Experimental and theoretical study on the optimal placement of reflective shield in multilayer insulation systems

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-04-07 DOI:10.1016/j.ijrefrig.2025.04.004

Abdul Rehman Hashmi , Haoren Wang , Ruyi Ji , Bo Wang , Anas A. Rahman , Fatima Saadat , Yunfei Gao , Zhihua Gan

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引用次数: 0

Abstract

Multilayer insulation (MLI) systems are widely used in cryogenic applications to minimize heat leak. Despite advancements in research work regarding the optimization of different MLI configurations, there is still a lack of appropriate structural design. The reflective shield will improve the performance of MLI by reducing thermal radiation. This study aims to improve the thermal performance of MLI systems by incorporating reflective shields with MLI materials. More specific, it is focused on determining the optimal placement of reflective shields within the MLI structure to achieve a minimum heat leak. A modified layer-by-layer model has been established to predict the thermal performance obtained from using single and double reflective shield placements. Such predictions were validated through experiments using a liquid nitrogen boil-off calorimeter. The obtained results demonstrate that placing a single reflective shield at the warm boundary improves thermal performance by 18 % compared to using MLI solely, emphasizing the relevance of reflective shield-MLI combinations in cryogenic applications. This work is conducive to offering potential applications for cryogenic clean fuel storage and transportation.

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多层绝缘系统中反射屏蔽优化布置的实验与理论研究

多层绝缘（MLI）系统广泛应用于低温应用，以减少热泄漏。尽管对不同MLI结构的优化研究工作取得了进展，但仍然缺乏适当的结构设计。反射屏蔽通过减少热辐射来改善MLI的性能。本研究旨在通过将反射屏蔽与MLI材料结合来改善MLI系统的热性能。更具体地说，它的重点是确定MLI结构中反射屏蔽的最佳位置，以实现最小的热泄漏。建立了一种改进的逐层模型来预测单反射和双反射屏蔽布置的热性能。这些预测通过使用液氮蒸发量热计的实验得到了验证。研究结果表明，与单独使用MLI相比，在热边界放置单个反射屏蔽板可以提高18%的热性能，强调了反射屏蔽板-MLI组合在低温应用中的相关性。这项工作为低温清洁燃料的储存和运输提供了潜在的应用前景。

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.