Thermodynamic Analysis of an Integrated Organic Rankine Cycle (ORC) and Vapor Compression Cycle (VCC) with Internal Heat Exchangers using Next-Generation Working Fluids

In this research, a thermodynamic analysis of a combined organic rankine cycle-vapor compression cycle (ORC-VCC) with low global warming potential working fluids is carried out. The ORC turbine power output varies between 1.795-1.962 kW, with thermal efficiency and exergy efficiency ranging between 0.1008-0.1093 and 0.4347-0.4716, respectively, showing a 8.5% relative improvement. In the refrigeration system, the VCC COP increases from 4.95 to 5.303, with a relative improvement in exergy efficiency of 7.1% from 0.2622 to 0.2809. The overall system COP increases from 0.4989 to 0.5799 with a 16.2% relative improvement in overall total exergy efficiency of 0.1140 to 0.1325. Parametric results show that higher turbine inlet temperatures improve both COP and exergy efficiency, while increased condenser temperatures reduce them. Amongst different fluid pairs investigated, R1233zd(e)/ R1336mzz(Z) shows best thermodynamic performance.