Evaluation of the Solar Absorption and Economics of Steel Roofs for Heat Sources

Janejira  Yoochareon; Chanon  Bunmephiphit

doi:10.69650/rast.2024.255517

Authors

Janejira Yoochareon Smart Energy and Environmental Management, Rattanakosin College for Sustainable Energy and Environment, Rajamangala University of Technology Rattanakosin, Nakhon Pathom 73170, Thailand
Chanon Bunmephiphit Smart Energy and Environmental Management, Rattanakosin College for Sustainable Energy and Environment, Rajamangala University of Technology Rattanakosin, Nakhon Pathom 73170, Thailand

DOI:

https://doi.org/10.69650/rast.2024.255517

Keywords:

Solar absorptance, Heat, Roof steel, Economic

Abstract

Energy conservation in buildings and homes helps reduce energy use and save on energy costs. This study was to examine how the absorption of solar radiation (α) affects the amount of cooling load of colors steel roof. That impacts the energy costs of air conditioning compared to a tiled roof. The study used a spectrophotometer to analyze solar radiation’s heat-absorbing properties in the 300-2,500 nm wavelength range. The roof uses a steel area of 1,000 m² with 10 metal roof coating colors (red, brown, gray, bluish-green, light-green, dark-green, orange, light-blue, dark-blue, and colorless). The result was found that gray, brown, dark-green, dark-blue, light-green, bluish-green, red, light-blue, orange and colorless metal roofs absorbed varying levels of heat from sunlight. Interestingly, colorless metal roofs had the least impact on heat absorption, resulting in the maximum energy saving effect in the air conditioning system, amounting to 125,085.32 baht per year. Furthermore, the break-even value was calculated to be 0.21 years.

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