Emissivity duct material

The values are band-averaged infrared emissivities, recommended default plus a short plausible range appropriate for typical finishes (unpainted, as-built surfaces).

Note that surface finish, oxidation, painting, temperature and wavelength can change emissivity significantly.

Symbol
$\epsilon_{d}$
Related
Choices
MaterialValueRange
PE0.90.85 - 0.95
PP0.970.90 - 0.97
PVC0.940.90 - 0.97
Metal0.810.60 - 0.90
Fibre0.920.88 - 0.95
Earth0.910.88 - 0.94
Cem0.930.85 - 0.96