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Helium results!!! Window air con chill box build. - Page 10

post #91 of 118
Thread Starter 
Thanks Stinger, some interesting ideas there.

As regards air ducting, the whole chamber is designed like a big air duct, the evaporator and fan stack seal to the lid when closed to make 2 chambers and the air is circulated through them in a circular fashion.

Atm the fans are sucking air through the evap, I may well reverse that and have it blow directly onto the mobo.......but with my current cpu heatsink that would cause opposite air flow so may wait till I change the heat sink.

I wanted to try direct conductive cooling via the cpu heat sink first, but again atm due to the current heat sink that's not possible, its low profile and too far away from the evap.
If I can use a taller heat pipe design that will bring it closer. I'm going to strap my temp probe to the evap see what direct contact evap temps are.

On the issue of cpu heat pipe coolers I've been thinking I may try adding peltier/tec cooling to the cpu.
This would have a 3 fold benefit, firstly it would add heat load to the heat pipes and help prevent freezing, perhaps in combo with a specific fan profile, secondly I'd obviously benefit from further improved cpu temps and thirdly it would add background heat load to the chamber to help prevent ac unit floodback.

I'm really trying to avoid adding a water loop if I can, it wasn't how I originally envisioned this and don't want the problems of possible leaks, low temps/alcohol attacking component etc and high price on upgrade for water blocks etc.....but I do need to solve the heat pipe problem and vapor chamber problem if that is one also, as that would give much more choice of cpu coolers and graphics cards....otherwise I'll have to got the water loop route.
Edited by technogiant - 7/9/12 at 1:39am
post #92 of 118
Thread Starter 
Idea toyed with......peltier ordered and enroute

peltierunit.jpg

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Also bought some copper flat bar to sandwich the peltier as it will overlap the cpu.

The peltier unit is rated at 228w on 15.2 v that equates to 180w on a 12v supply....think this will be enough for my q6600.....using a power supply calculator at my overclock it is meant to draw 200w...but I think the lower temp I'm using will mean there is less "leakage" in the silicon and so lower power usage....not used a pelt before...hope what I've bought is alright...perhaps I should have waited for a reply....I'm an impetuous child..lol
Edited by technogiant - 7/9/12 at 11:00am
post #93 of 118
Thank you, answered a lot of the uncertainties I had. Might of missed it but what size AC unit are you using, your –25c +/- chamber temp under load is right where I wanted to be on my own project. A lot better than a slush box concept I’ve been toying with.
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post #94 of 118
Thread Starter 
Quote:
Originally Posted by Aleslammer View Post

Thank you, answered a lot of the uncertainties I had. Might of missed it but what size AC unit are you using, your –25c +/- chamber temp under load is right where I wanted to be on my own project. A lot better than a slush box concept I’ve been toying with.

I'm using a 12000btu cooling unit.....holds my system under full load which is about 500w at -22c.
post #95 of 118
Amazing results there on the Q6600 and sli 460's TG! I'm sure you'll blow by 4Ghz soon!
Btw... excellent load capacity for an off the shelf window a/c.

The pressure drop inside the heat pipe won't matter, the freezing point will still be at or near 0c. Would be nice if you could change the working fluid.. unfortunately that's not an easy process and could very well end up losing capacity.

Great idea's there LtStinger. I'd be concerned about using software to control the hs fan on the tec though. If the pc hangs or crashes it could be the end of the cpu or worse. Best to use a separate control for that, preferably a dual or triple stage digital t-stat with thermocouple probes.

Not sure about that 228w tec providing 180w at 12v, might actually be more like 150w or less. Can you disable cores if needed for testing?

You can put the floodback worries to rest with a simple test run. Run the chillbox down to max low end temp. A rotary compressor will bounce or shake around.. might even hear a popping sound. That a/c has a large accumulator and also two dips in the suction line to trap and meter off liquid. I really don't see it being an issue unless you plan to cycle the unit at -20c or something.. which of course your not. Best to test it out though.
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post #96 of 118
Thread Starter 
Thanks Drew, I'm pleased with how the overclocking is going. Having said that even at almost 4GHz I think my cpu is bottlenecking my gpus....so it will be time to upgrade shortly.

I'm hoping the pelt I've got is powerful enough, the lower cpu temps should reduce "leakage" in the silicon and so reduce power usage/heat production, so the pelt may be powerful enough....will have to test.
I can't disable cores in my bios but I can test at defaults clocks and voltages and go from there, the Q6600 had a default tdp of 100w so the pelt should at least be up to that. I'll start at default clocks with my solid heat sink with fans set to 100% in bios, and work up from there.

The next more powerful pelt I could find was 400w which I thought overkill and would add too much heat load to the chamber and heat sink, I was trying to achieve a balance between the two.
Edited by technogiant - 7/14/12 at 5:53am
post #97 of 118
Just read through..Me Likey! thumbsupsmiley.png
Note:you want to keep capacitors warm..as they cool..they lose resistance..letting more juice through to your cpu than you may want..
I've read about it..and experienced it redface.gif
 
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post #98 of 118
Thread Starter 
Uhmm...that's interesting...my mobo has 100% solid capacitors rather than electrolytic...does that make a difference?
post #99 of 118
solid is better..idk where I read through that stuff..Someone tested a bunch of caps by freezing them.
 
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post #100 of 118
You will not be able to reduce overall power consumption by adding a Peltier - just an FYI.
 
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