Abstract
Abstract─Medium-speed Diesel engine is one of the most important heat engines in a different fields of the power plants, such as, electric power generation and marine prime movers. In this paper, a medium-speed M.A.N production engine company with a turbocharger and an inter-cooler was selected to be modeled and simulated. FORTRAN language based on internal combustion engine applied thermodynamics is used to study theoretically the effect of the air temperature entering the engine cylinder from the inter-cooler on the volumetric efficiency. The results show that, the effect of air temperature from the inter-cooler to the engine cylinder has a significant impact on the engine performance. From results, the volumetric efficiency has increased by about 98% when operating at low exit air temperature of the inter-cooler with turbocharger system, this increase in the volumetric efficiency resulted in an increase in the indicated power (Pi) of the engine by about 107%. The rate of indicated specific fuel consumption (ISFC) of the engine also has been affected strongly by the air temperature entering the engine cylinder, at low air temperature from the inter-cooler to the engine cylinder, the indicated specific fuel consumption of the engine is decreased by more than 4% per cylinder. Index Terms:Diesel Engine; Turbo-charger; Inter-Cooler; Volumetric Efficiency.