[Bldg-sim] 90.1-1999 Budget Case fan power question

Dan Russell danr at engineeringinc.com
Tue Nov 11 11:17:30 PST 2008

Chris - I believe you are on the right track.

The following 90.1-1999 definition applies:

fan system energy demand (or fan system power): the sum of the nominal power demand (nameplate horsepower) of motors of all fans that are required to operate at design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.

So, you would have to include:  Supply fans (fan coils, make-up air unit), Return fans (if separate from supply fans) and Exhaust fans.


 Dan Russell, EIT

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris Jones
Sent: Tuesday, November 11, 2008 11:20 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 90.1-1999 Budget Case fan power question

My proposed design is a make-up air system serving four pipe fan
coils.  The Budget case is a VAV system, hydronic cooling and
heating.  11.4.3 (i) states that the BHP per cfm shall be the same as
the Proposed design up to the limit as described in  In this
case what is my proposed BHP / cfm.  Do I sum up the fan power and
air flow for the make-up air system plus all the fan coils?

Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005

Bldg-sim mailing list
To unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG

More information about the Bldg-sim mailing list