`maximumFractionofOutdoorAirSchedule` lower than `minimumOutdoorAirFlowRate` on `Controller:OutdoorAir` object

[JanghyunJK]

I was debugging a model and found this weird. below is my "theory":

• it was comstock's full service restaurant model that has PSZs in dining

• this below is one of the PSZ's controller outdoor air obj:

Controller:OutdoorAir,
  Zone FullServiceRestaurant Dining A  - Story ground PSZ-AC OA System Controller, !- Name
  Zone FullServiceRestaurant Dining A  - Story ground PSZ-AC Relief Air Node, !- Relief Air Outlet Node Name
  Zone FullServiceRestaurant Dining A  - Story ground PSZ-AC Supply Inlet Node, !- Return Air Node Name
  Zone FullServiceRestaurant Dining A  - Story ground PSZ-AC Mixed Air Node, !- Mixed Air Node Name
  Zone FullServiceRestaurant Dining A  - Story ground PSZ-AC Outdoor Air Node, !- Actuator Node Name
  0.87058909070243,                       !- Minimum Outdoor Air Flow Rate {m3/s}
  1.05252208609867,                       !- Maximum Outdoor Air Flow Rate {m3/s}
  NoEconomizer,                           !- Economizer Control Type
  ModulateFlow,                           !- Economizer Control Action Type
  28,                                     !- Economizer Maximum Limit Dry-Bulb Temperature {C}
  64000,                                  !- Economizer Maximum Limit Enthalpy {J/kg}
  ,                                       !- Economizer Maximum Limit Dewpoint Temperature {C}
  ,                                       !- Electronic Enthalpy Limit Curve Name
  ,                                       !- Economizer Minimum Limit Dry-Bulb Temperature {C}
  LockoutWithCompressor,                  !- Lockout Type
  FixedMinimum,                           !- Minimum Limit Type
  Zone FullServiceRestaurant Dining A  - Story ground PSZ-AC_night_ventcycle_schedule, !- Minimum Outdoor Air Schedule Name
  ,                                       !- Minimum Fraction of Outdoor Air Schedule Name
  ems_Zone_FullServiceRestaurant_Dining_A____Story_ground_PSZ_AC_maxOASch, !- Maximum Fraction of Outdoor Air Schedule Name
  Controller Mechanical Ventilation 1,    !- Mechanical Ventilation Controller Name
  ,                                       !- Time of Day Economizer Control Schedule Name
  No,                                     !- High Humidity Control
  ,                                       !- Humidistat Control Zone Name
  1,                                      !- High Humidity Outdoor Air Flow Ratio
  Yes,                                    !- Control High Indoor Humidity Based on Outdoor Humidity Ratio
  BypassWhenWithinEconomizerLimits,       !- Heat Recovery Bypass Control Type
  InterlockedWithMechanicalCooling;       !- Economizer Operation Staging

• so from above, min OA flow rate is 0.87058909070243 m3/s. and in terms of fraction, this is 82% from max flow

• and in the same object, there's a max fraction of OA schedule field showing a schedule called ems_Zone_FullServiceRestaurant_Dining_A____Story_ground_PSZ_AC_maxOASch

• if I look further into this schedule, I see 0.7 (70%) as the maximum OA fraction value:

• so what this means is that, maximum OA fraction (70%) is lower than minimum OA fraction (82%).

• and in the simulation results, 70% OA was drawn and 82% was never reached.

• and I was thinking maybe,

  • we added like super high OA requirement for this dining which is like 82% as MIN
  • but standards has it's own implementation of 70% as MAX (probs coming from here)
  • so two are maybe not chiming well