Environmental Engineering Reference
In-Depth Information
The normal values for the semi-angle of acceptance (
θ
a
) for photochemical applications
is 90 degrees, whereby
R
C
=
1 (non-concentrating solar system). If the CPC is designed
90
◦
(Figure 12.2.2), all incident solar direct and
diffuse radiation can be collected. The light reflected by the CPC is distributed all
around the tubular receiver so that almost the entire circumference of the receiver
tube is illuminated. CPCs have the advantages of both the PTC and non-concentrating
collector technologies and none of the disadvantages, so they seem to be the best option
for solar photocatalysis. They can make highly efficient use of both direct and diffuse
solar radiation, without the need for solar tracking.
An important factor in photoreactor design is its diameter. As mentioned above,
the Fenton reagent consists of an aqueous solution of hydrogen peroxide and ferrous
90
◦
to
for an acceptance angle of
+
−
Figure 12.2.2
Schematic drawing and photo of CPC with a semi-angle of acceptance of 90
◦
.
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