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Originally Posted by ricecrispi
I'm with Cathar on JoeC recent change in test setups. They stayed pretty much the same for how many years?
Well having a die size too large is not good for JoeC because reading the link supplied by bobkoure
Exploration of the Theoretical Limit of Thermosyphon Cooling System
A huge determining factor was area (cross section) of the boiling area interfacing to the heat source. Larger the area, better results. Explains why he got such a bad C/W for small die sim and a low C/W for large die sim.
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I am not sure it is all that bad. I estimate the condenser is probably .07-.08 C/W. (from comparable sized radiators tests)that would put the boiler in the .15 C/W range. Compared to OC waterblock tests on the same simulator it is up there in performance and it is still early in the development cycle. the best being .12 C/W
Just to note that while googling thermosyphons I came across a paper where the author had tabulated that there were over 2500 papers published worldwide on thermosyphons since 1998 - I am not sure I would want to sort through all that for the last word on the subject