Thermo-environmental analysis and performance optimisation of transcritical organic Rankine cycle system for waste heat recovery of a marine diesel engine

Energy efficient and environmentally friendly shipping have been primary concerns for the maritime industry. One of the alternatives to overcome these issues onboard is organic Rankine cycle (ORC) waste heat recovery system (WHRS). In this study, a transcritical ORC WHRS for a marine diesel engine i...

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Bibliographic Details
Published in:Ships and offshore structures 2021-11, Vol.16 (10), p.1104-1113
Main Authors: Akman, Mehmet, Ergin, Selma
Format: Article
Language:English
Subjects:
Carbon dioxide
Diesel engines
Energy efficiency
environmental analysis
Environmental factors
Exergy
exergy analysis
Exhaust emissions
Exhaust gases
Genetic algorithms
Heat
Heat recovery
Heat recovery systems
marine diesel engine
Marine engines
Optimization
Rankine cycle
Recovery
Shipping
Thermodynamic efficiency
Transcritical organic Rankine cycle
Waste heat
Waste heat recovery
Waste recovery
Working fluids
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Summary:Energy efficient and environmentally friendly shipping have been primary concerns for the maritime industry. One of the alternatives to overcome these issues onboard is organic Rankine cycle (ORC) waste heat recovery system (WHRS). In this study, a transcritical ORC WHRS for a marine diesel engine is investigated at different engine operating loads by thermodynamic and environmental analysis. The engine exhaust gas is used as the waste heat source and R152a is selected as the working fluid. The energetic, exergetic and environmental parameters are analysed and the performance optimisation is conducted by using genetic algorithm. The results indicate that by employing the ORC system onboard, it is possible to increase the overall thermal efficiency of the ship power generation system by more than 2.5% and the system can save up to 678.1 tonnes CO 2 per year when the system is operated at the optimal conditions.
ISSN:1744-5302
1754-212X
DOI:10.1080/17445302.2020.1816744