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EnergyPlus v8.4.0 (Sept 2015) has a new feature to account for DOAS effects during sizing. Several new fields have been added to the Sizing:Zone object. From example file 5ZoneFanCoilDOASCool.idf

Sizing:Zone,
    SPACE1-1,                !- Zone or ZoneList Name <snip>
    SZ DSZAD SPACE1-1,       !- Design Specification Zone Air Distribution Object Name
    Yes,                     !- Account for Dedicated Outside Air System
    ColdSupplyAir,           !- Dedicated Outside Air System Control Strategy
    12.8,                    !- Dedicated Outside Air Low Setpoint for Design
    15.6;                    !- Dedicated Outside Air High Setpoint for Design

EnergyPlus v8.4.0 (Sept 2015) has a new feature to account for DOAS effects during sizing. Several new fields have been added to the Sizing:Zone object. From example file 5ZoneFanCoilDOASCool.idf

Sizing:Zone,
    SPACE1-1,                !- Zone or ZoneList Name <snip>
    SZ DSZAD SPACE1-1,       !- Design Specification Zone Air Distribution Object Name
    Yes,                     !- Account for Dedicated Outside Outdoor Air System
    ColdSupplyAir,           !- Dedicated Outside Outdoor Air System Control Strategy
    12.8,                    !- Dedicated Outside Outdoor Air Low Setpoint for Design
    15.6;                    !- Dedicated Outside Outdoor Air High Setpoint for Design