[TRNSYS-users] Capacitance in TRNBuild

[David BRADLEY]

Ole,
  To add to what Jean Marais said, by including the wall capacitance in 
the zone and making only resistive walls you are turning Type56 into 
something resembling a lumped capacitance model and are no longer taking 
advantage of there being any difference between the air temperature and 
the surface temperatures. If that is the kind of model that you want to 
use then there are some actual lumped capacitance building models either 
as a single zone model the standard library (Type88) or as a multizone 
model in the TESS Loads and Structures library (Types 759 and 660)
best,
  David



On 2/22/2015 06:01, Ole Nienaber wrote:
> Dear all,
>
> I'm trying to model a building zone in TRNBuild. The store capacity is 
> specified by 90 Wh/(m²*K). Unfortunately there is no information about 
> the single store capacities (e.g. walls, furniture,...). Now my idea 
> was to just model the zone with massless walls and to add the whole 
> store capacity to the capacity in TRNBuild (normally the wall capacity 
> is not valued in this parameter). Normally I don't see any problems 
> regarding to this way of calculation, becauce I only use the absolute 
> value of the capacity. Do you see any problems in doing this?
>
> Thanks and greets,
> Ole
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

-- 
***************************
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