I would like to know if there is any use for Outdoor Air Schedule Name in DesignSpecification:OutdoorAir.
I tested how it works with some ExampleFiles:
- 5ZoneWarmest.idf (Typical VAV with Reheat)
- 5ZoneFanCoilDOASCool.idf (Typical DOAS + FCU)
- VariableRefrigerantFlow_5Zone.idf (Typical VRF)
Each ExampleFile has 5 conditioned Zones. The following input has been unified to all the revised ExampleFiles here (V23-1-0).
Schedule:Compact,
FanAvailSched, !- Name
Fraction, !- Schedule Type Limits Name
Through: 12/31, !- Field 1
For: AllDays, !- Field 2
Until: 7:00, !- Field 3
0, !- Field 4
Until: 17:00, !- Field 5
1, !- Field 6
Until: 24:00, !- Field 7
0; !- Field 8
Schedule:Compact,
OutdoorAirAvailSched, !- Name
Fraction, !- Schedule Type Limits Name
Through: 12/31, !- Field 1
For: AllDays, !- Field 2
Until: 9:00, !- Field 3
0.0, !- Field 4
Until: 17:00, !- Field 5
1.0, !- Field 6
Until: 24:00, !- Field 7
0.0; !- Field 8
DesignSpecification:OutdoorAir,
SZ DSOA SPACE1-1, !- Name
flow/person, !- Outdoor Air Method
0.00944, !- 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}
, !- Outdoor Air Flow Air Changes per Hour {1/hr}
OutdoorAirAvailSched; !- Outdoor Air Schedule Name
DesignSpecification:OutdoorAir,
SZ DSOA SPACE2-1, !- Name
flow/person, !- Outdoor Air Method
0.00944, !- 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}
, !- Outdoor Air Flow Air Changes per Hour {1/hr}
OutdoorAirAvailSched; !- Outdoor Air Schedule Name
DesignSpecification:OutdoorAir,
SZ DSOA SPACE3-1, !- Name
flow/person, !- Outdoor Air Method
0.00944, !- 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}
, !- Outdoor Air Flow Air Changes per Hour {1/hr}
OutdoorAirAvailSched; !- Outdoor Air Schedule Name
DesignSpecification:OutdoorAir,
SZ DSOA SPACE4-1, !- Name
flow/person, !- Outdoor Air Method
0.00944, !- 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}
, !- Outdoor Air Flow Air Changes per Hour {1/hr}
OutdoorAirAvailSched; !- Outdoor Air Schedule Name
DesignSpecification:OutdoorAir,
SZ DSOA SPACE5-1, !- Name
flow/person, !- Outdoor Air Method
0.00944, !- 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}
, !- Outdoor Air Flow Air Changes per Hour {1/hr}
OutdoorAirAvailSched; !- Outdoor Air Schedule Name
If Outdoor Air Schedule Name in DesignSpecification:OutdoorAir works, the outdoor air should be supplied to each zone 2 hours after the air supply fan becomes available.
However, the simulation results below show that Outdoor Air Schedule Name has no effect on OA flow rate of each zone during both sizing period and wethrer file run period.
Is this a bug?
I know how to control OA flow rate with Schedule. At the system level (AirLoop level), Minimum Outdoor Air Schedule Name in Controller:OutdoorAir works. At the zone level, Availability Schedule Name in AirTerminal:XXX works if the air terminal is dedicated for OA supply. I'm just wondering in what situation and how Outdoor Air Schedule Name in DesignSpecification:OutdoorAir works.
