Paper Conference

Proceedings of eSim 2016: 9th Conference of IBPSA-Canada


Assessment of green roof energy savings compared to conventional roof

Ghassem Heidarinejad, Arash Esmaili

Abstract: Modeling of mass transfer and heat transfer in Green Roofs as an excellent new way to reduce building cooling load is obtained through solution of governing equations in four components of the roof structure, growth environment, vegetation and air. The governing equations for each component includes non-linear equations and the coupled mass transfer and heat transfer. Based on results contribution of plant metabolisms heat flux is 11.1% which shows that cannot be neglected. Over 40 models among 100 are adopted for the evaluation of thermal, physical and biological parameters in order to achieve best accuracy in numerical results (with average difference of 8% with experimental data). Finally from assessment of cooling potential it can be concluded that the green roof, compared with conventional roof, causing a significant reduction in the surface temperature of the roof (as much as 44 degrees Celsius) and consequently reduce 77 percent of the flux through the roof inside the building.
Pages: 115 - 119