THERMODYNAMIC ANALYSIS OF AN ATKINSON CYCLE UNDER EFFICIENT POWER DENSITY CONDITION

Thermodynamic analysis of an ideal air standard Atkinson cycle usnder Efficient Power Density is presented in this paper. Three past known criteria in the context of Finite time thermodynamics or Entropy Generation Minimization i.e Power, Power density & efficient power are re-casted in terms of Work Criteria Function which is relatively a new approach to analyze the performance & maximize the power output of any heat engines. The formulation of this concept gives rise to new performance criteria i.e Efficient power density(EPD) which is defined as the efficient power divided by maximum volume of working fluid & its maximum value gives Maximum Efficient Power Density(MEPD).This theory has been implemented to calculate the Power output & efficiency of an Atkinson cycle. Finally a comparative study of different criteria has been made to draw the inference & thus result is obtained. The result obtained from this analysis showed that engine designed at MEPD condition are more efficient than those designed at MP ,MPD & MEP conditions. This work has been carried out by incorporating relative air fuel ratio, fuel mass flow rate & residual fraction such that these parameters are the function of variable specific heat & it is observed that the efficiency increases with the increase of relative air fuel ratio & residual fraction. This result can be helpful in the thermodynamic modeling & design of practical Atkinson engine.