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