1 K至283.8 K、0.0185至0.0205的温度范围内的发射率，对比分析显示，箔的光泽面和哑光面之间的发射率差异为38.3%。此外，利用保温层考察了吸收器温度的影响。实验结果与已发表的相同温度范围内的数据进行了验证，并通过模拟得到了进一步的证实。该方法为在低温条件下测量高反射金属的发射率提供了可靠而精确的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.