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[EnergyPlus_Support] Re: AFN - Nat Vent Too much during cold / warm days

Thanks for the reply,
I understood that the heirachy of the system is such that surface overides zone specifications...but I assumed that the Ventilation Control Mode = Constant is similar to saying "autosize from zone level inputs". I am implementing the change.

Thanks again.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "zeynep" <arsanzeynep@...> wrote:
>
> Hi,
> 
> 1. Since you select "constant" on the surface level, there is always air flow on your outer openings (as much as your venting availability schedules permits). If you want to consider temperature modulation of air flow, you should set vent. control mode on surface level as temperature. Secondly, you may work on crack factor on this level.
> 
> 2. You should work on some parameters on DetailedOpening which are related to when the openings are closed. 
> 
> 3. Also consider your cracks' conditons on surface level.
> 
> Hope to help you, 
> 
> Zeynep
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@> wrote:
> >
> > hi All, I'm seeing large air change rates (10-20 ACH) when the outdoor temp is at 7 degC and indoor temp is at 21 degC. The "Zone" level control is set for dT of 5 degC and the "surface" level control is set for "constant". See below...please advise.
> > 
> >   AirflowNetwork:MultiZone:Zone,
> >     118129,                  !- Zone Name
> >     Temperature,             !- Ventilation Control Mode
> >     20001,                   !- Ventilation Control Zone Temperature Setpoint Schedule Name
> >     0,                       !- Minimum Venting Open Factor {dimensionless}
> >     0,                        !- Indoor and Outdoor Temperature Difference Lower Limit For Maximum Venting Open Factor {deltaC}
> >     5,                       !- Indoor and Outdoor Temperature Difference Upper Limit for Minimun Venting Open Factor {deltaC}
> >     ,                        !- Indoor and Outdoor Enthalpy Difference Lower Limit For Maximum Venting Open Factor {deltaJ/kg}
> >     ,                        !- Indoor and Outdoor Enthalpy Difference Upper Limit for Minimun Venting Open Factor {deltaJ/kg}
> >     12345;                   !- Venting Availability Schedule Name
> > 
> > AirflowNetwork:MultiZone:Surface,
> >     P_118129_1_0_0_0_0_0_Win,!- Surface Name
> >     P_118129_1_0_0_0_0_0_Win,!- Leakage Component Name
> >     P_118129_1_0_0_0_0_0_Win,!- External Node Name
> >     1,                       !- Window/Door Opening Factor, or Crack Factor {dimensionless}
> >     Constant,                !- Ventilation Control Mode
> >     20001,                   !- Ventilation Control Zone Temperature Setpoint Schedule Name
> >     .01,                     !- Minimum Venting Open Factor {dimensionless}
> >     0,                       !- Indoor and Outdoor Temperature Difference Lower Limit For Maximum Venting Open Factor {deltaC}
> >     15,                      !- Indoor and Outdoor Temperature Difference Upper Limit for Minimun Venting Open Factor {deltaC}
> >     ,                        !- Indoor and Outdoor Enthalpy Difference Lower Limit For Maximum Venting Open Factor {deltaJ/kg}
> >     ,                        !- Indoor and Outdoor Enthalpy Difference Upper Limit for Minimun Venting Open Factor {deltaJ/kg}
> >     2;                       !- Venting Availability Schedule Name
> >
>




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