Paper Conference

Proceedings of SimBuild Conference 2004: 1st conference of IBPSA-USA


Validation of the Thermal Effect of Roof-Spraying and Green Plants in an Insulated Building

Nan Zhou, Weijun Gao, Chris Marnay, Masaru Nishida, Toshio Ojima
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory
Faculty of Environment Engineering, the University of Kitakyushu
Department of Architecture, Kyushu Sangyo University
Faculty of Environment Engineering, Waseda University.

Abstract: In recent years, roof-spraying and rooftop lawns have proven effective on roofs with poor thermal insulation. However, the roofs of most buildings have insulating material to provide thermal insulation during the winter. The effects of insulation has not previously been quantified. In this study, the authors collected measurements of an insulated building to quantify the thermal effects of roof-spraying and rooftop lawns. Roof-spraying did not significantly reduce cooling loads and required significant amounts of water. The conclusion is that roof spraying is not suitable for buildings with well-insulated roofs. Rooftop lawns, however, significantly stabilized the indoor temperature while additionally helping to mitigate the heat island phenomenon.
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