Shading Coefficient (SC) SHADING COEFFICIENT (SC) is the ratio of the solar heat gain through a fenestration product to the solar heat gain through an unshaded 1/8-inch-thick clear double strength glass under the same set of conditions. It can't be a problem for north-facing windows, which receive almost no direct sunlight any time of year. The link to the original Q&A article in PDF form immediately below is preceded by an expanded/updated online version of this article. 0000029142 00000 n Is this correct? (6) South-facing windows have less undesirable solar gain during summer than west- or east-facing windows. 0000023337 00000 n 0000032660 00000 n 2018 INTERNATIONAL ENERGY CONSERVATION CODE (IECC) - Digital Codes 0000058978 00000 n 0000042979 00000 n Subscribe to receive updates from Energy Saver, including new blogs, updated content, and seasonal energy saving tips for consumers and homeowners. It is important to note that the standard SHGC is calculated only for an angle of incidence normal to the window. 0000051079 00000 n /Rotate 0 In addition to glass properties, shading devices integrated into the window assembly are also included in the SC calculation. Passive solar heat gain through large south-facing windows provided most of the winter space heating energy. See ASHRAE Fundamentals, Chapter 27,for lists of solar heat gain factors. I plan to say more about designing passive solar homes effectively in a future blog. East- or west-facing windows produce the most heat gain from May through August. This feature has been temporarily disabled during the beta site preview. Table 3 shows the net solar gain and value of solar gains in northern U.S. cities. Try to design smaller and fewer west-facing windows. Key issues to be learned: a. transmitted portion of the solar heat gain coefficient is given by:[4], T This is a very basic question I confess not knowing the answer to. The question-and-answer article below paraphrases, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss. Cooling load temperature difference calculation method ) 0000038387 00000 n /TT6 17 0 R A product with a low SHGC rating is more effective at reducing cooling loads during the summer by blocking heat gain from the sun. 0000031934 00000 n %3Qd Vw9k\1W7CL9tqM=~u5b&XfmFk!$"4c?9%fb|$N}0R16f]oqnDxo[hot;3Nq_fO-jldHA '*bIgdyfs[B[Z+^:E 9)Uii;/J PH( 6.u. w For windows, skylights, and glass doors, a U-factor may refer to just the glass or glazing alone. Passive Solar Buildings.
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