Effect of coating thickness on roof top thermal performance

Foo, Lin Hui (2015) Effect of coating thickness on roof top thermal performance. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Global warming and heat island issues have getting more serious nowadays. These issues have brought significant consequences to increase the peak demand of electricity used for cooling purpose. Cool roof coatings have recently been introduced to building surfaces to reduce the building temperature. However, there is lack of study on identifying the optimum cool roof coating thickness applied on the substrate. Therefore the objectives in this study are to study the effect of coating thickness on thermal resistance properties such as change in temperature and heat flux and to determine the optimum thickness of coating on galvanized steel substrate. Six galvanized steel substrate coated with different cool roof coating thickness were exposed under sunlight for three days from 9.30 am to 4.30 pm. The data collected was analysed by one way ANOVA and Pearson moment correlation analysis. Results demonstrated that the increase of coating thickness decrease the change in temperature and heat flux, but then become stable when certain limit has been exceeded. This study shows that the optimum cool roof coating thickness is at the range of 0.3099 mm which contributed the lowest amount of change in temperature and heat flux. Any coating thickness more than 0.3099 mm shows no effect in lowering the change in temperature and heat flux.

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