Shading not working when using simple glazing

asked 2021-03-04 15:36:38 -0500

KerryHarp gravatar image

updated 2021-04-07 13:14:10 -0500

I have constructed my exterior window and exterior window with an interior blind. I have defined the blind material. I have defined the shading control. I have the simple glazing system. Finally I have defined the construction as "Exterior Window" in the FenestrationSurface:Detailed for each window. When I run the simulations, I get the same results as an with unshaded windows. What am I missing?

    WindowMaterial:SimpleGlazingSystem,
       Glass,                   !- Name
       0.5678,                !- U-Factor {W/m2-K}
       0.1,                    !- Solar Heat Gain Coefficient
       0.7;                    !- Visible Transmittance

        Construction,
                 Exterior Window,         !- Name
                 Glass;                   !- Outside Layer
         Construction,
                window_w_blinds,         !- Name
                Glass,                   !- Outside Layer
                int_blind;               !- Layer 2

        WindowMaterial:Blind,
            int_blind,               !- Name
            Horizontal,              !- Slat Orientation
            0.025,                   !- Slat Width {m}
            0.01875,                 !- Slat Separation {m}
            0.001,                   !- Slat Thickness {m}
            45,                    !- Slat Angle {deg}
            221,                     !- Slat Conductivity {W/m-K}
            0.0,                     !- Slat Beam Solar Transmittance
            0.5,                     !- Front Side Slat Beam Solar Reflectance
            0.5,                     !- Back Side Slat Beam Solar Reflectance
            0.0,                     !- Slat Diffuse Solar Transmittance
            0.5,                     !- Front Side Slat Diffuse Solar Reflectance
            0.5,                     !- Back Side Slat Diffuse Solar Reflectance
            0.0,                     !- Slat Beam Visible Transmittance
            0.5,                     !- Front Side Slat Beam Visible Reflectance
            0.5,                     !- Back Side Slat Beam Visible Reflectance
            0.0,                     !- Slat Diffuse Visible Transmittance
            0.5,                     !- Front Side Slat Diffuse Visible Reflectance
            0.5,                     !- Back Side Slat Diffuse Visible Reflectance
            0.0,                     !- Slat Infrared Hemispherical Transmittance
            0.9,                     !- Front Side Slat Infrared Hemispherical Emissivity
            0.9,                     !- Back Side Slat Infrared Hemispherical Emissivity
            0.050,                   !- Blind to Glass Distance {m}
            0.5,                     !- Blind Top Opening Multiplier
            0.5,                     !- Blind Bottom Opening Multiplier
            0.5,                     !- Blind Left Side Opening Multiplier
            0.5,                     !- Blind Right Side Opening Multiplier
            ,                        !- Minimum Slat Angle {deg}
            ;                        !- Maximum Slat Angle {deg}

            WindowShadingControl,
                Shades-living_unit1_front,     !- Name
                living_unit1,            !- Zone Name
                1,                       !- Shading Control Sequence Number
                InteriorBlind,           !- Shading Type
                window_w_blinds,         !- Construction with Shading Name
                OnIfScheduleAllows,      !- Shading Control Type
                shading_2012iecc,        !- Schedule Name
                ,                        !- Setpoint {W/m2, W or deg C}
                Yes,                     !- Shading Control Is Scheduled
                No,                      !- Glare Control Is Active
                ,                        !- Shading Device Material Name
                ,                        !- Type of Slat Angle Control for Blinds
                ,                        !- Slat Angle Schedule Name
                ,                        !- Setpoint 2 {W/m2 or deg C}
                ,                        !- Daylighting Control Object Name
                Sequential,              !- Multiple Surface Control Type
                Window_ldf1_1_Bot.unit1,      !- Fenestration Surface 1 Name
                Window_ldf1_1_Top.unit1,      !- Fenestration Surface 2 Name
                Window_ldf1_2_Bot.unit1,      !- Fenestration Surface 3 Name
                Window_ldf1_2_Top.unit1,      !- Fenestration Surface 4 Name
                Window_ldf2_1_Bot.unit1,      !- Fenestration Surface 17 Name
                Window_ldf2_1_Top.unit1,      !- Fenestration Surface 18 Name
                Window_ldf2_2_Bot.unit1,      !- Fenestration Surface 19 Name
                Window_ldf2_2_Top.unit1;     !- Fenestration Surface 20 Name


FenestrationSurface:Detailed,
    Window_ldf1_1_Bot.unit1, !- Name
    Window,                  !- Surface Type
    Exterior Window,  !- Construction Name
    Wall_ldf1_1.unit1,       !- Building Surface Name
    ,                        !- Outside Boundary Condition Object
    ,                        !- View Factor to Ground
    ,                        !- Frame and Divider Name
    1,                       !- Multiplier
    4,                       !- Number of Vertices
    2.500000000000,0.000000000000,0.600000000000,  !- X,Y,Z ==> Vertex 1 {m}
    3.823210000000,0.000000000000,0.600000000000,  !- X,Y,Z ==> Vertex 2 {m}
    3.823210000000,0.000000000000,1.273210000000,  !- X,Y,Z ==> Vertex 3 {m}
2.500000000000,0.000000000000,1.273210000000;  !- X,Y,Z ==> Vertex 4 {m}

There are 32 windows such as this (8 ... (more)

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Comments

Between both cases, have you replaced the Construction Name input field of the window surface objects with either Exterior Window for no blinds or window_w_blinds with interior blinds? It would help to see an example window surface object from your model that's referencing these constructions and shading control you've pasted into your post.

Aaron Boranian gravatar image Aaron Boranian  ( 2021-03-04 17:56:58 -0500 )edit

FenestrationSurface:Detailed added to the question above.

KerryHarp gravatar image KerryHarp  ( 2021-03-05 12:33:09 -0500 )edit

Got it, so what you have pasted above is the no-blind case. For the case with interior blinds, you can make a copy of this IDF and either change the Construction Name input for each of the 32 window objects from Exterior Window to window_w_blinds, or alter the Exterior Window construction to include the interior blinds material layer (it would be identical to window_w_blinds). My vote is option 2, since that's faster. Running should then give different results than the no-blind case.

Have you done either of those two approaches?

Aaron Boranian gravatar image Aaron Boranian  ( 2021-03-05 12:49:55 -0500 )edit

I still couldn't get this to work. I am assuming it has something to do with using the simple glazing system instead of defining a base glazing system.

KerryHarp gravatar image KerryHarp  ( 2021-04-10 09:43:46 -0500 )edit