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Old 24th May 2012, 04:07 AM   #11
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Default I am going to cool 6 chip amps

I did do a computer one time with coolers and a old dorm refrigerator,lol we had to build a new power supply to run the cpu ,the one on board maxxed out ,we got it to run stable at 6 times it's normal time ,It was a amd 1000 chip,,,,,,I can't get heatsinks I want so I am going to build some aluminum boxes and mount to them ,you can make the boxes with one side a half inch or thicker and not drill and tapp all the way through,The coolness of the sink can be regulated by how much water you flow,I was thinking about a water cooler that's electric at the depot for under $ 100 it will run continuous cold water,,,,Wish me luck,lol.
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Old 24th May 2012, 03:29 PM   #12
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A very small and quiet fan pointing downwards to vent the sink might increase its dissipation potential. Plus it makes for a cleaner chassis with the little silent fan blowing off some dust (only if top mounted though).

I like it! And, if you did something clever with double layers at different diameters you could muffle the noise of the fan as well.

Blowing dust off? My guess is more likely blowing dust ON. With Solidworks you could model the temperature gradients and probably get it quite small (after 3 months of work!)
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Old 24th May 2012, 03:46 PM   #13
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I did do a computer one time with coolers and a old dorm refrigerator,lol we had to build a new power supply to run the cpu ,the one on board maxxed out ,we got it to run stable at 6 times it's normal time ,It was a amd 1000 chip,,,,,,I can't get heatsinks I want so I am going to build some aluminum boxes and mount to them ,you can make the boxes with one side a half inch or thicker and not drill and tapp all the way through,The coolness of the sink can be regulated by how much water you flow,I was thinking about a water cooler that's electric at the depot for under $ 100 it will run continuous cold water,,,,Wish me luck,lol.
In my office I have a Polish fridge, which has to be 30 years old, which is probably the best fridge I've ever had in terms of keeping cold. It doesn't have a pump - and when I first got it I thought it was broken. Does anyone know how it might work, because it could be easily minaturised (currently the volume isd about 800mm cubed), and would be ideal for CPU or chip cooling?

The brand is Predom if anyone wants to look it up - it is truly excellent.
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Old 24th May 2012, 05:07 PM   #14
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Gas powered fridges and freezers use a gas pilot light to generate the power to drive the flow around the heat exchanger circuit. It still has a cold section and a hot section just like a compressor powered heat exchanger circuit.

Is there a way to use the heat from the hot devices to power/drive the flow around the heat exchanger circuit? That would result in a quiet fanless cooling system that should do a good job of keeping the devices well within their SOAR and the cooling plate could still be small for integration into the power amplifier. It's just the external hot exchanger that will be big. A radiator hung on the wall?
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Old 24th May 2012, 05:31 PM   #15
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AndrewT, you mean the old absorbtion fridges that used ammonia, no ?
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Old 24th May 2012, 05:35 PM   #16
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Gas powered fridges and freezers use a gas pilot light to generate the power to drive the flow around the heat exchanger circuit. It still has a cold section and a hot section just like a compressor powered heat exchanger circuit.

Is there a way to use the heat from the hot devices to power/drive the flow around the heat exchanger circuit? That would result in a quiet fanless cooling system that should do a good job of keeping the devices well within their SOAR and the cooling plate could still be small for integration into the power amplifier. It's just the external hot exchanger that will be big. A radiator hung on the wall?
No gas here. And the radiator part is about the size of two heatsinks that you might have going down the sides of a 2U amp (ie. same total vol. - for the whole fridge, inc. freezer). More fins though.

I know Einstein came up with an idea for an evaporating/condensing fridge. I just don't know whether it was ever put into practice, or if this is it. But here there is def. no compressor and no noise at all.
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Old 24th May 2012, 07:59 PM   #17
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This silent fridge thing is very interesting.

I tried to find some info about it, somehow ended up in this thread:
No Compressor Fridge? (alternative energy forum at permies)

And now I am wondering about this:
"I've lived with old, inefficient fridges for about a decade now. Every time the cycle up (mine just did) I get a little bummed out. I keep thinking about the joke about the salesman who sold freezers to Canadians."

What joke?
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Old 24th May 2012, 09:01 PM   #18
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This silent fridge thing is very interesting.
Following that thread led me to a page that has an fridge that uses no electricity. I didn't quite follow the design and it didn't look that practical but it made me wonder what the electricity was needed for? Mine definitely defrosts if you unplug it, but if its not driving a pump, the only other thing it can possibly be doing is heating something. But what?

I know that the Southbank Centre has some curious system for its heating, taking energy out of the Thames, but I guess that it's a fridge in reverse. Though at the back of my mind (this is going back to '75 or so) I seem to remember it being electrical. Any other ideas, anyone? Peltier effect. or Peltier diodes, perhaps?

Last edited by ChristianThomas; 24th May 2012 at 09:13 PM.
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Old 24th May 2012, 10:01 PM   #19
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Peltier thermoelectric modules was a big thing for cooling cpu's a few years back, there are small fridges with peltier modules around. But I suspect this is too big for something like that.

The only thing i can find about that brand is that they made top loading washing machines.

Edit:
I remember a cooling system for graphic cards using "liquid metal" as they called it, the company making them used a system with magnetism for pumping the fluid through the system, allegedly completely silent.

Edit2:
"Besides the common technique of refrigeration using a compressor used in normal household refrigeration and freezers there are technologies such as for example absorption refrigeration and magnetic refrigeration. Although these designs generally uses a considerable more amount of energy compared to compressor refrigeration, other qualities such as for example silent operation or the ability to use gas can favour these refrigerations in small enclosures, mobile environment or in environments where failure would lead to devastating consequences."

http://en.wikipedia.org/wiki/Refrige...rgy_efficiency

http://en.wikipedia.org/wiki/Magnetic_refrigeration
Interesting.

Last edited by KaffiMann; 24th May 2012 at 10:16 PM. Reason: adding info
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