A newly designed vertical multiple-effect-diffusion type solar still coupled with heat-pipe solar collector (2nd Report: Effect weather conditions on still's productivity)

摘要

We numerically analyzed a vertical multiple-effect-diffusion type solar still coupled with heat-pipe solar collector, which has some advantages: the still's size is compact, the still can produce distilled water without electricity, and the productivity is greater than that of conventional multiple-effect-diffusion type stills. We theoretically predicted the optimum angles of the solar collector in the spring and autumn equinox and the summer and winter solstice days, and we also performed parametric investigations of some conditions, such as ambient temperature, wind velocity, temperature of feeding saline water to wicks, and the number of partitions, to determine the effect of these parameters to still's productivity. It is found that at large number of partitions in the multiple-effect still, it is better to use a simple and inexpensive device which can increase temperature of the feeding saline water to wicks about 10 K rather than to increase the number of costly partitions to improve the still's productivity.