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Fw: [EnergyPlus_Support] Changing orientation of building

Thanks, James
It worked, I rotated the building by 44 deg (instead of 45) and now WWR is exactly 40% on each wall.

----- Forwarded Message ----
From: "James V Dirkes II, PE" <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Mon, 3 January, 2011 8:07:30 PM
Subject: RE: [EnergyPlus_Support] Changing orientation of building


Dear All,


I have not examined the wall area relationships in such detail as you are doing, but I suspect that you might want to try rotating 44 degrees.  There may be some confusion within E+ because you are exactly on the dividing line between North and East.


The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653


From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Pregas Srinivasan
Sent: Monday, January 03, 2011 9:31 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Changing orientation of building




Why the wall opening area @ East is 625.08 (m2)?  Is should be 417.54 (40 % of 1043.85) according to you. For some reason wall area  @ east is addition of 207.54+417.54= 625.08


On Mon, Jan 3, 2011 at 8:44 AM, Nick Long <nickenergy124@xxxxxxxxx> wrote:


Thanks Pedro,


But when i changed the orientation to 45deg, the window wall ratio summary is as follows (earlier WWR was 40% on all 4 walls). But here in South it indicates zero.


Can anyone help in explaning this.


Window-Wall Ratio


North (315 to 45 deg)

East (45 to 135 deg)

South (135 to 225 deg)

West (225 to 315 deg)

Gross Wall Area [m2]






Window Opening Area [m2]






Window-Wall Ratio [%]







Thanks in advance.




From: Pedro Peixeiro <ppeixeiro@xxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Mon, 3 January, 2011 4:19:46 PM
Subject: Re: [EnergyPlus_Support] Changing orientation of building


Hello Nick.

On the Building object you can specify the angle between the north axis and the y axis of the building. In the IDF editor, its under the Simulation Parameters group, right at the start.


On 03-01-2011 10:40, Nick Long wrote:


Dear all


I need to study the performance of building at different orientation, how can i do that in idf file, keeping all the other envelop details same.


Thanks and Regards








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