Thermodynamic and Exergoeconomic modeling of a modified Organic Rankine Cycle (ORC) augmented with heat exchanger Provided by geothermal source

In the present study, the effect of a heat exchanger on the performance of Combined Rankin Organic Cycle (ORC) and geothermal was investigated. The hot water r coming out of the ground enters a liquid-vapor separator. The generated steam enters the steam turbine section and the liquid section enters a heat exchanger to superheat the refrigerant and rotate the ORC turbine Energy, exergy and exerco-economic modeling was performed using EES software and SPECO method in a wide range of different working fluids. The results showed that the output power of the system has a maximum point in terms of separator pressure for a simple cycle, but increases ascending for the modified cycle without limitation. In terms of energy analysis, modified cycle with heat exchanger compared to the simple cycle, R237ea and n-Pentane have the highest amounts of increasing at the efficiency and power generation are maximum with 45.4 and 40%, respectively. In terms of power generation cost savings, R237ea and R123 with 0.63 and 0.55 (cent / kW-hr), respectively. Cis-2-butene with 6376 kW in terms of power generation and R237ea in terms of cost savings in power generation are the best refrigerants.