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Re: [EnergyPlus_Support] changing glass properties
Glass properties require that:
Transmittance + Reflectance + Absorptance = 1
Making your transmittance = 0.99998 should work.
neslihanturkmenoglu wrote:
>
> I had to define a glass layer in order to put my blinds in front of
> window. But as I do not want the glass to be considered in the
> calculation(open window with blind)I changed the transmittance and
> reflectance values to 0.99999 and 0.00001 in order. But it gives an
> error like;
>
> ** Severe ** Solar transmittance + front solar reflectance not <
> 1.0 for material GLASS - CLEAR PLATE 1 / 4 IN
> ** Severe ** Solar transmittance + back solar reflectance not <
> 1.0 for material GLASS - CLEAR PLATE 1 / 4 IN
> ** Severe ** Visible transmittance + front visible reflectance
> not < 1.0 for material GLASS - CLEAR PLATE 1 / 4 IN
> ** Severe ** Visible transmittance + back visible reflectance
> not < 1.0 for material GLASS - CLEAR PLATE 1 / 4 IN
>
> their sum is equal to 1 . So what is the error? I didn't
> understand.I've attached my summary input file.
> Thank you
>
> !- =========== ALL OBJECTS IN CLASS: MATERIAL:WINDOWGLASS
> ===========
>
> MATERIAL:WINDOWGLASS,
> GLASS - CLEAR PLATE 1 / 4 IN, !- Name
> SpectralAverage, !- Optical Data Type
> , !- Name of Window Glass Spectral Data
> Set
> 0.0001, !- Thickness {m}
> 0.999999999, !- Solar Transmittance at Normal
> Incidence
> 0.000000001, !- Solar Reflectance at Normal
> Incidence: Front Side
> 0.000000001, !- Solar Reflectance at Normal
> Incidence: Back Side
> 0.999999999, !- Visible Transmittance at Normal
> Incidence
> 0.000000001, !- Visible Reflectance at Normal
> Incidence: Front Side
> 0.000000001, !- Visible Reflectance at Normal
> Incidence: Back Side
> 0, !- IR Transmittance at Normal Incidence
> 0.8400000, !- IR Hemispherical Emissivity: Front
> Side
> 0.8400000, !- IR Hemispherical Emissivity: Back
> Side
> 0.9000000; !- Conductivity {W/m-K}
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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