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b. Direct pool heating system
For direct pool heating systems, it is recommended to use PVC pressure pipes with anti-UV treatment. For aesthetic
reasons, it is possible to paint the PVC pipes: in this case, use a good quality paint, anti-UV if possible.
5.1.3.2 Selecting the hydraulic transfer lines diameter
The diameters shown in the following tables are indicative for standard installations. For more complex installations,
the required diameter should be calculated according to the pressure losses of the solar field and the pipes.
a. Pressurised system – DHW – Nominal flow rate = 32 L/h/panel
Installation, operation and maintenance instructions - DualSun XXXM – 60 – 3BBP
1
2
3
4
1
1
2
3
4
2
2
4
6
8
3
3
6
9
12
4
4
8
12
16
5
5
10
15
20
6
6
12
18
24
DN multilayer
DN16 DN20 DN26 DN32 DN40 DN50
1
2
3
4
1
1
2
3
4
2
2
4
6
8
3
3
6
9
12
4
4
8
12
16
5
5
10
15
20
6
6
12
18
24
DN Copper
DN14 DN18 DN22 DN28 DN32 DN42
1
2
3
4
1
1
2
3
4
2
2
4
6
8
3
3
6
9
12
4
4
8
12
16
5
5
10
15
20
6
6
12
18
24
DN Stainless steel DN12 DN16 DN20 DN25 DN32 DN40
Number of strings
5
6
7
5
6
7
10
12
14
16
15
18
21
24
20
24
28
32
25
30
35
40
30
36
42
48
Number of strings
5
6
7
5
6
7
10
12
14
16
15
18
21
24
20
24
28
32
25
30
35
40
30
36
42
48
Number of strings
5
6
7
5
6
7
10
12
14
16
15
18
21
24
20
24
28
32
25
30
35
40
30
36
42
48
V1.2 – March 2020
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9
10
8
9
10
18
20
27
30
36
40
45
50
54
60
8
9
10
8
9
10
18
20
27
30
36
40
45
50
54
60
8
9
10
8
9
10
18
20
27
30
36
40
45
50
54
60
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