Viessmann Vitosol100 - Page 46

3.2Sizing pipe diameters and circulation pump
C
A
D
B
22x122x1
22x1
46
VITOSOL
Installation of collector arrays (connection in series, low flow operation, max. 2×6m
2
absorber area)
A Flow
B Return
C Air vent valve
D Z connection pipe
Collector array volume flow at an
average flow rate of 20 l/(m
2
·h)
Aperture area
m
2
Volume
flow
l/h
Required
pipe
diameter
mm
15 300 18×1
20 400
25 500
22×1
30 600
22

×

1
40 800 28×1.5
50 1000
60 1200
35×1.5
70 1400
35

×

1.5
80 1600
90 1800
42×1.5
100 2000
42

×

1.5
120 2400
54×2
150 3000
54×2
Calculation example
Assumptions:
Flow velocity
0.3 to 0.5m/s
np = 1 to 2.5 mbar/m
2 x 6 m
2
absorber area,
e.g. 4 Vitosol 200, type D30
V  6 m
2
· 20 l/(m
2
· h)
V  120 l/h
V  2 l/min
According to diagram on page50 this
results in a pressure drop of
np  1.2mbar, i.e. for 2 x 6 m
2
approx. 5 mbar, including connection
pipes and connection set.
5822135 GB
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