Viessmann Vitosol
100 Technical Manual page 46

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