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Performance Analysis and Optimization of a Series Heat Exchangers Organic Rankine Cycle Utilizing Multi-Heat Sources
1The Institute of Power Drive and Control, Shanghai Maritime University, 1550 Haigang Ave., Shanghai 201306, China.
Entropy (Basel, Switzerland)
|August 6, 2021
Summary
This study optimizes the thermoeconomic performance of a Series Heat Exchangers Organic Rankine Cycle (SHEORC) for marine diesel engines. R245ca fluid demonstrated the best performance, with scavenge air and exhaust gas recovery yielding optimal results.
Area of Science:
- Marine Engineering
- Thermodynamics
- Energy Recovery
Background:
- Marine diesel engines generate significant waste heat.
- Organic Rankine Cycle (ORC) offers a viable solution for waste heat recovery.
- Series Heat Exchangers ORC (SHEORC) can integrate multiple heat sources.
Purpose of the Study:
- To analyze and optimize the thermoeconomic performance of a SHEORC for marine diesel engines.
- To investigate energy recovery from jacket water, scavenge air, and exhaust gas.
- To evaluate the impact of operational parameters on SHEORC performance.
Main Methods:
- Modeling and simulation of SHEORC with combined heat sources (JW→EG, SA→EG, JW→SA→EG).
- Single-objective optimization for power output.
- Multi-objective optimization for exergy efficiency and Levelized Cost of Energy (LCOE).
Main Results:
- Optimal heat recovery proportions exist for JW→EG and JW→SA→EG configurations.
- R245ca fluid exhibited superior thermoeconomic performance across all source combinations.
- SA→EG configuration achieved 354.19 kW power output, 59.02% exergy efficiency, and $0.1150/kWh LCOE.
- Integrating jacket water into SA→EG did not increase power output but reduced LCOE.
Conclusions:
- SHEORC is effective for waste heat recovery in marine diesel engines.
- Optimal operational parameters and heat source integration are crucial for maximizing SHEORC performance.
- R245ca is a promising working fluid for marine waste heat recovery applications.
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