Thermodynamic analysis of a novel solar based energy system in Tabriz

Document Type : Original Article


1 Department of Mechanical Engineering, Faculty of Engineering, Urmia University of Technology, Iran

2 Department of Mechanical Engineering, faculty of engineering, Urmia University, Urmia, Iran

3 Department of Business Management, National Iranian Oil Refining & Distribution Company, Tehran, Iran


A comprehensive energy and exergy analysis is reported of a novel solar thermal CHP system for three Operation modes. Energy and exergy analyses are used to characterize the exergy destruction rate in any ingredient and estimate solar thermal CHP cycle performance. The system comprising a solar loop heat pipe evaporator, an auxiliary pump, two ORC evaporators, two storage tanks, a storage pump, a storage heat exchanger, an ORC turbine, an electrical generator, a process heat exchanger, a regenerator, a domestic water preheater (ORC cycle condenser) and an ORC pump.
A computer simulation program using EES software is developed to model the solar thermal CHP system. The solar thermal CHP system simultaneously provides heating and electricity during the summer.
The analysis involves the specification of effects of varying ORC evaporator pinch point, varying ambient temperature and varying ORC turbine inlet pressure on the energetic and exergetic performance of the solar thermal CHP system for three operation modes. The performance parameters calculated are exergy destruction, energetic and exergetic efficiencies. The results showed that, for the solar and solar and storages operation modes, the main source of the exergy destruction is the solar loop heat pipe evaporator and the storage mode has maximum exergy efficiency and minimum exergy destruction rate.