Effect of Operating Parameters on Step Piston Type Pulse Tube Refrigerator

Abstract The pulse tube refrigerator without moving components at low temperatures has been used in wide application. The step piston type pulse tube refrigerator (SP-PTR) is a novel work recovery type pulse tube refrigerator which only requires one moving part and one cold head to achieve the work recovery function. In this paper, the influence of operating parameters on the refrigeration performance of SP-PTR is studied. There exists an optimal operating parameter that maximizes the efficiency. In the test range, the input voltage mainly affects the cooling power of the pulse tube cold head, while the frequency and operating pressure affect both the coupling between the step piston linear compressor and the pulse tube cold head.