.IDEAS.Buildings.Data.Interfaces.Glazing

Information

The Glazing.mo partial describes the material data required for glazing construction modelling.

The correct parameter values for your type of glazing can be generated using the Window software from LBNL. In the software open the "glazing system" library. On this page choose the number of layers (typical two or three) and fill in the glazing types. Make sure to "flip" the glass sheet when necessary so that the coating is on the correct side of the glass. Press calc to calculate the parameters.

The resulting parameters can be filled in as follows.

In result tab "Center of Glass Results" copy Ufactor to U_value. In result tab "Angular data" open "Angular data". Fill in the values of Tsol (0-90 degrees) in SwTrans. The last value (Hemis) is filled in under SwTransDif. Fill in the values under Abs1, Abs2, Abs3 in into SwAbs and SwAbsDif in a similar fashion. Parameter g_value does not need to be filled in.

Furthermore, it is important that the epsLw_b or epsLw_a fields of the glazing layers are adjusted to reflect the effect of the glazing coating, assuming it exists. This makes the difference of a U value of about 3 W/mK or 1 W/mK for double glazing! See IDEAS.Buildings.Data.Glazing.Ins2Ar for an example with double glazing that has 1 glazed sheet with a coating on the inside.

When no coatings are detected, ie. when the emissivities are default, an error is thrown to inform the user that he/she is probably unintentionally simulating low performance glazing. The error can be disabled with the parameter checkLowPerformanceGlazing.

Validation

To verify the U-value of your glazing system implementation, see IDEAS.Buildings.Components.Validations.WindowEN673

Revisions

• September 9, 2019, by Kristoff Six:
  Updated with errorLowPerformance for issue #1038.
• November 27, 2018, by Filip Jorissen:
  Revised documentation for issue #959.