Abstract
A Stirling/pulse tube hybrid cooler is comprised of a Stirling cooler as the first stage and a pulse tube cooler as the second stage. Such a cooler is able to shift cooling capacity between stages by adjusting the phase of the displacer. Therefore, this hybrid cooler can adapt itself to time-varying heat loads at different temperatures. In this paper, an idealized model of the hybrid cooler is introduced, which is followed by a qualitative analysis on the mechanism of the hybrid cooler’s ability of shifting cooling capacity between stages. It is found that such an ability of the hybrid cooler is conditional and the condition that enables this ability of the hybrid cooler is proposed. The analysis result is compared with numerical result from a Sage model and a good agreement is achieved. The understanding of the hybrid cooler’s mechanism of inter-stage cooling capacity shifting would be beneficial to its proper design and optimization.
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