[EnergyPlus_Support] Re: zone air humidity ratio

["amyquartette" <amyquartette@xxxxxxxxxxx>]

It's already default NoOutdoorAir. When there is no OA, where can the extra water vapor come from?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> Field 11: Outdoor Air
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "amyquartette" <amyquartette@> wrote:
> >
> > Hi Dr. Li,
> > 
> > thanks for your reply. I'm using IdealLoadsAirSystem of the version 6.0. But actually the system I'd like to have is without Outdoor Air. where can I specify that? Maybe with the zoneHVAD:EquipmentConnections of the expanded file? And how?
> > 
> > Regards,
> > Amy
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
> > >
> > > 
> > > The current, Version 7.0, IdealLoadsAirSsystem is quite different from the original PurchasedAir system. ZoneHVAC:IdealLoadsAirSystem,
> > > Zone1 Ideal Loads System, !- Name
> > > AlwaysOn, !- Availability Schedule Name
> > > Zone1 Ideal Loads Supply Node, !- Zone Supply Air Node Name
> > > Zone1 Ideal Loads Return Node, ! Zone Exhaust Air Node Name
> > > 50, !- Maximum Heating Supply Air Temperature {C}
> > > 13, !- Minimum Cooling Supply Air Temperature {C}
> > > 0.0156, !- Maximum Heating Supply Air Humidity Ratio {kg-H2O/kg-air}
> > > 0.0077, !- Minimum Cooling Supply Air Humidity Ratio {kg-H2O/kg-air}
> > > NoLimit, !- Heating Limit
> > > , !- Maximum Heating Air Flow Rate {m3/s}
> > > , !- Maximum Sensible Heating Capacity {W}
> > > NoLimit, !- Cooling Limit
> > > , !- Maximum Cooling Air Flow Rate {m3/s}
> > > , !- Maximum Total Cooling Capacity {W}
> > > , !- Heating Availability Schedule Name
> > > , !- Cooling Availability Schedule Name
> > > ConstantSensibleHeatRatio, !- Dehumidification Control Type
> > > 0.7, !- Cooling Sensible Heat Ratio
> > > None, !- Humidification Control Type
> > > Office OA Specification, !- Design Specification Outdoor Air Object Name
> > > Zone1 Ideal Loads OA Inlet Node, !- Outdoor Air Inlet Node Name
> > > None, !- Demand Controlled Ventilation Type
> > > NoEconomizer, !- Outdoor Air Economizer Type
> > > Enthalpy, !- Heat Recovery Type
> > > 0.70, !- Sensible Heat Recovery Effectiveness
> > > 0.65; !- Latent Heat Recovery Effectiveness Unless you know what you have entered or what the HVACtemplate has expanded for you, you can get many different results.  The zone sizing and OA mixer are now  in the same object. This is the reason why I have suggested to looking at the basic report variables to confirm what the system is actualy doing and compare with the know physic rules. It is still possible to make it behave like the old simple PurchasedIar system with the default settings..  Dr. Li   
> > >  To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > > From: jeannieboef@
> > > Date: Tue, 5 Jun 2012 13:01:50 +0000
> > > Subject: [EnergyPlus_Support] Re: zone air humidity ratio
> > > 
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> > >       IdealLoads HVAC
> > > 
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> > > 
> > > I think IdealLoads HVAC does "blend" air.
> > > 
> > > 
> > > 
> > > You specify 
> > > 
> > > - Air delivery absolute humidity 
> > > 
> > > - Temperature Setpoint for the zone
> > > 
> > > - Air delivery temperature to the zone 
> > > 
> > > - ODA fresh air amount
> > > 
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> > > 
> > > e+ can auto calculate
> > > 
> > > - Total supply volume (fresh air + recirculated air) to meet the zone loads and maintain the zone temperature setpoint.
> > >
> >
>




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