RE: [EnergyPlus_Support] WWR

To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>

Subject: RE: [EnergyPlus_Support] WWR

From: "Edward G. Lyon" <eglyon@xxxxxxx>

Date: Wed, 26 Oct 2011 13:27:08 -0400

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Thread-topic: [EnergyPlus_Support] WWR

ASHRAE WWR is (area of windows)/(total exterior envelope area).

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

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

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Wednesday, October 26, 2011 1:12 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] WWR

Window to Wall Ratio for Vertical Fenestration

Does e+ calculate this as WWR = the total exterior vertical window and glass door area / total exterior wall area (excluding doors, windows and other sub-surfaces)?

What does ASHRAE 90.1 mean by 40% WWR?

Are they the same?

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References:

[EnergyPlus_Support] WWR
- From: Jean marais