Re: [EnergyPlus_Support] questions on zone geometry

[Rahul Chillar <chillarrahul@xxxxxxxxx>]

Hello
 
Regarding 2 , i feel one good way of overcoming the problem is to define NEW material say AIRONLY in the Materials Field and specifing the properties/Thickness of the air in the required section as below
    MATERIAL:REGULAR,
    AIRONLY,                 !- Name
    VerySmooth,              !- Roughness
     .3,                  !- Thickness {m}  Give the Required Thickness of air needed here
     .0267,                  !- Conductivity {W/m-K}
     1.177,                  !- Density {kg/m3}
     1000,                   !- Specific Heat {J/kg-K}
    0.9,                     !- Absorptance:Thermal
    0.7,                     !- Absorptance:Solar
    0.7;                     !- Absorptance:Visible
the bold values are correct for 30 Deg C.
Construction,
   Roof1, ! Name
   METAL - GALVANIZED STEEL , !- outside layer
   E4 - CEILING AIRSPACE,
   AIRONLY,
   WOOD - SOFTWOOD 3 / 4 IN; ! Inside layer

regarding 1:  If you specify no thickness the program wont work so specify a small value if the need arises.
 
Thanks
Rahul Chillar
Grad Research Assistant
Building Systems Lab
UIUC


teklay Weldeabzgi <teklay1979@xxxxxxxxx> wrote:
i have some some questions on surface geometry

1. is there any problem to neglect the thickness of
the surface example thickness of walls in the
simulation result?

2. in my country the construction of is basically
corregated iron sheet on the top and a chip(soft) wood
ceiling material. of course there is a  wooden or
steel truss structure which holdes the roof top.
what i have confused here is that when i take the
construction in my simulation for this roof is as
follows,
Construction,
   Roof1, ! Name
   METAL - GALVANIZED STEEL , !- outside layer
   E4 - CEILING AIRSPACE,
   WOOD - SOFTWOOD 3 / 4 IN; ! Inside layer
but i don't feel comfort with this b/c the air gap is
very large so that the thickness of the air gap is
very important. so how do i consider this thickness os
air?

thanks
tek


      
            
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Thanks 
Rahul Chillar 
Grad Student 
Building Systems lab
Univ Of Illinois Urbana Champaign

		
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