Exergoeconomic analysis of zeotropic mixture on the new proposed organic Rankine cycle for energy production from geothermal resources

摘要

In this study, the performance of Isobutane/Isopentane (zeotropic mixture) is studied in the new proposed Organic Rankine Cycle (NORC). Operating parameters included temperatures of two series evaporators and regenerative, degree of superheating, and pinch point temperature difference in the first evaporator are optimized with multi-objective functions i.e., exergy as thermodynamic, Specific Investment Cost (SIC) as economic and exergoeconomic as the third objective function that considered exergy and SIC simultaneously. Optimization results for Isobutane/Isopentane indicate that the value of exergy has a sharp decrease when the mole fraction of Isobutane increases to 0.5, and after that, the exergy amount rises significantly and reaches a peak at 54.584% for pure Isobutane. Also, return on investment (ROI) is employed as an economic indicator to get the center of attention in economic proficiency by utilizing Isobutane/Isopentane in NORC configuration according to the exergoeconomic results for fifteen countries as two groups of developed and developing in order to compare profitability all around the world. The results represent that, by the growing of Isobutane mole fraction in Isobutane- Isopentane mixture, ROI indicator is reduced. The maximum and the minimum value of ROI are related to Germany (57.64%) and India (4.09%), respectively. (C) 2020 Elsevier Ltd. All rights reserved.