Wow... all that and never tested it. Your amazing!
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I'm sorry, but this thing is just badly designed, plain and simple.
(A) In an ideal set up, you want a coldplate in contact with the cpu which is then clamped to the block with a peltier sandwiched in between.
In order for the peltier-block setup to be efficient, you need two things. You need a cold plate which is completely insulated save from contact with the cpu. That way, the peltier is only having to transfer heat from the cpu to the water block portion.
(B) Secondly, you need a water block which can remove the heat from the peltier and pass it into the water.
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(A) and (B) added for referral.
As per your words.. it must be an ideal setup.. because every thing you just said.. it has (A), except for the extended fins. It also have B which is the unit above the coldplate which rests on a peltier when it is installed in the system. The unit you are referring to was not designed to work without one. Running this unit without a TEC would be like running a car without gas. It wasn't designed to work without it.
Per the technical designer and tester of BC the manufacturer. They have never had one freeze up when mounted and used within designed specs, and he referred me to
thispicture. He pointed out that the unit has no mounting screws holding it down to the CPU on the [H] article. And the system has no power on the board (far right of picture). Both or one of these will always cause condensation when working with a TEC, any TEC of capable power. In order to have had that much condensation, you would have had to run the unit 10 min (w/85w pelt) in a very humid environment with the cpu not even powered on, or the block left unscrewed to the powered cpu. This apparently was the case.
I will test his conclusions when I purchase one when they are for sale. The unit comes with an 85 watt pelt. The only way to get one different is to buy it seperately and add it yourself.
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Companies like swiftech have spent a lot of time perfecting there waterblock designs to efficiently remove heat from a processor, and it is no different for removing heat from a peltier. So why should you need such a different block design.
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Ask every block maker in these forums why you would want a different block design. It depends on "what" you want your unit to do and "what kind" of environment you are making it for. Believe me, if swiftech had ALL the answers for everyone, then this forum wouldn't exist.