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Problems with shading in EnergyPlus

asked 2015-12-30 05:41:01 -0600

gerald's avatar

updated 2017-05-17 12:29:08 -0600

Hey, I want to model a simple shading control (exterior shade). Tutorial from bigladder: Method 2:

Define the Construction of the window without the shade, the so-called “bare” construction.
Reference the bare construction in the FenestrationSurface:Detailed for the window.
Define the WindowMaterial:Shade.
Define another Construction, called the “shaded construction,” that includes the WindowMaterial:Shade.
Define a WindowProperty:ShadingControl for the window in which you (a) reference the shaded construction and (b) specify how the shade is controlled

I have the following obejects within the model:

WindowMaterial:Shade,
    Shade,                   !- Name
    0.2,                     !- Solar Transmittance {dimensionless}
    0.2,                     !- Solar Reflectance {dimensionless}
    0.2,                     !- Visible Transmittance {dimensionless}
    0.2,                     !- Visible Reflectance {dimensionless}
    0.2,                     !- Infrared Hemispherical Emissivity {dimensionless}
    0.2,                     !- Infrared Transmittance {dimensionless}
    0.002,                   !- Thickness {m}
    1,                       !- Conductivity {W/m-K}
    0.05,                    !- Shade to Glass Distance {m}
    0.5,                     !- Top Opening Multiplier
    0.5,                     !- Bottom Opening Multiplier
    0.5,                     !- Left-Side Opening Multiplier
    0.5,                     !- Right-Side Opening Multiplier
    ;                        !- Airflow Permeability {dimensionless}

The shade construction

Construction,
    shaded construction,     !- Name
    Shade;                   !- Outside Layer

Construction,
    Exterior Window,         !- Name
    GlassSimple;             !- Outside Layer

WindowMaterial

WindowMaterial:SimpleGlazingSystem,
    GlassSimple,             !- Name
    1.1,                     !- U-Factor {W/m2-K}
    0.609;                   !- Solar Heat Gain Coefficient

Fenstration

FenestrationSurface:Detailed,
    window_mi,               !- Name
    Window,                  !- Surface Type
    Exterior Window,         !- Construction Name
    wall_s,                  !- Building Surface Name
    ,                        !- Outside Boundary Condition Object
    ,                        !- View Factor to Ground
    ShadeControl,            !- Shading Control Name
    ,                        !- Frame and Divider Name
    ,                        !- Multiplier
    4,                       !- Number of Vertices
    1.153144302659, 0.000000000000, 1.942648890598,
                                        !- X,Y,Z  1 {m}
    1.153144302659, 0.000000000000, 1.092648890598,
                                        !- X,Y,Z  2 {m}
    2.043144302659, 0.000000000000, 1.092648890598,
                                        !- X,Y,Z  3 {m}
    2.043144302659, 0.000000000000, 1.942648890598;
                                        !- X,Y,Z  4 {m}

ShadingControl

WindowProperty:ShadingControl,
    ShadeControl,            !- Name
    ExteriorShade,           !- Shading Type
    shaded construction,     !- Construction with Shading Name
    AlwaysOn,                !- Shading Control Type
    ,                        !- Schedule Name
    ,                        !- Setpoint {W/m2, W or deg C}
    No,                      !- Shading Control Is Scheduled
    No,                      !- Glare Control Is Active
    Shade,                   !- Shading Device Material Name
    FixedSlatAngle,          !- Type of Slat Angle Control for Blinds
    ;                        !- Slat Angle Schedule Name

I get the following error message:

   ** Severe  ** CheckAndSetConstructionProperties: The single-layer window construction=SHADED CONSTRUCTION has a gas, complex gap, shade, complex shade, screen or blind material; it should be glass of simple glazing system.
   ** Warning ** WindowProperty:ShadingControl="SHADECONTROL" Both Construction with Shading Name and Shading Device Material Name are specified.
   **   ~~~   ** The Construction with Shading Name="SHADED CONSTRUCTION" will be used.
   **  Fatal  ** GetSurfaceData: Errors discovered, program terminates.

Thank you for your help!

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answered 2015-12-30 08:07:19 -0600

Chandan Sharma's avatar

The following should make it work..

Construction,
    shaded construction,     !- Name
    Shade,                   !- Outside Layer
    GlassSimple;             !- Layer 1

Also, per the IO reference, field "Shading Device Material Name" in WindowProperty:ShadingControl is required if "Construction with Shading Name" is not specified. So instead of putting "Shade", this field should be left blank here.

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Asked: 2015-12-30 05:41:01 -0600

Seen: 1,379 times

Last updated: Dec 30 '15