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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
372 Principles of Sustainable Energy Systems
© 2008 Taylor & Francis Group, LLC
where L = 40° δ
s
= −21.1 on January 15, and β = 60°. The hour angle h
s
equals 15° for each
hour away from noon.
The n efciency is obtained from Equation 7.32:
η
f
ml D
ml D
=
tanh ()
()
/
/
2
2
where
m
U
kt
c
=
=
××
=
12
4
12
8
390 510
64
//
.
and
η
f
=
=
tanh .(..)
.(..)
.
64015001 2
64015001 2
0 938
/
/
The collector efciency factor F is, from Equation 7.37,
=
++
=
+
F
U
lUDw hD
c
cfci
1
121
180
0151 80001
/
//
/
/
[( ())( )]
.
.[ .(.
,
ηπ
00140938 1 1500 001
092
..).]
.
×+ ×
=
/
π
Then we obtain the heat-removal factor from Equation 7.43:
F
Gc
U
UF
Gc
R
p
c
c
p
=−
1exp
Time (h) I
h
(Wm
2
) R
b
I
d,c
(W/m
2
) I
b,c
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Publisher Resources

ISBN: 9781466556966