[Equest-users] Concrete columns and beams

[Nick Caton]

Hi Ali,

A relatively simple/quick option:  Determine the area of column/beam
against the normal wall construction, then weight the conductive
properties together for a single "averaged" construction.

>From context and understanding this is your first model, I ordinarily
advise caution and careful judgment when choosing to define exterior
envelope constructions with the "weightless" U-value method.  Layered
constructions in contrast will account for thermal mass, and the
resulting tempering effects can significant impact the magnitude and
spread of hourly envelope loads modeled.  That said, it's ultimately the
modeler's call, and U-value definitions may be entirely appropriate.

If you do choose to use a layered construction, I would also create or
modify a layer specifically to bump up the net construction mass to also
reflect the weighted thermal mass of the wall.

Depending on geometry - you might consider supplementary building shades
if the protruding beams/columns have any significant role in
blocking/reflecting solar gains.

~Nick

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com 

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ali
Murat Tanyer
Sent: Thursday, December 01, 2011 7:40 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Concrete columns and beams

Dear all,

I am trying to model my first building. I have a very simple question:

I can select individual walls and edit their thermal properties. 
However, there are concrete column and beam within the wall. These frame

elements are visible from inside and outside. Obviously, the U value of 
my wall and the concrete frame elements are quite different. But I can 
only define one U value for the wall.

Is there a way to specify  that my wall contains concrete beams/columns 
with specified U values.

Thanks in advance.

Ali
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