[EnergyPlus_Support] Re: interior blinds

["Dan Haydon" <danhay45@xxxxxxxxx>]

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Rob Hitchcock 
<RJHitchcock@...> wrote:
>
> Placing blinds and/or shades on the interior of a window will not 
stop 
> solar gains from entering the zone.  Solar will still be 
transmitted 
> through the window and will warm up the blind/shade surface, which 
is 
> inside the zone.  Some solar will be reflected back out the window, 
but 
> this will not reliably lower the overall solar gains relative to a 
> window without an interior blind or shade.
> 
> Try placing the blind/shade on the exterior of the window for 
comparison.
> 
> Rob
> =======

Rob the emissive nature of the interior blinds can be tracked with a 
infrared camera, it will in fact show you a crona of heat energy 
blasting in to the building with in 2 to 6 inches around the window 
depending how well the wall is insulated and re asorbing the heat . 
For instance here in Arizona I can measure 114 F surface temp of a 
set of wood plantation shutters!

Dan H
> yiqunpan wrote:
> 
> > I made a model to simulate the heat transfer from the evenlope. 
In the
> > model I used interior blinds for windows as well as without 
blinds. I
> > thought that the cooling loads through the envelope due to solar 
heat
> > gain should be higher without blinds than with blinds, but the 
results
> > show that in some time (e.g. early morning on east facade and late
> > afternoon on west facade) it is higher with blinds. What is the 
reason
> > exactly? I also tried interior shade, but the results are similar.
> >
> >  
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>




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