Recent trend about the best ways of using the deployable sources of energy in to useful work in order to reduce the rate of consumption of fossil fuel as well as pollution. Out of all the available sources, the internal combustion engines are the major consumer of fossil fuel around the globe. Out of the total heat supplied to the engine in the form of fuel, approximately, 30 to 40% is converted into useful mechanical work. The remaining heat is expelled to the environment through exhaust gases and engine cooling systems. Therefore we have to utilise this energy. This paper includes Utilising the waste energy by using the vapour absorption system and exhaust gas recirculation system. Vapour absorption system required low grade energy for operation. Hence in such types of systems, a physicochemical process replaces the mechanical process of the vapour compression refrigeration system by using energy in the form of heat rather than mechanical work. This heat obtained from the exhaust of high power internal combustion engines. And also using the Exhaust Gas Recirculation NOx is to be control. The exhaust gases mainly consist of carbon dioxide, nitrogen etc. and the mixture has higher specific heat compared to atmospheric air. Re-circulated exhaust gas displaces fresh air entering the combustion chamber with carbon dioxide and water vapour present in engine exhaust. As a consequence of this air displacement, lower amount of oxygen in the intake mixture is available for combustion.