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Sustainability 2017, 9(11), 1974; doi:10.3390/su9111974

Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery

Faculty of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, NC 28223, USA
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Received: 6 October 2017 / Revised: 23 October 2017 / Accepted: 25 October 2017 / Published: 29 October 2017
(This article belongs to the Special Issue Sustainable Utilization of Waste Heat)
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Abstract

The analysis and optimization of an organic Rankine cycle (ORC) used as a bottoming cycle in the Brayton/ORC and steam Rankine/ORC combined cycle configurations is the main focus of this study. The results show that CO2 and air are the best working fluids for the topping (Brayton) cycle. Depending on the exhaust temperature of the topping cycle, Iso-butane, R11 and ethanol are the preferred working fluids for the bottoming (ORC) cycle, resulting in the highest efficiency of the combined cycle. Results of the techno-economic study show that combined Brayton/ORC cycle has significantly lower total capital investment and levelized cost of electricity (LCOE) compared to the regenerative Brayton cycle. An analysis of a combined steam Rankine/ORC cycle was performed to determine the increase in power output that would be achieved by adding a bottoming ORC to the utility-scale steam Rankine cycle, and determine the effect of ambient conditions (heat sink temperature) on power increase. For the selected power plant location, the large difference between the winter and summer temperatures has a considerable effect on the ORC power output, which varies by more than 60% from winter to summer. View Full-Text
Keywords: organic Rankine cycle; working fluid properties; thermal efficiency; subcritical ORC; transcritical ORC; combined Brayton ORC cycle; techno-economic analysis organic Rankine cycle; working fluid properties; thermal efficiency; subcritical ORC; transcritical ORC; combined Brayton ORC cycle; techno-economic analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Javanshir, A.; Sarunac, N.; Razzaghpanah, Z. Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery. Sustainability 2017, 9, 1974.

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