reflection and absorption

[Anonymous]

Hello,

I would like to calculate the difference between a white surface wall surface and the same kind of wall but with brown outer surface. I would like to know the reflection and absorption indices and then calculate the surface temperature of the wall in the two solutions at the same temperature as the outside air temperature. How could I proceed?

Thank you in advance.

[Jon.Wilde]

Have you looked into the manufacturers details for the paint to see if they provide these figures? If they do, you should be able to assign them in CFD.

Actually there are three values, emissivity, transmissivity and reflectivity. The latter is not displayed but all need to sum to 1 🙂

Hope that helps,

Jon