[EnergyPlus_Support] Exterior blinds always on does not increase heating demand

["Elreq" <tolteca33@xxxxxxxxx>]

Dear Forum
I am simulating an atrium and I have introduced exterior blinds to see the amount of savings on the cooling demand. There are some savings but on the other hand the heating demand also decreases, which is very strange since one would expect the contrary, that due to the fact that there is less solar radiation entering the zone there is more need for heating. Even putting the shading device only during the day, and off in the night, the heating demand decreases. 

I have used the following blinds:
MATERIAL:WINDOWBLIND,
    30002,                   !- Name
    Vertical,                !- Slat orientation
    0.3,                     !- Slat width {m}
    0.3,                     !- Slat separation {m}
    0.05,                    !- Slat thickness {m}
    45,                      !- Slat angle {deg}
    221,                     !- Slat conductivity {W/m-K}
    0,                       !- Slat beam solar transmittance
    0.8,                    !- Slat beam solar reflectance, front side
    0.8,                     !- Slat beam solar reflectance, back side
    0,                       !- Slat diffuse solar transmittance
    0.8,                 !- Slat diffuse solar reflectance, front side
    0.8,                 !- Slat diffuse solar reflectance, back side
    0,                       !- Slat beam visible transmittance
    0.8,                 !- Slat beam visible reflectance, front side
    0.8,                 !- Slat beam visible reflectance, back side
    0,                       !- Slat diffuse visible transmittance
    0.8,               !- Slat diffuse visible reflectance, front side
    0.8,               !- Slat diffuse visible reflectance, back side
    0,              !- Slat IR (thermal) hemispherical transmittance
    0.9,     !- Slat IR (thermal) hemispherical emissivity, front side
    0.9,     !- Slat IR (thermal) hemispherical emissivity, back side
    0.2,                     !- 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}

Help really appreciated.




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