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Re: [EnergyPlus_Support] exterior convective cavity



Thanks for explaining this baffling subject, Brent.

Fred



Griffith, Brent wrote:

>Ian, 
> 
>1.  The baffle is assoicated with the Surface:HeatTransfer object and uses the "net" area.  If that surface also has a sub surface, i.e. window, then the baffle is only on the part of the surface that surrounds the subsurface.  The window is treated in the usual manner and doesn't have the opaque baffle in front of it. 
> 
>2.  You would still use the Effective Thickness field.  This determines the depth or thickness of the cavity regardless of tilt. 
> 
>Brent
>
>-----Original Message-----
>From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Ian Doebber
>Sent: Thursday, October 27, 2005 10:06 AM
>To: EnergyPlus_Support@xxxxxxxxxxxxxxx
>Subject: [EnergyPlus_Support] exterior convective cavity
>
>
>I ran an example room with an external baffle outside a wall with a
>window.  I have 2 questions:
>
>1.      Considering the baffle is opaque, how come the window still
>transmitted a significant amount of solar energy as if there where no
>obstruction in front of it?
>
>2.      The inputs of the baffle do not seem to include how to specify
>how far the baffle is from the wall.  Since my baffle is vertical, the
>"Effective Thickness of Cavity Behind Exterior Baffle" field is not
>used.  How can I specify the distance between my baffle and wall?
>
>Thanks
>
>Ian Doebber
>Graduate Mechanical Engineer
>Arup
>901 Market Street Suite 260 San Francisco CA 94103
>tel: 415-946-0292
>fax: 415-957-9096
>cell: 415-613-4314
>ian.doebber@xxxxxxxx
>www.arup.com
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