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DigitalPirate Back to the topic. I'd say that a rad like that would be really more work than it's worth, when like SYSCrusher said, you can pick up a heatercore for 30-35 bucks. If you want more surface area, cut the radiator off a refrigerator. Wait a minute, that sounds like an idea I can use.
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Not sure the reefer rad would work well - those are designed for very high DeltaT's w/ a different medium - The ones I saw all had very long small diameter tubes (High coolant flow resistance) with big gaps between the pipes, and widely spaced fins. (Good for airflow, but bad in terms of minimizing the thermal conduction distance. If I were going for big cooling area, I'd stay in the automotive world, skip the heater core, and go for a full size radiator. It would have really good coolant / air exchange surface, low coolant flow resistance, and about the same airflow resistance as a heatercore - presumably one would put either an electric automotive rad fan on it, or a bunch of 120mm's.
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Hey gooserider, this is off topic, but stay away from the IBM SCSI HDDs. I had four die at work, all within a year. They were all replaced by warranty, but the Seagates run forever. Just a little piece of friendly advice.
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Normally I agree, I've been a Seagate user since my first 251-1 years ago. (and they were the brand of choice at my former employer where we were using them in "five nines" grade high reliability systems) However I just purchased a bunch of 9GB SCSI drives at a really good price, and the lot included a couple of IBM Ultrastar units - haven't tested them yet as I need a couple of SCA-80pin adapters... Will keep your comment in mind however, and not use them for anything critical.
Gooserider