Experimental Investigations on 20 K Stirling-Type Two-Stage Pulse Tube Cryocooler with Inline Configuration
Tendolkar, M. V.
Narayankhedkar, K. G.
Atrey, M. D.
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Multistaging in a Stirling-type Pulse Tube Refrigerator (PTR) is employed to reach the temperature range of 20 K and below. Various configurations of two-stage PTRs can be used, where the former stage provides precooling for the next stage. There are several candidate twostage configurations, each with advantages and limitations. These include: inline, ‘U’ type, coaxial, and combinations of these. In addition to the above, the configuration can be of integral or split type, depending if the compressor is directly attached to the pulse tube assembly or is remote. The present work describes experimental investigations carried out on an integralconfiguration Stirling-type two-stage PTR with inline pulse tubes for both stages. This pulse tube configuration is thermodynamically advantageous as it involves the least dead space and flow resistance. Inertance tubes are used as the phase shift mechanism for both stages. The secondstage alone has an added double-inlet valve along with the inertance tube. A linear compressor is used to provide the PV power to the PTR and is maintained at 350 W. The investigations are carried out for different operating conditions.