Address redundant window shading inputs

[shorowit]

These redundant shading inputs can result in shading effects being double-counted:

• ExteriorShading/Type can be "solar film", but there is a separate WindowFilm element. Remove the element? Or is there a separate element because a WindowFilm can be on the interior, in which case the enumeration should be dropped, the ShadingCoefficient should be separate into summer vs winter, and there should be a Location element (interior vs exterior), similar to InsectScreens?
• ExteriorShading/Type can be "external overhangs" but there is a separate Overhangs element with physical inputs. Remove the enumeration (and allow Overhangs/Depth to be optional)? What about "awnings"?

[shorowit]

Discussion from 12/2/24 WG call.

Window film:

• WG generally favors removing "solar film" from ExteriorShading/Type and using the existing WindowFilm element
• Add Location element for interior/exterior?
• Add ability to specify low-e?

Overhangs:

• WG generally favors removing "external overhangs" from ExteriorShading/Type and using the existing Overhangs element
• Change Depth to be optional, so you can note the presence of overhangs without supplying details

Awnings:

• Options:
  • Remove from ExteriorShading/Type, add documentation that Overhangs should be used, add element(s) related to summer vs winter, or
  • Remove from ExteriorShading/Type and add new Awnings element
• Characterize summer vs winter operation for retractable awnings

Other:

• How to handle external shutters for shading? New ExteriorShading/Type choice?