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Lot of waste heat in the temperature range 350-400°C is available from I.C. engine exhaust. The same can be utilized for the operation of a triple effect absorption system which requires heat from a high temperature heat source. In this paper, the energy and exergy analysis of series flow triple effect water-lithium bromide absorption systems is presented assuming engine exhaust as a heat source. A computational model has been developed for the parametric investigation of the system. The analysis involves the determination of effects of generator and absorber temperatures on the energetic and exergetic performance of the system. The performance parameters computed are coefficient of performance, exergetic efficiency and the cooling capacity.

Presence of smoke in diesel engine exhaust is an indication of poor combustion due to several factors. Nevertheless, with an ever increasing concern for the impact of air pollution on environment, animal and plant life, vehicle exhaust emissions, particularly due to road transport, have, in recent years been subjected to increasingly stringent regulations. The environmental pollution can be controlled by utilization of clean fuel such as CNG (Compressed Natural Gas). The present work was carried out on a 7.35 kW four-stroke, twin cylinder, direct injection (DI) diesel engine which was operated in dual fuel mode with substitution of up to 75% diesel with CNG. It was observed that the substitution of CNG reduced the noise level, specific fuel consumption, NOx, however increased the unburned hydrocarbons.

Turbochargers are being used as an integral part in diesel engines to reduce the pollution on one hand and to improve the performance at low engine speed on the other hand. The intake of the turbocharger is of annular diffuser type. The present work is intended to explore the aerodynamics of axial annular diffuser with the help of 2D axisymetric turbulence kinetic energy (k) and its dissipation rate (ε) computational fluid dynamics (CFD) model. The behaviour of subsonic turbulent flow of air inside the annular diffuser with central cylindrical hub and diverging casing has been analyzed. The analysis has been carried out with experimentally validated model for various inlet swirl velocity profiles.