Just want to let you know I'm not ignoring this issue. (In fact I mentioned it as a 'gaping hole' at one point.)
I need some time to get my head around the problem, but my understanding is a secondary issue.
The real issue of course is the testing and resultant data. Could you be persuaded to do enough testing that reasonable extrapolations over the popular families of radiators could be done? What form could such persuasion take? (I've got a firstborn I'd be willing to part with on occasion.)
It's possible that some of this data could be gotten from manufacturers. Lytron publishes the necessary data. (Although some rather extreme interpolation is required to get the thermal resistance for an arbitrary operating point based on the Lytron graphs.)
I assume auto manufacturers base their HC selection on some design criteria. (How relevant it is at our operating point(s) may be an issue.)
Any good shmoozers out there willing to try extracting data from manufacturers?
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