We show how the thermal losses within and outside a solar distillation unit vary with water depth in the basin of a passive solar still. The latent heat of vaporisation has been used for distillation under both passive and active modes of operation. The flow rate of the water mass over the glass...

We analyse the performance of a flat-plate collector with a constant rate of evaporation of flowing water between a glass cover and an absorbing plate. The effects of fluid-flow velocity, depth of fluid and length of the absorbing surface are discussed. We have allowed for periodic variation of...

An analysis is presented for the performance of an inexpensive sand collector for solar energy which has been validated experimentally. The collector consists of a plane network of polythene pipes buried in a sand mass which is kept in a wooden case, the top surface of the sand being fixed by...