[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] Slat angle





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



__._,_.___


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.




Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___