[TRNSYS-users] model a staircase in a double storey house

[David BRADLEY]

PJ,

   The way that a staircase affects heat transfer in a building is 
primarily through convection (air moving up and down the stair). If the 
staircase in your house is closed off then you can best model it as an 
airnode of its own that spans both floors of the house. If the staircase 
is open then it becomes a bit more tricky. The most correct way to 
approach it (in my opinion) is to add an internal air flow model to your 
building model (using either TRNFlow or CONTAM/Type97 or Type98). You 
can then define a horizontal opening and the air flow model will try to 
compute the amount of air that flows up or down through the stairway.

  If you don't want to introduce the level of complexity of interzonal 
airflow to the model then I would suggest putting a (fake) floor in the 
middle of the stairway in Trnsys3d. Once you get to TRNBuild you can 
define that fake floor as being a single resistive-only material with a 
very very low thermal resistance.

kind regards,

  David



On 05/17/2018 04:37, Pea Jy via TRNSYS-users wrote:
>
> Hi,
>
> I am a beginner in TRNSYS.
>
> Currently working on the thermal modeling of a double-storey house.
>
> I am using google sketchup to first classify the zone.
>
> My questions is, how do I model a staircase in sketchup? And how do I 
> define it after export it to trnbld?
>
> Thanks.
>
> Best Regards,
>
> PJ
>
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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