Solar PV water pumping study - FINAL REPORT ... - UNDP, Namibia
Solar PV water pumping study - FINAL REPORT ... - UNDP, Namibia
Solar PV water pumping study - FINAL REPORT ... - UNDP, Namibia
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Feasibility Assessment for the Replacement of Diesel Pumps with <strong>Solar</strong> Pumps<br />
Table 3.7: Reference case parameters<br />
<strong>FINAL</strong> <strong>REPORT</strong>: September 2006<br />
Parameter Value<br />
Customer PRIVATE<br />
<strong>Solar</strong> irradiation 6 kWh/m 2 /day<br />
Tracking Fixed array<br />
Existing diesel pump installation No<br />
Type of diesel engine Short life<br />
Diesel price 6.70 N$/litre<br />
Distance to site 300km<br />
Distance to service 100km<br />
Cost contribution to fuel transport 20%<br />
Number of fuel transport trips per annum 6<br />
Distance to remote pump 3km<br />
Cost contribution to transport to remote pump 50%<br />
The <strong>pumping</strong> schedule of the diesel pump is varied to allow for a reasonably efficient system.<br />
For low daily flowrates of 3 to 10m 3 /day the <strong>pumping</strong> schedule for the DP results in operation<br />
on every second day which impacts positively on PRIVATE systems as there will be less<br />
driving. For daily flowrate above 10m 3 /day the DP is operated every day. In both cases the<br />
hours of operation is altered so that the DP reaches a reasonable system efficiency of above<br />
10%.<br />
The financial parameters as listed in Table 3.6 are part of the reference case.<br />
3.1.6.2 Variations<br />
Variations in the parameters listed in Table 3.7 and Table 3.6 can be undertaken for specific<br />
cases. The variations which will be considered for this <strong>study</strong> are as follows:<br />
• Diesel price variations at zero escalation – what is the factor by which the breakeven<br />
changes,<br />
• Private installation with tracking,<br />
• Private vs. DRWS installation,<br />
• DRWS design criteria: 10 hours every day.<br />
3.1.6.3 Assumptions and errors<br />
The assumptions for the costing calculations are as follows:<br />
• The boreholes have a sufficiently strong yield to allow for the generally higher<br />
flowrates of the diesel pump in comparison to the <strong>PV</strong>P.<br />
• The <strong>water</strong> in the borehole is of reasonable quality.<br />
• The sizing of a diesel system which results in under-loading the unit does not<br />
negatively impact on the life expectancy of the unit, nor does it change the service<br />
intervals (in terms of decarbonisation).<br />
• The “non-linearity” factor of taper thread rising main pipes does not lead to more than<br />
5% losses.<br />
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