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Originally Posted by joeyek
What is concerned in my calculation above focus on the heat transfer through the tube to outside, just like the base of a aircool heatsink, yes like u said, the soldering or some other joint technology are absolutely important, but no matter which thchnology u choose the heat transfer through the base is the same, when ignoring the second path for heat loss.
Jaydee, I said that is not important only wanna prove brass is not a loser when acting as the tube in a rad comparing to copper and aluminum, even it has a 1/4 conductive K of copper, that is all. However there is still some space to choose another metal with a lower conductive K according to my calculation, of cource at first make sure all we talk about is the big or huge rad.
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Ok, I misinterpreted your comments some. I thought you were saying it didn't matter much what the material was for the tubes not just copper brass or AL.