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Originally Posted by bobo5195
. Notice alos how large the error bars are so this eff value even if it is right is clearly not acceptable as a good test.
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Think is partially covered by : :
" was measured with a thermal anemometer and a traverse across the 6" duct used for a 'wind tunnel'
one thing is quite certain, the 'tunnel' - not being calibrated - IS going to be off at at least one end of its range, and likely both"
Plus the measurement error bars are some what arbitrarily set(case of ask Bill) and think your Cp and Density ranges are rather large(no numbers just ....)
(Fan+Rad)'s Eff. may well be a better option
Entropy - dunno but happy as long as don't bring in activation volume