Question about pressures

[MIN_Roadkill]

I am making an airtight motherboard box for my computer so I won't have to full with insulating. I actually think it would be easier to insulate 100 cpu's rather than build this thing, but I have came too far now. So here is the question...

Should I fill it with nitrogen or leave it in vaccum? I have a shrader on it so filling it with nitrogen or pulling a vaccum would both be very easy.
If I fill it with nitrogen then how many psi would be reccomended? I have a guage built into the box so that I can monitor pressures and I have tested it up to 5 psi.
I have a thread over in the water chiller section but haven't got any pics up yet of the air tight box, but I will have some up in a few days. I made it from stainless steel(unsure of guage. It is around 1/32inch) and have a 1/4 inch plexiglass top. I can tell you now, stainless is a nightmare to work with. If you try brazing to it, it cracks and drilling through it is almost impossible with hand held tools. It is very strong though and will look very good once I get the welds grinded down and polish it out.

[saratoga]

If you pull a vacuum the system will overheat almost immediately since they'll be no cooling on the inductors, mosfets, etc all over the board.

[wdrzal]

also there needs to be a large enough extra surface area of the evap and suction line to asorb the heat put off by the smaller chips or the heat will rise inside the case.

[MIN_Roadkill]

Thanks for the replies, I just wanted to get some advice on this before I went any further. I guess I will continue with the original plan of 2 psi of nitrogen. I am hoping that my coolant lines will keep it cool enough inside the case, time will tell. If that doesn't work then I will add a radiator inside of the box.

[saratoga]

I have a thread over in the water chiller section but haven't got any pics up yet of the air tight box, but I will have some up in a few days. I made it from stainless steel(unsure of guage. It is around 1/32inch) and have a 1/4 inch plexiglass top. I can tell you now, stainless is a nightmare to work with. If you try brazing to it, it cracks and drilling through it is almost impossible with hand held tools. It is very strong though and will look very good once I get the welds grinded down and polish it out.

This sounds amazing. Hope you get those pics soon.

[jinu117]

What kind of compressor are you using? Hope PSU isn't in there. 20-30% of system is produced by PSU alone. Kill-a-watt shows my overclocked system consumes anywhere from 150-260w. So in essence, your system should be able to handle up to 260w to keep things in balance.... (Man... I wonder how the highside of pressure is going to be like)

[MIN_Roadkill]

What kind of compressor are you using? Hope PSU isn't in there. 20-30% of system is produced by PSU alone. Kill-a-watt shows my overclocked system consumes anywhere from 150-260w. So in essence, your system should be able to handle up to 260w to keep things in balance.... (Man... I wonder how the highside of pressure is going to be like)

I have a 1/3hp compressor right now, but I am looking for a 1hp to replace it.
The psu will be outside of the airtight enclosure.

[hatemi]

Build a small AC in the box. All you realy need to do is get a fridge compressor and some small condenser as an evap. Even a small fridge compressor should be able to keep the air in the box cool enough to cool the chipset and other heatsources with their regular fans.

[jinu117]

I have a 1/3hp compressor right now, but I am looking for a 1hp to replace it.
The psu will be outside of the airtight enclosure.

That sounds good. Even in worst case of being PSU 80% efficient (for heat output calculation on other components), that gives you only 220 watt or so of things to cool for. I am guessing HDD, CD/DVD rom, etc will be out of case too which will probably narrow things down to about 210 watt :P