Energy Efficient Building Design
Energy Efficient Building Design
Energy Efficient Building Design
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31Þ 68Þ<br />
B<br />
Otto Van Geet, NREL FEMP<br />
A<br />
Shading Geometry<br />
A. 68º angle with<br />
horizon fully shades<br />
the window in the<br />
summer<br />
(76.6º = sun’s<br />
24"<br />
15"<br />
altitude @ 40º N<br />
latitude on June 21)<br />
48"<br />
B. 31º angle with<br />
horizon allows full<br />
exposure of the<br />
window in winter<br />
(26.6º = sun’s<br />
altitude @ 40º N<br />
latitude on Dec. 21)
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