Global Journal of Researches in Engineering, A: Mechanical & Mechanics, Volume 22 Issue 1

cross section channel drainage provided below the glass lower edge on one sides. The distillates were collected in a bottle. However, MS-Excel/VBA computer program is used to predict the results of the developed energy balance model for all types of solar stills, which in turn require the computation of thermodynamic and transport properties for water/vapor substance the analytical results are obtained by solving of the energy balance equations for the basin plate, saline water and glass cover of the solar still. The temperature of saline water, basin plate and glass cover can be evaluated at every 30s. Figure 1: Schematic diagram of conventional solar still Figure 2: Schematic diagram of modified stepped solar still III. R esults and D iscussions Numerical calculations have been performed at the same conditions for three type of the solar still included modified stepped solar still, stepped solar still without modification, and conventional solar still. The variation of solar radiation, ambient temperature, water temperature and glass temperature of solar stills are shown in Figure 4. It is observed that the temperatures at all points increase as the time increase till a maximum value at noon and decrease after that. This is due to the increase of solar radiation intensity in the morning and its decrease in the afternoon. From the results shown in Figure 3, it is seen that the solar radiation achieve maximum values of 1100 W/m². Increase in solar radiation increases the saline water temperature. This in © 2022 Global Journals Global Journal of Researches in Engineering (A ) Volume XxXII Issue I Version I 14 Year 2022 Performance of a Modified Stepped Solar Still