This study deals with the thermodynamic analysis of a compression ignition (CI) engine coupled with a longitudinal triangular finned tube construction in a shell and tube heat exchanger which has segmental baffle cut of 50% at 20° slope and a latent heat thermal storage (LHTS) unit, using nano-enhanced organic phase change material (NeOPCM) for improved exhaust waste heat recovery process. The exergy is an effective method to estimate the quantity and quality of energy recovered from the CI engine and stored in the LHTS unit. The results show that nearly 82% of the energy from the engine exhaust is successfully recovered and stored in a heat exchanger with NeOPCM based LHTS unit. The thermodynamic balance of the exergy and energy for the complete system is calibrated and represented by applying the respective data from the Sankey heat flow balance diagrams. The maximum percentages of the energy and exergy saved from the diesel fuel by the LHTS unit using NeOPCM combined with heat exchanger are nearly 24% and 41% more than those of the virgin paraffin wax.
