Date

1973

Document Type

Thesis

Degree

Master of Science

Department

Mechanical Engineering

First Adviser

Stenning, Alan Hugh

Abstract

A cryogenic refrigerator using an expander with a reciprocating displacer or piston which has a thermal gradient from one end to the other suffers a loss of refrigeration due to heat transfer between the displacer/piston and the cylinder (shuttle heat transfer). This loss can be eliminated by designing an annular thermal regenerator on the outside diameter of the displacer/piston in such a manner as to match the temperature profile of the displacer/piston and the cylinder wall throughout the cycle.

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