Effect of Waste Heat Recovery System on Performance and Emission Characteristics of Spark Ignition (SI) Engine Fuelled with Neat Ethanol (E100)

The SI engine could not be operated efficiently with neat ethanol fuel due to its high self ignition temperature and latent heat of vaporization compared with petrol. The above issues of SI engine is turned to be an objective of this study, where the SI engine was operated with neat ethanol fuel under different inlet air temperatures. The result of this study is indicated that the neat ethanol fuel could be utilized efficiently in SI engine with waste heat recovery system. The specific fuel consumption (SFC) of SI engine has decreased with neat ethanol fuel compared with petrol fuelled engine. It is also found that the SI engine has registered almost same brake thermal efficiency (BTE) values with neat ethanol compared to petrol. The exhaust emissions such as carbon monoxide (CO) and Hydrocarbon (HC) were reduced in SI engine, at the same time there was an increase in oxide of nitrogen (NOx).