Solar PV water pumping study - FINAL REPORT ... - UNDP, Namibia

Feasibility Assessment for the Replacement of Diesel Pumps with Solar Pumps
Table 3.9: Unit water cost for PVPs
Head [m]
FINAL REPORT: September 2006
Daily volume flow [m³/day]
[m] 3 6 8 13 17 25 33 50
20 6.33
40 5.64
60 6.09
80 6.49
120 7.59
160 7.78
200 8.77
3.38
3.15
3.51
3.96
4.82
2.09
2.53
2.86
3.33
4.50
1.54
1.90
2.21
2.93
4.38
1.27
1.59
2.49
2.98
5.04
0.99
1.65
1.97
3.18
4.31
0.85
1.40
2.38
2.75
0.87
1.57
2.08
2.43
No PVP No PVP
No PVP No PVP No PVP No PVP No PVP No PVP No PVP
No PVP No PVP No PVP No PVP No PVP No PVP No PVP
The UWCs of DPs are listed in Table 3.10. The same pricing trends are observed as for the
UWCs of PVPs, i.e. the UWC at high head and low volume has the highest value and the
UWC at lowest head and highest daily flowrate has the lowest value.
Table 3.10: Unit water costs for DPs
Head [m]
Figure 3.17 graphically presents selected heads and daily flowrates for PVPs. The trends
show that:
Unit Water Cost [N$/m³]
• The cost of water increases with increasing head.
• The UWCs are high for low volume applications.
• The UWCs at daily flowrates above 8m 3 /day are similar.
10.00
8.00
6.00
4.00
2.00
-
Daily volume flow [m³/day]
[m] 3 4 6 8 13 17 25 33 50
20 31.72
40 32.09
60 32.47
80 32.84
120 33.58
160 34.32
200 35.07
23.81
24.09
24.37
24.65
25.20
25.76
26.32
15.89
16.07
16.26
16.44
16.82
17.19
17.69
11.92
12.06
12.20
12.34
12.62
13.44
14.48
40 80 120 160 200
Head [m]
Figure 3.17: Unit Water Cost of PVPs at selected heads
3 m³/day
8 m³/day
12 m³/day
25 m³/day
Figure 3.18 graphically presents selected heads and daily flowrates for DPs. The trends
show that:
10.98
11.07
11.17
11.26
11.45
12.17
13.13
8.23
8.30
8.37
8.44
9.24
10.19
11.26
5.50
5.56
5.74
6.24
7.28
8.55
9.43
4.77
4.81
4.97
5.45
6.49
7.83
8.68
3.18
3.47
3.99
4.57
5.81
7.15
8.02
Page 37 of 76