On 30 Nov 2004, at 22:48, cmsoliveira2004 wrote:
>
>
> First of all, thank you very much for your reply.
>
> Ok, now to the answer provided... when i choose the dual setpoints w/
> deadband, mean that the normal behaviour is for zone temperature varie
> between the setpoints i've defined, and not stay exactly at those
> temperatures. Is that correct?
Yes.
>
> My though was that the temperature would be "locked" at the defined
> temperatures.
That could result is unnecessary heating or cooling energy to push the zone
temperature to one of the setpoints when the zone should just be floating.
>
> Another question, when i start a simulation, does energyplus take any
> initial thermal accumulation in the mass into account? If not, would
> the results be affected in a significant way?
Yes, thermal mass is initialized. At the start of each "environment"
(RunPeriod or DesignDay), the first day is repeated until the changes in
temperatures and loads are within the tolerances specified in the BUILDING
object. The number of such "warmup" days is reported in the eio output file.
After convergence is reached, the first day is repeated one more time, and
these results are reported. If the environment is a RunPeriod, the simulation
then progresses through the remaining days.
Mike
>
> Thnx again for the answers.
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@g...> wrote:
> > For completeness, I am repeating my reply on both message threads . . .
> >
> > The system appears to be running properly. I ran the simulation for
> one week
> > in January and one week in July and the zone temperatures are always
> within the
> > range of heating setpoint to cooling setpoint. The "Dual Setpoint with
> > Deaband" control option means that heating is provided up to the
> heating
> > setpoint, cooling is provided down to the cooling setpoint, or the zone
> > temperature is floating in the deadband between the two setpoints. The
> > schedules in this input file specify heating setpoints of 21C
> (occupied) or 17C
> > (unoccupied) and cooling setpoints of 24C (occupied) or 28C
> (unoccupied). This
> > type of control will automatically switch between heating and
> cooling as
> > needed. (Hint: To report the values of a schedule use "Report
> Variable, *,
> > Schedule Value, hourly;")
> >
> > Mike
> >
> >
> > On 30 Nov 2004, at 18:13, cmsoliveira2004 wrote:
> >
> > >
> > >
> > > Hi, all
> > >
> > > this post is, somewhat, the continuation of "Temperature error in
> > > eplus results".
> > >
> > > My question is, what factors may influence the setpoints i've defined?
> > >
> > > I've tried to do some tests changings some values, redefining
> > > schedules, new temperatures, etc, and every time i run the simulation
> > > the report "Zone/sys Air temp" is always the same, i.e, the zone
> > > temperatures are not what i've specified.
> > >
> > > Unless i misunderstanding the concept of dualsetpoints with deadband,i
> > > believe, it's used when i want 2 different temperatures in the same
> > > day (i.e, 21ºC when occupied and 17 when unoccupied - this is for
> > > winter, having other temperatures in the summer) - using a control
> > > type: 4.
> > >
> > > Don't know if it helps but i've got to warnigs after the simulation is
> > > done, which are the following:
> > >
> > > ** Warning ** Invalid Data Found on Weather Data File
> > > ************* Invalid Weather Codes, Number of items= 43
> > > ** Warning ** Invalid Data Found on Weather Data File
> > > ************* Invalid Weather Codes, Number of items= 6
> > >
> > > The weather file i'm using is for Lisbon.
> > >
> > > The simulation i'm doing is for a validation test of energyplus, but
> > > without having this problem sorted out, i'm stuck...unless that's the
> > > program normal behaviour (which i doubt it).
> > >
> > > I've uploaded the file projecto 16.zip, in case it's necessary.
> > >
> > > Any help would be apprecciated.
> > >
> > > Thnx for reading
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 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:
> 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@xxxxxxxx
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/dkFolB/TM
--------------------------------------------------------------------~->
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
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/