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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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