[Equest-users] Slab extending through wall

Mon Nov 4 13:55:48 PST 2013

Great report ..... thanks.

Michael Hupel, B.Tech, CEM, LEEDRAP

Senior Mechanical Designer

Aegis Engineering Inc.

56 Pennsylvania Ave. Suite 18

Concord, ON L4K 3V9

(905) 761-1264 ext. 24

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(647) 702-3316 cell

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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop,
Bill
Sent: November-04-13 4:42 PM
To: David Griffin; 'Coleman, Kevin'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Slab extending through wall

Here's a timely report on effective R-values of assemblies with slab/balcony
thermal bridges:

The Importance of Slab Edge and Balcony Thermal Bridges
<http://www.rdhbe.com/database/files/library/Balcony_and_Slab_Edge_Thermal_B
ridges___1___R_values_and_Energy_Code_Canada__Sept_24_13.pdf> 

Regards,

Bill

William Bishop, PE, BEMP, BEAP, LEED AP | Pathfinder Engineers & Architects
LLP

Senior Energy Engineer

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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of David
Griffin
Sent: Monday, November 04, 2013 4:20 PM
To: 'Coleman, Kevin'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Slab extending through wall

Kevin,

I'm fairly sure eQUEST is not even going to closely approximate the heat
loss/gain accurately unless you dial the loads in manually which means you
have to calculate them by hand first. I suggest referring to
ASHRAE-D-RP-1365 for guidance on estimating the loads. The section you are
interested in starts on page 35.

Thanks,

David W. Griffin II

Energy Analyst

ETC Group, LLC

801-278-1927 x 128

Cell 480-736-2945

dgriffin at etcgrp.com

www.etcgrp.com

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Energy Engineering for a Sustainable Future

1997 South 1100 East, Salt Lake City, UT 84106-4471 

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From: Coleman, Kevin [mailto:kcoleman at nexant.com] 
Sent: Monday, November 04, 2013 11:56 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Slab extending through wall

I am evaluating a new 10-story hotel design that is proposing glass curtain
walls and pre-tensioned concrete floors that project beyond the walls. On 3
sides the projections are minimal (6 inches). However, on one side, the
projections extend about 3 ft. 

For the small projections, I intent to use the following method recommended
in the thread below. "In screen 4 of 25 of the DD shell wizard you can
specify "Slab Penetrates Wall Plane" (check box)."

I am interested in any tips for modeling the thermal impacts of the larger
projections. Thoughts? (I plan to use window shading for the light/shading
impacts.)

I am hopeful that the analysis will help convince the design team to
incorporate some insulation and thermal breaks!

Thanks in advance!

Kevin

Brian Fountain bfountain at greensim.com 

Mon Dec 6 11:45:18 PST 2010

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In screen 4 of 25 of the DD shell wizard you can specify "Slab 

Penetrates Wall Plane" (check box).  If you do, eQUEST created a new 

wall type of height equal to your slab thickness and composed of 1' of 

concrete plus any slab edge insulation you specify on the same wiz 

screen.   That provides a parallel path for the heat transfer from the 

balcony or slab edge.  Not exactly 2D heat transfer modelling -- but at 

least you aren't ignoring the effect of the slab edge or balcony.

Kevin Coleman, CEM, LEED AP  │  Project Manager │   Nexant, Inc.  │ Demand
Management 

1232 Fourier Drive, Suite 125 │ Madison, WI 53717 │  608.824.1230 │
kcoleman at nexant.com

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