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Originally Posted by joeyek
for the tube of a Rad, material is not the key of performance, but for the fins it is.
Like the fins in aircooling, aluminum fins of a rad never can be "longer" than copper one, check a 90's HC made in aluminum, the length of the fin between the tubes is much more shorter, u can easy tell it by comparing the numbers of the tubes in almost the same width of a copper fin HC and the aluminum fin one.
However, these fins in a HC are still shorter than 1/2" usually, further more the heat is conducted from the two sides(tubes), unlike the fins in aircooling only from one side(the base), all of these contribute to restraining the superior of copper fin 2.
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Yes.
In
my various plays with design .,using Al fins would, to get the same Finning Efficiency, reduce the spacing between flat water tubes to ~75% of that for Cu fins.