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Old 18th June 2013, 09:59 PM   #1981
bcmbob is offline bcmbob  United States
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Here are some photos of the latest attempt to combine computer liquid cooling and power amps. This one is performing far beyond expectations. I jokingly have dubbed it the “flush”, as it based on the same principle as the drain tube in the water tank off a ...umm water closet. Great credit goes to XRK971 here on the forum – he informed me that water has an enormous heat adsorption capacity – far beyond any metal. Many thanks Mr. X.

I selected a 1” X 1” X ¼ aluminum tube because of it's natural heat absorption and it also allowed comfortable margins to use threaded 6-32 bolts on the ends. Every attempt to use blind holes where possible was made to avoid leaks. The internal drain tube is 5/8” standard copper tube and extends to within a 1/4” of the top of the cooler. That insures all air will be pushed out of the cooler body and eliminates the need for a separate external return tube or hose. Drilled laminated Plexiglas also serves to minimize many leak prone hose elements. All of those mating surfaces have automotive paper gaskets that swell when a liquid is present, and allows diss-assembly without scraping off a lot of dried goo.
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File Type: jpg 20130618_174441.jpg (153.7 KB, 1253 views)
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File Type: jpg FC (1).JPG (91.7 KB, 1181 views)
File Type: jpg FC (2).JPG (80.7 KB, 1178 views)
File Type: jpg FC (3).JPG (71.2 KB, 1160 views)
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Old 18th June 2013, 10:03 PM   #1982
bcmbob is offline bcmbob  United States
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The radiator is actually a heater core from a Ford Mustang purchased years ago from the former computer cooling enterprise – Danger Dan. They are available at most auto supply stores and of course, your local junk yard. This one was ~ $25. The fan is a Thermalright TR TY – 150. It is capable of rotating between 500 and 1100 RPM.

The water circulation system consists of a tiny DC submersible pump, again to eliminate tubes and hoses even more. In and out flow is accomplished using 3/8 copper tube. The extended return terminates at a point below the functional water level and defeats the natural tendency of water to seek it's lowest level. As long as the loop is sealed the reservoir can be located at any location.
Attached Images
File Type: jpg FC (4).jpg (145.0 KB, 548 views)
File Type: jpg FC (4a).jpg (106.7 KB, 447 views)
File Type: jpg FC (6).jpg (124.5 KB, 432 views)
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File Type: jpg FC (18).jpg (152.8 KB, 418 views)
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Last edited by bcmbob; 18th June 2013 at 10:07 PM.
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Old 18th June 2013, 10:05 PM   #1983
bcmbob is offline bcmbob  United States
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So how efficient is it? I almost fell off my chair in disbelief at the first test Friday evening. With the F5 operating for forty minutes, ambient was 26 C, cooler was 27 C and the bolt on the power transistor was 27 C.

WOOOPPPEEE !!

Those temps stayed consistent for over an hour. A quick message to 6L6 confirmed it was actually running far below optimum temperatures for the F5. In all honesty, I had intended this radiator for a Burning Amp project in the future, but as the previous version (#4), using a double thick radiator with two 80 mm fans only produced .045 c/w (less than air systems), I went for “Mustang Sally” as Mr. X calls it.

The first test used an 8.5 VDC wall wart for the fan and a 5 VDC for the pump. No sound could be heard at 2 feet. I oriented the fan to draw air in to use the case as a noise dampener – if necessary. Using the 5 V PS for both fan and pump all but eliminates any concern for rotation and/or vibration noise. I'll include a recording in the full build post to come later on the other thread.

I started a presentation chassis a few days ago that strives to keep the entire system as compact as possible. It is a work in progress and I skipped several elements such as the thermistor system, a power switch/LEDs and both the radiator and the reservoir still need drains. It's very utilitarian now and needs a lot more wood trim to cover screws and rivets and other cosmetics. The top is actually phoney, but I'm tired.

All in all, I'm quite happy with the results. The next application appears to be the BA project packed in a 8” X 10” X 12” chassis with maybe four output boards . I'll probably bump this F5 back down to a standard 120 mm system that works well with the Honey Badger clone.

Now that's a "COOL" F5 amp,
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Last edited by bcmbob; 18th June 2013 at 10:15 PM.
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Old 18th June 2013, 10:06 PM   #1984
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by bcmbob View Post
..... water has an enormous heat adsorption capacity – far beyond any metal.
water removes heat very fast
but only if you continue to remove the accumulated heat from the water
or else the cooling process ends

oh lord, I had not yet seen the last page coool
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Old 18th June 2013, 10:23 PM   #1985
AudioSan is online now AudioSan  Norway
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WOOOOW exelent work
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Old 18th June 2013, 10:48 PM   #1986
bcmbob is offline bcmbob  United States
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Thanks, Lots of fun to do.
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Old 18th June 2013, 11:00 PM   #1987
xrk971 is offline xrk971  United States
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Awesome work Bob! Congrats on a very cool amp.
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Old 18th June 2013, 11:05 PM   #1988
bcmbob is offline bcmbob  United States
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Thanks Mr. X. You know I'll be depending on your knowledge and background for the next one.
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Old 18th June 2013, 11:06 PM   #1989
duder1982 is offline duder1982  United States
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Thats pretty neat. Do you ever have to replace or add water if so how often.
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Old 18th June 2013, 11:12 PM   #1990
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You should put a few drops of BLEACH in the water to kill some bacterias or the water will start smelling bad with time.
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