Waste Heat Recovery Potential from Internal Combustion Engine Exhaust Gases
Abstract
Modern internal combustion engines (ICEs) are widely used in transport vehicles, marine, industrial and power generation applications. It is well known that less than a third of the thermal energy input of fuel is transformed into mechanical power, almost 60–70% is wasted as heat through exhaust and cooling systems. This work considers the possibility of utilizing high temperature exhausts, which usually can range from 400°C up to 900°C by modern WHR systems. Experimental investigations and CFD analysis were carried out for different systems such as Organic Rankine Cycles (ORCs), Thermoelectric Generators (TEGs) and combined topping-bottoming cycles. According to results, thermal utilization efficiencies of about 33% were reached by well-designed multi-compartment heat exchangers at peak load conditions. A combined system of shell-and-tube heat exchanger with secondary mechanical recovery achieved improvements in brake thermal efficiency by 0.89% and reduction in brake specific fuel consumption (BSFC) by 5.28g/kWh. This paper presents the thermodynamic, economic and environmental benefits of exhaust waste heat recovery systems.Abstract not available
Keywords
Waste Heat Recovery, Internal Combustion Engine, Exhaust Gases, Thermoelectric Generator