
565Passive Solar Heating, Cooling, and Daylighting
© 2008 Taylor & Francis Group, LLC
The transmittance for several at-sheet plastic materials used in skylight domes is pre-
sented in Table 9.9. To get the effective dome transmittance (T
D
) from the fat-plate transmit-
tance (T
F
) value [32], use
DF F
(9.32)
If a double-domed skylight is used, then the single-dome transmittances are combined as
follows [33]:
T
D
DD
=
−
12
(9.33)
If the diffuse and direct transmittances for solar radiation are available for the skylight
glazing material, it is possible to follow this procedure and determine diffuse and direct
dome t ...