Abstract
Reflective coatings have been promoted for improved energy performance of buildings and are considered in some building regulations such as the California Title 24 standard. This paper provides an analysis of the energy impact of different internal and external surface coatings on heating and cooling energy performance across a variety of climates, constructions and building types. The analysis is undertaken with the ESP-r integrated whole building simulation program. The results are compared with other studies and conclusions are drawn. The effect of these properties is shown to affect the energy performance of buildings and to vary with the context.
Highlights
Roofs are often the surfaces in buildings on which the highest amount of solar radiation per m2 falls over the year
The measurements for making the comparisons in this study were taken at different periods but it was found that high reflectance roofs typically yielded measured summertime daily air-conditioning savings and peak demand reductions of about 10–30%
A simplified analytical study of extremely high reflective roof coatings in warm climates could be found in the literature [9], in which the roof constructions were assessed independently of the building and in which the heat storage of the roof was ignored. In this analytical study it was found that the high reflective external coatings could drastically reduce the heat flux that reaches the internal part of the roof and reduce the external surface temperature of the roof
Summary
Roofs are often the surfaces in buildings on which the highest amount of solar radiation per m2 falls over the year. The properties of internal and external roof coatings could impact the way solar radiation is affecting heating and cooling loads in buildings This has been recognised in some building Standards such as the California Title 24 standard [1] in which there are prescriptive requirements for the reflectance and emittance of roof materials. A simplified analytical study of extremely high reflective roof coatings (i.e. reflectance of 0.9) in warm climates could be found in the literature [9], in which the roof constructions were assessed independently of the building and in which the heat storage of the roof was ignored. Limited research has been done on the potential energy savings from the properties of internal roof coatings and most of the previous studies for the energy performance of internal and external roof coatings were done in hot and sunny climates, while their effect of such coatings on heating season has not been discussed thoroughly in the literature
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