[EnergyPlus_Support] Re: humidity control

["donbshireyiii" <shirey@xxxxxxxxxxxxxxxxxx>]

As stated previously in this forum, we are aware of this issue 
and a model will be added later this year to account for latent 
degradation of cycling coils.  It will be included in the next major 
release of EnergyPlus (Spring 2004).

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Edward Lyon"
<eglyon@s...> 
wrote:
> I am not sure that I would trust the results of a humidistat setting
> when running a DX cooling coil system.  The humidistat can probably 
make
> the cooling coil operate, but the part load operation of the DX
coil 
is
> currently not calculating a proper SHR correction for part load
> operation.  If you were to run a simple model and double the size
of 
a
> DX cooling coil, you would see that there is more dehumidification 
under
> part load conditions with the larger unit.  This is counter to 
observed
> field performance of real DX equipment.  Your model probably over
> dehumidifies the space with part-load cooling and consequently never
> trips the humidistat operation when you most need it. Consequently,
> until the DX cooling model is modified, I would not trust either the
> calculated interior conditions or the energy consumption of an added
> humidistat control used with DX cooling.
> 
> Ned Lyon
> 
> Senior Staff Engineer
> Simpson Gumpertz & Heger Inc.
> 
> 41 Seyon Street
> Building #1, Suite 500
> Waltham, MA  02453
> 
> Phone:  781-907-9000
> Fax:  781-907-9009
> 
> 
> >>> shirey@a... 7/31/2003 8:50:49 AM >>>
> Yes the DX cooling coil responds to the humidistat.  Look at the 
> documentation for the object UNITARYSYSTEM:BLOWTHRU:HEATCOOL or 
> FURNACE:BLOWTHRU:HEATCOOL. Look at the fields related to "high 
> humidity control".
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "zhaicq98" 
<chaoqinz@a...> 
> wrote:
> > Mike,
> > 
> > Does the DX cooling coil respond to the humidistat? I compared
two 
> > files, one with humidistat object, another one without
humidistat. 
> > But the output of indoor air condition and energy consumption is 
> > exactly the same. 
> > 
> > Thanks,
> > Chaoqin
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> > <mjwitte@g...> wrote:
> > > Yes, your understanding of the thermostat is correct.
> > > 
> > > Also, the desiccant dehumidifier does not currently repond to 
the 
> > > humidistat.  It controls to a fixed leaving humidity ratio 
> > specified 
> > > in the desiccant object.
> > > 
> > > Mike
> > > 
> > >
> 
> 
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