2401 Improved Performance of a Stirling Cooler due to a Jet Induced by the Displacer Motion
Details
A compact-sized and high performance free-piston Stirling cooler, whose piston is directly driven by a linear motor, has been developed: the plastic displacer, stuffer, and regenerator enhance thermal insulation and the copper heat exchangers improve heat exchange performance. We studied a jet effect on the FPSC cooling efficiency by using the original displacer equipped with a jet mechanism: there is an inlet valve at the compression space side of the displacer and are jet orifices at the expansion space side, thereby a working gas is injected into the displacer at a compression process and jetted out from it at an expansion one. This new mechanism improved the COP and its dependence on a jet orifice location and/or the number of jet orifices were investigated. Their optimization is also discussed in this paper.
