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Re: [EnergyPlus_Support] Relationship between G-C and Conductivity

>From the DOE-2.1 Reference Manual, p. III.49:

  GLASS-CONDUCTANCE is used to specify the heat conductance of the total window
  except for the outside film coefficient.

This keyword is part of the GLASS-TYPE command which describes a complete 
window construction which may be made of 1 or more panes (layers) of glass.

In EnergyPlus, MATERIAL:WINDWOGLASS describes a single layer (pane) of glass.  
The Conductivity of this layer is just the conductivity of the glass and does 
not include interior or exterior film (convection) coefficients.

For a single-pane window, EnergyPlus-MATERIAL:WINDWOGLASS-Conductivity would be 
equal to the equivalent DOE-2.1E-GLASS-CONDUCTANCE minus the inside film  
coefficient.  

For multi-pane windows, the DOE-2.1E value is the conductance of all glass 
panes and all air gaps combined, so it is very different from the EnergyPlus 
Conductivity.

Mike



On 11 May 2005, at 2:30, beyangj wrote:

> Dear,
> I want to know what's the relationship between the Glass-Conductance in 
> the DOE2.1E INP file and the Conductivity {W/m-K} in the 
> MATERIAL:WINDOWGLASS in the IDF file of Energyplus. Could you tell me 
> the relationship between them?
> 
> Best,
> 
> Stewart
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
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> 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




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