RE: [EnergyPlus_Support] Re: bothering question @ 4ZoneWithShading_Simple

I had a look at the example file and tried to clear up some of my previous confusions.

I confirm that in the rectangular Wall: declaration, the values of the coordinate values in the Zone list are used. The sketchUp picture for 4ZoneWithShading_Simple_1.idf is attached.

Zone,
    ZONE 1,                  !- Name
    0.0000000E+00,           !- Direction of Relative North {deg}
    6.000000,                !- X Origin {m}
    6.000000,                !- Y Origin {m}
    0.0000000E+00,           !- Z Origin {m}
    1,                       !- Type
    1,                       !- Multiplier
    AutoCalculate,           !- Ceiling Height {m}
    AutoCalculate;           !- Volume {m3}

Wall:Exterior,
    Zn001:Wall001,           !- Name
    EXTERIOR,                !- Construction Name
    ZONE 1,                  !- Zone Name
    180,                     !- Azimuth Angle {deg}
    90,                      !- Tilt Angle {deg}
    0,                       !- Starting X Coordinate {m}
    0,                       !- Starting Y Coordinate {m}
    0,                       !- Starting Z Coordinate {m}
    20,                      !- Length {m}
    10;                      !- Height {m}

The actual position of the wall is at 6,6,0. the zone origin.

The fence did not have a zone declaration, therefore it starts at 1.0.0.

Shading:Site,
    Bushes-South,            !- Name
    180,                     !- Azimuth Angle {deg}
    90,                      !- Tilt Angle {deg}
    1,                       !- Starting X Coordinate {m}
    0,                       !- Starting Y Coordinate {m}
    0,                       !- Starting Z Coordinate {m}
    50,                      !- Length {m}
    1;                       !- Height {m}

The '180, !- Azimuth Angle {deg}' is absolute to the building North axis. It will be rotated for daylighting.

Building,
    BUILDING #1,             !- Name
    0.0000000E+00,           !- North Axis {deg}
    Suburbs,                 !- Terrain
    3.9999999E-02,           !- Loads Convergence Tolerance Value
    0.4000000,               !- Temperature Convergence Tolerance Value {deltaC}
    FullExterior,            !- Solar Distribution
    25;                      !- Maximum Number of Warmup Days

BuildingSurface:Detailed, would ignored the Zone origin, when decalared 'worldcoordinate' or 'absolute'.

Surface Coordinate System
Surface Geometry,

UpperLeftCorner,

Counterclockwise,

WorldCoordinateSystem, !- This is for the "detailed" format, to ignor the zone origin,

!- but would also stop the rotation of the building North

!- when the object ended on this line. A warning is

!- usually issued for daylighting.

RelativeCoordinateSystem, !- This is for daylighting, always use relative, and accept

!- building rotation relative to true North.

RelativeToZoneOrigin; !- This is for the rectangular format only.

Sometime ago, I tried a mixed 'detailed' and rectangular format to create a zone, and the IDF cannot be openned by the OpenStudio. Since then I have been using the 'detailed' format all the time.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: linda@xxxxxxxxxxxxxx
Date: Tue, 2 Nov 2010 08:01:18 -0600
Subject: Re: [EnergyPlus_Support] Re: bothering question @ 4ZoneWithShading_Simple_1.idf

It's been a while since I made this sample file.

The rectangular surfaces default to being relative to zone origin, as you can see from the .eio file:

! <SurfaceGeometry>,Starting Corner,Vertex Input Direction,Coordinate System,Daylight Reference Point Coordinate System,Rectangular (Simple) Surface Coordinate System
Surface Geometry,UpperLeftCorner,Counterclockwise,WorldCoordinateSystem,RelativeCoordinateSystem,RelativeToZoneOrigin

I will make the SurfaceGeomtry object so it is explicit to alleviate confusion.

At 12:11 AM 11/2/2010, leebye2008 wrote:

If the oringin of zone 1 is changed to 0,0,0, it will overlap the bushes that origines from 1,0,0.
Anyway ,the result and the surface details seems very different.
In fact every point of the building is defined relatively in that case.But the coordinate system is world, and it is still a right shaped building.

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RE: [EnergyPlus_Support] Re: bothering question @ 4ZoneWithShading_Simple_1.idf