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Re: [EnergyPlus_Support] Getting humidification to work
Thanks for the reply, Richard.
I have since used a humidistat for the main zone in my building and set it
to 50% (minimum desired humidity). I saw some pretty weird results:
Changing the humidistat allowed the gallery zone to maintain minimum
humidity and ideal 19-21 degree temperatures, until the 10 April where the
humidity and temperature drop to ~30% and 19 degrees respectively for no
apparent reason. The minor zones drop well below ideal temperature after the
10th of April. Half way through November the temperature and humidity
returns to the situation pre 10th of April. Energy use also appears normal
before April the 10th, then increases sharply. From what I can tell, this is
not a schedule issue. Any suggestion as to why this occurs is greatly
appreciated.
The output from the humidifier is still around 600W max despite it Having a
rated power of 21000W.
I have reloaded the file to the ³Sam Roose² folder for inspection, to be
used with a Wellington NZ weather file.
Also, if there is, or in future will be, any way to treat humidity as
temperature is treated in terms of applying a deadband to the allowable
humidity range and having multizone control I would love to hear about it.
While I¹m troubleshooting, is there an example file available with the
³Unitary System: BlowThru:HeatCool² model in it? This appears to relate to
the system I have been attempting, which was based on a number of examples.
Thanks in advance
Sam
On 10/1/04 8:48 AM, "Richard J. Liesen" <rliesen@xxxxxxxx> wrote:
> A small typo that completely changes the meaning of the message. The
> corrected statement is shown below in between asterisks, since you can not
> use HTML formatting in this group. Richard L.
>
> ******************************************** Hello, I have just made some
> corrections and changes in the Humidistat object along with the relative
> humidity setpoint managers for the new EnergyPlus release. One of the key
> points that will be stressed in the input output reference documentation is
> that a Humidistat is necessary for the control zone to provide a moisture
> load for the setpoint manager to make its calculation. ***This is a
> necessary requirement*** and I am not sure how you made it to this point
> without having one in your input file. As a first step I would add the
> humidistat object and see what happens with your simulation.
>
> Thanks Richard Liesen
>
>
> At 12:43 AM 9/30/2004, Sam Roose wrote: I have uploaded a file called "base
> case" in the "Sam Roose" folder in which there is a steam humidifier for
> humidification and a DX cooling coil for dehumidification. Running this idf
> using a Wellington NZ weather file, I find that the humidity varies between
> 40 and 90%, whereas the intention is to keep it between 50 and 56%. I also
> find that the humidifier only registers a maximum of around 600W of power
> throughout the year, the equivalent of the humidifier fan power (including
> stand-by).
>
>> > Here's my question: Is the rated humidifier power (21 kW in this case)
>> > registering anywhere, say on a different meter from electricity? Is there a
>> > way to make the humid/dehumid equipment meet it's demand?
>> >
>> > At the moment I have set up a minimum humidity set point in the "gallery"
>> zone
>> > and a maximum humidity set point in an adjacent zone (in reaction to a
>> comment
>> > made by Michael J Witte on September 17th). I have also got by without a
>> > humidistat in the past (in other words just using a set point manager).
>> > Recently, a reheat set point manager has been added to the file in order to
>> > make the exit temperature from the cooling coil variable. This has made
>> > temperatures tighter, however this may be the reason I am now having the
>> > humidity control problems.
>> >
>> > Any suggestion on how to fix this problem would be greatly appreciated.
>> Thanks
>> > in advance,
>> >
>> > Sam Roose Energy Analyst Energy Solutions Ltd. Wellington, New Zealand
>> >
>> >
>> >
>> >
>> > The primary EnergyPlus web site is found at: http://www.energyplus.gov
>> >
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>> >
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>> >
>> >
>> >
>> >
>
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