RE: [EnergyPlus_Support] ZoneVentilation:WindandStackOpenArea

[Lixing Gu <gu@xxxxxxxxxxxx>]

Here is the revised description and the revision will be available in the
next release.

Field: Effective Angle

This is the angle in degrees counting from the North clockwise to the
opening outward normal. The value must be between 0 and 360, with the
default being 0 if this input field is left blank. The Effective Angle is 0
if the opening outward normal faces North, 90 if faces East, 180 if faces
South, and 270 if faces West. The value is fixed and independent of
coordinate system defined in the GlobalGeometryRules object. This input
field value is used to calculate the angle between the wind direction and
the opening outward normal to determine the opening effectiveness values
when the input field Opening Effectiveness = Autocalculate.

Hope this helps.

Lixing


-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Luis Blanes
Sent: Wednesday, June 08, 2011 4:34 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] ZoneVentilation:WindandStackOpenArea

Hi Modellers

I am just trying to understand the values within the following Object:

ZoneVentilation:WindandStackOpenArea

Specifically I don't really understand the "OpeningEffectiveness" and
"EffectiveAngle" variables.

According with the I/O manua, If in "OpeningEffectiveness" is input
"Autocalculate", then E+ will use values in "EffectiveAngle" but:

What is the angle to input? Is not really clear in the I/O manual. It states
"the effective angle of the opening outward normal in degrees...", but I
would like somebody to explain as this: "The angle between the normal and
xxxx "

I am trying to understand this, but I do not reach to an conclusion...Does
it means the angle formed by the outward normal and the North? Why do we
have to input that? 

Has anyone have a better understanding on it?

Thanks
Luis Blanes





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