Re: [TRNSYS-users] Modeling a double skin facade

Hi Adrien,

To model the airflow in the skin, you do need a separate zone in TRNBUILD indeed. Preferably a number of zones, in order to get a vertical gradient in temperature.

To model natural convection there a two possibilities that I know of:

- buy the TRNFLOW- plugin for TRNSYS, and TRNFLOW will calculate the natural convection for you

- model the convection yourself, which is quite straightforward: calculate the temperature in the skin by TRNSYS, calculate the density/pressure difference in the skin using an equation-type, and calculate the induced flow by assuming the skin is a very large (rectangular) duct. The calculated flow can now be used as an input for a ventilation-type in TRNBUILD.

regards,

Arie

Van: trnsys-users-bounces@engr.wisc.edu [mailto:trnsys-users-bounces@engr.wisc.edu] Namens jezequel adrien
Verzonden: donderdag 14 december 2006 16:23
Aan: trnsys-users@engr.wisc.edu
Onderwerp: [TRNSYS-users] Modeling a double skin facade

Hi users,

I am a recent TRNSYS user, and I need some help to model a double skin facade.

An old concrete building is partially covered by a glass "skin". The distance between the skin and the old facade is around 1.5 m. I have describe the building with TRNBUILD, but I don't know how I can do to model the air zone between the glass skin and the concrete face. The skin begins at the first floor (and is opened to air). It stops 1.2 m above the last level. The skin doesn't recover totally the building (The last floor is boundary to external).

I have tried to put the air zone in a particular zone in TRNBUILD, but I'd like to take into acount natural convection in the gap, to model air flow in the skin.

Thanks for jour help.

Adrien

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