I want to change the DesignDay objects in a model through an OpenStudio measure. Changing it will allow me to change the design day in the PAT.
I found the action performed when you click the Import DDY button, it seems like there is some well-worked logic to importing it and I think that using this method would be the best approach. Is there any way in the current SDK to access it?
Here's how you would load DDY file, and try to limit yourself to the two most common design days:
if !OpenStudio::exists(ddy_path)
raise "Path doesn't exist: #{ddy_path}"
end
ddy_idf = OpenStudio::IdfFile::load(ddy_path, "EnergyPlus".to_IddFileType).get
ddy_workspace = OpenStudio::Workspace.new(ddy_idf)
reverse_translator = OpenStudio::EnergyPlus::ReverseTranslator.new()
ddy_model = reverse_translator.translateWorkspace(ddy_workspace)
# Try to limit to the two main design days
ddy_objects = ddy_model.getDesignDays().select { |d| d.name.get.include?('.4% Condns DB') || d.name.get.include?('99.6% Condns DB') }
# Otherwise, get all .4% and 99.6%
if ddy_objects.size < 2
ddy_objects = ddy_model.getDesignDays().select { |d| d.name.get.include?('.4%') || d.name.get.include?('99.6%') }
end
#add the objects in the ddy file to the model
model.addObjects(ddy_objects)
This is loosely adapted from what we do in OpenStudio-resources, where we look at the workflow.osw to find the EPW name and load the matching DDY file next to it. See code here
Change Building Location measure would be a good place to start. It not only sets up EPW and ASHRAE climate zone, but imports design days. You can also directly edit existing design day objects in a model or make new design day objects from scratch instead of importing from ddy files. Here is a link to the documentation for DesignDay object.
Asked: 2019-10-02 10:18:58 -0600
Seen: 1,128 times
Last updated: Oct 04 '19
