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Principles of Sustainable Energy Systems, Second Edition, 2nd Edition
book

Principles of Sustainable Energy Systems, Second Edition, 2nd Edition

by Frank Kreith, Susan Krumdieck
August 2013
Intermediate to advanced content levelIntermediate to advanced
790 pages
30h 5m
English
CRC Press
Content preview from Principles of Sustainable Energy Systems, Second Edition, 2nd Edition
555Passive Solar Heating, Cooling, and Daylighting
© 2008 Taylor & Francis Group, LLC
9.7.3.1 Solar Altitude Angle (α)
The solar altitude angle is the angle swept out by a person’s arm when pointing to the
horizon directly below the sun and then raising the arm to point at the sun. The equation
to calculate solar altitude, α, is
sin cos cos cos sin sin αδ δ=+LHL
(9.22)
where
L is the local latitude (degrees)
δ is the earth–sun declination (degrees) given by δ = 23.45 sin [360 (n − 81)/365]
n is the day number of the year
H is the hour angle (degrees) given by
H =
()(min)
;
12
4
noon time in
(+morning, afternoon) (9.23)
9.7.3.2 Sun–Window Azimuth ...
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Publisher Resources

ISBN: 9781466556966