[Bldg-sim] MODELLING THERMAL BRDIGES IN e-quest or DOE2
Joe Huang
yjhuang at whiteboxtechnologies.com
Fri Jan 29 02:41:05 PST 2016
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.
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.
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
bridging. I compared the wall assembly U-values to that calculated by
ORNL's Heating-7 program, and they were
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.
For more information on this technique, i.e., creating 2-D response
factors, please see this report:
http://www.whiteboxtechnologies.com/PAPERS/96_12_YJH_2Drespfacs_CEC_rpt.pdf
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.
Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
On 1/28/2016 1:22 PM, Jim Dirkes wrote:
> 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.
>
> On Thu, Jan 28, 2016 at 4:11 PM, Marcus Sheffer
> <sheffer at sevengroup.com <mailto:sheffer at sevengroup.com>> wrote:
>
> Follow the guidance in ASHRAE 90.1 Appendix A to determine the
> whole assembly values.
>
> Marcus Sheffer
> 7group
>
> -----Original Message-----
> From: Jones, Christopher [mailto:Christopher.r.Jones at wspgroup.com
> <mailto:Christopher.r.Jones at wspgroup.com>]
> Sent: Thursday, January 28, 2016 8:30 AM
> To: Luis Peréz-Lombard; bldg-sim at lists.onebuilding.org
> <mailto:bldg-sim at lists.onebuilding.org>
> Subject: Re: [Bldg-sim] MODELLING THERMAL BRDIGES IN e-quest or DOE2
>
> Hello Sir,
> 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:
> https://www.bchydro.com/powersmart/business/programs/new-construction.html#thermal
>
>
>
>
> Christopher Jones, P.Eng.
> Senior Engineer
>
> WSP Canada Inc.
> 2300 Yonge Street, Suite 2300
> Toronto, ON M4P 1E4
> T +1 416-644-4226 <tel:%2B1%20416-644-4226>
> F +1 416-487-9766 <tel:%2B1%20416-487-9766>
> C +1 416-697-0056 <tel:%2B1%20416-697-0056>
>
> www.wspgroup.com <http://www.wspgroup.com>
>
> -----Original Message-----
> From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org
> <mailto:bldg-sim-bounces at lists.onebuilding.org>] On Behalf Of Luis
> Peréz-Lombard
> Sent: Thursday, January 28, 2016 4:08 AM
> To: bldg-sim at lists.onebuilding.org
> <mailto:bldg-sim at lists.onebuilding.org>
> Subject: [Bldg-sim] MODELLING THERMAL BRDIGES IN e-quest or DOE2
>
> Dear building simulation colleagues,
> I would very much appreciate any insights or work around to
> simulate envelope thermal bridges in e-quest.
> Sincerely,
> LPL
> -------------------------------------------------------------
> Luis Pérez-Lombard
> Dr. Ingeniero Industrial
> Profesor Contratado Doctor
> Departamento de Ingeniería Energética
> Escuela Superior de Ingenieros
> Universidad de Sevilla
> Camino de los Descubrimientos s/n
> 41092 SEVILLA
> Tfno.: 95.448.72.56
> Fax: 95.446.31.53
> e-mail: lpl at us.es <mailto:lpl at us.es>
> -------------------------------------------------------------
>
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> --
>
> James V Dirkes II, PE, BEMP, LEED AP
> CEO/President
> The Building Performance Team Inc.
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>
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