PPG Industries, Inc. - Glass Performance Calculator
PPG IdeaScapes

PPG Industries Performance Glass Calculator Calculated Center-of-Glass Thermal
and Optical Properties Based on NFRC 100-2001 Environmental Design Conditions

Details for Monolithic Glazing as Specified

    Glass Lite    1/4'' (6mm) Atlantica (Surface #1)

Calculated Thermal and Optical Properties

  Shading Coefficient
0.61
  Solar Heat Gain Coefficient
0.53
  U-Values (K-Values) Metric
(Kcal/hr/m/C)
Metric
(W/m/C)
English
(BTU/hr/ft/F)
    Winter Nighttime 4.98 5.79 1.02
    Summer Daytime 4.50 5.24 0.92
  Relative Heat Gain Metric (Kcal/hr/m)
366
Metric (W/m)
425
English (BTU/hr.ft)
135
  LSG (Light to Solar Gain Ratio)
1.26
  Transmittance (%)
    Visible 67
    Ultraviolet / Krochman Damage Weighted 16 / 30
    Total Solar Energy 34
  Reflectance (%)
    Visible (Out) 7
    Visible (In) 7
    Total Solar Energy (Out) 5
  Color Properties L* a* b*
    Transmittance 85.60 -10.79 4.38
    Reflectance 31.47 -3.33 0.34
While PPG believes this calculated performance data to be reasonably accurate, it may not precisely agree with similar performance data calculated using the LBL Window 5.2 program. PPG's published data is based on the LBL Window 5.2 program.
 
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