Abstract
A hermetic Stirling engine, which has a generator in a pressurized crankcase, is suitable for an application of a generator set. Because the hermetic engine does not have an external seal device between the working space and the atmosphere, and it has small mechanical loss. In this paper, the author reorganizes a 100 W class Stirling engine named "Ecoboy-SCM81" to the hermetic type. The original engine was developed at a RC127 committee of JSME in 1995,and it had a mechanical seal as the external seal device. And, the performance of the hermetic engine is measured for a comparison with that of the original engine. As the result, it is confirmed that the hermetic engine has very smaller mechanical loss and higher generator power than that of the original engine.
