[Equest-users] Slab extending through wall

[r s]

Some more references

1. See attached " A Bridge too far' from the ASHRAE Journal, Oct 2007.
(This is freely available on the internet)

2. Also read the ASHRAE Journal July 2012 issue   Thermal Bridge
Redux<https://www.ashrae.org/File%20Library/docLib/Journal%20Documents/2012July/060-068_buildingsciences.pdf>.
*Joseph W. Lstiburek.* P. 60. July. (Will require ASHRAE login info)

3. There was a presentation in the 2012 ASHRAE Energy Modeling Conference
Atlanta that detailed out the impact of extended slabs and the effective
R-values. Although I do not have details of that presentation, maybe
someone does.

Regards

Ramya Shivkumar


On Mon, Nov 4, 2013 at 4:55 PM, Mike Hupel <mhupel at aegiseng.ca> wrote:

> Great report ..... thanks.
>
>
>
>
>
> *Michael Hupel*, B.Tech, CEM, LEED®AP
>
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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_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*
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> *Senior Energy Engineer*
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> *From:* equest-users-bounces at lists.onebuilding.org [
> mailto:equest-users-bounces at lists.onebuilding.org<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
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> ETC Group, LLC
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> *From:* Coleman, Kevin [mailto:kcoleman at nexant.com <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
>
> Previous message: [Equest-users] balcony
>
> Next message: [Equest-users] Shading
>
> Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
>
>
>
> 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
> <kcoleman at nexant.com>*
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