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.
کلید واژگان :
Quantum heat engine; Irreversibility; Ecological function; Spin-1/2 system
