Environmental Engineering Reference
In-Depth Information
Figure 2.32
Flow resistances within the double PV facade with a 14 cm air gap
resistances (see Figure 2.32)
˙
Vp
η
Fan
P
el
=
(2.8)
The efficiency of the fan
η
Fan
was assumed to be 80% and the pressure drop is
calculated using
ξ
Channel
H
+
ξ
90
ρ
p
=
ξ
ρ
2
H
d
h
u
2
2
u
2
=
d
h
+
ξ
inlet
+
1
(2.9)
The resistance of a channel for turbulent flow is
0
.
3164
4
=
√
Re
d
ξ
Channel
where
R
e
d
is calculated using a hydraulic diameter which is approximately twice the
width of the air gap:
d
h
≈
2
d
.
Search WWH ::
Custom Search