zoneventilation:windandstackopenarea wrong results

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I'm trying to model natural ventilation with ZoneVentilation:WindandStackOpenArea but I think that I get wrong results. In fact, when I add ventilation through a surface 0.95m2 for only 15 minutes each day of the year without limitations in temperatures, the heating consumption increases dramatically (from 1022 kwh (maximum power 4547 W) to 1922 kwh (maximum power 53302 W !)) I understand that heating consumption should increase because of the difference between heating setpoint temperature and outside temperature, but I think this increase is huge compared to the surface and the duration of opening. What do you think about this results ?

Inputs :

ZoneVentilation:WindandStackOpenArea,
    RDC,                     !- Name
    RDC Thermal Zone,        !- Zone Name
    0.95,                    !- Opening Area {m2}
    Window_ventilation,                     !- Opening Area Fraction Schedule Name
    autocalculate,           !- Opening Effectiveness {dimensionless}
    270,                     !- Effective Angle {deg}
    1.47,                    !- Height Difference {m}
    autocalculate,           !- Discharge Coefficient for Opening
    -100,                    !- Minimum Indoor Temperature {C}
    ,                        !- Minimum Indoor Temperature Schedule Name
    100,                     !- Maximum Indoor Temperature {C}
    ,                        !- Maximum Indoor Temperature Schedule Name
    -100,                    !- Delta Temperature {deltaC}
    ,                        !- Delta Temperature Schedule Name
    -100,                    !- Minimum Outdoor Temperature {C}
    ,                        !- Minimum Outdoor Temperature Schedule Name
    100,                     !- Maximum Outdoor Temperature {C}
    ,                        !- Maximum Outdoor Temperature Schedule Name
    40;                      !- Maximum Wind Speed {m/s}

Thank you for help !