Why the AvailabilityManager:NightVentilation can not change the fan operation mode
I want to use ZonePackaged: HeatPump to supply the conditioned air in the daytime and induce the outdoor air at night. I followed the "5ZoneNightVent3" to use the availability manager and set the Fan:SystemModel.
After the simulation, the AvailabilityManager:NightVentilation works, so that the fan can work at night to supply outdoor air. When I can change the ventilation temperature difference, the low limit temperature in the AvailabilityManager:NightVentilation, they work properly.
But the problems are: (1) The fan's power at night is the same as the power at daytime, which means the 67 pa (Night Ventilation Mode Pressure Rise) set in Fan:SystemModel does not work; (2) the night venting flow fraction set in AvailabilityManager:NightVentilation does not work, which I cannot change the desired airflow rate at night. I have to say I also changed the two parameters mentioned above in the E+ example, they work properly. But I am stuck in my own case. Could anyone knows how to solve this problem? Thank you all.
AvailabilityManager:NightVentilation,
NV Avail, !- Name
NightVentSched, !- Applicability Schedule Name
FanAvailSched, !- Fan Schedule Name
VentTempSched, !- Ventilation Temperature Schedule Name
3, !- Ventilation Temperature Difference {deltaC}
18, !- Ventilation Temperature Low Limit {C}
2, !- Night Venting Flow Fraction
Room; !- Control Zone Name
Fan:SystemModel,
Room PTHP Supply Fan, !- Name
FanAvailSched, !- Availability Schedule Name
Room PTHP Heating Coil Outlet, !- Air Inlet Node Name
Room PTHP Supply Fan Outlet, !- Air Outlet Node Name
autosize, !- Design Maximum Air Flow Rate {m3/s}
Continuous, !- Speed Control Method
0.2, !- Electric Power Minimum Flow Rate Fraction
600, !- Design Pressure Rise {Pa}
0.9, !- Motor Efficiency
1, !- Motor In Air Stream Fraction
autosize, !- Design Electric Power Consumption {W}
TotalEfficiencyAndPressure, !- Design Power Sizing Method
, !- Electric Power Per Unit Flow Rate {W/(m3/s)}
, !- Electric Power Per Unit Flow Rate Per Unit Pressure {W/((m3/s)-Pa)}
0.7, !- Fan Total Efficiency
VAV Fan Curve, !- Electric Power Function of Flow Fraction Curve Name
67, !- Night Ventilation Mode Pressure Rise {Pa}
, !- Night Ventilation Mode Flow Fraction
, !- Motor Loss Zone Name
, !- Motor Loss Radiative Fraction
General, !- End-Use Subcategory
1; !- Number of Speeds
ZoneHVAC:PackagedTerminalHeatPump,
Room PTHP, !- Name
, !- Availability Schedule Name
Room PTHP Return, !- Air Inlet Node Name
Room PTHP Supply Inlet, !- Air Outlet Node Name
OutdoorAir:Mixer, !- Outdoor Air Mixer Object Type
Room PTHP OA Mixing Box, !- Outdoor Air Mixer Name
autosize, !- Cooling Supply Air Flow Rate {m3/s}
autosize, !- Heating Supply Air Flow Rate {m3/s}
, !- No Load Supply Air Flow Rate {m3/s}
autosize, !- Cooling Outdoor Air Flow Rate {m3/s}
autosize, !- Heating Outdoor Air Flow Rate {m3/s}
autosize, !- No Load Outdoor Air Flow Rate {m3/s}
Fan:SystemModel, !- Supply Air Fan Object Type
Room PTHP Supply Fan, !- Supply Air Fan Name
Coil:Heating:DX:SingleSpeed, !- Heating Coil Object Type
Room PTHP Heating Coil, !- Heating Coil Name
0.001, !- Heating Convergence Tolerance {dimensionless}
Coil:Cooling:DX:SingleSpeed, !- Cooling Coil Object Type
Room PTHP Cooling Coil, !- Cooling Coil Name
0.001, !- Cooling Convergence Tolerance {dimensionless}
Coil:Heating:Electric, !- Supplemental Heating Coil Object ...
