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Old 22nd April 2013, 11:39 PM   #31
bcmbob is offline bcmbob  United States
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Hey X,

Lots of good useful information. Lets me know I have lots of room to downscale later versions and still maintain efficiency. This pump (Danger Den DD-CPX1) is capable of 132 GPH but won't run at anything near full speed. I have two new AC pond pumps to try - the smallest rated at 75 GPH @ 1 foot. Still lots of room to play with.

I am considering using just one finned panel mated to some 1/4" flat stock as one alternative, and a sandwich of flat stock with a snaking path cut with an overhead mill. Have to figure a way to worm my way back into the training center shop at my former employer.

Like the stainless steel wool idea. Sounds more useful and simpler than plugging and adding holes to control the flow rate and path. I'll try it with the smaller cooling block.
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Old 23rd April 2013, 12:34 AM   #32
bcmbob is offline bcmbob  United States
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Sorry guys - Re-sizing the large photos doesn't feed through to the thread. I'll create a smaller faster internal version and ask the admins to do a replacement in a day or two.

Lessons Learned.
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Old 23rd April 2013, 10:11 PM   #33
xrk971 is offline xrk971  United States
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Bob,
The heat removal liquid to air xchanger may be the limiting point. That needs to be sized greater than heat output you need to remove. Have you considered heat pipes mounted to aluminum blocks for mosfets and fins with fans on the removal end? Computer cpu heatsinks often use heatpipes and are cheap. Cpus are about 100 watt max so one for each mosfet? Of course one can build diy heat pipes from copper pipe, distilled water and stainless steel wool.

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Old 24th April 2013, 08:07 AM   #34
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How about submerging the whole thing in oil?

Custom PC; Mineral Oil Submerged Computer
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Old 24th April 2013, 07:22 PM   #35
xrk971 is offline xrk971  United States
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I would hate to clean off the oil everytime I had to fix or repair a part. Interesting conversation piece but there is not enough heat to need to cool it like a substation transformer. Btw, high quality mineral oil isn't cheap. If the components were cleaned so that they had no salt residue, pure distilled/de-ionized water can be used as a coolant. Although parts need to be rust-free. This is done to cool HV flash lamps in big laser systems. The pure water doesn't conduct electricity even for 3000 volt discharge lamps.
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Old 24th April 2013, 08:54 PM   #36
bcmbob is offline bcmbob  United States
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Sorry, No oil and no liquid nitrogen

Just fired up about an hour ago. The cooling system is working thought not yet uniform. The fluid isn't reaching the right side at full flow. I'll use some of X's steel wool to adjust. There is a small gap between the halve which is probably leaking by more than I had planned.

Only using a Walkman as source and and the IR gun for readings so far. Later I'll add a pre and use the thermocouple for more accurate readings. The fan and pump (both 12 VDC) are powered by a single 7.5 1A wallwart "Y"ed to sockets. Totally silent at one foot. I'll do a recording and post a link.

So Far So Good. Room temp was 70 F for tests.
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Old 25th April 2013, 12:08 PM   #37
bcmbob is offline bcmbob  United States
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The earlier photos have been downsized successfully. Hope that helps.
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Old 1st May 2013, 05:07 AM   #38
xrk971 is offline xrk971  United States
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Nice work Bob. It looks like a water cooled laser power supply more than an audio amp! Here is what I was telling you about how efficient water cooling is. There are like 20 TO3 power transistors on this laser power supply which as I recall rejects a boatload of heat as the thing is 240vac 3 phase at 30 amps. Just a simple aluminum block with some copper tubing bonded to it.
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Old 6th May 2013, 11:11 PM   #39
bcmbob is offline bcmbob  United States
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Default Sharp Right Turn !!

In the process of redesigning/compacting the cooler for the F5 so I put the Honey Badger clone on-board. Been running all afternoon and water block hasn't moved above room temperature. I've been distracted by a speaker project so no flow/fan readings yet. As they say in the software world "Real soon now"

The amps are pushing the Coppers from PE DIY. Nice combo! No Leaks!
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Old 7th May 2013, 08:25 AM   #40
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Default very impressive

Very impressive!

I like it a lot...

but my hearth belongs to large aluminium finned heat sinks...

love this one, for example...

Hi-Fi - a photo on Flickriver

kind regards

Pedro
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