Re: [EnergyPlus_Support] Interior Shade

[Peter G Loutzenhiser <post@xxxxxxxxxxx>]

Mike,

Thanks, yes that helps, we must have crossed emails.

Peter

At 19:32 20.03.2006, you wrote:
>I am not sure what you mean by "then a geometric series used assuming
>infinitely long flat plates".
>
>Reference Figure 63 in the Engineering Reference (p. 146, pdf p. 
>177), and the
>equations under the subheading "Interior Shade" (p. 152, pdf p. 183).
>
>Based on my limited understanding, the overall transmittance of the unshaded
>glazing system (T1,N) is calculated first, both for the current angle of
>incidence and for diffuse radiation.
>
>Then the diffuse back reflectance of the unshaded glazing system is 
>calculated
>(in the figure this is RbN,1, in the equation this is Rb,diff).  This is not
>angular-dependent, of course.  Only the diffuse back reflectance is required,
>because shades are assumed to be perfect diffusers for both reflectance and
>transmittance (see p. 151, pdf p. 182).
>
>Then the equations in the "Interior Shade" section are applied using the
>overall glazing system transmittances (angular and diffuse) and back
>reflectance (diffuse) plus the shade reflectance (diffuse) and transmittance
>(diffuse) to determine the overall shaded glazing system properties.
>
>Diffuse properties are computed as described under the subheading 
>"Calculation
>of Hemispherical Values" (p. 150, pdf p. 181).
>
>There does not appear to be any calculation of a component which may 
>slip past
>the shade through the gap at the bottom of the window.  So, in that respect,
>the window is infinitely long.
>
>Does this help?  Or have I missed the point of your question?
>
>Mike
>
>
>
>On 16 Mar 2006 at 13:14, Peter G Loutzenhiser wrote:
>
> > Dear All,
> >
> > When EnergyPlus simulates an interior shades for windows, is the
> > initial beam radiation component transmitted through the glazing
> > unit/window  angular dependent and then a geometric series used
> > assuming infinitely long flat plates.  The Engineering manual leads
> > me to believe that only diffuse solar transmittances and reflectances
> > are used to calculate the overall transmittance of the blind+glazing
> > unit/window , but I am unsure.
> >
> > Regards,
> > Peter
> >
> >
> >
> > The primary EnergyPlus web site is found at:
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> >
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> >
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> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>========================================================
>Michael J. Witte, GARD Analytics, Inc.
>EnergyPlus Testing and Support
>EnergyPlus-Support@xxxxxxxx
>
>
>
>
>
>The primary EnergyPlus web site is found at:
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