Revision history [back]

What's a good reference for reasonable parameters for occupants opening windows? There are two objects from energyplus example files below, and the indoor temperatures are beyond reasonable thermostat setpoints. (Maybe these accurately model user behavior though?...) In the ASHRAE9012016_ApartmentHighRise_Denver.idf example, there is also some EMS present to change thermostat setpoints based on the windows being open, which could explain a lot of errors with those models. Some of the other ASHRAE9012016_insert_building_type_Denver.idf have similar ZoneVentilation:WindandStackOpenArea and EMS objects.

The VentilationSimpleTest.idf has a pretty low indoor setpoint as well, but this object appears to represent a permanent opening rather than an operable window.

ASHRAE9012016_ApartmentHighRise_Denver.idf

ZoneVentilation:WindandStackOpenArea,
    G SW Apartment Sliding Door Ventilation,  !- Name
    G SW Apartment,          !- Zone Name
    0.1181,                  !- Opening Area {m2}
    Sliding_Doors_Ventilation_Availability_SCH,  !- Opening Area Fraction Schedule Name
    autocalculate,           !- Opening Effectiveness {dimensionless}
    180,                     !- Effective Angle {deg}
    15.2393,                 !- Height Difference {m}
    autocalculate,           !- Discharge Coefficient for Opening
    18.89,                   !- Minimum Indoor Temperature {C}
    ,                        !- Minimum Indoor Temperature Schedule Name
    25.56,                   !- Maximum Indoor Temperature {C}
    ,                        !- Maximum Indoor Temperature Schedule Name
    -100,                    !- Delta Temperature {deltaC}
    ,                        !- Delta Temperature Schedule Name
    15.56,                   !- Minimum Outdoor Temperature {C}
    ,                        !- Minimum Outdoor Temperature Schedule Name
    26.67,                   !- Maximum Outdoor Temperature {C}
    ,                        !- Maximum Outdoor Temperature Schedule Name
    40;                      !- Maximum Wind Speed {m/s}

VentilationSimpleTest.idf

ZoneVentilation:WindandStackOpenArea,
    ZONE 3 Ventl 2,          !- Name
    ZONE 3,                  !- Zone Name
    0.5,                     !- Opening Area {m2}
    Constant,                !- Opening Area Fraction Schedule Name
    0.2,                     !- Opening Effectiveness {dimensionless}
    0.0,                     !- Effective Angle {deg}
    1.0,                     !- Height Difference {m}
    0.5,                     !- Discharge Coefficient for Opening
    18.0,                    !- Minimum Indoor Temperature {C}
    ,                        !- Minimum Indoor Temperature Schedule Name
    ,                        !- Maximum Indoor Temperature {C}
    ,                        !- Maximum Indoor Temperature Schedule Name
    1.0;                     !- Delta Temperature {deltaC}