Abstract
Water from below ground level is to be raised, for the irrigation of a desert area near Cairo, Egypt, by harnessing solar power. The solar-energy collector is an array of gravity-return heat pipes, each surrounded by a cylindrical high-vacuum enclosure. The prime mover, in the form of a multi-vane expander, operates in an organic Rankine-cycle using trichlorotrifluoroethane as the working fluid. For specified conditions, the performances and optimal output temperatures of the collector (so that maximum overall efficiency of the system can be achieved) are predicted.
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