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The Radiator
With the sink done, the next step was to assemble the necessary components to finish the system.  For the radiator, I chose a Hayden 6 pass aluminum transmission oil cooler.  The local auto parts house happened to have this model (403) on sale for about 1/2 price.  The cooler was a bit smaller that I initially thought I would need, but after going back over the numbers a couple more times, I decided it would work for the single TEC sink.  It ended up being more than large enough for the single TEC, and worked fine with the next dual TEC sink as well.
In the cooler's intended application, it handles a lot more heat and 
pressure than I would be subjecting it to.

The Pump
I knew from the beginning that I didn't want to use a submersible pump.  I hoped to be able to make this system self contained and portable.  Another consideration was that I didn't want the impeller shaft to have a seal that could wear and ultimately leak.  The solution was to look for a magnetic drive pump.  Mag-drive pumps have a magnetized impeller shaft which is not directly attached to the motor shaft.  Instead, the motor shaft turns a magnet, which in turn turns the impeller shaft.  This means that the impeller and shaft can be housed in a water-tight compartment with no seals to wear out with use.  This also means that they're a bit more expensive than a pump without the mag-drive.

I chose one made by Danner Mfg. Inc. called the Supreme Mag-Drive Utility Pump.  The model is # 2 and it is rated at 250 gallons per hour at a one foot head height.  I was pumping up to about a foot and a half and restricting the flow a bit.  I measured the output at just over 2 gallons per minute.

I bought the pump online at Aquatic Ecosystems.

Supreme Mag-Drive Model 2
Danner's GPH Specs

The Tank
I knew that I wanted some easy way of filling the system and removing air bubbles.  What I didn't know was how I wanted to do it.  I considered putting a bleeder bolt somewhere high in the system, but the highest point would be the heat sink.  That didn't seem like the best place for an opening in the system.  I though about how it was handled in automotive applications and adapted my tank from that .  The tank is a closed PVC box with a rubber gasket to seal the lid.  I have the container filled about 3/4 of the way with water.  I installed two water inlets below the water line in the container.  As the pump runs, the water is pumped in and out of the container.  If air happens to be in the lines, the air rises into the air pocket at the top of the container, while the inlet side continues to draw water.  I also made a fitting to attach temporarily to either of the fittings inside the tank to prime the system.  The tank holds about a pint of water.

A tank to purge any trapped air.
A Case
It was getting about time to give the system a try.  I started by setting up all of the components on the floor beside the computer.  Clear plastic tubing snaking this way and that.  I hung the radiator on a box shaped floor fan.  While the performance was great, the clutter on the floor had to go.  Back to the local home center to look for something to put all of this stuff in.  I found a large plastic tool case that was a little too big for the job, but had room to grow if I wanted to put a power supply inside it for a later project.
In place of the floor fan, a couple of 115 volt AC 4" Radio Shack fans move the air.
Click on image for a larger view.
The front of the case with the two 4" Radio Shack
65 CFM - 2200 RPM AC fans.
The rear of the case with the cut-out for the Hayden
transmission oil cooler - turned radiator.

The difference in water cooling as opposed to an air cooled sink is pretty amazing.  Once you try it, going back to air cooled is lacking.  After a month or so of running water cooled with a 40mm TEC, I decided to remove the TEC to see what water at room temperature would do.  This was done more for a point of reference than any real desire to run without a peltier.  The tests for the cooler without the TEC were done with the processor running at 464 MHz.

The slug temperature remained very close to the 
water temperature in the sink.  The water temp
ran between 1 and 2 degrees below room temp
due to the room temp being measured a foot and
a half higher from the floor.
The heat sink and water temp only rose about 3° 
during the looped time demo of Quake2.
The internal diode stayed at a respectable 90°.
As usual, I have no idea what the BX6r2 
motherboard sensor is reading!

With a 40mm - 52 watt TEC and copper cold plate attached to the cooler, I ran it for a couple weeks at 504 MHz.  I decided to try to push it up to 527 MHz.  I was amazed when it not only booted into Windows, but ran everything I could throw at it without a hiccup.  Pretty good for a processor that I once said would never hit 504.  The following tests were done at 527 MHz.

Because of the large copper cold plate, the slug cools 
off rather slowly.  However, with the thick plate, the
temperature swings between the CPU at idle and 
running under stress are kept to a minimum.
As you can see from the chart, the single 40mm TEC
has a hard time keeping up with the heat produced
by the Celeron at 527.  The water cooler takes the 
heat without a problem.

For a first attempt at a water cooled heat sink, I'm pretty pleased with the results.  I was pretty sure that a single 40mm TEC was not going to be enough to handle all of the heat from the processor, but it did keep the Celeron cool enough to hit all the speed that my PC100 ram would allow.  This was also the longest I had kept one sink on my Celeron in a long time.  With the temperatures only reaching about -2° at the coldest, (usually when I was reading online) I didn't have a problem with condensation.  The "cold" was kept to the area of the slug by the insulation.

All in all, this was one fun project.  But, me being me, I had already been working on plans for a second water cooler.  This one would be more conventional in design as I thought that the aluminum pins and copper base were overkill for a water cooled sink.  The next sink would also have dual 40mm TECs.  I'm looking forward to this!