[Bldg-sim] FW: [Equest-users] Wall classification for adjacentbuildings

[Mirza Sajjal]

Thanks for the quick response Nick. 

 

Do you also have an opinion on the code issue, will it have to be
compared to exterior walls or interior walls if the walls aren't really
"shared" but are adjacent to each other with no exposure to the
environment? What if the adjacent building is demolished, shouldn't the
HVAC system be sized to meet that condition (or the wall built up to
exterior wall performance values)? I'm curious to understand how this is
approached in an MEP/code compliance standpoint.

 

Thanks again for the feedback.

 

Mirza

 

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Tuesday, September 06, 2011 10:18 AM
To: Mirza Sajjal; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] FW: [Equest-users] Wall classification for
adjacentbuildings

 

Hi Mirza,

 

In my experience, "shared walls" are not counted as "exterior surface
area" for any WWR calculations or similar.  

 

In eQuest/DOE2 terminology:  "Interior walls" model heat transfer (or
lack thereof, in the case of an adiabatic wall) between two spaces.
They will not interact directly with exterior conditions.

 

Surfaces separating building spaces from outside ambient conditions are
"exterior" surfaces. 

 

There are no hard rules as to how you "should" model a shared wall, but
in eQuest you have at least a few options I think anyone would agree are
acceptable in most cases:

-          Assuming heat transfer between the associated conditioned
spaces is negligible, but assuming the thermal mass of said wall is
important for accuracy, model an adiabatic wall (default approach coming
out of the wizards in eQuest).

-          Assuming heat transfer between the associated conditioned
spaces is negligible, and the thermal lag caused by the mass is also
negligible for accuracy, simply delete any such walls and don't model
them at all.

-          Assuming heat transfer is important for the model's accuracy,
model a normal interior partition and also expand your model to include
the adjacent building space and its envelope, internals and systems.

 

If somebody demolishes half of your building in the indeterminate
future, I think we'd all agree that would probably warrant an update to
the model and you'd treat the surfaces newly exposed to the exterior as
such.

 

~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 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Mirza
Sajjal
Sent: Tuesday, September 06, 2011 8:52 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] FW: [Equest-users] Wall classification for
adjacentbuildings

 

Thought I'd send this out to the bldg-sim list as well.

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Mirza
Sajjal
Sent: Friday, September 02, 2011 12:50 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Wall classification for adjacent buildings

 

Hi All,

I was wondering if anyone has an idea on an issue that I've come across
regarding what is considered an exterior wall and whether the wall area
should be included in the window-wall ratio calculations. 

 

There are two existing buildings which have walls touching with no air
gap, but if one of the buildings were to be demolished the other will
not be affected i.e. structurally independent (although there is very
little possibility the building will be demolished). My question is
whether these walls are considered exterior or interior walls? My
understanding is that the energy model should simulate it as an
adiabatic wall but it should be considered an exterior wall for code
compliance and window-wall ratio calculations.

 

 

 

Any feedback is much appreciated. Thanks in advance.

 

Regards,

Mirza

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