[TRNSYS-users] Variation of long-wave-emissivity?

[bdo at stb.rwth-aachen.de]

TRNSYS-users,

I have to design a room with an internal cladding of high reflective 
aluminium foil, that has a very low relative emissivity epsilon r.
How can I vary the radiative heat exchange? The definition of the wall 
type only contains the convective heat transfer coefficient and the 
short wave absorptance.

Thanks to all,

Bernd.