The temperature ・ entropy diagram fbr α 一 type Stirling Engilles is obtained on the basis of the adiabatic model ofFinkelstein ( 1962 ) . With his model the thermedynamic processes in practical engines can be analyzed , and the relationship between the pressure and volume of the working gas may be obtained . Then , using the pressure thus obtained , beth the relationship betweeII the mixing − cup temperature and tmixing − cup entrop ゾ, and the diagram of temperature ・ entropy are obtained based on the method proposed by Oyama ( 2000 ) . By comparing it with the cycle fbr the isothermal model , the characteristics ofthe cycle f ( )r the adiabatic model are clarified. It is f ( )und that , when the dead volume and temperature ratios are small , the traces of the cycle of the adiabatic model resembles the Arabic 丘 gure 8 , which means that the cycle has both the characteristics of a heat engine and a ref 士igerator . The optimum heat storage of regenerators is also Qbtained which realizes the Carnet efficiency under
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