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[EnergyPlus_Support] Re: Sizing warning message on temperature difference
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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