17-1199

solar factor (of glazing material) [g]

ratio of the quantity of heat penetrating into an interior through the glazing, to the solar radiant energy incident on that glazing

Unit: 1

Equivalent term: "total (energy) transmittance"

NOTE This ratio is the sum of 2 quantities: the radiant transmittance, τe, of the glazing and the quantity equal to the ratio of the convected and radiated heat gain from the glazing into the interior, Q2, to the solar radiant energy, Q1, incident on the glazing:

g = τe + Q2 / Q1.

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