Quote:
Originally posted by RoboTech
Am I correct in assuming that the thermal contact area (such as the core surface area) will have a big impact on a blocks C/W?
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Variable depending on design, but yes it is significant.
Much of the resistance is contact resistance. This contact resistance still applies to the die-pelt interface, but is much less severe across the pelt-block interface due to larger contact area. Second, a big part of C/W is due to the heat flux (load/area) rather than overall load. Sort of a double-bubble for increasing the contact area.
Note that blocks will react differently. ie, direct impingement does not benefit much from spreading the heat over the total baseplate area. Maze-style blocks would probably see the biggest bump.