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Re: [EnergyPlus_Support] Control Node Setup



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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> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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