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Description
Recovering the acoustic power from the Stirling-type pulse tube cryocooler is of great utility in improving cooling efficiency. In this paper, a two-stage cascade pulse tube cryocooler capable of power recovery is introduced and tested. A displacer, playing a role of phase modification and power transmission, is connected between a primary cooler and a secondary cooler. Experimental investigation was first conducted on the cooling performance of the overall system and the separated coolers. The pressure ratios and pressure waves at two sides of the displacer were then studied. The experimental results showed that displacer not only tuned the pressure wave phase but also amplified the pressure wave amplitude. To better understand the displacer, its mechanical resistance and displacement were further discussed. In addition, the power consumption ratio of the 1st cooler, the 2nd cooler and the displacer were presented. The experimental system achieved a total an exergy efficiency of 37.2 % and total cooling capacity of 371 W at 130 K.
