TY - GEN
T1 - Thermo-Economic Analysis and Optimization through Genetic Algorithm of a Dual-Loop Regenerative Supercritical CO2 Brayton Cycle/ORC System Coupled to the Main Diesel Engine of a Bulk Carrier
AU - Vallis, Athanasios G.
AU - Zannis, Theodoros C.
AU - Pariotis, Efthimios G.
AU - Spandonidis, Christos C.
AU - Yfantis, Elias A.
AU - Alexiou, Kiriakos
AU - Rakopoulos, Dimitrios C.
N1 - Publisher Copyright:
© Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.
PY - 2022
Y1 - 2022
N2 - In the present study, an energy and exergy analysis of a dual-loop regenerative supercritical CO2 Brayton cycle (RSCBC)/ORC system, which harvests waste heat from the exhaust gases and the intercooler of a main marine diesel engine of a bulk carrier, was performed. A thermal analysis was also conducted to calculate the main dimensions of the heat exchangers of the bottoming system. An economic analysis was performed to calculate the capital cost of each component of the bottoming cycle, the total capital cost of the RSCBC/ORC installation, and the electricity production cost (EPC). An integrated thermo-economic model was developed comprised of the thermodynamic model, the heat transfer analysis model, and the economic analysis model. A genetic optimization algorithm was imposed to the thermo-economic model, and it was used to run various scenarios with variable dual loop cycle parameters and as main objective to minimize the EPC of the proposed system. The optimum RSCBC/ORC system was then used to perform a mission analysis of 7500 hours of the examined bulk carrier to calculate the fuel savings, and the CO2 and SO2 emission savings for maritime fuels with different bunkering costs. The results showed that the proposed marine RSCBC/ORC system can result in considerable fuel savings from the auxiliary engines. The proposed RSCBC/ORC system can result in the significant reduction of a bulk carrier CO2 and SO2 emissions. Finally, it was found that the fuel bunker cost directly affects the capital cost and the payback period of the waste heat recovery installation.
AB - In the present study, an energy and exergy analysis of a dual-loop regenerative supercritical CO2 Brayton cycle (RSCBC)/ORC system, which harvests waste heat from the exhaust gases and the intercooler of a main marine diesel engine of a bulk carrier, was performed. A thermal analysis was also conducted to calculate the main dimensions of the heat exchangers of the bottoming system. An economic analysis was performed to calculate the capital cost of each component of the bottoming cycle, the total capital cost of the RSCBC/ORC installation, and the electricity production cost (EPC). An integrated thermo-economic model was developed comprised of the thermodynamic model, the heat transfer analysis model, and the economic analysis model. A genetic optimization algorithm was imposed to the thermo-economic model, and it was used to run various scenarios with variable dual loop cycle parameters and as main objective to minimize the EPC of the proposed system. The optimum RSCBC/ORC system was then used to perform a mission analysis of 7500 hours of the examined bulk carrier to calculate the fuel savings, and the CO2 and SO2 emission savings for maritime fuels with different bunkering costs. The results showed that the proposed marine RSCBC/ORC system can result in considerable fuel savings from the auxiliary engines. The proposed RSCBC/ORC system can result in the significant reduction of a bulk carrier CO2 and SO2 emissions. Finally, it was found that the fuel bunker cost directly affects the capital cost and the payback period of the waste heat recovery installation.
KW - Brayton cycle
KW - CO2
KW - Dual loop
KW - Optimization, Ship energy efficiency
KW - ORC
KW - Regeneration
KW - Supercritical
UR - http://www.scopus.com/inward/record.url?scp=85195778235&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85195778235
T3 - Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
SP - 2105
EP - 2116
BT - Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
A2 - Elmegaard, Brian
A2 - Sciubba, Enrico
A2 - Blanco-Marigorta, Ana Maria
A2 - Jensen, Jonas Kjaer
A2 - Markussen, Wiebke Brix
A2 - Meesenburg, Wiebke
A2 - Arjomand Kermani, Nasrin
A2 - Zhu, Tingting
A2 - Kofler, Rene
PB - DTU Construct
T2 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2022
Y2 - 3 July 2022 through 7 July 2022
ER -