The new numerical thermal model based on polytropic expansion/compression processes was developed for predicting thermal performance of Stirling engines. In this regard, differential governing equations of early adiabatic model of Stirling engines were modified to consider polytropic heat...

A new thermal model called Simple-II was presented based on modification of the original Simple analysis. First, the engine was modeled considering adiabatic expansion and compression spaces, in which effect of gas leakage from cylinder to buffer space and shuttle effect of displacer were...