Low emissivity liquid nitrogen dewar

Details Low emissivity liquid nitrogen dewar Low emissivity liquid nitrogen dewar

F - Mech Eng,Light,Heat,Weapons

17

C

113/33, 190/42

F17C 3/08 (2006.01) C23G 1/12 (2006.01)

Patent

CA 1116107

PATENT APPLICATION of GEORGE D. KNEIP, JR., GEORGE CHMYZ and MARVIN H. ANDERSON for LOW EMISSIVITY LIQUID NITROGEN DEWAR FOR CRYOGENIC LIQUIDS Abstract of the Disclosure A Dewar for liquified gases includes a spun can for the liquified gas, which spun can is surrounded by an exterior shell. Between the exterior shell and the can is an evacuated space containing a second shell that functions as a radiation shield. The can and both shells are formed of an aluminum alloy havng a very high percentage of aluminum. The exterior can surface, interior surface of the exterior shell, and both surfaces of the second shell have clean, non-pitted, smooth, matted, smut free and etched appearances free from discoloration and stains so that these surfaces have low radiation emissivity properties and there is a minimum amount of radiant energy transmitted from the exterior shell to the can and reduced heating of the liquid nitrogen in the can. Each of the surfaces is initially polished, either mechanically, electrochemically or chemically, and then chemically treated with an etchant of nitric acid and hydro- fluoric acid for a sufficient duration to achieve the desired appearance.

321939

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