Maximizing Efficient Power for an Irreversible Porous Medium Cycle with Nonlinear Variation of Working Fluid’s Specific Heat

Considering the specific heat characteristics of working fluid and existence various losses in a porous medium (PM) cycle, this paper applies finite time thermodynamic theory to study its efficient power performance with nonlinear variable model. Range cycle pre-expansion ratio is obtained by solving equation, PM converted Otto choosing appropriate ratio. Influences ratio, characteristics, temperature on performances are investigated. Thermal efficiencies compared at operating points maximum output power. The results show that has better than cycle. Under certain conditions parameters, thermal 50.45% 47.05%, respectively, former 7.22% higher latter. engine designed as criterion can improve efficiency losing less output. guide parameters selection actual engine.