The only reason for using Nitrogen is cause there's little moisture in it and well just cause. I mean I could probably use Co2 but at this point Nitrogen seems just as good. From my paintball Experience Co2 is hard to find pure with out going into to a research grade or spec gas. But I mean it’s totally possible to use Co2 but Nitrogen sounds cooler He he. Sorry not much of an answer there.
In terms of maintenance well, with a sealed environment no dust enters other than me opening the case up every month or so, and the vacuum pump will help keep the dust levels down. So basically there is not much maintenance.
After thinking more about it I might go with a Phase change cooling system and use R22, but I’ll have to do more research about it. The phase change cooling would replace the Coil of copper tubing with Peltier’s cooling the water. Any links or suggestion about that would be great, just reading the other forums seem to give good amount of detail about how it’s done so I’ll need to read for a while.
Now Skulemate was right about probably losing some cooling through the fact that my Cylinder is Clear acrylic ect. So there will be a loss there but I’m thinking that if I use Phase changes Refrigerator style I think I’ll get better results.
Oh and I’m surely expecting a ton of condensation on the outside of the cylinder, I may insulated the outside but for display reasons I’ll keep the insulation off. But it’s something I’ll keep in mind.
Now Bigben2K have I missed something about using the 3 to 5 psi pressure to maintain a positive pressure to keep regular air out? If So plz explain.
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