[Bldg-sim] MODELLING THERMAL BRDIGES IN e-quest or DOE2 (minor correction on dates).
Joe Huang
yjhuang at whiteboxtechnologies.com
Fri Jan 29 02:43:49 PST 2016
The work I did for the CEC was done in 1996 (as indicated in the report
title), not 2000-2002, which was a follow-on effort to do 2-D foundation
heat flows.
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 1/29/2016 2:41 AM, Joe Huang wrote:
> 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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>> *//*
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