Solar-assisted still with vapor-compression option

Abstract In this paper, a scheme is proposed where steam, generated from solar collectors, is used to drive a multiple-effect still with novel high performance rotating-disk wiped-film evaporators, thus resulting in an order of magnitude reduction of collector area. Mechanical energy to drive pumps and other accessories would be provided by a fuel-powered heat engine. During extended sunless periods, an engine drives a vapor compressor connected across some of the effects and keeps the plant operating at reduced capacity. Preliminary analysis indicate favorable economics for a medium capacity plant.