Defining curtain walls

In the building element libraries, "Curtain wall" elements let you simulate glazed openings by entering data for both the glazed fraction and, optionally, the opaque fraction:

• Reference
  Curtain wall type reference.
• "Glazed fraction" tab
  • Heat transfer coefficient (U)
    The thermal transmittance value of the glazed section.
  • Solar heat gain coefficient
• "Opaque fraction" tab (optional)
  • Heat transfer coefficient (U)
    The heat transfer coefficient value of the opaque portion.
  • Opening opaque fraction
    This parameter lets you define the proportion of opaque elements covering the total surface area of the curtain wall, as a ratio.
  • Absorptance
• Air leakage rate for a reference pressure of 100 Pa (in the "Energy simulation" project type)

The options on the right can be used to "Import" and "Export" these settings to .bib687 files on your hard drive.