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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
291Fundamentals of Solar Radiation
© 2008 Taylor & Francis Group, LLC
of the diffuse solar radiation within the view angle. Figure 5.22 shows the geometry of a
pyrheliometer sky occulting tube.
In this gure, the opening half angle
θ
o
R
L
=
tan
1
(5.81)
The slope angle
θ
p
Rr
L
=
tan
()
1
(5.82)
The limit half angle
θ
=
+
tan
()
1
Rr
L
(5.83)
FIGURE 5.21
A pyranometer with a shade ring to measure sky diffuse radiation.
TABLE 5.10
Shading Band Correction Factors due to Anisotropy
Solar Altitude Angle
k
T
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
<20° 0.0 0.0 0.0 0.0 0.015 0.06 0.14 0.23 0.24 0.24
20°–40° 0.0 0.0 0.0 0.0 0.006 0.05 0.125 0.205 0.225 0.225
40°–60° ...
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Publisher Resources

ISBN: 9781466556966