Thermodynamic analysis of a novel heat pipe based regenerative combined system

Document Type : Research Article

Authors

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

2 Mechanical Engineering Department, Faculty of Engineering, Urmia University, Urmia, Iran

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

Abstract

A comprehensive thermodynamic analysis is presented of a new solar system for heating and power generation. Energy and exergy analyses are used to characterize the exergy destruction rate in any component and investigate solar system performance. The system composed of a solar heat pipe evaporator (SHPE), an auxiliary pump, a condenser, a turbine, an electrical generator, a domestic water heater, a regenerator, a water preheater and a pump. The solar system provides heating and electricity during the summer and spring in Tabriz, Iran. The analysis involves the specification of effects of varying SHPE condenser pinch point temperature, varying solar radiation intensity and varying SHPE heat removal factor on the energetic and exergetic performance of the system. The performance parameters calculated are energy flow, exergy destruction rate, energetic and exergetic efficiencies. The results also showed that the main source of the exergy destruction rate is the SHPE. In the SHPE, 291.1 kW of the input exergy was destroyed. Other main sources of exergy destruction rate are the SHPE condenser, at 6.655kW; then the turbine, at 6.228 kW; and the water preheater, at 0.907 kW. The overall energetic and exergetic efficiencies of the combined solar system was approximately 69.57% and 12.41%, respectively.

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