Exergy analysis of a LPG fuelled, MPFI multi-cylinder engine with vaporized water methanol induction

Abstract

The influence of vaporized water methanol induction on a MPFI multi-cylinder engine performance and thermal balance has been experimentally investigated. A four stroke, four cylinder MPFI gasoline engine was used with LPG as fuel and vaporized water methanol. For the generation of vaporized water methanol, heat from the exhaust gas has been used. Different percentages of water methanol by mass basis were used with variable engine speed ranging from 2000 to 4500 rpm. The results showed that as the percentage water methanol induction level to the engine increased, there is slight increase in percentage of useful work, while the losses decreased except unaccounted losses. Additionally, the engine brake thermal efficiency increases. The average increase in the brake thermal efficiency for a 20% water methanol with LPG is approximately 1.5% over the use of LPG without water methanol induction.