[Equest-users] [Bldg-sim] 90.1-2007 App. G baseline fan power question

Tue Jul 12 06:17:29 PDT 2016

This is totally appropriate as far as 90.1/LEED guidance.

I have in the past also pursued a “simplified” approach wherein I dump all Pfan power onto the supply fan and make the associated return fan “powerless” (very tiny kW/CFM).  I’ve been clear in documentation and that approach made it through a few reviews without comment.  This might for some baseline systems have some relative effect on baseline auto-sizing capacities considering fan heat loads relative to cooling coils, but in the aggregate I’m not certain this should have any substantial / consistent energy performance impact between projects.

Food for thought ;-),

~Nick

Nick Caton, P.E.

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  Energy and Sustainability Services
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  Schneider Electric

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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris Jones via Bldg-sim
Sent: Monday, July 11, 2016 4:15 PM
To: Jim Dirkes
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 90.1-2007 App. G baseline fan power question

Thanks for your response Jim.

Christopher Jones, P. Eng.

Rowan Williams Davies & Irwin Inc.
Consulting Engineers & Scientists
901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5
T: (519) 823-1311 ext 2052 

M: (416) 697-0056 

From: Jim Dirkes [mailto:jim at buildingperformanceteam.com] 
Sent: Monday, July 11, 2016 5:10 PM
To: Chris Jones
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 90.1-2007 App. G baseline fan power question

Nothing from GBCI on my projects.  My normal practice is to split the power roughly in proportion to pressure rise.

On Mon, Jul 11, 2016 at 5:03 PM, Chris Jones via Bldg-sim <bldg-sim at lists.onebuilding.org> wrote:

The App. G baseline is to have return or relief fans if the proposed case does. This would imply that the system fan power should be distributed between the supply and return fans in the baseline case but no direction is given in the Standard nor in the User’s Manual. My inclination would be to distribute the fan power in the baseline case using the same proportions as in the proposed case.

Has anyone had any experience with directions given by the GBCI in this regard?

Christopher Jones, P. Eng.

Rowan Williams Davies & Irwin Inc.
Consulting Engineers & Scientists
901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5
T: (519) 823-1311 ext 2052 <tel:%28519%29%20823-1311%20ext%202052>  

M: (416) 697-0056 <tel:%28416%29%20697-0056>  

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