Flow rate
(total collector area)
Pressure drop per m pipe length (including valves) in mbar/m / kPa/m
Pipe dimensions
l/h
DN10
DN13
DN16
DN20
DN25
Dimensions
12 x 1
15 x 1
18 x 1
22 x 1
28 x 1.5
850
7.2/0.72
2.5/0.25
875
7.6/0.76
2.6/0.26
900
8.0/0.80
2.8/0.28
925
8.4/0.84
2.9/0.29
950
8.8/0.88
3.0/0.30
975
9.2/0.92
3.2/0.32
1000
9.6/0.96
3.4/0.34
Range between 0.4 and 0.7 m/s flow velocity
13.8 Sizing the circulation pump
If the flow rate and pressure drop of the entire solar thermal system
are known, the pump can be selected on the basis of the pump
curve.
Viessmann supplies the Solar-Divicon and a separate solar pump
assembly to simplify the installation and the selection of pumps and
safety equipment. For construction and specification see chapter
"Installation accessories".
Note
The Solar-Divicon and the solar pump assembly are unsuitable for
direct contact with swimming pool water.
Absorber area in m
2
Specific flow rate in l/(hm
2
)
25
30
35
40
50
60
80
Low flow
operation
High flow operation
Flow rate in l/min
2
0.83
1.00
1.17
1.33
1.67
2.00
2.67
3
1.25
1.50
1.75
2.00
2.50
3.00
4.00
4
1.67
2.00
2.33
2.67
3.33
4.00
5.33
5
2.08
2.50
2.92
3.33
4.17
5.00
6.67
6
2.50
3.00
3.50
4.00
5.00
6.00
8.00
7
2.92
3.50
4.08
4.67
5.83
7.00
9.33
8
3.33
4.00
4.67
5.33
6.67
8.00
10.67
9
3.75
4.50
5.25
6.00
7.50
9.00
12.00
10
4.17
5.00
5.83
6.67
8.33
10.00
13.33
12
5.00
6.60
7.00
8.00
10.00
12.00
16.00
14
5.83
7.00
8.17
9.33
11.67
14.00
18.67
16
6.67
8.00
9.33
10.67
13.33
16.00
21.33
18
7.50
9.00
10.50
12.00
15.00
18.00
24.00
20
8.33
10.00
11.67
13.33
16.67
20.00
26.67
25
10.42
12.50
14.58
16.67
20.83
25.00
33.33
30
12.50
15.00
17.50
20.00
25.00
30.00
—
35
14.58
17.50
20.42
23.33
29.17
35.00
—
40
16.67
20.00
23.33
26.67
33.33
—
—
50
20.83
25.00
29.17
33.33
—
—
—
60
25.00
30.00
35.00
—
—
—
—
70
29.17
35.00
—
—
—
—
—
80
33.33
—
—
—
—
—
—
Use of type PS10 or P10, with a residual head of 150 mbar/15 kPa (
≙
1.5 m)
Use of type PS20 or P20, with a residual head of 260 mbar/26 kPa (
≙
2.6 m)
Information regarding solar thermal systems with Vitosolic
Pumps with a power consumption of more than 190 W, in conjunc-
tion with a Vitosolic solar control unit, must be connected via an
additional relay (on site).
Information regarding design and operation
(cont.)
VITOSOL
VIESMANN
131
5822 440 GB
13
