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

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.

Authors:
 [1];  [2];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. CEPT Univ., Ahmedabad (India)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
OSTI Identifier:
1398508
Report Number(s):
LBNL-20011057
ark:/13030/qt2769w7wr
DOE Contract Number:
AC02-05CH11231
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION

Citation Formats

Kohler, Christian, Shukla, Yash, and Rawal, Rajan. Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows. United States: N. p., 2017. Web. doi:10.2172/1398508.
Kohler, Christian, Shukla, Yash, & Rawal, Rajan. Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows. United States. doi:10.2172/1398508.
Kohler, Christian, Shukla, Yash, and Rawal, Rajan. Wed . "Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows". United States. doi:10.2172/1398508. https://www.osti.gov/servlets/purl/1398508.
@article{osti_1398508,
title = {Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows},
author = {Kohler, Christian and Shukla, Yash and Rawal, Rajan},
abstractNote = {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.},
doi = {10.2172/1398508},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 09 00:00:00 EDT 2017},
month = {Wed Aug 09 00:00:00 EDT 2017}
}

Technical Report:

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