[Bldg-sim] G3.1.2.8 Interpretation Return Fans

[Robert Gengelbach]

My understanding is The baseline building needs to have the fan power of all fans, supply, return and/or exhaust modeled in accordance with G3.1.2.9.  It doesn't really matter if they are return or exhaust.  The proposed fan power should be modeled exactly as designed.


Robert Gengelbach, PE, LEED® AP
Sustainable Mechanical Design Associates, LLC
89 Monroe Center NW
Suite 302
Grand Rapids, MI 49503
P: (616) 776-9009
F: (616) 776-9010
C: (616) 570-2329
rgengelbach at sustainablemech.com

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-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of omoltay at mimtarch.com
Sent: Wednesday, February 24, 2010 1:04 PM
To: equest-users at lists.onebuilding.org
Cc: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] G3.1.2.8 Interpretation Return Fans

Dear All,

I would like to get your opinions on whether my interpretation of the
following regarding G3.1.2.8 is correct:

My proposed building is conditioned by fan coils and air handler unit
providing ventilation air. In such a system, there are only supply fans
(AHU supply, FCU supply) and exhaust fans (AHU exhaust). There is no
recirculation.

For the baseline case, according to G3.1.1A, I am modeling System 5 -
Packaged VAV with reheat. I am confused about whether to model return fans
with this.

G3.1.2.8 says that if the proposed case has return/relief fans, then the
baseline case should be modeled with these as well.

Does this mean I need to count the exhaust fans in proposed as
return/relief fans and model these in baseline as well in line with
G3.1.2.8?

Thank you for any replies,

Omer Moltay, LEED AP
Mimta Ltd.

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