The present study focuses on the development and performance analysis of a three-stage beta-type Stirling cryocooler. The objective is to expand a single-stage cryocooler into three-stage and analyze the effect of such expansion into multi-stage with a performance comparison of the two cryocoolers. A thermodynamic model is developed and validated with experimental results. The numerical model is useful for examining the effect of relevant parameters of the cryocooler and could be utilized for further development of multi stage cryocoolers. The cryocooler achieved a no-load temperature of 90.0 K at rotation speed of 700 rpm and a charge pressure of 2 bar. With a heat load applied on the third stage only, the cryocooler reached a temperature of 116.6 K, with a cooling capacity of 1 W, yielding a relative COP of 0.52 % at 2 bar, 600 rpm.

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