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Can you NOT input a visible transmittance in OS App?

For a WindowMaterial:SimpleGlazing, the field visible transmittance is optional.

From the documentation:

This field is optional. If it is omitted, then the visible transmittance properties are taken from the solar properties. If it is included then the model includes it when developing properties for the glazing system. This is the rated (NFRC) value for visible transmittance at normal incidence.

I want this field to actually be calculated by EnergyPlus based on the solar data and not defaulted to 0.31.

Is there a way to NOT input a VT value in the Openstudio App or do I have to call resetVisibleTransmittance on the window using the api?

Julien Marrec's avatar
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Julien Marrec
asked 2016-02-03 10:24:10 -0500
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Visible transmittance is an optional value for the OS SimpleGlazingSystem material, too. When I create one of these from scratch in the OSapp, the VT field is blank. If I leave it alone, the material definition in the saved osm does not have this field. Are you seeing different behavior, Julien?

rpg777's avatar
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rpg777
answered 2016-02-03 11:07:46 -0500
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No, you're right, it's blank when you create from scratch. But there's no way to go back once you've set a value. I wanted to reset the VT for a SimpleGlazing that came from one of the OS templates and couldn't do it.

Julien Marrec's avatar Julien Marrec (2016-02-03 11:15:33 -0500) edit
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Ah. Well yeah in that case (if the field is already present), you'll have to blow it outta there with that call.

rpg777's avatar rpg777 (2016-02-03 11:38:14 -0500) edit
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