[TRNSYS-users] trnsys 17 do not achieve the same results of trnsys 15 ?

[David BRADLEY]

Eunice,
  I would not expect to obtain the same results from a Trnsys15 and 
Trnsys17 simulation; we are continually trying to improve on the models 
and to incorporate new algorithms so as to keep on top of best modeling 
practices. In your email, you point out one possible explanation for the 
difference in that the Trnsys17 building model considers radiation 
exchange not only between the building walls and the sky but also now 
between building walls and the ground.
Kind regards,
  david


On 5/3/2012 07:55, dec07001 wrote:
> Dear all
>
> I used trnsys 15 to simulate de heating and cooling needs of a 8 zone 
> building (2 zones/ 4 levels) and now a I am using trnsys 17 and not 
> achieving the same results for the exact same building (it varies from 
> 5 to 20% more demanding) is this possible?
>
> Conditions considered:
> 1-exactly the same constructive solution and windows
> 2-exactly the same simulation components (types:9, 16i, 69b ,33e, 56 
> and 25)
> 3-for 4 the new inputs in type 56:
> type 16i provide the AZEN and AAZM
> the TSGRD considered equal to TAMB
> and GRDREF left to link
> 4-the heating and cooling needs previously obtained in the demands 
> file of the trnsys 15, are now beenig obtain (trnsys 17) with the 
> NTypes 1, 30 and 31.
>
> All help will be appreciated, thanks
> Eunice Fontao
>
> _______________________________________________
> 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