Experimental investigation on innovatory waste heat recovery system impacts on DIESEL engine exhaust emissions

Globally compression ignition engines are one of the major pollutants that fuel the environmental imbalance through exhaust emissions. So, this article explores the impact of innovative waste heat recovery from diesel engine harmful exhaust emissions. A double pipe, externally internally protracted finned counter flow heat exchanger (PFCHE) was innovatively planned, partially coated and tested with binary mixtures as working fluids to harvest the engine exhaust heat. The PFCHE employed, resulted in considerable amount of reduction in the emissions from engine which can be attributed to partial coating of gamma-alumina diesel oxidation catalyst. The experimental result showed that there is a decline in the emissions of nitrogen oxides, carbon monoxide and hydrocarbons with partially coated PFCHE. The investigation confirmed the reduction of hydrocarbons and NOx emissions up to16% and 7% respectively at full load conditions, when compared with standard engine operations, excluding heat exchanger. There was a decrement in smoke from 60HSU to 40HSU at the time of full load engine operation. According to the results achieved from the current study, it can be inferred that the partially coated PFCHE could be an optimum heat exchanger for exhaust heat energy recovery as well as it can reduce the emissions from engine exhaust.