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[EnergyPlus_Support] Re: Environment variables: Flow from FromZone to ToZone
This difference cannot be the result of interpolation - there is just
way too much difference between the input and the output - where do
you suggest that I look to try to determine what is going on?
For example, our weather file for 11 am to 1 pm:
time wind dir speed
1100 290 3.6
1200 290 3.6
1300 290 3.6
Our report gives the following for Environment variables:
time wind dir speed
1100 352.5 4.225
1200 357.5 4.925
1300 352.5 5.575
> >
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@g...> wrote:
> 1. Report variables labeled "Environment" refer to the weather
surrounding the
> building, either from the weather file or from a design day
definition. For
> subhourly timesteps, EnergyPlus interpolates hourly instantaneous
values and
> the csv file reports average values over the hour, so the two will
not match.
> If you want to see the weather file values in the csv file, report
at the
> Timestep frequency, or set TIMESTEP IN HOUR = 1.
>
> 2. The explanations of these output variables in the Input Output
Reference,
> pp. 328-329 (pdf pp. 361-362) should help clear this up. If not,
ask more
> questions.
>
> Mike
>
>
> On 6 Jul 2005, at 22:10, ruby98103 wrote:
>
> > Two issues:
> >
> > 1. I can't find an explanation in the manual of the Environment
> > variable key value. I assume that it means the air outside of and
> > surrounding the building. For the variables that are in our
weather
> > file, I would assume that it would just echo the weather file
data.(I
> > am asking for an hourly average of the variable and am using two
> > simulation periods per hour.) That is not happening.
> >
> > We modified a weather file so wind direction and speed would be
> > stable for several hours to get a more steady state value for our
> > COMIS air flows. The temperature, radiation and other variables
were
> > left the same as they are in the TMY2 file. But the Environmenta
> > variable is not reporting the same number, nor is it stable.
> >
> > Details: for example, our weather file for 11 am to 1 pm is:
> > time dry b dir speed
> > 1100 23.9 290 3.6
> > 1200 25.0 290 3.6
> > 1300 26.1 290 3.6
> >
> > Our report gives the following:
> > 1100 23.75 352.5 4.225
> > 1200 24.725 357.5 4.925
> > 1300 25.825 352.5 5.575
> >
> > Just what is this Environment variable? Can I echo the weather
file
> > to be sure it is being read correctly?
> >
> > 2. For the reporting pair:
> > "Air Flow from FromZone to ToZone through COMIS link" and
> > "Air Flow from ToZone to FromZone through COMIS link"
> >
> > which is the FromZone and which is the ToZone? Sometimes I have a
> > number for the hourly average that is about the same for both for
a
> > given COMIS "Name of Associated EnergyPlus Surface" and sometimes
it
> > is zero for one and real for the other.
> >
> > How do I interpret this?
> >
> >
> >
> >
> > 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.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@g...
The primary EnergyPlus web site is found at:
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