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Total Dynamic Head

Total Dynamic Head is calculated by adding together the static lift (from the ground level at the solar array or windmill to the low water level), the static height ( from ground level at the solar array or windmill to the delivery tank), and Friction Loss( the resistance to water flow expressed as height) in the delivery pipeline.

If you know your Total Dynamic Head (T.D.H) and the volume you require per day. It will be easy to determine the best system to suit your need.

 
Friction Loss for Rural "B" Imperial Polyethylene Pipe
Litres per day
Litres
per
Second
Friction Loss Number (Metres per 1000 Metres of Pipeline)
Windmill
 
Solar Fixed Array
Solar Tracking Array
1/2"
3/4"
1"
1.1/4"
1.1/2"
2"
2160
 
1296
1728
0.06
34.0
4.9
1.2
     
2880
 
1728
2304
0.08
58.0
8.4
2.1
     
3600
 
2160
2880
0.10
84.0
12.0
3.2
1.0
   
7200
 
4320
5760
0.20
295.0
43.0
10.5
3.5
1.5
 
10800
 
6480
8640
0.30
590.0
86.0
20.4
7.5
2.9
 
14400
 
8640
11520
0.40
 
150.0
37.0
12.2
4.8
1.3
18000
 
10800
14400
0.50
 
205.0
54.0
18.5
7.1
1.9
21600
 
12960
17280
0.60
 
290.0
75.0
20.5
10.0
2.6
25200
 
15120
20160
0.70
 
380.0
96.0
32.0
12.8
3.4
28800
 
17280
23040
0.80
 
490.0
120.0
42.0
16.5
4.3
32400
 
19440
25920
0.90
 
600.0
145.0
51.0
21.0
5.2
36000
 
21600
28800
1.00
 
750.0
180.0
62.0
25.0
6.2
43200
 
25920
34560
1.20
   
250.0
85.0
34.0
8.5
50400
 
30240
40320
1.40
   
340.0
115.0
44.0
11.5
Friction Loss for Metric - Class PN 6.3 - Polyethylene Pipe
Litres per day
Litres
per
Second
Friction Loss Number (Metres per 1000 Metres of Pipeline)
Windmill
 
Solar Fixed Array
Solar Tracking Array
20mm
25mm
32mm
40mm
50mm
63mm
2160
 
1296
1728
0.06
7.9
2.2
0.6
     
2880
 
1728
2304
0.08
13.5
3.7
1.1
     
3600
 
2160
2880
0.10
20.3
5.7
1.6
0.5
   
7200
 
4320
5760
0.20
73.5
20.4
5.7
1.9
0.6
 
10800
 
6480
8640
0.30
155.7
43.3
12.2
4.1
1.4
 
14400
 
8640
11520
0.40
 
73.8
20.7
6.9
2.3
0.7
18000
 
10800
14400
0.50
 
111.6
31.3
10.5
3.5
1.0
21600
 
12960
17280
0.60
 
156.4
43.9
14.7
4.9
1.4
25200
 
15120
20160
0.70
 
208.1
58.4
19.5
6.6
1.8
28800
 
17280
23040
0.80
 
266.4
74.8
25.0
8.4
2.2
32400
 
19440
25920
0.90
 
331.4
93.0
31.1
10.5
2.7
36000
 
21600
28800
1.00
 
402.8
113.1
37.7
12.7
3.3
43200
 
25920
34560
1.20
   
158.5
52.9
17.8
4.5
50400
 
30240
40320
1.40
   
210.9
70.4
23.7
5.9
     

 

 

 

 

 


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