[AR] Re: helium tank submerged in LOX \ Re: Re: SpaceX failure update
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Tue, 8 Nov 2016 12:57:21 -0500 (EST)
On Mon, 7 Nov 2016, George William Herbert wrote:
Well, on the plus side, He is gas at O solid temps so you can cool with
a gas loop welded to the tank exterior, inside external insulation...
Unfortunately, cryogenic He is not a great heat-transfer fluid: very low
specific heat, very low density (unless you use quite high pressures). I
think it would be a challenge to get adequate cooling with a simple helium
loop. Cryo specific heats are generally lousy, which puts a premium on
density, and LN2 is roughly three orders of magnitude denser than helium
at LOX-ish temperatures.
Henry
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