For semi-transparent glass, it is suggested to distinguish between an active and a passive thermal conductivity. Essentially, the latter is attached to the heat transfer through long-range photons most of which are both emitted and absorbed outside the glass volume, the former to the heat transfer through phonons and short-ranged photons which have an intense energy exchange with the glass.
Origin
Schott Glaswerke, Germany
Journal Title
Glastech Ber Glass Sci Technol 67 12 1994 335-342
Sector
General
Class
G 1183