Performance Analysis of ORC with Environment-Friendly Working Fluids Novec 649 and R1233zd[E] as Alternative to R245fa

Abstract

In the present work, two low GWP fluids, viz. Novec 649 and HFO1233zd[E], have been considered to replace R245fa in ORC with and without IHE. A computational model is developed in EES software for the evaluation of cycles. The cycles are studied on the basis of the first law of thermodynamics, and exergy analysis is also carried out. The results substantiate that the first law efficiency of Novec 649 is lower than R245fa, whereas R1233zd[E] shows better first law efficiency than R245fa. The first law efficiency increases with increase in evaporator temperature, whereas it decreases with increase in condenser temperature. The usage of IHE improves the first law efficiency. The exergetic efficiency for R1233zd[E] is higher than other fluids in comparison with R245fa and Novec 649. The effect of degree of superheat in both cycles on exergetic efficiency is to decrease it.