Cryocooler (4)-Fundamental Review of Cryogenic Refrigerators-

Abstract

Part IV of this study covers the additional explanations of Stirling coolers following the part III of the series. In the first section, the method for evaluating characteristics in the case of non-isothermal model is examined. The effect of imperfect heat transfer at the cylinder wall is discussed using an example calculation. In the second section, a linear driving method for the compressor piston and an expander piston are introduced. The concept of a gas spring constant is introduced. In the case of the mechanical spring supported displacer, the operating mode of the Stirling cooler and Stirling engine is discussed from the view point of the resonant frequency of the displacer.