Simulation and Parametric Investigation of Combined Parabolic Through Collector (PTC) and Organic Rankine Cycle (ORC

Development of innovative thermodynamic cycles is important for the efficient utilization of low-temperature heat sources such as solar، geothermal، and waste heat sources. Binary mixtures exhibit variable boiling temperatures during the boiling process، which leads to a good thermal match between the heating fluid and working fluid for efficient heat source utilization. This study presents a theoretical analysis of a combined power cycle، which combines the organic Rankine cycle and parabolic through collectors cycle، uses different organic fluid as the working fluid and produces power. This cycle، also known as the ORC، can be used as a downstream cycle using heat source from a solar radiations، and it can using low to mid-temperature sources with concentrator or not. A thermodynamic analysis of power was presented. The performance of the cycle for a range of turbine pressure، ambient temperature، condenser pressure، altitude، and different working fluids were studied to find out the sensitivities of gross power، net power، electrical efficiency، net electrical efficiencies and plant auxiliary، effective efficiency. The thermodynamic analysis covered a broad of boiler temperatures، 250 °C and pressure 20 Bar. The first law efficiencies of 11. 85 % are achievable at 250 °C and pressure 20 Bar with R-123 as working fluid. The cycle can reached to 19. 64 % net electrical efficiency with recuperate heat exchanger that works at 44 bar pressure 250 °C temperature and with R-141B as working fluid.