THERMODYNAMIC ANALYSIS OF THE ORGANIC RANKINE CYCLE AND THE EFFECT OF REFRIGERANT SELECTION ON CYCLE PERFORMANCE

Year 2017, Volume: 4 Issue: 3, 101 - 108, 25.10.2017

Omer Kaynakli Ali Husnu Bademlioglu Nurettin Yamankaradeniz Recep Yamankaradeniz

Abstract

The
Organic Rankine cycle is a power-generation system for lower temperature ranges
in which organic fluids with hydrocarbon components are used instead of water.
Organic Rankine Cycles, which are suitable for heat recovery applications at
low temperatures, can be used for generating electric energy from various waste
heat sources. In this study, a thermodynamic analysis is conducted on an
example Organic Rankine Cycle that is used to generate electric energy from a geothermal
source. The working fluid to be used in the cycle was selected as R134a,
R236fa, R245fa and R600a, which are commonly used. For these selected organic
fluids, the required cycle performance to generate 1 MW of energy from the
turbine was analyzed according to the geothermal source temperature (90-140°C),
and the thermal efficiency of the cycle was calculated. The obtained results
are presented comparatively with the help of the graphs. R245fa was defined to
be more appropriate for the cycle as a refrigerant at constant work conditions. 

Keywords

Organic Rankine Cycle, refrigerant, thermodynamic analysis, cycle performance, thermal efficiency

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