TY - JOUR
T1 - Design Optimization of Supercritical Carbon Dioxide (s-CO2) Cycles for Waste Heat Recovery From Marine Engines
AU - Hossain, Md. Jubayer
AU - Chowdhury, Jahedul Islam
AU - Balta-Ozkan, Nazmiye
AU - Asfand, Faisal
AU - Saadon, Syamimi
AU - Imran, Muhammad
N1 - Publisher Copyright:
Copyright © 2021 by ASME.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - The global climate change challenge and the international commitment to reduce carbon emission can be addressed by improving energy conversion efficiency and adopting efficient waste heat recovery technologies. Supercritical carbon dioxide (s-CO2) cycles that offer a compact footprint and higher cycle efficiency are investigated in this study to utilize the waste heat of the exhaust gas from a marine diesel engine (Wärtsilä-18V50DF, 17.55 MW). Steady-state models of basic, recuperated, and reheated s-CO2 Brayton cycles are developed and optimized for network and thermal efficiency in Aspen Plus to simulate and compare their performances. Results show that the reheated cycle performs marginally better than the recuperated cycle accounting for the highest optimized network and thermal efficiency. For the reheated and recuperated cycle, the optimized network ranges 648–2860 kW and 628–2852 kW, respectively, while optimized thermal efficiency ranges are 15.2–36.3% and 14.8–35.6%, respectively. Besides, an energy efficiency improvement of 6.3% is achievable when the engine is integrated with an s-CO2 waste heat recovery system which is operated by flue gas with a temperature of 373 °C and mass flow rate of 28.2 kg/s, compared to the engine without a heat recovery system.
AB - The global climate change challenge and the international commitment to reduce carbon emission can be addressed by improving energy conversion efficiency and adopting efficient waste heat recovery technologies. Supercritical carbon dioxide (s-CO2) cycles that offer a compact footprint and higher cycle efficiency are investigated in this study to utilize the waste heat of the exhaust gas from a marine diesel engine (Wärtsilä-18V50DF, 17.55 MW). Steady-state models of basic, recuperated, and reheated s-CO2 Brayton cycles are developed and optimized for network and thermal efficiency in Aspen Plus to simulate and compare their performances. Results show that the reheated cycle performs marginally better than the recuperated cycle accounting for the highest optimized network and thermal efficiency. For the reheated and recuperated cycle, the optimized network ranges 648–2860 kW and 628–2852 kW, respectively, while optimized thermal efficiency ranges are 15.2–36.3% and 14.8–35.6%, respectively. Besides, an energy efficiency improvement of 6.3% is achievable when the engine is integrated with an s-CO2 waste heat recovery system which is operated by flue gas with a temperature of 373 °C and mass flow rate of 28.2 kg/s, compared to the engine without a heat recovery system.
KW - waste heat recovery (WHR)
KW - marine engine
KW - supercritical carbon dioxide (s-CO2)
KW - Brayton cycle
KW - Waste heat recovery (WHR)
KW - Supercritical carbon dioxide (s-CO )
KW - Marine engine
UR - http://www.scopus.com/inward/record.url?scp=85107889741&partnerID=8YFLogxK
U2 - 10.1115/1.4050006
DO - 10.1115/1.4050006
M3 - Article
VL - 143
JO - Journal of Energy Resources Technology, Transactions of the ASME
JF - Journal of Energy Resources Technology, Transactions of the ASME
SN - 0195-0738
IS - 12
M1 - 120901
ER -