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

[dec07001]

Dear Mr. Bradley

Thanks for your answer.
Since I do not have values for the GRDREF what do you advise to use.
Best regards
Eunice




Em 03.05.2012 16:12, David BRADLEY escreveu:
> 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
>>
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>>
>
> --
> ***************************
> 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