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[EnergyPlus_Support] Re: AFN - Nat Vent Too much during cold / warm days
'ZoneLevel' instead of 'Constant', that's the ticket! thanks, Sam. (yeah, I had changed the dT to be smaller previously, but just at Zone Level and was seeing no improvement)
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "samuel.brunswick" <samuel.brunswick@...> wrote:
>
> Hi Jean,
>
> You may be seeing high ACH because your surface control is set to 'Constant'. Constant means that the window is open all the way (ie open factor = 1 or no modulation), whenver the availability schedule is non-zero. If you want the window open area to modulate based on dT you have two options. First, if you set the surface control type to 'ZoneLevel' it will modulate the window open area based on the modulation logic described in your AirflowNetwork:MultiZone:Zone object. Second, if you set the surface control type to 'Temperature' it will follow the modulation logic described in your AirflowNetwork:MultiZone:Surface object. You might have to adjust your dT's for minimum and maximum opening factors (for instance, 15degC for minimum venting factor may be a little large).
>
> It might be useful to output the open factor for the window so you can see whether it is modulating or not:
>
> Output:Variable,
> *, !- Key Value
> Window/Door Venting Opening Factor , !- Variable Name
> hourly; !- Reporting Frequency
>
> Hope this helps,
>
> Sam
>
> --- 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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