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Well, even if the 100% efficiency is off, the calculated power ratios from no fan to maximum fan should be correct even if the calculated power usuage from efficiency is a bit off. My concern would be more if there was a signficant variability with rpms, say ... 45% at 1500rpm to 95% at 6500 rpm.
Do you think it would be safe to assume fairly equivalent efficiency value across the full rpm range?
Doug
Edit: negate that, I re-read your post and find I'm confusing the ICE with the fans motor. This is correct isn't it - the efficiency parameter is in consideration of the electrical motor.
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