Ultimate Temperature of Pulse Tube Cryocoolers

Abstract

An ideal pulse tube cryocooler using an ideal gas can operate at any temperature. This is not true for real gasses. The enthalpy flow resulting from the real gas effects of 3 He, 4 He, and their mixtures in ideal pulse tube cryocoolers puts limits on the operating temperature of pulse tube cryocoolers. The discussion of these effects follows a previous description of the real gas effects in ideal pulse tube cryocoolers and makes use of models of the thermophysical properties of 3 He and 4 He. Published data is used to extend the analysis to mixtures of 3 He and 4 He.The analysis was done for pressures below 2 MPa and temperatures below 2.5 K. Both gasses and their mixtures show low temperature limits for pulse tube cryocoolers. These limits are in the 0.5-2.2 K range and depend on pressure and mixture. In some circumstances, even lower temperatures may be possible. Pulse tube cryocoolers using the two-fluid properties of dilute 3 He in superfluid 4 He appear to have no limit.

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

“…Some basic information about the PTC theory can be found in several Refs. [23,25,[28][29][30][31][32].…”