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Publication Title | Thermodynamic Performance Analysis of Different Organic Rankine Cycles to Generate Power from Renewable Energy Resources

Organic Rankine Cycle

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American Journal of Renewable and Sustainable Energy

Vol. 1, No. 2, 2015, pp. 31-38 http://www.aiscience.org/journal/ajrse

Thermodynamic Performance Analysis of Different Organic Rankine Cycles to Generate Power from Renewable Energy Resources

Abtin Ataei1, 2, *, Farid Safari1, Jun-Ki Choi2

1Department of Energy Engineering, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran

2Mechanical and Aerospace Engineering / Renewable and Clean Energy, University of Dayton, Dayton, Ohio, USA

Abstract

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.

Keywords

Exergy Destruction, Regeneration, Heat Exchanger, Sustainability Index

Received: June 8, 2015 / Accepted: June 18, 2015 / Published online: July 8, 2015

@ 2015 The Authors. Published by American Institute of Science. This Open Access article is under the CC BY-NC license.

http://creativecommons.org/licenses/by-nc/4.0/

1. Introduction

Renewable energy is one of the key options for approaching energy security and sustainable development in modern era. These kinds of energy resources such as solar, biomass, wind, geothermal and tidal energy have a great potential for generating power and because of their reliability and availability, researchers paid lots of attention to them, in the last decades. One of them is geothermal energy that is always available and comes from earth's crust. The Major world's geothermal energy applications are a 12GW electricity production and a direct use for heating of 23 GW in 2013 [1].

* Corresponding author

E-mail address: a.ataei@srbiau.ac.ir (A. Ataei)

Organic Rankine cycles are promising technologies for development and conversion of low and medium grade heat resources into power. For three decades many researchers have worked on this subject and have used scientific fundamentals for more efficient and suitable conversion of these kinds of energy resources into power in power plants.

ORCs work with Traditional Clausius-Rankine principles but use organic dry fluids instead of water [2]. That makes them able to generate power and remain superheat after expansion in turbine in low and medium temperatures. The process of making electricity from renewable energy resource should be

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