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[EnergyPlus_Support] Re: Ghost Fans?



Actually, I'm using the Los Angeles weather file.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Don Shirey <shirey@...> wrote:
>
> Which weather file you are using?
> 
> Looking at the IDF, I assumed you were using Baltimore Maryland TMY2.  
> But when I use that weather file, I don't get the same answers as you 
> show in your spreadsheet.
> 
> 
> Kristin Field wrote:
> 
> >Hi, I'm having trouble with a residence I'm modeling in EP.  It has DX
> >cooling and furnace heating, with OA autosized and no economizer. 
> >Currently, heating is enabled all year, and cooling is only enabled
> >July-September.  Fans are enabled all year.  Natural ventilation is
> >also modeled in a ventilation object (not airflownetwork).  Controls
> >of cycfancyccoil and cycfancyccomp are used.
> >
> >The problem is that, after reviewing the .csv with report variables of
> >fan consumption, cooling coil consumption, heating coil consumption,
> >and natural ventilation, I have found several timesteps where the fan
> >cycles on w/o either coil - and not just for one timestep, but for
> >several in a row.  The number of hours this happens is different in
> >the same model with and without natural ventilation.  I think this is
> >probably skewing my results as to the effect of natural ventilation on
> >consumption.  Even forgetting about the natural ventilation component,
> >I would think this would give me elevated fan energy results if the
> >fan isn't really supposed to cycle on like this.
> >
> >Does anyone know why the fans would come on without a coil also coming
> >on, since there's no economizer?  From the documentation, I thought
> >coils and fans were supposed to cycle together (which I interpreted to
> >mean at the same times).
> >
> >I will upload my .idf to the files section, along with a spreadsheet
> >that shows these fan, coil, and NV results that have puzzled me.
> >
> >Help appreciated!
> >
> >Thanks,
> >Kristin
> >  
> >
>




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