American Journal of Renewable and Sustainable Energy
Articles Information
American Journal of Renewable and Sustainable Energy, Vol.1, No.2, Jul. 2015, Pub. Date: Jul. 10, 2015
Thermodynamic Performance Analysis of Different Organic Rankine Cycles to Generate Power from Renewable Energy Resources
Pages: 31-38 Views: 3986 Downloads: 2142
[01] Abtin Ataei, Department of Energy Engineering, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran; Mechanical and Aerospace Engineering / Renewable and Clean Energy, University of Dayton, Dayton, Ohio, USA.
[02] Farid Safari, Department of Energy Engineering, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran.
[03] Jun-Ki Choi, Mechanical and Aerospace Engineering / Renewable and Clean Energy, University of Dayton, Dayton, Ohio, USA.
Organic Rankine cycles (ORCs), are promising technologies for generating power from low and medium grade of heat resources such as geothermal fluids or the synthetic gas from biomass gasification, that have received lots of attention during past twenty years. In this study, thermodynamic evaluations were used based on the first and second laws of thermodynamics to compare different organic fluids and different configuration of Rankine cycles. Energy and Exergy analysis of different configurations of ORCs including basic ORC, basic ORC with Internal Heat Exchanger (IHE), Regenerative ORC and Regenerative ORC with IHE for four dry organic fluids including R113, RC318, iso-pentane and n-hexane, in various ambient temperatures, were simulated using Engineering Equation Solver (EES). In addition, environmental performances were evaluated using the sustainability index method which was resulted from Exergy analysis. The results indicated that the Regenerative ORC with IHE has the best thermodynamic performance with thermal and second law efficiency of 0.217 and 0.642, respectively. It was concluded that the n-hexane which has the highest boiling point and critical temperature is the most efficient working fluid for the cycle. The results indicated that a reduction in ambient temperature causes an increment in both thermal and second law efficiencies and makes the system more sustainable due to an increment in the sustainability index.
Exergy Destruction, Regeneration, Heat Exchanger, Sustainability Index
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