[EnergyPlus_Support] Properties of roof sheets

["agasgroth" <agas@xxxxxxx>]

Could someone clear up the different thermal properties of roof 
sheets.
I have data from a McGraw-Hill book with a chart indicating the 
following for new galvanised sheet:

Solar reflectance 0.35
Solar absorbtance (inverse of refl.) 0.65
Far IR emissivity 0.15-0.23
Far IR reflectance (inverse of emissivity) 0.77--.85

BLASTMaterials.IDF (included in E+ DataSets directory) has the 
following:

 MATERIAL:Regular,METAL - GALVANIZED STEEL 1 / 16 IN,  !- Material 
Name
 Smooth,  !- Roughness
  1.6000000E-03,  !- Thickness {m}
   45.31000    ,   !- Conductivity {w/m-K}
   7833.020    ,   !- Density {kg/m3}
   500.0000    ,   !- Specific Heat {J/kg-K}
  0.9000000    ,   !- Thermal Emittance
  0.2300000    ,   !- Solar Absorptance
  0.2300000    ;   !- Visible Absorptance

This seems to be quite different. What are the correct figures to use?

What are the relevant figures for different coloured painted steel 
corrugated roof sheets, e.g. white, light green ?

regards,



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