Potential for efficiency improvement of four-stroke marine diesel gensets by utilisation of exhaust gas energy. (2016)

• Record Type: Journal Article
• Authors: Hountalas, Dimitrios T.; Mavropoulos, Georgios C.; Katsanos, Christos; Daniolos, Stavros; Dolaptzis, Iosif; Mastorakis, Nikolaos
• Is Part Of: International journal of global warming. Volume 10:Number 1/2/3(2016)
• Page Start: 133
• Page End: 157
• Publication Date: 2016
• Subjects: Rankine cycle -- four-stroke diesel engines -- heat recovery -- exhaust gas -- engine efficiency -- marine engines -- diesel auxiliary units -- thermodynamics -- simulation -- modelling -- auxiliary engines -- commercial vessels; Global warming -- Periodicals; Global warming -- Statistics -- Periodicals; Global warming -- Economic aspects -- Periodicals; Climatic changes -- Periodicals; Climatic changes -- Economic aspects -- Periodicals; Climatic changes -- Environmental aspects -- Periodicals; 363.73874
• Languages: English
• ISSNs: 1758-2083

Abstract

In the present paper, it is examined the potential application of a Rankine cycle exhaust gas heat recovery system which recovers and utilises energy from the exhaust gas of four-stroke marine diesel auxiliary unit before it is released to the atmosphere, increasing thus its total efficiency. For this purpose, a thermodynamic simulation model of the Rankine bottoming cycle is used. Heat utilisation is initially considered only from the main exhaust gas stream after the T/C turbine. As reference for the investigation are used the values from the official shop tests at various loads ranging from 25% up to 100%. From these using the Rankine cycle simulation model, it is investigated the potential for increase of generated cycle power output and optimisation of its efficiency. In addition, it is examined the effect of working media by considering steam and an organic. The results derived reveal that there exists a significant potential for fuel saving by utilisation of exhaust gas energy of auxiliary engines installed on commercial vessels.