[Equest-users] make exterior wall an interior wall

[Nick Caton]

Alright folks...

 

This is one of a number of things I really wish someone walked me
through when I was new to this - so pay attention if you're learning =)!

 

Attached images are a "visual guide" walking you through changing an
external surface into an adiabatic internal surface in detailed mode.
It took me 10 minutes to pull these together, but 99% of that was spent
creating/naming the images.  The process is simple.

 

Also, If anyone can answer this:  Is there any plan or consideration to
have images and other attachments like this included in the mailing list
archives for future reference?  I think it's a bummer that so many miss
out on really important email attachments (excel tools, example files,
studies, and other time savers).  If it were possible, I and others
might be more inclined to generate this sort of "mini-guide" visual
response knowing others could find and reference such information in the
future. 

 

~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: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nick
Caton
Sent: Tuesday, June 22, 2010 9:07 AM
To: Sami, Vikram; Reba Schaber; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] make exterior wall an interior wall

 

As further clarification,

 

If you delete any wall/ceiling/roof, you (1) remove both a source of
heat storage (thermal mass) while also (2) removing any heat transfer
across that surface.  As a caution:  Losing the first effect can be a
lot more significant that you might assume, depending on what you're
looking into.

 

If you instead change any interior surface type to "adiabatic" (in the
same wizard/detailed places you might select "air" or "internal"), you
will remove heat transfer while retaining the thermal mass of the
construction.  This may be the best route when trying to study a
perimeter classroom in isolation, for example.

 

Quirky thing is, you can't change an exterior surface type
(roof/floor/wall) to adiabatic, so as Vikram is saying you have to first
create an interior surface, copying across the geometrical properties
(polygon, vertices, azimuth...), then delete the exterior surface.  Make
sure to define and assign an interior surface construction (layers) if
the Wizards haven't already set this up for you.

 

~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 

 

 

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami,
Vikram
Sent: Monday, June 21, 2010 9:20 PM
To: Reba Schaber; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] make exterior wall an interior wall

 

Reba,

 

If you've gone through the wizard your interior and exterior walls
should be in tehir correct places.

 

Interioir walls should separate two spaces, and will define heat
transfer between those two spaces. You normally have to define which
space is on the other side.

 

Exterior walls define heat transfer between the space and the outside.

 

If you are in detailed mode, you can delete one and create the other as
a child component to the space. When you say large air space - is that
the air cavity in the wall? I'm not sure what resistance eQUEST
attributes to the larger air gaps, but in reality air cavities over a
certain size (I think 1 inch is probably the upper threshold) increase
their convective heat transfer and the cavity resistance should go down
(not up).

 

If your just looking to make it adiabatic, I think you should be fine
with just deleting the wall. You will lose the thermal mass of the wall
material though.

 

I would model it as an interior wall - especially if there is a space on
the other side.

________________________________

From: equest-users-bounces at lists.onebuilding.org
[equest-users-bounces at lists.onebuilding.org] On Behalf Of Reba Schaber
[Rschaber at PHMECH.COM]

Sent: Monday, June 21, 2010 9:43 PM

To: equest-users at lists.onebuilding.org

Subject: [Equest-users] make exterior wall an interior wall

 

I'm running a simulation on just a portion of a building.  eQuest sees
all walls of the polygon as exterior walls.  In reality some walls are
interior and will not have heat transfer.  Is there any way to make
eQuest see those walls as interior walls?  I've thought of defining
those walls with super insulation and a large air space so heat transfer
is negligible.  Anyone tried that?

 

 

         Reba Schaber      Mechanical Engineer, P.E.

                                     LEED Accredited Professional

 

 

 

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