Average Transmittance Factors for Multiple Glazed Window Systems

Publication Type

Conference Paper

LBNL Report Number



Multiple glazing is the most common static method of improving the insulating properties of windows. For simplified calculations of solar heat gain a single value for transmittance is chosen, usually the normal transmittance. Whenever such a method is applied, the normal transmittance should be replaced by an averaged value which takes into account the daily and seasonal variations of weather and the angle of incidence.

Conference Name

4th National Passive Solar Conference

Year of Publication


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