Re: [TRNSYS-users] information about Tape 557 Transys

[chiassad@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@icax.co.uk>
wrote on 02/02/2010 05:42:26 AM:

> "Francois Badinier" <francois.badinier@icax.co.uk>

> 02/02/2010 05:47 AM
> 
> To
> 
> "'Nicola Sorbi Unipg'" <nicolasorbi@mach.ing.unipg.it>,
> <Goran.Hellstrom@matfys.lth.se>, "'TRNSYS ALL USER'"
<trnsys-
> users@engr.wisc.edu>, <transsolar@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@icax.co.uk
> www.icax.co.uk
>  
>  
>  
> From: Nicola Sorbi Unipg [mailto:nicolasorbi@mach.ing.unipg.it]
> Sent: 02 February 2010 09:44
> To: Goran.Hellstrom@matfys.lth.se; TRNSYS ALL USER; transsolar@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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>              
      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@mach.ing.unipg.it
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