[Bldg-sim] Appendix G - Exhaust Fan Power

Michael Rosenberg Michael.Rosenberg at state.or.us
Fri Jan 4 12:40:49 PST 2008


The values in Table G3.1.2.9 gives a total for bhp for the sum of all fans in each HVAC system, which includes "supply, return, exhaust, and relief (excluding power to fan powered VAV boxes)". Not for each separate fan. The exhaust fan is most likely exhausting air that has been supplied by some HVAC system and its bhp would need to be included in that systems calculation. I think that section of Appendix G is poorly written and could be clarified. 


Michael Rosenberg
Oregon Department of Energy
625 Marion St. N.E.
Salem, OR 97301-3742
Phone : (503) 373-7809
Fax: (503) 373-7806

>>> "Kevin Kyte" <kkyte at robsonwoese.com> 1/3/2008 8:11:51 AM >>>
Does Table G3.1.2.9 apply to stand-alone exhaust fans?  It seems that when
having a VAV system type the baseline exhaust fan power is a lot more then
the proposed design, and a baseline exhaust fan power calculated using the
constant volume calc gives a more reasonable baseline.  Any thoughts?

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