[Bldg-sim] 90.1-2007/LEED_Baseline pressure drop # and baseline fan bhp relation

[Nick Caton]

It sounds like you've got the right idea Nikola - must have just been a
Friday...

It does make sense if you dwell on it enough:  If your proposed system
has a ton of extra filtering to deal with, it wouldn't be fair if the
corresponding baseline fan were sized with a bhp appropriate to minimal
filtering, would it?  If you add up all the items that apply to your
proposed system from T 6.5.3.1.1B when figuring out your 'A' parameter -
increasing the energy consumption of the baseline system fan, then
you're effectively leveling the playing field for your proposed system.

90.1 is set up a little strangely in that we have to follow all these
sub-notes and bounce around the chapters to reference all the correct
tables, but I think you're following the right path.

Regards,

~Nick


NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com 


-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nikola
Kravik
Sent: Friday, January 07, 2011 8:52 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 90.1-2007/LEED_Baseline pressure drop # and baseline
fan bhp relation

Hi all,

Is there a place in 90.1-2007 that defines certain numbers for Baseline
pressure drop? 
(I've gone through the archives and addendum ac to 90.1-2004 that was
incorporated in the 2007 version and can't seem to find it, because I
guess there isn't such a thing as "baseline pressure drop" definition)

Can somebody chime in on the analogy for the baseline pressure drop
indirectly expressed through the Appx G Table-3.1.2.9 Baseline Fan Brake
Horsepower:
-I choose the type of the system (Constant or Variable)
-Per note below Table G3.1.2.9 I go back to Section 6.5.3.1.1 and define
the "A" parameter in the calc
-I add all the pressure drop adjustments that apply to my applicable
device for that particular system and add them to the baseline system
fan power to get credit when compared to my proposed case fan
power(pressure drop)?

...where I'm going with this; it's a bit confusing to use the baseline
CFM and pressure drop adjustments from the proposed model to get the
total baseline brake horsepower or maybe it's just Friday..

Thanks,
Nikola

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