Journal
ENTROPY
Volume 14, Issue 3, Pages 491-504Publisher
MDPI AG
DOI: 10.3390/e14030491
Keywords
organic Rankine cycle; OET; second law efficiency; waste heat temperature; pinch temperature difference; waste heat recovery
Categories
Funding
- National Basic Research Program of China (973 Program) [2011CB710701]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20090191110016]
- Fundamental Research Funds for the Central Universities [CDJXS10140005]
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The subcritical Organic Rankine Cycle (ORC) with 28 working fluids for waste heat recovery is discussed in this paper. The effects of the temperature of the waste heat, the critical temperature of working fluids and the pinch temperature difference in the evaporator on the optimal evaporation temperature (OET) of the ORC have been investigated. The second law efficiency of the system is regarded as the objective function and the evaporation temperature is optimized by using the quadratic approximations method. The results show that the OET will appear for the temperature ranges investigated when the critical temperatures of working fluids are lower than the waste heat temperatures by 18 +/- 5 K under the pinch temperature difference of 5 K in the evaporator. Additionally, the ORC always exhibits the OET when the pinch temperature difference in the evaporator is raised under the fixed waste heat temperature. The maximum second law efficiency will decrease with the increase of pinch temperature difference in the evaporator.
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