Keywords: back wall temperature, sponge liners, thickness, yield, internal heat transfer, solar stills, conventional still, productivity, single slope, inner wall, solar energy, solar power, water distillation
The effect of sponge liner on the performance of simple solar still
In conventional solar stills, a part of the radiation is reflected by the inner wall surfaces to the still components and the remaining energy is stored by itself. The main objectives of this experimental study are: 1) to utilise the energy available on the inner wall surfaces of a still by using sponge liner; 2) to find the optimum thickness of sponge liner. Two single-slope solar stills are fabricated with an effective area of 0.5 m². The experiments were performed for various thicknesses of sponge liners. It is concluded that: 1) operating temperature of the sponge liner still components is lower than the conventional still components; 2) solar still with 5 mm thick sponge liner gives more yield than the other sponge liner; 3) the sponge liner still reduces the conduction heat losses from inner wall surface to outer wall surfaces through back wall and side wall by 50%.