Shading:Site, Shading:Building (Page 241 of I/O Ref.Manual)
These objects are used to describe rectangular shading elements that are external to the building. Examples are trees, high fences, near-by hills, and neighboring buildings.
If relative coordinates are used (ref: Field: Coordinate System in GlobalGeometryRules),
shading surfaces entered with Shading:Site remain stationary if the building is rotated, whereas those entered with Shading:Building rotate with the building.
If world coordinates are used Shading:Site and Shading:Building are equivalent.
======================== (Meaning that both would not rotate.)
I assume that you have a building geometry defined in your IDF.
Building,
4 Linked Residential Builldings, !- Name
0, !- North Axis {deg}
Suburbs, !- Terrain
3.9999999E-02, !- Loads Convergence Tolerance Value
0.4000000, !- Temperature Convergence Tolerance Value {deltaC}
FullInteriorAndExteriorWithReflections, !- Solar Distribution
25; !- Maximum Number of Warmup Days
In the building object entry, the number entered in the field North Axis (deg) will rotate your whole building and zones, if the vertices are not enered using world coordinates. Be careful if your zone coordinates for origin are not 0,0,0, and use relative coordinates.
GlobalGeometryRules,
UpperLeftCorner, !- Starting Vertex Position
Counterclockwise, !- Vertex Entry Direction
Relative; !- Coordinate System
(Two more fields below are assumed to be 'relative'.)
Not long ago there were some discussions on this topic in detail.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jtorrebueno@xxxxxxx
Date: Mon, 7 Feb 2011 13:51:05 -0800
Subject: Re: [EnergyPlus_Support] Changing orientation of building
I know how to rotate the base coordinate system which I believe rotates everything and I know there is a variable that sets the rotation of a zone but I dont know a way to rotate a building.
On Feb 7, 2011, at 7:49 AM, YuanLu Li wrote:
There are many type osf shadeings. For example:
Shading:Zone:Detailed,
Shading:Site:Detailed, or
Shading:Building:Detailed.
I believe, detached Shading:site objects will not rotate with the building or zone objects.
When you run the annual simulation, the solar angles are change every timestep.When you change the date field in the DesignDay object, the solar angle is for that day only. You can use Mar.21, June 21, Sept.21 and Dec.21 to see the effect of the sun on windows for the four season. These can be simulated on one IDF, using the CustomDay1, SummerDesignDay, CustomDayII, WinterDesignDay. *Day types 11, 9, 12, 10.) In fact, you can assign any date to do detailed study of the solar beam on the building.Both azimuth and altitude angle variables are listed at timesteps.Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jtorrebueno@xxxxxxx
Date: Sun, 6 Feb 2011 08:14:53 -0800
Subject: Re: [EnergyPlus_Support] Changing orientation of building
ThanksThat is what I thought. The behavior I need is to change the orientation of one structure. I am trying to study the optimization of the angle of a solar array with respect to utility time of day tariffs. I intend to run the same building with the solar array at different azimuth. I have the array mounted on a shade structure. I would like to change the azimuth by changing one variable but the only way I know how to change the azimuth of a structure is to calculate backwards through the trig to find the corners in rectangular coordinates. Doable but tedious. Is there any way to specify angles of individual structures or enter orientations in polar coordinates?
On Feb 4, 2011, at 12:15 AM, Pedro Peixeiro wrote:
Hi Jose
The building rotation in the Building object applies to all structures, including shading. changes effects the entire model.
Pedro
On 04-02-2011 0:40, Jose Torre-Bueno wrote:
Does anybody know it it is possible to have two structures or a structure and a shade object and rotate them with respect to each other? I believe the angle in the building object will apply to all objects specified in the file.
On Jan 3, 2011, at 2:49 AM, Pedro Peixeiro wrote:
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.
Pedro
On 03-01-2011 10:40, Nick Long wrote:
Dear allI 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 RegardsNick
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