Journal
SUSTAINABILITY
Volume 13, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/su13094665
Keywords
air-conditioner; cooling load; heat conduction; residential building; roof tile colour; roof-top surface; solar reflectance; temperature; thermal comfort; tropical climate
Funding
- KDC Consultants, Bangladesh [0153AB-M11]
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The study shows that using white roof tiles can significantly reduce heat conduction transmission and roof surface temperature, with a peak temperature reduction of up to 16.00 degrees Celsius and energy savings of up to 13.14%. Further research on solar-reflective paint for non-white roof tiles is essential to address maintenance issues and lack of preference among buyers.
Modern residential roofs in Malaysia mainly employ red and brown roof tiles due to aesthetic factors and the ability of the roof surface to reflect or retard heat transfer is typically not considered the main priority. The present article reveals the findings of a study on the effect of roof tile colour on heat conduction transfer through roof tiles and ceiling boards, roof-top surface temperature and cooling load. Findings suggest that the selection of white roof tiles significantly reduces the peaks of heat conduction transfer and roof-top surface temperature as well as the values of heat conduction transfer and roof-top surface temperature throughout diurnal profiles, which consequently reduces hours of indoor thermal discomfort and use of air-conditioners in indoor spaces. A decline in peak roof-top surface temperature of up to 16.00 degrees C that results in annual energy savings of up to 13.14% can be achieved when the roof tile colour is changed from red to white. Further research on the development of solar-reflective paint or coating products that can significantly increase the solar reflectance values of non-white roof tiles are essential to overcome issues related to maintenance difficulties and lack of preference among house buyers towards white roof tiles.
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