[Equest-users] Building Orientation Accuracy?

Mon May 17 13:24:45 PDT 2010

Otto,

I just looked at your revised files - you are still modeling two
seemingly fairly different classrooms.  Note your "North" classroom has
adiabatic internal walls/ceiling and your "South" classroom has heat
transferring ones.  I haven't scoured for other differences that may
well be in there regarding schedule assignments and such - I don't know
of a fast way to do so.

If you're truly concerned with eQuest's ability to correctly account for
a varying azimuth and want to test it, you could make your task easier
by creating a square classroom with identical walls on each side and
observe identical results with 0,90,180,270 degree azimuths.

~Nick

NICK CATON, E.I.T.

PROJECT ENGINEER

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olathe ks 66061

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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Otto
Schwieterman
Sent: Monday, May 17, 2010 3:07 PM
To: Paul Riemer; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Building Orientation Accuracy?

I fixed the differences and now I get the following results:

North Facing: Space Cooling: 4.1 MBTU, Space Heating: 21.7 MBTU

South Facing: Space Cooling: 4.3 MBTU, Space Heating: 18.7 MBTU

When I change the orientation 180 degrees, the results are:

North Facing: Space Cooling: 3.8 MBTU, Space Heating: 22.6 MBTU

South Facing: Space Cooling: 3.6 MBTU, Space Heating: 17.8 MBTU

These also seem incorrect for the same reason.

From: Paul Riemer [mailto:Paul.Riemer at dunhameng.com] 
Sent: Monday, May 17, 2010 3:56 PM
To: Otto Schwieterman; equest-users at lists.onebuilding.org
Subject: RE: Building Orientation Accuracy?

Otto,

Your north and south have different inputs.  I specifically noted
plenums temperature set points and plenum floor weight.

I suggest you clean it up and run it again.

Paul Riemer

Dunham

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Otto
Schwieterman
Sent: Monday, May 17, 2010 2:39 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Building Orientation Accuracy?

I have noticed that eQUEST does not accurately determine the cooling and
heating loads when rotating the building 180 degrees using the Azimuth
feature under the building properties in the detailed edit mode. I
created and attached a file where there are two classrooms. One
classroom faces north and one faces south. 

When I run the simulation I get the following results: 

North Facing: Space Cooling: 4.1 MBTU, Space Heating: 21.9 MBTU

South Facing: Space Cooling: 4.3 MBTU, Space Heating: 18.9 MBTU

When I change the orientation 180 degrees, the results are:

North Facing: Space Cooling: 3.9 MBTU, Space Heating: 23.0 MBTU

South Facing: Space Cooling: 3.6 MBTU, Space Heating: 18.1 MBTU

When I rotate the site 180 degrees the north and south facing energy
consumption is different (they should be exactly the same). Also, the
space cooling does not make sense because the building's weather file is
Dayton Ohio and the south facing classroom should use more cooling than
the north facing classroom.

This makes me assume that eQUEST has a problem with building rotation in
the detailed edit mode. 

Please check to see if I am assuming this correctly because this will
affect every LEED project.

Otto Schwieterman

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