Thermal Conductivity of Selected Aluminum Roofing Sheets in Nigeria
Abstract
Thermal conductivity of six samples was determined. Samples are pure aluminum long span roofing sheets with red, blue, black, green and white colours. Giralle roofing sheet was also examined. The lees’ disc steady state method was used and the results show the thermal conductivity of the samples as follows; 254.609 + 0.0065 Wm-1k-1 for red, 207.253 + 0.0063 Wm-1k-1 for blue, 111.659 + 0.0058 Wm-1k-1 for black, 301.123 + 0.0055 Wm-1k- 1green, 229.925 + 0.0053 Wm-1k-1 for white and 152.738 + 0.0055 Wm-1k-1 for giralle respectively. From these results, green coated sheets had the highest thermal conductivity value of 301.123 + 0.0055 Wm-1k-1 and black has the least thermal conductivity value of 111.659 + 0.0058 Wm-1k-1. It was further observed that the colour of coating affected the thermal conductivity of the samples and was therefore concluded that green is the most suitable sample for roofing and black is the least.
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