(e) Solar Drying of Agricultural and Animal Products: During periods of inclement weather when solar radiations are low then the requirement for water pumping is also relatively less as the transpiration losses from the crops are also low. The requirement for water pumping is greatest in the hot summer months which coincide with the increased solar radiations during this period and so this method is most appropriate for irrigation purpose. In solar pumping, the power generated by solar-energy is utilized for pumping water for irrigation purposes. Per liter distilled water cost obtained by this system is cheaper than distilled water obtained by other electrical energy-based processes. The condensed water flows down the sloping roof and is collected in the troughs placed at the bottom and from there into a water storage tank to supply potable distilled water in areas of scarcity, in colleges, school science laboratories, defense labs, petrol pumps, hospitals and pharmaceutical industries. The vapors produced get condensed to form purified water in the cool interior of the roof. ![]() Solar radiation passes through the covers and is absorbed and converted into heat in the blackened surface causing the water to evaporate from the brine (impure saline water). In this method, solar radiation is admitted through a transparent air tight glass cover into a shallow blackened basin containing saline water. The abundant sunlight in these areas can be used for converting saline water into potable distilled water by the method of solar distillation. In arid semi and or coastal areas there is scarcity of potable water.
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