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[BLDG-SIM] New Calculation method for Baseline Fan Energy in Addendum R



 

I was wondering if anyone out there can explain the new calculation shown for baseline fan brake horsepower in Table G3.1.2.9 of Addendum R to ASHRAE 90.1-2004?  At first glance, the equation doesn’t make sense because you are subtracting a relatively small number (0.0013+A) from a large number (CFMs) leaving you with a ridiculously large baseline fan motor brake horsepower.  Am I just reading this wrong or is there a typo?  Isn’t there an easier way out there to calculate baseline fan energy (please see version 1 of Appendix G for another confusing calculation)?

Andrew Craig, EIT, LEED® AP Mechanical Designer

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