[EnergyPlus_Support] wall and roof color

[teklay Weldeabzgi <teklay1979@xxxxxxxxx>]

 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



		
__________________________________
Do you Yahoo!?
Yahoo! Mail is new and improved - Check it out!
http://promotions.yahoo.com/new_mail


------------------------ Yahoo! Groups Sponsor --------------------~--> 
Yahoo! Domains - Claim yours for only $14.70
http://us.click.yahoo.com/Z1wmxD/DREIAA/yQLSAA/dkFolB/TM
--------------------------------------------------------------------~-> 

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/EnergyPlus_Support/

<*> To unsubscribe from this group, send an email to:
     EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/