Thermal repellent properties of surface coating using silica

Global Congress on Construction, Material and Structural Engineering 2017

材料科学;土木建筑工程

Lee, Y.Y.^1 ; Halim, M.S.^1 ; Aminudin, E.^2 ; Guntor, N.A.^1

Jamilus Research Centre (JRC), Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja Batu Pahat, Johor

86400, Malaysia^1

Faculty of Civil Engineering, Universiti Teknologi Malaysia, Johor Bahru

81310, Malaysia^2

关键词: Living environment;    Natural landscapes;    Outdoor environment;    Surface temperatures;    Temperature variation;    Thermal Performance;    Tropical climates;    Urban heat island;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/271/1/012020/pdf
DOI  :  10.1088/1757-899X/271/1/012020

来源: IOP

【 摘 要 】

Extensive land development in urban areas is completely altering the surface profile of human living environment. As cities growing rapidly, impervious building and paved surfaces are replacing the natural landscape. In the developing countries with tropical climate, large masses of building elements, such as brick wall and concrete members, absorb and store large amount of heat, which in turn radiate back to the surrounding air during the night time. This bubble of heat is known as urban heat island (UHI). The use of high albedo urban surfaces is an inexpensive measure that can reduce surrounded temperature. Thus, the main focus of this study is to investigate the ability of silica, SiO2, with high albedo value, to be used as a thermal-repelled surface coating for brick wall. Three different silica coatings were used, namely silicone resin, silicone wax and rain repellent and one exterior commercial paint (jota shield paint) that commercially available in the market were applied on small-scale brick wall models. An uncoated sample also had been fabricated as a control sample for comparison. These models were placed at the outdoor space for solar exposure. Outdoor environment measurement was carried out where the ambient temperature, surface temperature, relative humidity and UV reflectance were recorded. The effect of different type of surface coating on temperature variation of the surface brick wall and the thermal performance of coatings as potential of heat reduction for brick wall have been studied. Based on the results, model with silicone resin achieved the lowest surface temperature which indicated that SiO2can be potentially used to reduce heat absorption on the brick wall and further retains indoor passive thermal comfortability.