[Bldg-sim] ASHRAE 90.1 fan power limitation calculation question

MIke Tillou michael.tillou at gmail.com
Wed Jul 29 15:58:18 PDT 2015

HI Chris,


The base  fan power allowance already includes the necessary pressure drop for return/exhaust dampers  in the air handler.  The adjustment for exhaust/return control devices refers to damper boxes or other devices used to control space pressurization like you would typically find in a laboratory or hospital.  








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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Wednesday, July 29, 2015 6:06 PM
To: bldg-sim at onebuilding.org
Subject: [Bldg-sim] ASHRAE 90.1 fan power limitation calculation question


For the baseline fan power limitation, the pressure drop allowances are defined.  I am a bit fuzzy on the definition of "Return/Exhaust Control Devices".  A system with a return fan and OA economizer typically has dampers to control the flow of the OA, return/exhaust air streams.  Would these dampers qualify as a Return/Exhaust Control Device?


Christopher Jones, P.Eng. 
Senior Engineer


WSP Canada Inc.

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4
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www.wspgroup.com <http://www.wspgroup.com/>  



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