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Figure 11.17. Power demand, as a function of time, for optimal operation of a
                                 typical water pumping system with limited water source replenishment rate. The
                                 requirements for increased power result from falling water level (Baltas et al.,
                                 1988, Used with kind permission from Springer Science and Business Media.)





























                                 Figure 11.18. Solar radiation received on an inclined plane throughout a clear
                                 sunny day.






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