[TRNSYS-users] Ambient temperature

[David BRADLEY]

Mihai,
   Type109 was found to have a number of issues and so was rewritten 
with the release of Trnsys17. If you are using a later version of 
Trnsys16, you might may have access to either Type933 or Type15 and I 
would highly recommend that you change to using one of these in place of 
Type109 since you are reading from a *.tm2 file. Type933 and Type15 are 
the same Type but were released at different times.
Kind regards,
  David


On 12/19/2014 04:49, Mihai T. wrote:
> Hello!
>
> I made a simulation in Trnsys to evaluate the heating demand for a 
> office building. Now I need to compare the trnsys results with some 
> results obtained using another method.
>
> Please help me to find how TYPE 109 calculates „Ambient temperature” 
> and how the correspondence with the solar radiation values at the 
> correct time moments is ensured. I am asking you this because the 
> ambient temperature used in simulation is not the same with ambient 
> temperature from the weather data file (dry bulb temperature in the 
> file '...\Trnsys16\Weather\Meteonorm\Europe\RO-Bucuresti-154200.tm2'). 
> I cannot find this information in Trnsys Manual.
>
> The problem found is that, if a shift is made (with 1/2h) to the dry 
> bulb temperature (by averaging two values at 2 consecutive time 
> moments in order to place the average values in the middle of the hour 
> and to match the moment considered for solar calculations), the result 
> is a mismatch between ambient temperature and solar radiation values 
> (with 1 h difference).
> I have performed the solar calculation using Perez model and I have 
> found the same values as the ones calculated in trnsys, but with 1 
> hour shift (to have a correct match between temperatures and radiation 
> the latter should be moved forward with 1 hour).
>
> Please advise and give me some explanations on the calculation 
> procedure used in trnsys.
>
> Thank you for your support,
> Mihai Toderașc
>
>
>
>
>
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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

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