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[EnergyPlus_Support] wall and roof color




 hello ever body i need some help on these questions
1. how does E+ considers the effect of wall and roof
color in cooling load. i know that color has a
considerable effect on cooling load of a building but
i can't understand how to take this effect in E+.

2. i have some doubt with material properties given in
the dataset of E+. especially on the thermal
emittance, solar Absorptance, and Solar Absorptance.
for example if u see the following three materials i
think they sould have the same property but it differs
greatly. 

     MATERIAL:Regular,CONCRETE - 3/4 IN MORTAR,  !-
Material Name
 Rough,  !- Roughness
  1.0000000E-02,  !- Thickness {m}
  0.7200000    ,   !- Conductivity {w/m-K}
   1858.140    ,   !- Density {kg/m3}
   830.0000    ,   !- Specific Heat {J/kg-K}
  0.9000000    ,   !- Thermal Emittance
  0.2000000    ,   !- Solar Absorptance
  0.2000000    ;   !- Visible Absorptance

  MATERIAL:Regular,PLASTER - CEMENT SA 3 / 4 IN,  !-
Material Name
 Smooth,  !- Roughness
  9.9999998E-03,  !- Thickness {m}
  0.7200000    ,   !- Conductivity {w/m-K}
   1858.140    ,   !- Density {kg/m3}
   830.0000    ,   !- Specific Heat {J/kg-K}
  0.9000000    ,   !- Thermal Emittance
  0.7800000    ,   !- Solar Absorptance
  0.7800000    ;   !- Visible Absorptance

 MATERIAL:Regular,A1 - 1 IN STUCCO,  !- Material Name
 Smooth,  !- Roughness
  2.0000000E-02,  !- Thickness {m}
  0.6900000    ,   !- Conductivity {w/m-K}
   1858.140    ,   !- Density {kg/m3}
   830.0000    ,   !- Specific Heat {J/kg-K}
  0.9000000    ,   !- Thermal Emittance
  0.9200000    ,   !- Solar Absorptance
  0.9200000    ;   !- Visible Absorptance

  MATERIAL:Regular,CONCRETE - 3 / 4 IN STUCCO,  !-    
                                   Material Name
 VeryRough,  !- Roughness
  9.9999998E-03,  !- Thickness {m}
  0.7100000    ,   !- Conductivity {w/m-K}
   1874.160    ,   !- Density {kg/m3}
   830.0000    ,   !- Specific Heat {J/kg-K}
  0.9000000    ,   !- Thermal Emittance
  0.7200000    ,   !- Solar Absorptance
  0.7200000    ;   !- Visible Absorptance

 why is this happen ?  if these properties are not the
exact value can u help me how to get the exact value.
 you can imagin that these properties varies the
cooling load greatly.

tahnks
tek



		
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