
276 Principles of Sustainable Energy Systems
© 2008 Taylor & Francis Group, LLC
Angle of incidence i for the solar collector is given by Equation 5.46:
cossin()sin( .)cos( )i =−−°+°°cos(41.7 )cos( 13.7 10°°°) 30 41 730 ii =°23 4.
To calculate the solar radiation using Equations 5.44, 5.45, 5.47, and 5.49, we need to nd
I
b,N
and I.
Extraterrestrial solar radiation
II
n
=+
+
°
0
10034
10034
.
.
cos
360
365.25
= 1353 W/mc
2
oos
2
360 32
365 25
×
.
(Find k from Table 5.3 and assume C
n
is 1)
ICIe
n
k
b,N
/
=
− sin α
=
=
−
1392
0 144 41 7
2
e
./sin( .)°
2
Beam radiation on the collector (Equation 5.45)
bc bN,,
2
= (1121) ...