[Equest-users] Building Orientation Accuracy?

[Paul Riemer]

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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