Dependence of gas permeation and adsorption on temperature in vacuum insulation panels (VIPs) containing getter materials

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Building Physics Pub Date : 2021-05-26 DOI:10.1177/17442591211017154
Hideya Yamamoto, D. Ogura
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引用次数: 6

Abstract

Vacuum insulation panels (VIPs) with a glass-fiber core has been considered to be difficult to operate for a long period of time, such as for building applications, because the thermal conductivity rises rapidly as the pressure increases. However, glass-fiber-core VIPs contain a material called a getter that continuously adsorbs permeated gas, and a theoretical model that considers the properties of the getter has not yet been developed. In this paper, the gas-adsorption mechanism by getters was investigated and a long-term-performance prediction model that considers the temperature dependence was proposed. Some gases were not adsorbed by the getter in the VIPs; however, a model was proposed that takes into account the non-absorbed gases by applying partial pressure to the adsorption isotherm in advance. The long-term performance of VIPs with different areas and volumes was compared with the measured values, and the validity of the calculation results was confirmed. These results show that the long-term performance of VIPs of different sizes can be accurately predicted when the getter performance is well understood.
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含吸气剂真空绝热板中气体渗透和吸附对温度的依赖性
以玻璃纤维为核心的真空隔热板(vip)一直被认为难以长时间运行,例如用于建筑应用,因为热导率随着压力的增加而迅速上升。然而,玻璃纤维芯vip包含一种称为吸气剂的材料,它可以持续吸附渗透气体,并且考虑吸气剂特性的理论模型尚未开发。本文研究了吸附剂的气体吸附机理,提出了考虑温度依赖性的吸附剂长期性能预测模型。在vip中,有些气体没有被吸气器吸附;然而,通过对吸附等温线预先施加分压,提出了一个考虑未吸收气体的模型。将不同面积和体积的vip的长期性能与实测值进行比较,验证了计算结果的有效性。这些结果表明,在了解吸剂性能的前提下,可以准确预测不同尺寸的vip的长期性能。
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
Journal of Building Physics
Journal of Building Physics 工程技术-结构与建筑技术
CiteScore
5.10
自引率
15.00%
发文量
10
审稿时长
5.3 months
期刊介绍: Journal of Building Physics (J. Bldg. Phys) is an international, peer-reviewed journal that publishes a high quality research and state of the art “integrated” papers to promote scientifically thorough advancement of all the areas of non-structural performance of a building and particularly in heat, air, moisture transfer.
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