Twozone apartment hydronic - Air temperature output

[Jaap-Neven]

Context

In the Twozone Apartment Hydronic testcase documentation (here), it is stated that the air temperature is outputted from the emulator for both day and night zone. When developing predictive controllers for this use-case, comfort bounds should be treated based on the operative temperature in a room, which is a weighed average of the air temperature and radiative temperature.

Looking at the emulator, it seems that only the air temperature is outputted from the MixedAir model, but not the radiative temperature.

Suggestion

Make an additional API output for the radiative temperature for both zones, and provide documentation on how to sum both temperatures to get the operative temperature.

@EttoreZ and @dhblum, I remember we had the discussion to hold off on changing this use-case until there were multiple issues that can be grouped (also related to #775 and #539 ). Feel free to share how you wish to proceed, I would be happy to help out.

[EttoreZ]

Hey @Jaap-Neven thank you for bringing this up. The buildings library by default does not include a measure for the operative temperature. To make the test case more conformant with other with a radiant system using IDEAS library we could implement the same equation calculating operating temperature, expose that to the API and use it for comfort calculation (this would be more consistent than having a user calculate it themselves). Now if you think you could help with this implementation, we can set up a meeting offline and discuss the best way to move forward (I also updated the test case to Modelica 4.0 in a separate issue and I do not want the models to diverge).