Hello,
I'm confused with the two tables. In Table 6.5.3.1.1A option 2, the limit is fan system input power; whereas in Table G3.1.2.9, the limit given by the same equation is brake horse power, and to get the input power Pfan, we need to use Pfan = bhp / motor efficiency.
Isn't it that the two tables contradict each other?
Thanks!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
July 1, 2016 - 11:15 am
I don't see a contradiction.
Table 6.5.3.1.1A does not limit the fan system input power, it is the BHP, which does not account for the conversion to watts and the motor efficiency. So the formula in Table 6.5.3.1.1A limits the BHP and the formula in G3.1.2.9 converts the BHP to watts.
Ameet AA
41 thumbs up
July 10, 2016 - 11:29 pm
Thanks for the clarification!
I think the confusion arises from the term "fan system input power". My initial understanding of "input power" includes motor. But apparently it's not.