[TRNSYS-users] Modelling- Building

[David BRADLEY]

Prof Taherian,
   Check the assumption that has been made about the boundary 
temperature beneath the floor of the building. Leaving that value set to 
its default 0C is a common cause of the results you are seeing. Leaving 
an input unconnected means that the value of that input is assumed to be 
constant throughout the simulation. The value will be taken from the 
initial value provided. There are numerous methods and models for 
setting the boundary temperature beneath a slab as a function of time. 
As a very first rough approximation you can set it to the average annual 
air temperature of the building's location.
best,
  David


On 07/07/2015 10:09, Hessam Taherian wrote:
>
> Hi David,
>
> We are modeling a 3D building with external chiller and cooling coil. 
> The problem we have is that even with gains in the zones, the airnode 
> temperatures are lower than the ambient temperature. The cooling 
> effect (through ventilation) is almost zero yet the zone temperatures 
> are low. That has puzzled us as to how is that possible.
>
> Could you point me in the right direction?
>
> Thanks
>
> Hessam Taherian 
> <http://www.uab.edu/engineering/home/departments-research/me/people/101-hessam-taherian>, 
> PhD
>
> Assistant Professor, and Thermal Fluid Systems Lab coordinator
>
> SBA member ASHRAE, Member ASES, IBPSA-USA
>
> Department of Mechanical Engineering
>
> University of Alabama at Birmingham
>
> Mailing address:
>
> 1720 Second Ave. S
>
> BEC 257
>
> Birmingham, AL 35294-4461
>
> Email: taherian at uab.edu <mailto:taherian at uab.edu>
>
> Office phone: (205) 934-8461
>
> Lab phone: (205) 975-6706
>
> http://scholar.google.com/citations?hl=en&user=UkA8HIgAAAAJ&view_op=list_works
>
> Go Blazers!! DragonHead_sm.gif
>
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>
>
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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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