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Re: [EnergyPlus_Support] WindowMaterial:Glazing



it depends on your solar distribution model. 

with the "exterior interior with reflections" model, beam solar will go through the west window, land on the east window. At this point a potion will pass through the east window as fully diffuse and the rest will be reflected as fully diffuse.

For proper daylighting analysis, I would suggest using a raytracing program. The popular Radiance engine has been incorporated into many programs such as DesignBuilder and I think Sketchup.

The e+ daylighting models are intended to reflect annual energy savings due to daylighting stradegies.

Mit freundlichen GrüÃ?en- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel.   +49 30 6706662-23

On 07.07.2015, at 21:07, "stanleyshc@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Hi all. To study daylighting in an atrium, I compared the performance of following standard glazing defined in EnergyPlus separately in an atrium:

(1) Clear 6mm (Tv=0.881, Rv=0.08)

(2) Theoretical Glass [170] (Tv=0.2512, Rv=0.6988)

(3) Theoretical Glass [168] (Tv=0.4573, Rv=0.4927)

where

Tv = Visible transmittance, and

Rv = Visible reflectance


Optical data type = SpectralAverage

Solar diffusing = No


Please kindly refer to an attached PNG file for the remaining parameters.


According to the input-output reference manual, beam sunlight should be reflected as beam with no diffuse component. However, using the theoretical Glass [170], the illuminance result did not show beam reflection. Say, strong beam falling on east facade in the atrium is not reflected to the west facade.


Would you please help me to check if I have input wrong parameter? I am worried if EnergyPlus could not be used to simulate daylighting in an atrium.


Thanks a lot.

Stanley


<Glazing.png>


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Posted by: "jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>


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