Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows

Christian Kohler1, Yash Shukla2, Rajan Rawal2
1Lawrence Berkeley National Laboratory, Berkeley, USA
2CEPT University, Ahmedabad, India

Abstract: Current prescriptive building codes have limited ways to account for the effect of solar shading, such as overhangs and awnings, on window solar heat gains. We propose two new indicators, the adjusted Solar Heat Gain Coefficient (aSHGC) which accounts for external shading while calculating the SHGC of a window, and a weighted SHGC (SHGCw) which provides a seasonal SHGC weighted by solar intensity. We demonstrate a method to calculate these indices using existing tools combined with additional calculations. The method is demonstrated by calculating the effect of an awning on a clear double glazing in New Delhi.
Pages: 2634 - 2640