Waste heat recovery from large marine engine block: energy, exergy, economic and environmental (4E) assessment

Abstract

This study proposes an energy, exergy, economic and environmental (4E) method to examine the marine diesel engine, with emphasis on machines already in use. Real measurements and sampling of working fluids are taken in order to evaluate factual conditions of the engine studied. The analysis identifies and quantifies the amount of heat from the engine block and its attachments which is possible to recover, and looks into the cost reduction gained when this energy is reused. A cut in specific fuel consumption is directly reflected on the amount of CO2 and NOx emissions released and so are calculated.