Thermodynamic Analysis and Comparison of Two Novel Organic Rankine Systems based on Solar Loop Heat Pipe Evaporator

Document Type : Original Article


1 Department of Mechanical Engineering, Faculty of Engineering, Urmia University of Technology, P.O. Box 57155-419, Band Road, Urmia, Iran

2 Department of Mechanical Engineering, faculty of engineering, Urmia University, P.O. Box 165, 11km Sero Road, Urmia, Iran

3 Department of Business Management, National Iranian Oil Refining & Distribution Company, P.O. Box 15815/3499, 4 Varsho Street, Tehran, Iran


A comprehensive thermodynamic analysis and performance comparison of two solar ORC systems for electricity generation is reported. Energy and exergy analyses are used to characterize the exergy destruction rate in any component and estimate solar ORC systems performance. The systems considered are solar ORC system with single stage turbine and solar ORC system with double stage turbine. A computer simulation program using EES software is developed to model the solar ORC systems. The solar ORC systems provide electricity during the hours of solar radiation. The analysis involves the specification of effects of varying ORC evaporators pinch point, varying ambient temperature and varying ORC turbines inlet pressure on the energetic and exergetic performance of the solar ORC systems. This study shows that the solar ORC system with double stage turbine has the higher performance. The results also showed that the main source of the exergy destruction is the solar loop heat pipe evaporator for both considered systems. Other main sources of exergy destruction are the ORC turbines; and the ORC evaporators for both considered systems.