I have a model that I applied the "NZEHVAC" BCL measure to in order to add a VRF w/ DOAS system. I want to determine the seasonal average heating and cooling COPs of the system as a whole, as well as the VRF system only. What is the easiest way to do this in OpenStudio?
For the VRF, add the output variables:
To include the DOAS, add in:
You can add these with the Add Output Variable measure or the Add Output Variables from csv measure. View them in Dview to get monthly and annual averages in the statistics page. You'll need to calculate the DOAS coil COP as Cooling or Heating energy / Electric Energy.
@mdahlhausen Thanks for the quick response. Using those coil output variables is exactly what I usually do for other HVAC system types, however, when I use those with the VRF system I end up getting a heating COP below 1, which makes no sense for an electric heating system. There are only 400 unmet heating hours in my model, so it isn't that the system fails to meet the heating demand most of the time.
Seems like something is incorrect in the measure or the model. can you link to it?
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