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aircon phase cooling?

post #1 of 4
10/4/12 at 4:48pm
Thread Starter 
im a refrigeration and aircon engineer. i have access to old ac systems/ fridge systems and have all the tools/knowhow to gas them up etc.

how similar is phase cooling to aircon/fridge systems. can anyone explain the main differnces. has it been done before?

the basic idea is to find a cpu cooler with hollow heat pipes, and braise that onto where the "indoor" unit should be on a indoor/outdoor system. then run the ac as normal with some kind of interface between my cpu fan header and the ac unit controll. if i got an old supermarket outside/plant room fridge unit i could imagine running the cpu in the minuses on full oc load.

just wondering if this has been done before? if so can i have some links or info please, mainly on any pitfalls/differences in piping/gassing, and the control link between the cpu fan speed and the ac unit controll.

bear in mind i dont do domestic installs, i work on a large scale of refrigeration, ive scrapped in the past fully working units that can run 8-10 3meter freezer cases. i have access to lots of these working (scrap) units

so if you were thinking i was goign along the line of a domestic fridge freezer think again!!.

thanks in advance
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post #2 of 4
10/4/12 at 11:34pm
This is something I know very little about, but we've got an entire forum dedicated to phase change cooling--

http://www.overclock.net/f/133/phase-change

Good luck experimenting!
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Kathis
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post #3 of 4
10/7/12 at 2:47am
Jimmyhackers one fridgie to another.


I am not to sure if phase changing uses capillary tube or plate orifice for LRCD.



I have had similar thoughts a lot.

The best I could imagine for a setup would be using a capillary tube for the LRCD.

Then have the evaporator tubing directly brazed onto a copper plate that is attached to the surface of the CPU.



But I would also think a hot gas bypass would be needed for the times when there is very little load.

The problem is a CPU will only put out say 150-250w of heat at max and min probably less then 100w.


As for brazing onto a heat sink, I personally think you would have to be a machine to do this. The walls on them are so thin it would be a challenge.


As for which gas to use I think something like R22 or similar. It runs cold with decent pressures. As for using a more modern gas like the R400 series the head pressures would be higher making it more crucial of how good the brazing needs to be.

On the topic of gases I would also consider including some sort of suction line accumulator.


As for controlling it: Have it start with the computer and that it. The CPU would sit lower under idle and slightly higher during high use (ie folding) this is what the phase changing people do.


See every time I get thinking about this I start to realize that it would be easier to buy a phase changing unit and be done with it.

I am more then happy to brain storm this with you. biggrin.gif
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My current project
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post #4 of 4
10/12/12 at 5:02pm
Thread Starter 
thanks for the info.

i think i could manage to braise onto the copper coils from a finned cpu with copper heat pipes.
its quite an old one and i can say the walls are at least a mm thick which is thicker than the stuff i use at work.

id end up mounting the outdoor unit outdoors aswell and pipe it into my room. id aim to fiind an ac unit with a scroll fan so it can be ramped up and down etc.

several problems would be.....the ac unit should really be on before my pc starts. i could just turn the unit on max and see how cold i can run my pc all the time

if i over cool it can sub zero tempretures mess up a chip, i know condensation will but can anythign else bad happen of it?

my only worry is id have, as you say the output heat of a cpu at about 100 - 150w so if i get myself a 1kw freezer unit (smallest size i get for free) i dont want it sending liquid back to the compressor as there wasnt enough heat to "gassify" it. as id essentially be replacing say a rad with like 100m of piping down to a heatblock and about a meter of piping.
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