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IJSTR >> Volume 6 - Issue 11, November 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Alternative Hybrid Core Material For Vacuum Insulation Panels (Silica-Fly Ash-Glass Fiber)

[Full Text]



Desire Emefa Awuye, Zhaofeng Chen, Binbin Li, Wang Xuejia



Core material, Fly ash, Fumed silica, Microstructure, Thermal conductivity, VIP



Vacuum insulation panels, one of the most promising insulation materials consisting of an evacuated core material, an air tight envelope and in special cases an absorbent known as getter. However, despite its outstanding properties, it faces some challenges such as relatively high cost and quite a short service life which can be attributed to the core material used. In this paper, Hybrid core materials (HCM) consisting of various percentages of fly ash, fumed silica and glass fiber were used as a core material for vacuum insulation panels, and the composition ratio vs thermal conductivity were investigated to ascertain the optimum composition ratio that showed the lowest thermal conductivity and best insulation properties. This was to produce VIPs at a relatively cheaper cost. The optimum ratio of the HCM that showed the best insulation properties including lower thermal conductivity is that of 65% fly ash (FA), 30% fumed silica (FS) and 5% glass fiber (GF). The HCM produced exhibited similar qualities as that of silica powder core VIPs. Even though produced at a relatively lower cost, the insulation properties were not compromised. Furthermore, the thermal conductivity of each of the VIPs from the HCMs prepared were measured after undergoing a temperature stress of 60 °C for 6 months.



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