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Re: [EnergyPlus_Support] Maximum humidity control
There are several things going on here.
1. DXSystem:AirLoop does not do active humidity control. So this system will
not work as described.
2. Only chilled water coils (via the CONTROLLER:SIMPLE) and
FURNACE:BLOWTHRU:HEATCOOL or UNITARYSYSTEM:BLOWTHRU:HEATCOOL can provide
controlled dehumidification.
3. Dual humidity setpoints are not directly supported. If there is
documentation that implies this, please point me to the reference so this can
be clarified.
4. In the MIN/MAX HUM set point managers, the setpoint schedule is no longer
an active field (see the error messages at the end of the err file in v1.2.1).
Each setpoint manager works to meet the humidistat setpoint for the referenced
zone, which is "Ideal Humidity Sch" for all three zones. So the humidifier is
working to provide 50% RH at all times.
Mike
On 26 Oct 2004, at 20:38, Rahul Chillar wrote:
>
> If Coil:Water:Cooling serves your purpose, it should act as a good
> dehumidifier, and has all easy autosizable inputs.
>
> Rahul Chillar
>
> Sam Roose <sam@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Just reiterating a problem from a few weeks ago, with regards to the
> "base_case2_economizer" file in the Problem Submittals/ Sam Roose folder.
>
> The maximum humidity in this file sometimes gets to 80% and beyond, well
> above the desired 56% (when the sent file is run without an economizer) and up
> to 93-94% with an economizer.
>
> I see the new version of EnergyPlus has a dual setpoint available for
> humidity, which is great. However, the documentation states this input is to be
> used with plant loop (my file Doesn't have a plant loop) and that temperature is
> the recommended control variable, so I am not sure if I am on the right track
> with that. I have seen no significant change in maximum humidity figures using
> the latest version (version 1.2.1) as yet.
>
> I do not have any specific dehumidification equipment in the file, rather a DX
> coil which has the dual purpose of cooling and dehumidifying. As cooling is
> being performed adequately, it could just be that dehumidification is of low
> priority or that there is nothing to say that the DX coil is a dehumidifying
> device as well. The cooling coil is huge so it should do the job. Can I split
> its priorities or something? Is this as close as the humidity control is likely
> to get?
>
> This model is operating normally when compared with some others, so I really
> appreciate your help thus far. Thanks in advance,
>
> Sam
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
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> http://groups.yahoo.com/group/EnergyPlus_Support/
>
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>
> Thanks
> Rahul Chillar
> Grad Student
> Building Systems lab
> Univ Of Illinois Urbana Champaign
>
>
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> The primary EnergyPlus web site is found at:
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>
> The group web site is:
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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