Thermodynamic Analysis of ORC and Its Application for Waste Heat Recovery

Alireza Javanshir, Nenad Sarunac and Zahra Razzaghpanah
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Alireza Javanshir: Faculty of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, NC 28223, USA
Nenad Sarunac: Faculty of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, NC 28223, USA
Zahra Razzaghpanah: Faculty of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, NC 28223, USA

Sustainability, 2017, vol. 9, issue 11, 1-26

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 CO 2 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.

Keywords: organic Rankine cycle; working fluid properties; thermal efficiency; subcritical ORC; transcritical ORC; combined Brayton ORC cycle; techno-economic analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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