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Hi TRNSYS Users,
I am using the Type 15-2 for reading weather data in the tm2 format. From the beginning of a multizone building project there was this usefull TURN function, which rotates the azimuth angle from the Sun. So I could made my Type 56 Building hard South, West, East, Nord and turn it later in the simulation Studio.
Now I needed to switch to the Type 15-10 for reading TRY weather data. In the Type 15-10, I have to specify again the slope and the azimuth for each surface. I just made everything the same as in the Type 15-2, but then I realized, that in the Type 15-2 the azimuth angles are no numeric Values. These Values are Parameters as an example "AA_N_135_90" (azimuth angle nord 135 slope 90). And these Parameters are calculated in the turn function.
The Problem is, in the new Type 15-10 I can not insert parameters like "AA_N_135_90", just numeric Values. And I also can not link the Turn-function to the Type 15-10, because these Type doesn't allow input parameters.
In the attached files are screenshots from the parameter window of both types.
Does someone knows, how to set Values as a Parameter, which is defined in an other equation?
Cheers, Leopold
Change the Units of the azimuth in your new Type15-10 from "degrees" to "variable name" (should be the last item in the dropdown list - if you're using an older version of TRNSYS, it might be called "string"). You should then be able to use the variable name "AA_N_135_90" to set the azimuth in the new proforma.
~A. Weiss
DavidBradley 13/06/2025 1:19 pm
In addition, bear in mind that even if the value of the equation that sets the azimuth changes during the simulation the azimuth angle of the surface defined in Type15 will not change. Because it is a PARAMETER and not an INPUT, the azimuth will remain equal to the initial value of that equation throughout the simulation.
If your surface does change orientation during the simulation (perhaps it is a photovoltaic panel that tracks the sun) then there are some automatic tracking modes set up in Type15 from which you can choose. If your surface changes orientation in some other way - perhaps you are modeling a ship) then you can use Type16 to compute the components of the solar radiation on your surfaces as that model allows the azimuth and slope of each surface to be an input (and thus change with time)
kind regards,
david
perfect. These answers are great!
Thank you very much for this information.
