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[EnergyPlus_Support] Re: Control Node Setup
Thanks for all the help.
John.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@...> wrote:
>
> Since you have 2 reheat coils, I assume that they are part of a
terminal unit
> such as SINGLE DUCT:CONST VOLUME:REHEAT or SINGLE
DUCT:VAV:REHEAT. These
> components have the reheat controls built into the terminal unit
and do not
> require a set point manager or a CONTROLLER:SIMPLE object. SET
POINT
> MANAGER:SINGLE ZONE REHEAT is used to control coils in the main
branch of an
> air loop, not in terminal units.
>
> To control dehumidification, the cooling coil requires both a
temperature set
> point manager and a Set Point Manager:Single Zone Max Hum (as
mentioned below)
> to override when humidity control is required.
>
> If this system is serving 2 zones, SET POINT MANAGER:SINGLE ZONE
COOLING will
> not work, because it will control the cooling coil for only the
single zone it
> is attached to. SET POINT MANAGER:WARMEST may be better for this
application.
>
> Mike
>
>
> On 28 Feb 2006 at 11:27, Richard Raustad wrote:
>
> > Try using the Set Point Manager:Single Zone Max Hum as the set
point
> > manager for the cooling coil. Use a Humidistat in one zone to
control
> > the steam humidifier at some minimum zone humidity set point and
a
> > humidistat in the other zone to control the cooling coil to some
maximum
> > zone humidity set point. You will also need to specify
TEMPandHUMRAT as
> > the control variable for the CONTROLLER:SIMPLE used for the
cooling
> > coil. You should also be using a Set Point Manager:Single Zone
Min Hum
> > with the steam humidifier.
> >
> > civilnug wrote:
> >
> > > Hi All,
> > >
> > > I have a fixed flow system feeding two zones, on the air loop
there's
> > > a cooling coil and a supply fan followed by a steam
humidifier, I then
> > > have two separate reheat coils serving the two zones. In these
zones I
> > > want to control both the temperature and the humidity.
> > >
> > > I have a CONTROLLER:SIMPLE for each of the coils (1 cooling, 2
> > > reheats) and SET POINT MANAGER:SINGLE ZONE REHEAT for the
reheats and
> > > SET POINT MANAGER:SINGLE ZONE COOLING for the cooling coil.
> > >
> > > I'm able to get control of the RH or the temperature in the
zones but
> > > not both at the same time.
> > >
> > > Could my control nodes be the source of the problem?
> > >
> > > Regards,
> > > John.
> > >
> > >
> > >
> > >
> > >
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> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@...
>
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