The ratio of swept volume of the compression space to the swept volume of the expansion space is an important design parameter for the Stirling cryogenerator. The swept volume ratio can be varied by changing diameter either of the piston, displacer or both of them. In this paper cyclic simulation of Stirling cycle has been carried out to predict the performance of a Stirling cryogenerator for varying swept volume ratios. The dimensions of other components like cooler, regenerator and condenser are kept constant. For a given diameter of the displacer, piston diameter has been optimized based on COP. Also, an attempt has been made to find the optimum combination of piston and displacer diameters for optimum COP of the cryogenerator. The results can be extended to find out the best combination of the piston and the displacer diameters for a given refrigerating load.
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