Solar System Design Guide
77
6020 457 - 01
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.
Note:
The Solar-Divicon and the solar pump assembly
are not suitable for direct contact with swimming
pool
water.
Viessmann supplies the Solar-Divicon to simplify the
installation and the selection of pumps and safety
equipment. For construction and specification (see
pages 36 and 37).
Sizing the Circulation Pump
Note:
The table above is only to be used as a reference.
It is important to consider the pressure drop and
flow requirements of all components installed on
the system when sizing or selecting the circulation
pump.
Use Solar-Divicon DN20B
Use Solar-Divicon DN25B
Specific Flow Rate
Low Flow
High Flow
USG/min/ft
2
0.0102
0.0123
0.0143
0.0164
0.0184
0.0205
0.0225
0.0245
(L/h/m
2
)
(25)
(30)
(35)
(40)
(45)
(50)
(55)
(60)
USG/min
0.26
0.31
0.36
0.41
0.46
0.51
0.56
0.62
(L/min)
(1.0)
(1.2)
(1.4)
(1.6)
(1.7)
(1.9)
(2.1)
(2.3)
Number of
Collectors
Recommended flow rate for the number of collectors per individual array
USG/min (L/min)
1
Collector
0.26 (1.0)
0.31 (1.2)
0.36 (1.4)
0.41 (1.6)
0.46 (1.7)
0.51 (1.9)
0.56 (2.1)
0.62 (2.3)
2
Collectors
0.51 (1.9)
0.62 (2.3)
0.72 (2.7)
0.82 (3.1)
0.92 (3.5)
1.03 (3.9)
1.13 (4.3)
1.23 (4.7)
3
Collectors
0.77 (2.9)
0.92 (3.5)
1.08 (4.1)
1.23 (4.7)
1.39 (5.2)
1.54 (5.8)
1.69 (6.4)
1.85 (7.0)
4
Collectors
1.03 (3.9)
1.23 (4.7)
1.44 (5.4)
1.64 (6.2)
1.85 (7.0)
2.05 (7.8)
2.26 (8.5)
2.46 (9.3)
5
Collectors
1.28 (4.9)
1.54 (5.8)
1.80 (6.8)
2.05 (7.8)
2.31 (8.7)
2.56 (9.7)
2.82 (10.7) 3.08 (11.7)
6
Collectors
1.54 (5.8)
1.85 (7.0)
2.15 (8.2)
2.46 (9.3)
2.77 (10.5) 3.08 (11.7) 3.39 (12.8) 3.69 (14.0)
7
Collectors
1.80 (6.8)
2.15 (8.2)
2.51 (9.5)
2.87 (10.9) 3.23 (12.2) 3.59 (13.6) 3.95 (15.0) 4.31 (16.3)
8
Collectors
2.05 (7.8)
2.46 (9.3)
2.87 (10.9) 3.28 (12.4) 3.69 (14.0) 4.10 (15.5) 4.51 (17.1) 4.92 (18.6)
9
Collectors
2.31 (8.7)
2.77 (10.5) 3.23 (12.2) 3.69 (14.0) 4.16 (15.7) 4.62 (17.5) 5.08 (19.2) 5.54 (21.0)
10
Collectors
2.56 (9.7)
3.08 (11.7) 3.59 (13.6) 4.10 (15.5) 4.62 (17.5) 5.13 (19.4) 5.64 (21.4) 6.16 (23.3)
11
Collectors
2.82 (10.7) 3.39 (12.8) 3.95 (15.0) 4.51 (17.1) 5.08 (19.2) 5.64 (21.4) 6.21 (23.5) 6.77 (25.6)
12
Collectors
3.08 (11.7) 3.69 (14.0) 4.31 (16.3) 4.92 (18.6) 5.54 (21.0) 6.16 (23.3) 6.77 (25.6) 7.39 (28.0)
Design and Operation