Modeling of cool roof heat transfer in tropical climate

Kishor T. Zingre, Man Pun Wan, Shanshan Tong, Hua Li, Victor W.-C. Chang, Swee Khian Wong, Winston Boo Thian Toh and Irene Yen Leng Lee

Renewable Energy, 2015, vol. 75, issue C, 210-223

Abstract: Cool roof is gaining popularity as a passive building energy saving solution. A concise and easy-to-apply mathematical model is essential for building designers to evaluate the impact of cool coating on heat transfer and indoor thermal comfort. A novel cool roof heat transfer (CRHT) model was developed using the spectral approximation method. The CRHT model was verified against the conduction transfer function method and was validated against experiments performed in two identically configured apartments with concrete roofs in Singapore. The model predictions show that on a sunny day, a cool coating (solar reflectance of 0.74) reduces the peak roof temperature, indoor air temperature and daily heat gain by up to 14.1 °C, 2.4 °C and 0.66 kWh/m2 (or 54%), respectively through the concrete roof. The model predictions match with experimental measurements with reasonable accuracy. Further model predictions suggested that significant daily heat gain reduction can also be achieved by cool coating on galvanized steel (metal) roofs. The daily heat gain reduction brought by the cool coating drops as the roof exposes to higher wind speeds. The proposed CRHT model largely simplifies the calculation of heat transfer of cool roofs, compared to existing methods, and is generally applicable to opaque solid surfaces (roofs and walls).

Keywords: Cool coating; Solid roof heat gain; Heat transfer model; Tropical climate (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (15)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:75:y:2015:i:c:p:210-223

DOI: 10.1016/j.renene.2014.09.045

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