[TRNSYS-users] Unknown TRNSYS component

[David BRADLEY]

Younness,
   I think it might be Type93, a component that takes an input and holds 
it for one or more time steps (in fact by however many time steps the 
user indicated using a parameter) and then "releases" the input as an 
output. It can help to stabilize a simulation that has convergence 
problems by building back in some of the time delays that get 
"simplified out" when we write mathematical models of physical 
processes. For example, in building models and thermal storage models, 
we assume that mixing of an inlet air or water stream into the zone or 
tank node occurs instantaneously and that thermostats sense the change 
instantaneously. In reality, the mixing and sensing both take some 
finite time. Adding the Type93 "input delay" is an effective way of 
building the finite time for mixing back in. You should take a lot of 
care in using it because it is quite easy to stick them all over a 
simulation and force the system to converge when in fact there are other 
problems that should be addressed. I would recommend only using the Type 
if you are using a small timestep such as 1 or 5 minutes.
Kind regards,
  David


On 11/16/2011 09:18, youness EL FOUIH wrote:
> Dear all,
> I don't know what this TRNSYS component is (see attached pic), and I 
> whould be gratefull for any one who can explain to me how it works.
>
> Thank you all.
>
>
> -- 
> *EL Fouih Younness
> *Ingénieur Process - ENIM - Rabat- Promo 2010
> Master Stratégies Énergétiques - Mines Paristech - Paris
> Tel : +33 6 48 81 01 13
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

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