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Subject: Re: Sorption Pumps/LN2 & Pump mods
Date: Jan 19, 3:44 pm
Poster: Stephen

On Jan 19, 3:44 pm, Stephen wrote:

I live in a small/medium sized city where the local industrial base doesn't have much use for LN2. By asking around I found out that one company does use it, it's ordered by the distributor exclusively for them and they only take what they need often leaving a small quantity (more than I need) to boil away. By showing up with my own bottle at the right time I can often get usable quantities for free.

Also, by using smaller diameters of copper tube and ganging them in groups of four for a single pump you can get the same effect of having heat transfer fins inside the pumps.