[TRNSYS-users] information about Tape 557 Transys

[chiassad at notes.udayton.edu]

The use of the “Number of simulation years” is briefly explained in the 
Simulation Studio under the "More" tab. It is my understanding that this 
parameter is used to internally generate an appropriate mesh size and 
extent for the finite difference calculations. So, depending on the years 
of your simulation, heat fluxes will propagate from the center of the grid 
to the edges, and temperatures may build up (or deplete) incorrectly at 
the grid boundaries if the overall finite difference grid size is not 
large enough. In short, the Duct Storage Model uses this value of “Number 
of simulation years” to properly size the finite difference grid. 

Hope this helps.

Andrew Chiasson
University of Dayton
Department of Mechanical and Aerospace Engineering / Renewable and Clean 
Energy
300 College Park Dr. 
Kettering Labs, Room 361
Dayton, OH 45469-0238
937-229-2892 (W)
937-229-4766 (Fax)

"Francois Badinier" <francois.badinier at icax.co.uk> wrote on 02/02/2010 
05:42:26 AM:

> "Francois Badinier" <francois.badinier at icax.co.uk> 
> 02/02/2010 05:47 AM
> 
> To
> 
> "'Nicola Sorbi Unipg'" <nicolasorbi at mach.ing.unipg.it>, 
> <Goran.Hellstrom at matfys.lth.se>, "'TRNSYS ALL USER'" <trnsys-
> users at engr.wisc.edu>, <transsolar at transsolar.com>
> 
> cc
> 
> Subject
> 
> Re: [TRNSYS-users] information about Tape 557 Transys
> 
> Hi Nicola
> 
> Your question is interesting, as I am a regular user of this Type, 
> and I noticed that changing the value of this parameter has barely 
> no influence on the simulation, i.e. even if you are simulating over
> a 10-year period, entering 1 or 10 seem to make no difference at all. 
> This is what I noticed, and I take your question further to the 
> “experts” of this type, “Is it meant to have an influence on the 
simulation”?
> 
> Kind regards,
> 
> François Badinier
> Development Engineer
> ICAX Ltd
> 1 Hatfield House 
> Baltic Street West
> London EC1Y OST
> francois.badinier at icax.co.uk
> www.icax.co.uk
> 
> 
> 
> From: Nicola Sorbi Unipg [mailto:nicolasorbi at mach.ing.unipg.it] 
> Sent: 02 February 2010 09:44
> To: Goran.Hellstrom at matfys.lth.se; TRNSYS ALL USER; 
transsolar at transsolar.com
> Subject: [TRNSYS-users] information about Tape 557 Transys
> 
> 
> Dear professor, I’m a PhD working in Perugia University.
> I’m using Trnsys to simulate a GHP system. I’m using the Tape 557 
> “Duct Ground Heat Storage Model”. I need to know the meaning of the 
> parameter “Number of simulation years”.
> If I use a value of 10 year and I print the values of ground 
> temperature simulated using TRNSYS16 (using 8760 hours of simulation
> in Transys), does the software give the temperature after 10 years 
> of simulation?
> Waiting your reply,
> Best regards.
> Nicola 
> 
> 
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> [image removed] 
>                     Dott. Ing. Nicola Sorbi
> 
>           UNIVERSITA' DEGLI STUDI DI PERUGIA
>            Dipartimento di Ingegneria Industriale
>            Via G. Duranti 1A/4 - 06125 Perugia
>            Tel. +39 075/5853930 - Fax. +39 075/5853736 
>            E-mail nicolasorbi at mach.ing.unipg.it
> [image removed] 
> 
> 
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> 02/01/10 12:37:00_______________________________________________
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