Performance analysis and ecological optimization of an irreversible quantum heat engine with spin-1/2 system

This paper is about an irreversible quantum spin-1/2 heat engine. Performance of the irreversible quantum heat engine including basic thermodynamic parameters, power output and energy efficiency, are considered, besides ecological function. Ecological function gives a possibility a comparison between power output and exergy destruction. The results show that power output and ecological function have maximum (optimum) points for different effectiveness values which are 0.9 and 0.8 and according to different magnetic field values . All parameters are compared with each other and it is found that the most convenient operation conditions are obtained at optimum ecological function.