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Originally Posted by Les
A new definition.
So what.
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Well, it's the same definition, just worded differently.
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Originally Posted by bob5195
(real c/w)/ideal(c/w) = efficantcy
where real c/w is pefromance minus tim and possibly a thin base plate of material which is needed to prevent excessive transfer.
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The watts are constant, so they cancel out.
We're left with efficiency = Real C / Ideal C.
As bobo says, this is all minus tim and bp, aka, the surface temperature where the convection(conduction) is taking place. Since this is relative to the water's temp, it's the exact same measurement of efficiency that you referred to above Les, and that I was talking about.
I haven't had the time to dig further into Les's analysis of h(eff) yet. Will do so this weekend.
As for nusselt & stanton numbers, I'll leave that stuff to the theorists to quantify. h(eff) is pretty much all I'm concerned about as a means of assessing design performance.