RE: [EnergyPlus_Support] Thermal bridge

This method works if the thermal bridge is “repetive” on a wall (or roof,…) but it doesn’t be helpful if the thermal bridge is “occasional” for example a column inside a wall,… in this case my opinion is better to use a “door object”; if the thermal bridge is the intersection between building elements (as example floor + façade) with no “apparent” surface in my opinion it will be better to use a fictitious very small surface having the same thermal transmittance than the thermal bridge evaluated in a 2D calculation (Therm for example)

Josep Solé
URSA Insulation S.A- URALITA
European Sustainibility & Technical Manager
Móvil +34 606 42 32 14

www.ursa.es

www.ursainsulation.com

www.uralita.com

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De: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] En nombre de alaa kandil
Enviado el: sábado, 18 de julio de 2009 6:45
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Asunto: Re: [EnergyPlus_Support] Thermal bridge

Some thing I use to get actual U values is to define the construction into ee4 software. It is an interface for DOE2 and it allows you to define a frame then the thermal bridge is calculated and overall thermal properties are reported. The software is very easy, and you will need just 5 minutes to find out how to do that.

Cheers

Alaa Kandil
Email: aakandil@ucalgary.ca,alaak1974@yahoo.com
mailing address :304 Jackson PL, NW,Calgary,t3b2v3
Cell No.:+1-403-818-5447
Phone No.:+1-403-282-9497

--- On Fri, 7/17/09, Josh K <jeemang@gmail.com> wrote:

From: Josh K <jeemang@gmail.com>
Subject: Re: [EnergyPlus_Support] Thermal bridge
To: EnergyPlus_Support@yahoogroups.com
Date: Friday, July 17, 2009, 11:23 PM

Hi Thierno;

I don't believe it does -- this is something that you must take into account before entering the material properties. That is, you must first calculate a resultant thermal conductivity that takes into account thermal bridging, and then enter that value into EnergyPlus.

That said, there is a dataset available with the EnergyPlus installation ( CompositeWallConstr uctions.idf, located in the DataSets folder of the installation directory) that contains pre-made Material and Construction objects for a number of Constructions with thermal bridging.

Josh

On Wed, Jul 15, 2009 at 7:52 AM, DIALLO THIERNOWOURY <thiernowoury@ yahoo.fr> wrote:

Dear all energyplus users,

how EnergyPlus take in to account thermal bridges ?

Thanks in advance

Thierno

--
Josh Kjenner, EIT, LEED AP
Manasc Isaac Architects Ltd.
10225 100 Avenue :: Edmonton, AB T5J 0A1
780.429.3977

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