Energy and Exergy Analysis of Organic Rankine Cycle Using Alternative Working Fluids (original) (raw)

The present study is based on parametric investigation in terms of thermal efficiency, exergetic efficiency and exergy destruction with the help mathematical modeling on different ORC models using different fluids. The Thermal efficiency of ORC model of Saturated, Trilateral is compared by using working fluids such as (HFO-1234yf,HFC-134a,HFC-245fa,Ethanol,Iso-pentane by varying expander inlet temperature (30-160⁰C),at fixed condensation temperature(30⁰C) assuming fixed expander isentropic efficiency (=0.75) and fixed isentropic pump efficiency(=0.60). The Thermal efficiency as well as exergetic efficiency has been observed best for theHFO-1234yf and found nearly close with HFC-134a. HFO-1234yf has good potential for working fluid for ORC application for low to medium temperature. It has zero global warming potential (GWP), zero Ozone layer depletion (ODP) and very Low evaporation Temperature. This paper provides a basis to compare the thermal and exergetic efficiency for various working fluids and exergy destruction in various component such as Expander, Evaporator,Condenser,Pump for saturated and Trilateral cycle when used with R-1234yf as working substance.