Ashan and Fukuhara proposed a mass and heat
It was observed that Rotenone the values of internal convective heat transfer coefficient between water and inner glass surface (hc,w−g) based on the inner glass cover temperature are greater than the values based on the outer glass cover temperature. It is due to fact that (Tw−Tgi) is small but has higher operating temperature. The value of internal convective heat transfer coefficients evaluated by present model is much higher than value obtained by Dunkle’s model. Also the radiative and convective heat transfer coefficients do not vary significantly for both, the inner as well as the outer glass temperatures, unlike evaporative heat transfer coefficient for single as well as double slope multi wick solar stills. But the inner glass cover temperature for single slope multi wick solar stills is higher than outer glass cover temperature. It was concluded that in winter, single slope solar still gives higher efficiency in comparison with double slope solar still due to more reflection losses from double slope solar still and entropy is reversed in summer.