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I plotted out the hourly "Zone Air CO2 Concentration" output and noticed that the CO2 concentration varies by season, even though the schedules I have do not.

Does anyone know the reason why this happens? It's a typical VAV reheat system. My zone has the People object with

0.0000000382, !- Carbon Dioxide Generation Rate {m3/s-W}

ZoneAirContaminantBalance,
Yes,                     !- Carbon Dioxide Concentration
Outdoor CO2 Schedule;    !- Outdoor Carbon Dioxide Schedule Name

Schedule:Compact,
Outdoor CO2 Schedule,    !- Name
Any Number,              !- Schedule Type Limits Name
Through: 12/31,          !- Field 1
For: AllDays,            !- Field 2
Until: 24:00,400.0;      !- Field 3

I plotted out the hourly "Zone Air CO2 Concentration" output and noticed that the CO2 concentration varies by season, even though the schedules I have do not.

Does anyone know the reason why this happens? It's a typical VAV reheat system. My zone has the People object with

0.0000000382, !- Carbon Dioxide Generation Rate {m3/s-W}

ZoneAirContaminantBalance,
Yes,                     !- Carbon Dioxide Concentration
Outdoor CO2 Schedule;    !- Outdoor Carbon Dioxide Schedule Name

Schedule:Compact,
Outdoor CO2 Schedule,    !- Name
Any Number,              !- Schedule Type Limits Name
Through: 12/31,          !- Field 1
For: AllDays,            !- Field 2
Until: 24:00,400.0;      !- Field 3

I plotted out the hourly "Zone Air CO2 Concentration" output and noticed that the CO2 concentration varies by season, even though the schedules I have do not.

Does anyone know the reason why this happens? It's a typical VAV reheat system. My zone has the People object with

0.0000000382, !- Carbon Dioxide Generation Rate {m3/s-W}

ZoneAirContaminantBalance,
Yes,                     !- Carbon Dioxide Concentration
Outdoor CO2 Schedule;    !- Outdoor Carbon Dioxide Schedule Name

Schedule:Compact,
Outdoor CO2 Schedule,    !- Name
Any Number,              !- Schedule Type Limits Name
Through: 12/31,          !- Field 1
For: AllDays,            !- Field 2
Until: 24:00,400.0;      !- Field 3

I plotted out the hourly "Zone Air CO2 Concentration" output and noticed that the CO2 concentration varies by season, even though the schedules I have do not.

Does anyone know the reason why this happens? It's a typical VAV reheat system. My zone has the People object with

0.0000000382, !- Carbon Dioxide Generation Rate {m3/s-W}

ZoneAirContaminantBalance,
Yes,                     !- Carbon Dioxide Concentration
Outdoor CO2 Schedule;    !- Outdoor Carbon Dioxide Schedule Name

Schedule:Compact,
Outdoor CO2 Schedule,    !- Name
Any Number,              !- Schedule Type Limits Name
Through: 12/31,          !- Field 1
For: AllDays,            !- Field 2
Until: 24:00,400.0;      !- Field 3

System outdoor air.