Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- CEPT Univ., Ahmedabad (India)
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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1398508
- Report Number(s):
- LBNL--20011057; ark:/13030/qt2769w7wr
- Country of Publication:
- United States
- Language:
- English
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