View Single Post
Old 07-08-2018, 04:09 AM
Dr. Strangelove's Avatar
Dr. Strangelove is offline
Join Date: Dec 2010
Posts: 7,957
Originally Posted by Chisquirrel View Post
Experiment run - it's workable, but not as efficient as I had hoped. There is a roughly 9 K drop running radiant pipe through every square of the nullifier. With a .48 J/(kgK) heat capacity, and 10 kg/s, that's roughly...43 W of cooling. You might have added a k in there, from the looks of things.
It's 0.48 kJ/(kg-J), or equivalently 0.48 J/(g-K). So definitely in the kW range. Hydrogen is 2.4 kJ/(kg-K).

Originally Posted by Chisquirrel View Post
I wonder how well it would work to just seal the nullifier in it's own room, put a gas vent on one side of the nullifier, a pump on the other, and let pressure differential cool the entire thing.
This is exactly what I've done. See here and here. The low-pressure input is the "filler". It takes in gas until it reaches steady-state. The high-pressure input does as you say--it completes the loop, while the gas pump pulls it from the other side. I get around 60 K of cooling with a flow rate of 0.5 kg/s.