Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Analysis of Worldwide Performance of Façade Systems

Matthias Werner1, Rainer Pfluger1, David Geisler-Moroder2, Wolfgang Feist1
1University of Innsbruck, Innsbruck, Austria
2Bartenbach GmbH, Aldrans, Austria

Abstract: The façade mainly defines the heating, cooling and electric light demand. Depending on the insulation quality and the transparent parts with its specific system for glare, sun protection and/or daylight redirection the transmission losses and gains are defined. This paper analyses façade solutions and shading strategies in terms of minimal total final energy demand for worldwidedistributed locations with the help of a coupled lighting and thermal simulation. The study focuses on a very efficient building standard (passive house, heating and cooling supply by heat pumps, dimmable LED artificial light system), equator oriented facades and an office usage. A conventional shading system (external venetian blind) and a complex façade system (daylight redirection system) are evaluated. The optimized shading period for every location is presented and it can be shown that the optimal shading duration is highly depended on the latitude. The electric light demand has a significant influence on the total final energy demand and has therefore an impact on the façade design. Thus, the optimization with an integral approach of heating, cooling and artificial light determines much larger transparent areas than a thermal optimization. Savings of up to 30% of the total primary energy demand can be achieved. In addition, with the use of a daylight redirection system savings of up to 20% are possible.
Pages: 1011 - 1020