Found it, looks good overall, but I think I may have spotted a brain fart
in the HTML version (haven't looked at the .xls yet), unless I'm missing something...
Part way down the sheet says:
Quote:
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Air Temperature Rise (dT) = 4.8119 Deg. C = 40.6614 Deg. F
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:shrug:
Now I may not follow what you are trying to say there, but if you are saying the 2 temps are equivalent, I disagree...
I suspect that you did the conversion as if it was 4.8*C in actual Thermometer temperature (*F=(9/5 x *C)+32). If I'm reading things right, it should have been 4.8*C of DIFFERENCE, which would have been just 9/5 x *C... (did you by any chance just tell the spreadsheet to do a "*C > *F conversion?)
I know my usual 'Quick & Dirty in Head Conversion Formula' is that *F ~ 2 x *C (works for small values of C) which gives me 9*F, Which is a BIG difference...
Now according to your spreadsheet, you were estimating a 350W load. That's probably fairly close to what I'll actually be trying to cool, 414W calculation not withstanding. I said 2-3*C delta, you came up with 5*C, which isn't unreasonable, but that's only about a 10*F increase, not the 20*F increase you were talking about at the start of this thread. Is it possible that you made a similiar sort of error in your earlier math?
Gooserider
(edited for grammar fixes)