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Erschienen in:
1986 | OriginalPaper | Buchkapitel
An Experimental Study Simulating the Helium Liquefaction Process in a Reciprocating Magnetic Refrigerator
verfasst von : Toyomi Fujita, Takashi Yazawa, Takasu Hashimoto, Hideki Nakagome, Toru Kuriyama
Erschienen in: Advances in Cryogenic Engineering
Verlag: Springer US
Enthalten in: Professional Book Archive
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We have constructed a special one-shot test apparatus to investigate the properties of a reciprocating magnetic refrigerator for helium liquefaction. The liquefaction efficiency for one-shot demagnetization was only about 40% with an initial temperature of 5 K, and higher initial temperatures gave lower liquefaction efficiencies. Losses in the experiment can be classified into four causes: the thermal resistance of the film condensation heat transfer, friction, the heat flow from the holders to the refrigerant and cooling of gaseous helium above 4.2 K to 4.2 K. The last cause was the most dominant.