Impedance match for Stirling type cryocoolers

Impedance match in Stirling type cryocoolers is important for the compressor efficiency and available acoustic power. This paper generalizes the basic principles concerning the efficiency and acoustic power output of the linear compressor. Starting from basic governing equations and mainly from the viewpoint of energy balance, the physical mechanisms behind the principles are clearly shown. Specially, this paper focuses on the impedance match for an existing compressor, where the current limit and displacement limit should also be taken into consideration when selecting a suitable impedance. Some case studies based on a commercial compressor are also provided for a deep understanding.

Research highlights► We generalizes principles concerning efficiency and power output of linear compressors. ► The physical mechanisms behind the principles are clearly shown. ► We focus on the impedance match for a compressor with current and displacement limits. ► Case studies based on a commercial compressor are provided for a deep understanding.