EFFECT OF WORKING FLUID ON THERMODYNAMIC PERFORMANCE ANALYSIS OF ORGANIC RANKINE CYCLE (ORC)

Abstract

Working fluids play a crucial part in Organic Rankine Cycle (ORC) which is able to recover the low grade heat from renewable or waste heat sources. Current work focuses on establishing the relationship between ORC performance parameters (First law efficiency, Second law efficiency, Turbine Size Factor (TSF), network output) and the source temperature, Turbine inlet Temperature Pinch point Temperature Difference and turbine efficiency by employing 4 different working fluid (RC318, R600a, R32, R134a). The working fluids are so chosen that two are dry fluids (RC318, R600a) having higher critical temperature and two are wet fluids (R143a, R32) with comparatively lower critical temperature. An EES program has been developed to analyse these performance parameters with varied input conditions. The cycle efficiency increase monotonically with rising HST, TIT and turbine efficiency. On contrary TSF decreases with increasing HST, TIT and turbine efficiency.Net Work Output increases with increasing HST, TIT and Turbine Efficiency but decreases with increasing PPTD.