400
Flow rate in l/h
2000 600 800
Pressure drop in kPa
0
5
10
15
20
25
0
50
100
150
200
250
Pressure drop in mbar
Pressure drop Vitosol 200-TM, 3.26 m
2
13.7 Flow velocity and pressure drop
Flow velocity
To minimise the pressure drop through the solar thermal system
pipework, the flow velocity in the copper pipe should not exceed
1 m/s. In accordance with VDI 6002-1 [or local regulations], we rec-
ommend 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 substan-
tially lower flow velocity will make ventilation more difficult.
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 standard heating
system according to flow rate and flow velocity (see the following
table).
Subject to the flow rate and pipe dimensions, different flow velocities
result.
Information regarding design and operation
(cont.)
VITOSOL
VIESMANN
129
5822 440 GB
13
To Next Page
Loading...
