Re: [EnergyPlus_Support] RE: Window U-factor follow up question

["Neal Kruis neal.kruis@xxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

The window edge-of-glass U-factor is defined using the Ratio of Frame-Edge Glass Conductance to Center-Of-Glass Conductance field in the WindowProperty:FrameAndDivider object. If you know your center-of-glass U-factor, then you can determine the correct ratio that gives you the edge-of-glass U-factor you want.

On Fri, Feb 19, 2016 at 8:09 AM, 'Edward G. Lyon' eglyon@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

You can find a good description of how E+ uses WINDOW data here

 

http://nrel.github.io/EnergyPlus/Tips_and_Tricks_Using_EnergyPlus/Tips_and_Tricks_Using_EnergyPlus/#input

 

Basically a center of glass value is modified by an edge correction ratio from WINDOW

 

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct 
617.285.2162 mobile 
781.907.9009 fax
www.sgh.com

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, February 19, 2016 7:55 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Window U-factor follow up question

 

 

I am used to the overall window U-factor being calculated from three areas of the window ? frame U-factor, edge U-factor and COG U-factor. The area weighted average of these three factors calculates the overall window U-factor. EnergyPlus has inputs for frame U-factor and glass U-factor. How does the edge U-factor fit into the picture?

 

 

Christopher Jones, P.Eng.
Senior Engineer

 

WSP Canada Inc.

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4
T +1 416-644-4226

F +1 416-487-9766

C +1 416-697-0056

 

www.wspgroup.com

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, February 19, 2016 6:14 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Window U-factor

 

 

Dear Edward

 

Thank you for your suggestion.

 

Hossein

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Posted by: Neal Kruis <neal.kruis@xxxxxxxxxxxxxxxxxxxxx>

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