Performance evaluation of glass wool core VIPs and silica-fly ash core VIPs

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
A. Shahzad, Zhaofeng Chen, Zaffar M. Khan, Desire Emefa Awuye
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Abstract

Temperature maintenance is one of the leading factors for the large-scale energy consumption in buildings, which accounts for 33% of the total consumption. The heavy smog in China resulting from the depletion of fossil fuels necessitates the development of new technologies that can reduce the energy usage in buildings. Several techniques for building’s thermal insulation were developed among which the utilization of Vacuum Insulation Panels (VIPs) has the leading edge. For refrigeration purpose in VIPs, the glass wool is being used as a core material because of their low thermal conductivity (λ ≤ 2 mW/m·K) and low cost. However, the silica-fly ash has been preferred as a core material of VIPs for buildings because of its high compressive strength (σc > 2 MPa) and the most economical price. Moreover, the P1/2 of the glass wool VIP and silica-fly ash VIP are 10–100 and 1000 Pa, respectively. In this work, the performance of VIPs with various cores has been compared. The thermal conductivity of VIPs, along with the factors affecting thermal conductivity, such as density, thickness, internal pressure, and porous structures, have been evaluated. In addition, the effect of core materials on the cost of VIPs was also quantified. It is expected that the study will serve as a pioneering work in the foundation to development of the next-generation, low-cost VIPs used for building insulations.
玻璃棉芯vip和二氧化硅-粉煤灰芯vip性能评价
温度维护是建筑大规模能耗的主导因素之一,占建筑总能耗的33%。由于化石燃料的消耗,中国出现了严重的雾霾,这就要求开发能够减少建筑能耗的新技术。近年来发展了几种建筑保温技术,其中真空绝热板的应用处于领先地位。由于玻璃棉的导热系数低(λ≤2 mW/m·K)且成本低,因此在vip的制冷目的中,玻璃棉被用作核心材料。硅粉粉煤灰抗压强度高(σc > 2 MPa),价格经济,是建筑vip核心材料的首选材料。玻璃棉VIP和二氧化硅-粉煤灰VIP的P1/2分别为10 ~ 100 Pa和1000 Pa。在这项工作中,我们比较了不同核的vip的性能。评估了vip的导热系数,以及影响导热系数的因素,如密度、厚度、内压和多孔结构。此外,还量化了芯材对vip成本的影响。预计该研究将成为开发用于建筑隔热材料的下一代低成本VIPs的开创性工作。
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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