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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/
------------------------------------------------------------------------------------------------------

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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