[Equest-users] Slab extending through wall

[Bishop, Bill]

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_Bridges___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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P   Sustainability - the forest AND the trees. P



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<mailto:dgriffin at etcgrp.com>
www.etcgrp.com<http://www.etcgrp.com>

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Energy Engineering for a Sustainable Future
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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<mailto: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<mailto:kcoleman at nexant.com>

P Please consider the environment before printing this email

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