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Colder LN2 1

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kairchuan

kairchuan

Aerospace
Joined
Jan 23, 2003
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Does anyone in the community know of any process to make LN2 colder ?
i.e lower the freezing point of LN2.

Steve Lim
 
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Doesn't putting a vuccum on the tank lower it's freezing point. I know we have done this to increase boil-off times.
 
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As mentioned in the previous post, vacuum pumping on the dewar essentially causes a Joule-Thomson cooling of the LN2 in the dewar. You can get about 10°C to 15°C additional cooling, e.g., operating temps down around 60 K.

Anything lower requires using something other that LN2. Depending on the heat load, a split-Stirling helium cryocooler for infrared imagers can get down to 50 K or so with no circuit load. TTFN
 
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