Iâ??m modeling the shading system in the following way:
WindowProperty:ShadingControl,
controllo radiazione, !- Name
ExteriorBlind, !- Shading Type
, !- Construction with Shading Name
OnIfHighHorizontalSolar, !- Shading Control Type
On, !- Schedule Name
160, !- Setpoint {W/m2, W or deg C}
No, !- Shading Control Is Scheduled
No, !- Glare Control Is Active
lamelle, !- Shading Device Material Name
BlockBeamSolar, !- Type of Slat Angle Control for Blinds
; !- Slat Angle Schedule Name
WindowMaterial:Blind,
lamelle, !- Name
Horizontal, !- Slat Orientation
0.04, !- Slat Width {m}
0.04, !- Slat Separation {m}
0.002, !- Slat Thickness {m}
90, !- Slat Angle {deg}
50, !- Slat Conductivity {W/m-K}
0, !- Slat Beam Solar Transmittance
0.9, !- Front Side Slat Beam Solar Reflectance
0.9, !- Back Side Slat Beam Solar Reflectance
0, !- Slat Diffuse Solar Transmittance
0.9, !- Front Side Slat Diffuse Solar Reflectance
0.9, !- Back Side Slat Diffuse Solar Reflectance
0, !- Slat Beam Visible Transmittance
0.9, !- Front Side Slat Beam Visible Reflectance
0.9, !- Back Side Slat Beam Visible Reflectance
0, !- Slat Diffuse Visible Transmittance
0.9, !- Front Side Slat Diffuse Visible Reflectance
0.9, !- Back Side Slat Diffuse Visible Reflectance
0, !- Slat Infrared Hemispherical Transmittance
0.9, !- Front Side Slat Infrared Hemispherical Emissivity
0.9, !- Back Side Slat Infrared Hemispherical Emissivity
0.05, !- 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}
As weather data Iâ??m using ITA_Bolzano.160200_IGDG.epw (Italy).
Since the â??Type of Slat Angle Controlâ?? is BlockBeamSolar, I would aspect that the slat angle is between 0° and 90° (consider figure 12. of Input-Output Reference), but in July I get the following result:
http://imageshack.us/f/703/k48k.jpg/
If the angle is between 90° and 180°, then the slat faces towards the indoors. Since that window is facing south-east, the slat should face towards the outdoors in the morning, in order to block the beam radiation, shouldn't it?
The result doesn't depend on the day, because in July it is always like in the picture.
Actually, the "Surface Window Blind Beam to Beam Solar Transmittance" is always equal to 0, therefore it seems that the shading control works well, but I don't understand the output relative to the slat angle.
Regards