[Equest-users] Building Geometry

[Jones, Christopher]

The energy model is idealized – there is no thickness to the walls.

Typically, modeling to the glazing line is preferred.  Net leasable area is to the window line unless there perimeter wall HVAC units, induction units for example.

In the case of thick walls, modeling to the window line penalizes the baseline case as the lighting and equipment power densities are per unit area.  For this reason, I would model this project to the inside of the exterior walls and to the centre line of interior walls.

Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Maria Elisa Rumeo
Sent: Thursday, March 12, 2015 2:51 PM
To: Farid Pour
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Building Geometry

Does anyone have experience with modelling thick-wall retrofits who can also answer my question?
It is a small house, so if I trace the interior dimensions I will get significantly different results than tracing exterior dimensions


On Thu, Mar 12, 2015 at 2:11 PM, Farid Pour <farid.pour at hok.com<mailto:farid.pour at hok.com>> wrote:
As far as I know, it goes in.

From: Maria Elisa Rumeo [mailto:rumeomar at gmail.com<mailto:rumeomar at gmail.com>]
Sent: Thursday, March 12, 2015 1:10 PM
To: Farid Pour
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Building Geometry

Hello,

It is a low-energy retrofit and the walls are really thick!
My fear is that by using the outside dimensions, then if the wall contruction goes 'outward' of these defined lines, then I am modelling a larger house ( the volume of the house in the model is greater than the actual volume) .

please help :)!

thanks,

maria

On Thu, Mar 12, 2015 at 2:05 PM, Farid Pour <farid.pour at hok.com<mailto:farid.pour at hok.com>> wrote:
It should not make that much of difference unless your walls are rally thick.   I suggest you trace the outside wall and then make sure of the wall thermal properties.
Farid
From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>] On Behalf Of Maria Elisa Rumeo
Sent: Thursday, March 12, 2015 1:03 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Building Geometry

Hello,

Can someone please help me with this:

I have an AutoCAD file of an old home that was retrofitted with thick (insulated walls). When I import this file and trace it to define the building footprint on eQuest,should I be tracing the OUTSIDE of the building (the brick face) or the INTERIOR of the building (the interior walls)? or should I draw a line in the middle of them and use that as my building footprint?

do you know the wall construction goes INWARD or OUTWARD from the building footprint you set?

thanks,

maria



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