Revision history [back]

In EnergyPlus, if you are autosizing your model you can specify the amount of outdoor air in a DesignSpecification:OutdoorAir object and reference that object in the Sizing:Zone' object using theDesign Specification Outdoor Air Object Name` input field. You can change this from 1000 to 0 to compare results.

Sizing:Zone,
  West Zone,               !- Zone or ZoneList Name
  SupplyAirTemperature,    !- Zone Cooling Design Supply Air Temperature Input Method
  14.,                     !- Zone Cooling Design Supply Air Temperature {C}
  ,                        !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
  SupplyAirTemperature,    !- Zone Heating Design Supply Air Temperature Input Method
  48.,                     !- Zone Heating Design Supply Air Temperature {C}
  ,                        !- Zone Heating Design Supply Air Temperature Difference {deltaC}
  0.009,                   !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  0.009,                   !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  SZ DSOA West Zone,       !- Design Specification Outdoor Air Object Name
  0.0,                     !- Zone Heating Sizing Factor
  0.0,                     !- Zone Cooling Sizing Factor
  DesignDay,               !- Cooling Design Air Flow Method
  0,                       !- Cooling Design Air Flow Rate {m3/s}
  ,                        !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
  ,                        !- Cooling Minimum Air Flow {m3/s}
  ,                        !- Cooling Minimum Air Flow Fraction
  DesignDay,               !- Heating Design Air Flow Method
  0,                       !- Heating Design Air Flow Rate {m3/s}
  ,                        !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
  ,                        !- Heating Maximum Air Flow {m3/s}
  ;                        !- Heating Maximum Air Flow Fraction

DesignSpecification:OutdoorAir,
  SZ DSOA West Zone,       !- Name
  AirChanges/Hour,         !- Outdoor Air Method
  0.0,                     !- Outdoor Air Flow per Person {m3/s-person}
  0.0,                     !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
  0.0,                     !- Outdoor Air Flow per Zone {m3/s}
  1000.0;                  !- Outdoor Air Flow Air Changes per Hour {1/hr}

If you are not autosizing your model you can reference the DesignSpecification:OutdoorAir object in many of the HVAC equipment models (usually ZoneHVAC equipment). Check the InputOutputReference documentation for the equipment model you are using to see where and how to specify the outdoor air quantity.

In EnergyPlus, if you are autosizing your model you can specify the amount of outdoor air in a DesignSpecification:OutdoorAir object and reference that object in the Sizing:Zone' Sizing:Zone object using thethe Design Specification Outdoor Air Object Name` Name input field. You can change this from 1000 to 0 to compare results.

Sizing:Zone,
  West Zone,               !- Zone or ZoneList Name
  SupplyAirTemperature,    !- Zone Cooling Design Supply Air Temperature Input Method
  14.,                     !- Zone Cooling Design Supply Air Temperature {C}
  ,                        !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
  SupplyAirTemperature,    !- Zone Heating Design Supply Air Temperature Input Method
  48.,                     !- Zone Heating Design Supply Air Temperature {C}
  ,                        !- Zone Heating Design Supply Air Temperature Difference {deltaC}
  0.009,                   !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  0.009,                   !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  SZ DSOA West Zone,       !- Design Specification Outdoor Air Object Name
  0.0,                     !- Zone Heating Sizing Factor
  0.0,                     !- Zone Cooling Sizing Factor
  DesignDay,               !- Cooling Design Air Flow Method
  0,                       !- Cooling Design Air Flow Rate {m3/s}
  ,                        !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
  ,                        !- Cooling Minimum Air Flow {m3/s}
  ,                        !- Cooling Minimum Air Flow Fraction
  DesignDay,               !- Heating Design Air Flow Method
  0,                       !- Heating Design Air Flow Rate {m3/s}
  ,                        !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
  ,                        !- Heating Maximum Air Flow {m3/s}
  ;                        !- Heating Maximum Air Flow Fraction

DesignSpecification:OutdoorAir,
  SZ DSOA West Zone,       !- Name
  AirChanges/Hour,         !- Outdoor Air Method
  0.0,                     !- Outdoor Air Flow per Person {m3/s-person}
  0.0,                     !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
  0.0,                     !- Outdoor Air Flow per Zone {m3/s}
  1000.0;                  !- Outdoor Air Flow Air Changes per Hour {1/hr}

If you are not autosizing your model you can reference the DesignSpecification:OutdoorAir object in many of the HVAC equipment models (usually ZoneHVAC equipment). Check the InputOutputReference documentation for the equipment model you are using to see where and how to specify the outdoor air quantity.

In EnergyPlus, if you are autosizing your model you can specify the amount of outdoor air in a DesignSpecification:OutdoorAir object and reference that object in the Sizing:Zone object using the Design Specification Outdoor Air Object Name input field. You can change this from 1000 to 0 to compare results.

Sizing:Zone,
  West Zone,              !- Zone or ZoneList Name
  SupplyAirTemperature,   !- Zone Cooling Design Supply Air Temperature Input Method
  14.,                    !- Zone Cooling Design Supply Air Temperature {C}
  ,                       !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
  SupplyAirTemperature,   !- Zone Heating Design Supply Air Temperature Input Method
  48.,                    !- Zone Heating Design Supply Air Temperature {C}
  ,                       !- Zone Heating Design Supply Air Temperature Difference {deltaC}
  0.009,                  !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  0.009,                  !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  SZ DSOA West Zone,      !- Design Specification Outdoor Air Object Name
  0.0,                    !- Zone Heating Sizing Factor
  0.0,                    !- Zone Cooling Sizing Factor
  DesignDay,              !- Cooling Design Air Flow Method
  0,                      !- Cooling Design Air Flow Rate {m3/s}
  ,                       !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
  ,                       !- Cooling Minimum Air Flow {m3/s}
  ,                       !- Cooling Minimum Air Flow Fraction
  DesignDay,              !- Heating Design Air Flow Method
  0,                      !- Heating Design Air Flow Rate {m3/s}
  ,                       !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
  ,                       !- Heating Maximum Air Flow {m3/s}
  ;                       !- Heating Maximum Air Flow Fraction

DesignSpecification:OutdoorAir,
  SZ DSOA West Zone,      !- Name
  AirChanges/Hour,        !- Outdoor Air Method
  0.0,                    !- Outdoor Air Flow per Person {m3/s-person}
  0.0,                    !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
  0.0,                    !- Outdoor Air Flow per Zone {m3/s}
  1000.0;                 !- Outdoor Air Flow Air Changes per Hour {1/hr}

If you are not autosizing your model you can reference the DesignSpecification:OutdoorAir object in many of the HVAC equipment models (usually ZoneHVAC equipment). Check the InputOutputReference documentation for the equipment model you are using to see where and how to specify the outdoor air quantity.