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I actually helped to develop a method to model thermal bridges in
DOE-2 back in 1986 that has never been widely disseminated, although
I still find it the most practical way to model 2-D heat flows in
whole-building simulations.<br>
<br>
This method uses a two-dimensional finite-element program (WALFERFN)
that calculates one-dimensional equivalent response factors which
are written directly into the DOE-2 layers library (BDLLIB.DAT),
which can then be called by DOE-2 just like any other response
factor in the library.<br>
<br>
I've always used this technique in my residential modeling, with the
added benefit of not needing to input duplicate sets of wall layers
for the stud and non-stud portions, which measurably simplifies the
models and makes them easier to read. The last time I did
significant work on this subject was in 2000-2002, when I created
for the California Energy Commission a library of over 100 wall
layers with metal framing and thus considerable thermal<br>
bridging. I compared the wall assembly U-values to that calculated
by ORNL's Heating-7 program, and they were<br>
right on. Unfortunately, a few years after the project was
completed, the Commission decided to move to EnergyPlus as their
reference program, and so this work was effectively abandoned.<br>
<br>
For more information on this technique, i.e., creating 2-D response
factors, please see this report:<br>
<a class="moz-txt-link-freetext" href="http://www.whiteboxtechnologies.com/PAPERS/96_12_YJH_2Drespfacs_CEC_rpt.pdf">http://www.whiteboxtechnologies.com/PAPERS/96_12_YJH_2Drespfacs_CEC_rpt.pdf</a><br>
<br>
If there's anyone who's still running DOE-2 in batch, rather than
just the eQUEST interface, this procedure should be quite
understandable. Just e-mail me and I'll be happy to give you a copy
of the WALFERFN program and some sample input files. <br>
<br>
Joe <br>
<pre class="moz-signature" cols="72">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
<a class="moz-txt-link-freetext" href="http://www.whiteboxtechnologies.com">http://www.whiteboxtechnologies.com</a>
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 1/28/2016 1:22 PM, Jim Dirkes wrote:<br>
</div>
<blockquote
cite="mid:CAFydjmSxPzhKYyti2-9CCu929=G58PkRVJ8UfNi7XvpJth-+FA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:tahoma,sans-serif;font-size:large;color:#b45f06">There
is also a landmark study by Morrison Hershfield in Canada
which I don't have access to at the moment that should provide
guidance.</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Jan 28, 2016 at 4:11 PM, Marcus
Sheffer <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:sheffer@sevengroup.com" target="_blank">sheffer@sevengroup.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Follow the
guidance in ASHRAE 90.1 Appendix A to determine the whole
assembly values.<br>
<br>
Marcus Sheffer<br>
7group<br>
<br>
-----Original Message-----<br>
From: Jones, Christopher [mailto:<a moz-do-not-send="true"
href="mailto:Christopher.r.Jones@wspgroup.com">Christopher.r.Jones@wspgroup.com</a>]<br>
Sent: Thursday, January 28, 2016 8:30 AM<br>
To: Luis Peréz-Lombard; <a moz-do-not-send="true"
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
Subject: Re: [Bldg-sim] MODELLING THERMAL BRDIGES IN e-quest
or DOE2<br>
<br>
Hello Sir,<br>
eQuest does not have the capability to directly model
thermal bridges. The typical methodology is to calculate the
effective U-value of the insulation/thermal bridge layer
when building your layers for the construction. BC Hydro
has published significant research on building envelope
thermal bridging. See the lower portion of the webpage:<br>
<a moz-do-not-send="true"
href="https://www.bchydro.com/powersmart/business/programs/new-construction.html#thermal"
rel="noreferrer" target="_blank">https://www.bchydro.com/powersmart/business/programs/new-construction.html#thermal</a><br>
<br>
<br>
<br>
<br>
Christopher Jones, P.Eng.<br>
Senior Engineer<br>
<br>
WSP Canada Inc.<br>
2300 Yonge Street, Suite 2300<br>
Toronto, ON M4P 1E4<br>
T <a moz-do-not-send="true" href="tel:%2B1%20416-644-4226"
value="+14166444226">+1 416-644-4226</a><br>
F <a moz-do-not-send="true" href="tel:%2B1%20416-487-9766"
value="+14164879766">+1 416-487-9766</a><br>
C <a moz-do-not-send="true" href="tel:%2B1%20416-697-0056"
value="+14166970056">+1 416-697-0056</a><br>
<br>
<a moz-do-not-send="true" href="http://www.wspgroup.com"
rel="noreferrer" target="_blank">www.wspgroup.com</a><br>
<div>
<div class="h5"><br>
-----Original Message-----<br>
From: Bldg-sim [mailto:<a moz-do-not-send="true"
href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>]
On Behalf Of Luis Peréz-Lombard<br>
Sent: Thursday, January 28, 2016 4:08 AM<br>
To: <a moz-do-not-send="true"
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
Subject: [Bldg-sim] MODELLING THERMAL BRDIGES IN e-quest
or DOE2<br>
<br>
Dear building simulation colleagues,<br>
I would very much appreciate any insights or work around
to simulate envelope thermal bridges in e-quest.<br>
Sincerely,<br>
LPL<br>
-------------------------------------------------------------<br>
Luis Pérez-Lombard<br>
Dr. Ingeniero Industrial<br>
Profesor Contratado Doctor<br>
Departamento de Ingeniería Energética<br>
Escuela Superior de Ingenieros<br>
Universidad de Sevilla<br>
Camino de los Descubrimientos s/n<br>
41092 SEVILLA<br>
Tfno.: 95.448.72.56<br>
Fax: 95.446.31.53<br>
e-mail: <a moz-do-not-send="true"
href="mailto:lpl@us.es">lpl@us.es</a><br>
-------------------------------------------------------------<br>
<br>
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-- <br>
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<p><span
style="font-size:10pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-repeat:initial"></span></p>
James V Dirkes
II, PE, BEMP,
LEED AP<br>
CEO/President<br>
The Building
Performance
Team Inc.<br>
1631 Acacia
Dr, GR, Mi
49504<br>
<br>
Direct:
616.450.8653<br>
<a
moz-do-not-send="true"
href="mailto:jim@buildingperformanceteam.com" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:jim@buildingperformanceteam.com">jim@buildingperformanceteam.com</a></a><br>
<br>
<a
moz-do-not-send="true"
href="http://buildingperformanceteamcom" target="_blank">Website </a>l
<a
moz-do-not-send="true"
href="https://www.linkedin.com/pub/jim-dirkes/7/444/413" target="_blank">LinkedIn</a>
<p
style="margin-bottom:0in;margin-bottom:.0001pt;text-align:center"
align="center"><b><i><span
style="font-size:14.0pt;line-height:115%;font-family:"MS
Reference Sans
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<p
style="vertical-align:middle">
</p>
<p
style="margin-bottom:6.0pt;text-autospace:none"><span
style="font-family:Calibri,sans-serif"><font size="4">Fail
faster!</font></span><br>
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