Re: [EnergyPlus_Support] View factor and Azimuth

["Michael J. Witte" <mjwitte@xxxxxxxx>]

On 20 May 2005, at 15:10, Ali_Ajmi wrote:

> Dear All,
> 
> I have one story building with five zone. I am facing some difficulties to
> understand how to put the following values: 1) View factor to the roof = 1,
> floor 0 and interior walls. 

Are you referring to the "View Factor to Ground" field in the 
Surface:HeatTransfer object?  If so, then for a roof, this should be zero - the 
outside surface of a roof does not "see" the ground at all.  If the 
OutsideFaceEnvironment is not "Exterior", then this field is ignored.  So, it 
does not matter for a floor which is attached to ground or for interior 
surfaces.

2) The value of the azimuth of the roof and floor of
> the five zone appear in the out file as 0,180 and 90, what should be the correct
> values and how can rectify it.
> 

For a horizontal surface (a floor or flat roof), azimuth does not really have 
any meaning.  Azimuth is calculated for these surfaces based on which vertex is 
entered as the first vertex.  The tilt is important, and should be 0 for a flat 
roof/ceiling and 180 for a floor.  

Mike


> Thanks
> Ali 
> 
> 
> 
> 
> ---------------------------------
>  Yahoo! Messenger  - want a free & easy way to contact your friends online?  
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/