I understand your idea however the problem is that the iridium components do not generate EU from stored heat.
what you could do (and I have done) is make a Mark I out of what would of been a mark II by replacing all cooling elements with Heat converters.
and thus you get more efficiency out of your uranium (which is actually power produced / amount of uran cells / 5)
Edit: I assumed that this was not the case since I simply turned off the reactor with Redstone. while watching the Converters cool down I saw that no power was produced this might be a possible bug that you should look into.
good method of research, well done
@ 7Roses yes I am sorry for not sending you test result before I have been having trouble with minecraft 1.7.3 in particular MLMP which in a fit of insanity I deleted and was unable to redownload before today testing will commence when I get home today and I am once again sorry for the inconvenience.
about an advanced upgraded heat converter It cant be made yet because the recipe would require a Forcefeild generator surrounded by 4 iridium and 4 heat converters. it would have the stats of cooling 12 heat (yes very op) and producing 4 EU/t (it uses 2 EU/t to help cool itself) the fact that to make one you would have needed to use up over an entire stack of UU Matter and a forcefeild generator slightly offsets the OPness I think
my thoughts go like this:
small low tech uses up lots of resources for less energy > higher tech and processed items give more energy > high tech gives near godlike powers and uber energy gain with absurd resource usage.