داود جان بيگلر

The world is currently facing an energy crisis driven by the rising demand for non-renewable fuels and unprecedented global energy consumption. Simultaneously, significant amounts of low-temperature waste heat are produced across various industrial processes. This waste heat is typically released directly into the atmosphere, contributing to thermal stress, environmental pollution, and global warming. One effective method for recovering industrial waste heat is through the Organic Rankine Cycle (ORC), which utilizes organic fluids—such as refrigerants and hydrocarbons—with higher molecular weights and lower boiling points than water. This study presents a comprehensive energy and exergy analysis of Organic Rankine Cycles under six different configurations, employing dual-component refrigerant mixtures for waste heat recovery in combined cycle systems. Comparisons were conducted based on thermal efficiency, energy and exergy efficiencies, and net power output. The optimal mass fraction compositions for the refrigerant mixtures were determined for each case. To ensure a consistent basis for comparison, it was assumed that the refrigerant’s inlet and outlet temperatures, as well as mass flow rates, remained constant across all scenarios. Two dual-component mixtures, hexane–pentane and isopentane–isohexane, were selected for eva‎luation. The results demonstrate that incorporating both an internal heat exchanger and a regenerator significantly enhances the energy and exergy efficiencies of the ORC. Furthermore, the use of dual-component mixtures as working fluids yields better performance, improving efficiency and reducing exergy losses compared to single-component fluids. The most promising result was achieved with a dual mixture containing 40% isopentane and 60% isohexane by mass fraction, combined with the fourth configuration, resulting in a 1.56% increase in the overall efficiency of the combined cycle system and the Organic Rankine Cycle.

سيكل آلي رانكين , بازيافت حرارتي , بازدهي انرژي , تحليل اگزرژي

Organic Rankine Cycle (ORC) , waste heat recovery , Energy Efficiency , exergy Analysis

Janbiglar

Dr.Ahmadi