[TRNSYS-users] Wall thickness in TRNBUILD

[David BRADLEY]

Volodymyr,

  This is a common issue with energy modeling tools and I don't think 
that there is a "right" answer. Typically I try to draw the building 
using the mid point of the walls. It means that the zone volumes will be 
a little on the big side and that the thermal loss area will be a little 
bit on the large side. For buildings with very thick walls, that can 
become a problem but there are challenges in creating transfer functions 
for thick walls anyway. Quite a long time ago I did a building using the 
inside dimensions and then again with the outside dimensions. Annually 
the energy use was nearly identical between the two; certainly it was 
well within the other uncertainties of the modeling assumptions.

kind regards,

  David


On 07/21/2022 05:02, Volodymyr Pobuta via TRNSYS-users wrote:
>
> Hello
>
> I am using TRNSYS for the simulation of multizone buildings. I have 
> made the CAD model on Sketch Up and I moved on to TRNBUILD to define 
> all the construction and window layers. My question is the following:
>
>   * The walls imported from Sketch Up do not have a thickness. I have
>     multiple adjacent areas, for whom I have defined the construction
>     layers as supposed, however, while reading the Multi-Zone Building
>     Tutorial, I have noticed that the program only calculates the
>     U-value for the layer. Since the equations will need the input
>     from the volume of the rooms, how can I be sure that the layers
>     are defined properly and that I have the correct volume in the room?
>
> Thank you for your time
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

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

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