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Information regarding design and operation
Pressure drop of Vitosol 200-T and Vitosol 300-T
Relative to water, corresponds to Tyfocor LS at approx. 60 °C
200
20
100
10
50
5
40
4
30
3
25
2.5
20
2
15
1.5
10
1
18
5
0.5
4
0.4
3
0.3
2
0.2
60
70 100
Flow rate in l/h
Pressure drop of Vitosol 200-T, type SP2A and Vitosol 300-T, type
SP3B
A 1.26/1.51 m
2
B 3.03 m
2
18.8 Flow velocity and pressure drop
Flow velocity
To minimise the pressure drop through the solar thermal system pipe-
work, the flow velocity in the copper pipe should not exceed 1 m/s. In
accordance with VDI 6002-1, we recommend flow velocities of
between 0.4 and 0.7 m/s. At these flow velocities, a pressure drop of
between 1 and 2,5 mbar/m/0.1 and 0.25 kPa/m pipe length will
result.
Note
A higher flow velocity results in a higher pressure drop. A substantially
lower velocity will make venting harder.
VIESMANN
148
A
200
300 400 500
800
150
(cont.)
10
1
8
0.8
B
6
0.6
5
0.5
4
0.4
3
0.3
2
0.2
1
0.1
0.8
0.08
0.6
0.06
0.5
0.05
0.4
0.04
0.3
0.03
0.2
0.02
0.1
0.01
Flow rate in l/min
Pressure drop of Vitosol 200-T, type SPE
The air that collects at the collector must be routed downwards through
the solar flow line to the air vent valve. For the installation of collectors,
we recommend sizing the pipes as for a normal heating system accord-
ing to flow rate and velocity (see the following table).
Subject to the flow rate and pipe dimension, different flow velocities
result.
VITOSOL
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