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Helium results!!! Window air con chill box build. - Page 4

post #31 of 118
6/27/12 at 1:16am
Thread Starter 
Thanks, It's a real Frankenstein monster of a build I know...lol... but my main concern is that it's effective.
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post #32 of 118
6/27/12 at 2:16pm
Thread Starter 
Taken a couple of more pics....finished the gaskets now..don't know if they show up so well in the pic though.

sam1151d.jpg

Uploaded with ImageShack.us

Also have finished the lid, have reinforced it with 18mm of mdf and run some banister rail along it, that overlaps the edge, the idea being that it will convert the tension in my ratchet straps into a closing downward force on the lid rather than just crushing the box.

sam1152a.jpg

Uploaded with ImageShack.us

I can't put any tension on them just yet as the adhesive is still drying.

I just could not resist doing a no load trial though.....well I say no load but with the bulb and fans it was probably about 50watts.

Air temp went down to -25 deg C, didn't seem to go down so fast as with my prototype box...perhaps its because the fans are now drawing through the evap rather than pushing through it? Or may be the fact that my contraction chamber was doing it's job and allowing air in slowed the cooling process.

Like I said I couldn't clamp the lid yet and just had some heavy books on it, but did notice some signs of leakage, from the lid near the fan stack, this led to condensation on the outside of the acrylic box in the region where the insulation box seals and also some on the top fan right by this area.......I'm hoping when I'm able to clamp it down properly that will be eliminated.
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post #33 of 118
6/28/12 at 12:02am
Thread Starter 
Well just did another no/low load test, this time with the lid strapped down tightly.....all good....so signs of cold escape on the outside box this time and down to -26 deg C.

One thing I'm noticing is that once the unit is turned off and is returning to normal temps, I'm developing condensation on the housing of the top fan.

What I'm thinking is happening is that as the air gradually warms the hotter air is rising to the top of the chamber where it is contacting colder surfaces and so causing condensation.

I think it's probably best to leave the fans circulating the air while it returns to normal temps to even out the temps?
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post #34 of 118
6/28/12 at 12:06am
This is such a bad @ss idea, great job man thumb.gif I bet it would be flat out awesome for overclocking biggrin.gif
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post #35 of 118
6/28/12 at 4:02am
Thread Starter 
I'm sure its not a leak, because of the way I have the expansion chamber inflated, if anything its operating at a very slight positive pressure.

Thinking its because of imbalance of internal humidity / temperatures, perhaps even being caused by the expansion chamber emptying a load of warmer air in as the chamber cools which may rise to the top fan?

Anyway I've put my desiccant in there now and given it a couple of cool/warm cycles to exchange air with the bag as well.....and its dry now.....dry as a nuns tush...lol biggrin.gif

The only places I'm getting signs of condensation is on the outside, where the power cables come out.....again I'm pretty sure this is not leakage because like I said I only have a very very slight positive pressure in there.

I think cold is conducting out through the metal cable cores and causing a little condensation when that cold hits the atmosphere, don't think its going to cause any problems though, besides there's little I can do about conduction.


Thanks Mitch.....I'm hoping the same about overclocking...... as soon as my dvi cable comes I'll beable to throw my rig in there and do some temp testing and oc'ing tests
Edited by technogiant - 6/28/12 at 6:16am
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post #36 of 118
6/28/12 at 12:30pm
Thread Starter 
I've been testing the unit for leaks, I've left the lid clamped on and I have slight positive pressure in there, not enough to stretch the bag but enough to open it out somewhat so just its own weight is trying to collapse it. If I were to take the lid off it would collapse in seconds so there is a small amount of positive pressure in there.

Took this picture of the bag 8 hours ago

sam1154w.jpg

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And this one just now......can't see any difference.....think the chamber is pretty air tight at the pressures I'll be using.

sam1157k.jpg

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post #37 of 118
6/28/12 at 1:06pm
Nice project, subbed. biggrin.gif
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post #38 of 118
6/28/12 at 1:53pm
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Cheers Matt, thumb.gif

Stay tuned, should be testing in next few day, just waiting on one delivery.
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post #39 of 118
6/28/12 at 10:21pm
just read through the entire thread and your build is amazing, much better than mine where i sucked in cold winter air and pumped out hot air, well done, can't wait for the test results.
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post #40 of 118
6/29/12 at 2:57am
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Thanks Kevin, you must be a determined guy to read through the entire post with all my drivel in there...lol.
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