Decoupled Cooling With Economizer Option OpenStudio
I would like to test a building option which uses chilled beams, but when the OA temperature is less than 55F it uses air cooling. I have a version of the model which VAV reheat, and a chilled beam version with min OA DOAS. But I am looking for a way to control the VAV serving the chilled beam zones to only air cool when the air-handler is in economizer mode. I can't seem to find a way to do this. Basically I want the VAV to provide minimum flow when OA is above 55F and cooling flow when below 55F. Can anyone suggest something for this?
have you tried setting zone equipment priority? You could specify chilled beams first, so they take priority in cooling, and then have a controller that shuts off water to chilled beams below 55F. Otherwise you could use EMS for the VAV controller.