Thermodynamic analysis on the combination of supercritical carbon dioxide power cycle and transcritical carbon dioxide refrigeration cycle for the waste heat recovery of shipboard

2020 ◽  
Vol 221 ◽  
pp. 113214 ◽  
Author(s):  
Aofang Yu ◽  
Wen Su ◽  
Xinxing Lin ◽  
Naijun Zhou ◽  
Li Zhao
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Thermodynamic Analysis ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Refrigeration Cycle ◽  
Power Cycle ◽  
Transcritical Carbon Dioxide ◽  
Supercritical Carbon

scholarly journals Design optimization of supercritical carbon dioxide (s-CO2) cycles for waste heat recovery from marine engines

2021 ◽  
pp. 1-44
Author(s):  
Md. J. Hossain ◽  
Jahedul Islam Chowdhury ◽  
Nazmiye Balta-Ozkan ◽  
Faisal Asfand ◽  
Syamimi Saadon ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
State Models ◽  
Supercritical Carbon

Abstract 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 optimised for net work 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 optimised net-work and thermal efficiency. For the reheated and recuperated cycle, the optimized net-work ranges from 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.

Thermodynamic analysis of a novel dual expansion coal-fueled direct-fired supercritical carbon dioxide power cycle

2018 ◽  
Vol 217 ◽  
pp. 480-495 ◽  
Author(s):  
Yongming Zhao ◽  
Lifeng Zhao ◽  
Bo Wang ◽  
Shijie Zhang ◽  
Jinling Chi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Thermodynamic Analysis ◽  
Power Cycle ◽  
Supercritical Carbon
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