EXERGY ANALYSIS OF ORGANIC RANKINE CYCLE USING R245fa, HFE7000 AND HFE7100

Abstract

In the present work, the working fluids are in account have low global warming potential and zero ozone layer depletion potential. The fluid with low GWP and zero ODP are best suited fluids as they are environment friendly. The fluids considered are R245fa, HFE7000 and HFE 7100. After the selection of the fluids with merely equal critical point temperature so as to make comparison easy, the first order simulation has been done on various working fluids with different cycles that are saturated ORC, ORC with heat exchanger and ORC with feed water heater. In this a computer program is made on engineering equation solver (EES) to simulate the thermodynamic performance. Firstly the thermodynamic efficiency is calculated for various cycles with the different fluids. In this the expander temperature is varied, at fixed condensation temperature. Also , the efficiency of turbine and pump are assumed to be 0.80 and 0.60 respectively. Later the exergetic efficiency is also calculated for different cycles and compared for various fluids.