Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
In EnergyPlus, the VAV box will try to meet the zone load, cooling or heating required to meet the thermostat set point temperature, by adjusting the air flow. If the supply air entering the VAV box is at the air loop set point, the VAV box air flow will be proportional to the load. There should be no control issues with using 70F (21.11C) for heating and 72F (22.22C) for cooling. Throttling range does not play a role in determining what load the VAV box will meet, the zone thermostat calculates the load. If there were a 2-stage HVAC where 2nd stage turned on at some higher temperature than the base set point temperature then the ZoneControl:Thermostat:StagedDualSetpoint would do that, but this thermostat is not meant for VAV systems.
You can see the Tstat temperatures using:
Output:Variable,*,Zone Thermostat Heating Setpoint Temperature,hourly; !- HVAC Average [C]
Output:Variable,*,Zone Thermostat Cooling Setpoint Temperature,hourly; !- HVAC Average [C]
and the predicted zone loads based on thermostat temperature using:
Output:Variable,*,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate,hourly; !- HVAC Average [W]
Output:Variable,*,Zone Predicted Sensible Load to Heating Setpoint Heat Transfer Rate,hourly; !- HVAC Average [W]
Output:Variable,*,Zone Predicted Sensible Load to Cooling Setpoint Heat Transfer Rate,hourly; !- HVAC Average [W]
and the resulting energy to each zone using:
Output:Variable,*,Zone Air System Sensible Heating Rate,hourly; !- HVAC Average [W]
Output:Variable,*,Zone Air System Sensible Cooling Rate,hourly; !- HVAC Average [W]
and various VAV damper results using:
Output:Variable,*,Zone Air Terminal VAV Damper Position,hourly; !- HVAC Average []
Output:Variable,*,Zone Air Terminal Minimum Air Flow Fraction,hourly; !- HVAC Average []
Output:Variable,*,Zone Air Terminal Outdoor Air Volume Flow Rate,hourly; !- HVAC Average [m3/s]
