I need to define a dual duct VAV system in OpenStudio (v1.5). I just realized that it is not supported yet, and from the HVAC roadmap, it has a second priority to be implemented. My question is: is there a workaround to define this anyway in OpenStudio in order to stay in OpenStudio (and to be able to use PAT)? We cannot go to EnergyPlus because then we cannot use the PAT.