[EnergyPlus_Support] Re: Variable Speed Fan

["Elreq" <tolteca33@xxxxxxxxx>]

Dear Forum

I still cannot make the variable fan to run at different speeds. Does
anybody has an example where this happens? Maybe if I take a look I
can see what I am missing.

Regards

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jvd2pe" <jvd2pe@...> wrote:
>
> Dear Elreq,
> 
> Assuming that you are using one of the constant volume fan objects....
> 
> Constant volume and constant pressure = constant power.
> 
> Normally, the variation in outdoor air is accomplished by a mixing box
> ("Mixer" object in E+), which just adjusts the ratio of outdoor and
> return airflows.
> 
> If you are using a variable volume fan, something is forcing th fan to
> remain at constant volume.
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elreq" <tolteca33@> wrote:
> >
> > Thanks for the recommendation but I obviously read all this. 
> > 
> > Now I have a big question because I have created a schedule for the
> > minimum outside air flow, depending on the occupancy, and in the
> > results it clearly shows that the air changes per hour on each zone is
> > not constant anymore, being higher in the hours of occupancy, but the
> > supply fan, that is supposed to provide this outside air, is always
> > running at the same power. So I dont know how is possible that the air
> > flow is changing but the fan is always running at the same speed.
> > 
> > Any suggestions greatly appreciated.
> > 
> > Santiago.
> > 
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@>
> > wrote:
> > >
> > > Dear Elreq,
> > > I recommend that you review the Input Output Reference, starting at
> > > page  1162.  Several fans are discussed.  In short:
> > > Fan:Simple:Const Volume is a constant volume, continuous
operation fan
> > > which can be turned on and off via a schedule.
> > > Fan:Simple:OnOff is similar to the one above, but it cycles
itself on
> > > and off as required by its thermostat ... all during the scheduled
> > > operation period.  This is a typical mode of operation for a home
> > furnace.
> > > Fan:Simple:Variable Volume runs continuously during the Schedule
> > > period, but varies its volume to meet the heating or cooling demand.
> > > 
> > > I hope that this is helpful!
> > > 
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elreq" <tolteca33@>
wrote:
> > > >
> > > > Dear Forum,
> > > > 
> > > >  I am simulating a typical house with balanced ventilation and
> > > > baseboard heating units. I want that the supply fan of the Air
Loop
> > > > has three different speeds, so I introduce the fan coefficients
> > > > mentioned in the input output reference that correspond to the
> > > > variable speed motor. The problem is that the fan is constant
> all the
> > > > time at a constant speed. Could somebody tell me how to make
it work
> > > > as a variable speed fan?
> > > > 
> > > > Many thanks.
> > > >
> > >
> >
>



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