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(c)   Explain the relevance of the different water source types to
                                  component selection in corresponding photovoltaic water pumping
                                  systems.
                     11.6   (a)   For photovoltaic water pumping, when would you use a positive
                                  displacement pump in preference to a centrifugal pump?
                            (b)   How are the general characteristics of displacement pumps different
                                  from those of centrifugal pumps?

                            (c)   How do these differences affect photovoltaic system design and
                                  operating performance?

                     11.7   (a)   What are the advantages and disadvantages of using batteries in
                                  photovoltaic water pumping systems?
                            (b)   When is it necessary to use batteries in such systems and, in each
                                  case, what are the necessary battery characteristics and why?



                                                REFE RE NCES
                     Updated World Wide Web links can be found at www.pv.unsw.edu.au/apv_book_refs.

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                     Baltas, P., Russel, P.E. & Byrnes, C.I., (1988), ‘Analytical techniques for the
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                     Conference, Florence, Italy, pp. 401–405, Fig. 2, published by Springer and originally
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                     Barlow, R., McNelis, B. & Derrick, A. (1993), Solar Pumping. An Introduction and
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                     1, published by Springer and originally by “Kluwer Academic Publishers”
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                     Conference, Montreux, Switzerland, pp. 1403–1406.
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                     Cultura, A.B.I. (2004), ‘Comparative analysis of the dynamic performance of a DC
                     series and a DC shunt motor directly coupled with a solar-powered water pumping
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