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[EnergyPlus_Support] Re: Warning: "Air volume flow rate per watt ... is out of range .."
Dear E+ Forum,
After spending considerably more time trying to resolve this problem,
I'm now seeing 6700 warnings after cleaning up a few minor
discrepancies. I'm hoping that someone can take a look at the file I
uploaded to determine the cause!
p.s., The uploaded file is called "AirFlowperWatt.zip"
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@...>
wrote:
>
> Dear E+ Forum,
>
> I am looking at this warning again, trying to understand it... and
> failing to do so.
>
> In short:
> The warning occurs over 3700 times in 3 Design days; this seems
excessive!
> The warning appears to occur multiple times in a single minute (I get
> multiple warning messages for the exact same time, coil and design
> day. I have specified 4 timesteps per hour, but the warnings refer to
> minutes that are NOT timesteps.)
> The "air volume per watt" is an acceptable value at the timestep (It
> is within the acceptable range noted in the warning.)
>
> Since this warning occurs for a non-timestep minute, something seems
> to be going on in the background. In addition, there are no other
> errors or warnings which suggest a cause for this one.
>
> Thanks in advance.
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Don Shirey <shirey@> wrote:
> >
> > The warning can be an indication of very low supply air flow rate
> > compared to the coil's cooling capacity.... and very low outdoor air
> > temperatures may also be contributing.
> >
> > Find the autosized air flow rate and cooling coil capacity in the
..eio
> > file ... and then look at the COIL:DX:COOLINGBypassFactorEmpirical
> > documentation in the IO Reference and Engineering Reference for how
> that
> > coil model works and how the flow rate/capacity values are used.
> >
> >
> > JV Dirkes II wrote:
> > > Dear E+ Forum,
> > >
> > > The Air handler for a current E+ model (v2.2) has a
> > > COIL:DX:COOLINGBypassFactorEmpirical cooling coil and a hot water
> > > heating coil. The model runs, but has hundreds of instances of this
> > > warning or "Full load outlet temperature indicates a possibility of
> > > frost/freeze...", which appears to have a similar cause. All
> > > capacities are autosized and I am simulating only 3 Design Days
with 4
> > > timesteps per hour (so the hundreds of warnings seem to be too
many!)
> > >
> > > Will someone help me understand the cause of the error and how to
> > > resolve it? Thank you!
> > >
> > >
> > > ------------------------------------
> > >
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > >
> > > The group web site is:
> > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > >
> > > Attachments are not allowed -- please post any files to the
> appropriate folder in the Files area of the Support Web Site.
> > >
> > > EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf
> under the Documentation link and press the "search" button.
> > > Yahoo! Groups Links
> > >
> > >
> > >
> >
>
------------------------------------
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