Re: [EnergyPlus_Support] Ghost Fans?

[Don Shirey <shirey@xxxxxxxxxxxx>]

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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