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[EnergyPlus_Support] Re: AirTerminal:SingleDuct:VAV:NoReheat
I have verified that i cannot create a AirTerminal:Singleduct:VAV:NoReheat to get zone temperatures in between 20/25 ºC. I have to define a controller to the heating and cooling coils (both water) of the air handeling unit then that makes me define setpoint air temperatures of the air entering the zone.
Even if i delete the heat coil controller, the zone temperature in winter does not reach 20ºC.
Basically I want to simulate an Air Handeling Unit with pre-heat, cooling and heating coil (all water), mixing box and a variable fan. No terminal reheating.
What option must i choose?
Air:Terminal:SingleDuct:Uncontrolled?? if i choose this i think i cannot define de airBranch;
Or should i look into NaturalVentilationAndDuctLeakage for the system? but this does not allow the choise of a variable fan.
Thank-you
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Sounds like you need to include a heating coil in the air loop when
> using AirTerminal:Singleduct:VAV:NoReheat. I you already have one then
> you are not controlling it correctly or the zone loads are so diverse
> that some will wind up below 20C. This can sometimes be corrected by
> balancing the air loop flow rates to each zone (i.e., giving more flow
> to colder zones and less flow to warmer zones).
>
> The supply air reset schedule is used to minimize heating energy in
> winter. If you kept the same cold supply air temperature all year
> around, the heating coils would have to work harder in the winter.
>
> On 3/24/2011 5:47 AM, vieira.jose99 wrote:
> >
> > AirTerminal:SingleDuct:VAV:NoReheat
> >
> > I have set up everything, but I want the mean air temperature to be in
> > between 20 and 25ºC. But this does not happen. I have the thermostats
> > configured to be 20/25ºC.
> > The mean air temperature just stays a few degrees above the outside
> > air temperature.
> > I have the coils, boiler and chiller on autosize.
> >
> > When I configure the same setup to AirTerminal:SingleDuct:VAV:Reheat
> > with reheat coils on autosize, I get it to be in between 20 and 25ºC.
> >
> > Any advice?
> >
> > Also....can someone explain what is the "Seasonal Reset Supply Air
> > Temp Sch" for? I have read the inputoutput, but still cannot
> > understand the basics of this schedule.
> >
> > thank-you
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
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