NDLI: An Engine Exhaust Utilization System by Combining $CO_{2}$ Brayton Cycle and Transcritical Organic Rankine Cycle

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An Engine Exhaust Utilization System by Combining $CO_{2}$ Brayton Cycle and Transcritical Organic Rankine Cycle

Content Provider	MDPI
Author	Ma, Haoyuan Liu, Zhan
Copyright Year	2022
Description	For engine exhaust gas heat recovery, the organic Rankine cycle (ORC) cannot be directly used due to the thermal stability and safety of organic fluids. Thus, a creative power system is given by integrating the supercritical $CO_{2}$ Brayton cycle and transcritical ORC. This system can directly utilize the thermal energy of a high-temperature exhaust gas. The inefficiencies in the heat exchangers are highly reduced by using supercritical working fluid. The mathematical model of the system, covering both the thermodynamic and economic aspects, is built in detail. It is found that the highest irreversible loss takes place in the gas heater, taking 21.14% of the total exergy destruction. The ORC turbine and $CO_{2}$ turbine have the priority for improvement, compared to the compressor and pump. The increase in $CO_{2}$ turbine inlet pressure improves the system exergy efficiency and levelized cost of energy. Both the larger $CO_{2}$ and ORC turbine inlet temperatures contribute to a decrease in levelized cost of energy and a rise in system exergy efficiency. There is a maximum value of system exergy efficiency and minimum value of levelized cost of energy by varying the ORC turbine inlet pressure. The determined exergy efficiency and levelized cost of energy in the proposed system are 54.63% and 36.95 USD/MWh after multi-objective optimization.
Starting Page	1276
e-ISSN	20711050
DOI	10.3390/su14031276
Journal	Sustainability
Issue Number	3
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2022-01-24
Access Restriction	Open
Subject Keyword	Sustainability Industrial Engineering Engine Waste Heat Recovery Co2 Brayton Cycle Transcritical Orc Cycle Multi-objective Optimization Thermal and Economic Analysis
Content Type	Text
Resource Type	Article

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