Performance investigate of trilateral, subcritical and supercritical organic rankine cycle driven by geothermal heat source

Abstract

This study investigates three different types of power plant include a trilateral cycle (TLC), subcritical organic Rankine cycle (ORC), and supercritical ORC power plant driven by geothermal heat source with mass flow rate 1 kg/s and temperature of 100๐C, 110๐C and 120๐C. with 27 substances were examined as the working fluid of the power plant. While the net power output of 4.78 kW and 7.74 kW is obtained from the subcritical ORC with RC318 as its working fluid when the heat source temperature are at 100๐C and 110๐C, respectively. Meanwhile, the net power output of 11.85 kW is obtained from the subcritical ORC with R227ea as its working fluid when the heat source temperature is at 120๐C. The net power output of 5.64 kW and 9.16 kW are obtained from the supercritical ORC with R218 as its working fluid when the heat source temperature are at 100๐C and 110๐C, respectively. Meanwhile, the net power output of 12.88 kW is obtained from the supercritical ORC with R143a as its working fluid when the heat source temperature is at 120๐C. Furthermore, the net power output of 7.96 kW, 12.27 kW, and 17.38 kW are obtained from the TLC plant with heptane as its working fluid when the heat source temperature are at 100๐C, 110๐C, and 120๐C, respectively.