[EnergyPlus_Support] Re: Modeling an air handler with a relief fan

["tjutw" <tjutw@xxxxxxxxx>]

You can include a relief fan in the outside air system equipment. The
 relief fan inlet node is the relief air stream node in the "outside
air mixer" Object.  
  
Given the airflow rate of this relief fan is much less than a return
fan, you can just decrease the fan pressure from the energy use
prospective.   

Hope it helps,

Tj Ywh


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@...>
wrote:
>
> Can anyone answer this question?
> 
> Thanks!
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@>
> wrote:
> >
> > Dear EPlus Forum,
> > 
> > I want to model a relief fan working in concert with an air handler. 
> > This is commonly operated like a variable speed exhaust fan which is
> > placed in the relief airstream of an outdoor air mixer and removes
> > excess economizer air. 
> > As a result the fan heat does not go to the return air stream, and the
> > airflow rate is often much less than a return fan, since some of the
> > air exits the building through cracks.
> > I could not find an example or previous forum discussion which shows
> > this.  Can anyone give some guidance about how do model this?
> > 
> > Thanks!
> >
>



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