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Re: [EnergyPlus_Support] Re: humidity control
Adding a humidistat will have no effect unless the appropriate HVAC
equipment is present and activated.
For dehumidification, the only equipment which currently responds to
a humidistat is FURNACE:BLOWTHRU:HEATCOOL and
UNITARYSYSTEM:BLOWTHRU:HEATCOOL with "high humidity control"=yes.
See the FurnaceWithDXSystemRHcontrol.idf example file.
For humidification, you also need a SET POINT MANAGER:SINGLE ZONE MIN
HUM and a HUMIDIFIER:STEAM:ELECTRICAL object. See the CVRhMinHum.idf
example file.
Mike
On 2 Oct 2003, at 15:25, HSIEH Chun-Ming wrote:
> Hello,
> I am trying on simulating the Zone Control:humidistat. But, ....
> Except the Zone/Sys Moisture Load Rate Predicted has some change,
> other outputs including Air Humidity Ratio and Zone Air Relative
> Humidity were exactly the same as the output of the file that doesnt
> have the Humidistat. Is there any example talking about the
> Humidistat? Thank you very much.
>
> Chunming
>
> donbshireyiii wrote:
>
> > 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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>
> --
>
> ------------------------------------------------------
> HSIEH Chun-Ming, Doctor Student
> Hanaki & Aramaki Laboratory,
> Department of Urban and Environmental Engineering,
> Graduate School of Engineering,
> The University of Tokyo
> Tel: +81-3-5841-6248
> Fax: +81-3-5841-8530
> Mobile: +81-90-9385-8293
> ------------------------------------------------------
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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