[EnergyPlus_Support] Re: Sizing warning message on temperature difference

["Jean marais" <jeannieboef@xxxxxxxxx>]

This is happening during your sizing day. So I think the max temp of your zone is only reaching 20 deg C during this day. Run the simulation for the sizing period to see.

  SimulationControl,
    Yes,                     !- Do Zone Sizing Calculation
    Yes,                     !- Do System Sizing Calculation
    Yes,                     !- Do Plant Sizing Calculation
    Yes,                      !- Run Simulation for Sizing Periods
    No;                     !- Run Simulation for Weather File Run Periods

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "patrick_bivona" <patrick.bivona@...> wrote:
>
> Hi Jean,
> 
> I am indeed using a VAV (through the HVACTemplate objects) but I've disabled reheat (Reheat Coil Type = None). The zone heating setpoint is 5degC anyway.
> 
> Patrick
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jeannieboef@" <jeannieboef@> wrote:
> >
> > You are using a vav with reheat, right. In clg mode it will reheat to  
> > the zone htg setpoint not the zone clg setpoint.
> > 
> > Sent from my iPhone (excuse the brevity)
> > Mit freundlichen Grü�en
> > 
> > i. A.
> > Jean Marais
> > B.Eng (Mech)
> > LEED Accredited Professional
> > Building Energy Modeling with DesignBuilder and EnergyPlus
> > 
> > b.i.g. bechtold
> > INGENIEURGESELLSCHAFT MBH
> > KeithstraÃ?e 6
> > 10787 Berlin
> > Tel.   +49 30 6706662-23
> > Fax  +49 30 6706662-18
> > Marais.Jean@
> > www.designbuilder-big.com
> > www.big-gruppe.com/tga
> > Firmensitz: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB  
> > 112242 B
> > Geschäftsführer: Bernd Bechtold, Tino Laupitz, Carsten Teichmann
> > 
> > "The LEED® (Leadership in Energy and Environmental Design) Green  
> > Building
> > Rating System is the nationally accepted benchmark for the design,  
> > construction,
> > and operation of high performance green buildings."
> > Other LEED descriptive copy may be found on the USGBC Web site: http://www.usgbc.org/leed
> > 
> > Official Reseller for DesignBuilder in Germany and Austria
> > 
> > 
> > 
> > On 12.06.2013, at 03:37, Patrick Bivona <patrick.bivona@>  
> > wrote:
> > 
> > > Hi,
> > >
> > > I'm getting this warning message after a run:
> > >
> > >    ** Warning ** SizeZoneEquipment: Supply air temperature  
> > > (calculated) within 5C of zone setpoint temperature
> > >    **   ~~~   ** ...check zone thermostat set point and design  
> > > supply air temperatures
> > >    **   ~~~   ** ...zone = "ZONE 1F ENTRANCE WEST" first occurrence  
> > > during cooling load calculations
> > >    **   ~~~   ** ...predicted zone cooling load = -863.19 W
> > >    **   ~~~   ** ...zone temperature            = 20.00 C
> > >    **   ~~~   ** ...supply air temperature      = 16.00 C
> > >    **   ~~~   ** ...temperature difference      = -4.00000 C
> > >    **   ~~~   ** ...calculated mass flow rate   = 0.21163 kg/s
> > >
> > > I understand the general purpose of the temperature difference  
> > > check: avoid high flow rates.
> > > What I don't understand is why the "zone temperature" is reported as  
> > > being 20 degC, when my thermostat cooling setpoint is 24 degC.
> > >
> > > Am I wrong in assuming that "zone temp" should be the cooling  
> > > setpoint? If so, why recommend to check the zone thermostat in the  
> > > warning message?
> > >
> > > I'm confused!
> > >
> > > Thanks in advanced for your help,
> > > Patrick Bivona
> > >
> > >
> >
>




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