Re: [EnergyPlus_Support] How to calculate walls and slabs' thermal properties?

["Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

You have the density of each layer, and the area and thickness (volume). So calculate the mass of each. Then you have the sum of the masses and the sum of the volumes, so work out the density of the assembly. Specific heat is mass based, so do a mass-weighted addition of the parts.

Jean

On 20 Jan 2016 3:17 pm, "hassan_kamel77@xxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Hello,

I wonder if anyone can give me an advice on how to calculate the thermal properties of a wall or a slab as one unit.

I have got the thermal conductivity, density and the specific heat capacity for each of the contents of the wall and the slab. Ex. building block, bitumen, cement cover, etc., separately ...

But the input for the Basement Preprocessor of the EnergyPlus, requires those properties for the wall as one unit.

Is it just simply the Sum. of its contents, as we do for the R-value? or we need a special formula for each ?

Thanks in advance,

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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>

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