With regards to the page I linked to:
1. Looks like the calculated Q is only good if the fin spacing S is chosen to be the same as the calculated Sopt...
(based on the formulas here:
http://www.coolingzone.com/Content/D...Problem_2.html )
2. Infinite fin spacing = infinitely large rad = infinite dissipation
If you can accommodate that, go for it!!
I'm not too sure what your rad design is - if it's anything like the one on the OCers article you pointed to, then this calculator is useless as there are no 'fins'. Unless you're intending to add fins to it (a good idea) ?
... or when you say "spacing" are you talking about the
thickness of the box?
Cos this will affect the water side, not the air side...