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If you have an HVAC system defined in EnergyPlus, you should have access to the following output variables:

  • Output:Variable,*,System Node Current Density,hourly; !- HVAC Average [kg/m3]
  • Output:Variable,*,System Node Specific Heat,hourly; !- HVAC Average [J/kg-K]

You will need to find the name of the zone air node that you are interested in, then replace the "*" in the two examples above with that zone air node name (or whatever specific node in the HVAC system you are interested in).

The "Site Outdoor Air Density" will tell you the air density of outdoor air from the EPW weather file.

The ZoneCapacitanceMultiplier:ResearchSpecial object is used to multiply the total sensible heat storage capacity of a zone, not to set the zone air's specific heat.

If you have an HVAC system defined in EnergyPlus, you should have access to the following output variables:

  • Output:Variable,*,System Node Current Density,hourly; !- HVAC Average [kg/m3]
  • Output:Variable,*,System Node Specific Heat,hourly; !- HVAC Average [J/kg-K]

You will need to find the name of the zone air node node that you are interested in, then replace the "*" in the two examples above with that zone air node name (or whatever specific node in the HVAC system you are interested in).

The "Site Outdoor Air Density" will tell you the air density of outdoor air from the EPW weather file.

The ZoneCapacitanceMultiplier:ResearchSpecial object is used to multiply the total sensible heat storage capacity of a zone, not to set the zone air's specific heat.