الفهرس 
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Abstract
The aim of this work is to utilize the heat energy wasted in exhaust gas and jacket water of a diesel engine for desalination using a modified single slope solar still, without the aid of any external energy used for pumping system. The heat extracted from both the exhaust and the jacket water was simulated by using a heater and a thermostat adjusted at 90 oC. In this work a horizontal pipe and a heat exchanger is used with a single slope solar still to increase the condensation of the water vapor in the still. Four main cases at three different temperatures was applied to investigate the best modification for the still. In all cases the still was filled with 7 cm of raw water. In the first case the raw water was at the ambient temperature. The heater, the heat exchanger fan, and the control valves were closed and the productivity of the desalinated water was between 4 to 4.3 Liter/day. In the second case the raw water was at 90 oC as the heater was on. Both the heat exchanger fan and the control valves were closed. The productivity in this case was between 4.5 to 4.7 Liter/day. In both cases three and four the raw water was at 90 oC, the control valves were opened to allow the water to flow in the hoses. But in case three the fan was opened while it was closed in case four. The productivity for both cases were between 5 to 5.3 and between 5.7 to 5.9 Liter/day, respectively. Both economic and enviroeconomic analyses were obtained for the solar still. It was found that the cost of the desalinated water per liter is estimated to be 0.94 L.E and the carbon credit earned is about 2112 L.E for the lifetime of the solar still.