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Re: [EnergyPlus_Support] Windows
Following are the coefficients used in EnergyPlus to calculate a gas
property (conductivity, viscosity, or heat capacity) as a function of
temperature (in degrees Kelvin) according to the equation:
Property = Coefficient_A + Coefficient_B * T(K)
For example, Conducitivity of Air = 2.873e-3 + 7.760e-5*T(K).
These coefficients are internal to EnergyPlus.
The molecular weight of the gas is also given.
For more information, such as units of the different properties, see
Material:WindowGas in the InputOutput Reference.
--Fred Winkelmann
-----------------------------------------------------------------------------------------------------
! Window gas properties
! Air Argon Krypton
Xenon
DATA GasCoeffsCon /2.873e-3, 2.285e-3, 9.443e-4, 4.538e-4,
0,0,0,0,0,0, & ! Coefficient_A
7.760e-5, 5.149e-5, 2.826e-5,
1.723e-5, 0,0,0,0,0,0, & ! Coefficient_B
0.0 , 0.0 ,
0.0 , 0.0 , 0,0,0,0,0,0 / ! Coefficient_C (not
used)
DATA GasCoeffsVis /3.723e-6, 3.379e-6, 2.213e-6, 1.069e-6,
0,0,0,0,0,0, &
4.940e-8, 6.451e-8, 7.777e-8,
7.414e-8, 0,0,0,0,0,0, &
0.0 , 0.0 , 0.0
, 0.0 , 0,0,0,0,0,0 /
DATA GasCoeffsCp /1002.737 , 521.929 , 248.091 , 158.340,
0,0,0,0,0,0, &
1.2324e-2, 0.0 , 0.0 ,
0.0, 0,0,0,0,0,0, &
0.0 , 0.0 , 0.0 ,
0.0, 0,0,0,0,0,0 /
DATA GasWght /28.97, 39.948, 83.8, 131.3,
0,0,0,0,0,0/
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nuno lourenço wrote:
> In the field windowgas we only have to choose the gas and the
> thickness. But if I want to know the condutivity of each gas where
> could I find it?In the manual you refer windowgasmixture for
> properties but I don´t have that file.Could anyone send me that. Best
> regards, Nuno Lourenço
>
>
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