By Jeff Kenna, Bill Gillet
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Additional info for Solar Water Pumping: A Handbook
The amount of water that the pump can provide in excess of the requirements, and it may be possible to use the potential excess electrical output from the PV array to drive other loads. For solar pumps operating in an energy saving mode it is essential to calculate the output in the remaining months so that the unit water cost can be assessed. 81 x system head (m) Monthly o~z wind sp8ed (m3/day) 4. 1, Methodologies for Economic Evaluation Economic considerations are important when comparing alternative pumping methods.
For the stand alone system the design month is found by calculating the ratio of the hydraulic energy requirement to the solar energy available for each month. The month in which this ratio is a maximum is the design month. For a fuel saving system, the baseline requirement needs to be established. For example, this could be the average water requirement throughout the year. Then the ratio of the baseline hydraulic energy to the solar energy available can be calculated for each month. Again the month with the maximum ratio is the design month.
PV array tilt . . . *................. &O. . . qg. % Motor Rated Power . . . . . . &$?. lQ. lit/see at g:& m head Table 10. Format sheet for Specification of Solar Pump Performance 50 The selection of a suitable subsystem configuration can be carried out with reference to Figure 12. 2 m, either a submerged or surface centrifugal pump would be suitable. it is not necessary to calculate the output in the remaining 11 months for stand alone systems because it is known that the Mar pump can provide the annual demand (the pump has been sized to meet the ‘worstf month water demand).