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Re: [EnergyPlus_Support] Building Overhangs

On 25 Feb 2003, at 3:52, yijun huang wrote:

> Edward has suggested seperate 2D thermal modelling for the roof (using
> THERM) to circumvent the problem, and I was wondering if there are any
> similar strategies that I can use in E+? (Since I don't have support
> in using THERM)

The only thing you can do inside EnergyPlus is to use adjusted 
thermal properties for the roof or add a special heat transfer 
surface to represent the effect of the overhang.  Either approach  
would require a separate 2-D or 3-D analysis to determine what the 
proper adjustments should be.  Perhaps you could find a useful tool 
in the USDOE Building Energy Tools Directory:

http://www.eren.doe.gov/buildings/tools_directory/


> Also, what is the difference between the 3 mentioned types of detached
> shading surfaces?

Sorry, I forgot to answer this question.

Surface:Shading:Detached and Surface:Shading:Detached:Fixed are 
identical to each other.  The coordinates for these surface types are 
always in world coordinates.

Surface:Shading:Detached:Building is defined in the building 
coordinate system.  If relative coordinates are being used, then the 
BUILDING North Axis rotation will be applied.

Mike



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