[Bldg-sim] (no subject)

[Nick Caton]

The best overall advice I can give is... 90.1 Baseline's aren't supposed
to make sense.  ;)

 

The more nuanced response would be... they aren't supposed to reflect
common design, necessarily.  Yes, the system and it's properties vary
with climate, occupancy and building-size/properties... but don't
misinterpret any part of the prescriptive baseline requirements as being
any more than a baseline - an objective set of decisions from which we
can measure a comparative performance level.  

 

To check your findings, as I happen to have 90.1-2004 in front of me,
you are correct assuming your proposed design has electric heating and
assuming you're working under 90.1-2004. 

 

PSZ's are not "preferred" unless the engineer of record decides they
are, regardless of what your baseline happens to be.

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of
mike584595 at aol.com
Sent: Monday, March 29, 2010 8:47 AM
To: equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] (no subject)

 


All:

 

I am modeling a two story office building that is 20,000 square feet.
The actual building employs a packaged rooftop unit with VAV's and
electric reheat.  If I read ASHRAE 90.1 correctly, I am to use System 4
for the baseline modeling.  This is in stark contrast to what is
actually installed.  

 

If I am understanding this correctly, do I take from this that Packaged
Single Zone Heat Pumps are preferred in this application?  

 

Thanks,

 

Mike Porter

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