Abstract

A method enabling retrofitting of solar collectors to existing domestic, low pressure electric water heaters has been developed and tested. The performance of the proposed system was found to be comparable with the performance of conventional solar water heaters when the size of the solar collectors is suitably matched to the average daily consumption of hot water. Other developments described are a solar energy operated pump and an airlift pump, both suitable for circulation of water in domestic solar water heaters, and an electronic controller for the circulating pumps.

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