CRYOGENIC ENGINE WITH ROTARY VALVE
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Apr 22, 2015
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Jul 26, 2012
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Abstract
A cryogenic refrigeration engine for producing refrigeration at temperatures below 200 K includes a reciprocating piston having a warm end and a cold end. A gas is admitted to the cold end of the piston at a first pressure and exhausted at a second pressure through a rotary valve. The second pressure is lower than the first pressure. The piston may be cup shaped and have a bottom and a cylindrical side wall. The bottom separates a space near room temperature and an expansion space below 200 K, and the side wall slides within a cylinder having a temperature gradient between room temperature and below 200K.
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