Paper Conference

Proceedings of Building Simulation 2011: 12th Conference of IBPSA


Issues and solutions to more realistically simulate conventional and cool roofs

Thomas Graham Carter

Abstract: Simulation software accounts for the physical properties of cool roofs, in particular, a high short wave solar reflectance (or albedo) and a high long wave emissivity. However, in some instances the observed benefits of cool roofs in practice indicate a level of savings far in excess of what common simulation programs predict. An empirical study to better understand and explain the performance of cool roofs was carried out with the hypothesis that an urban heat island effect occurring at roof and building level was the primary factor leading to the difference between prediction and observation. Simulation results were then adjusted using additional theory to closely approximate the observed results. Suggestions are made of how common simulation packages can be enhanced to better predict the benefits of cool roofs.
Pages: 2911 - 2918