[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] Transient simulation of building structure and indoor air
Mike,
Thank you very much for your reply.
Actually, what exactly I?m trying to do is to
repeatedly apply a one-day (24-hour) outdoor air
temperature boundary condition to a building for x
days and find out the temperature responses of the
indoor air and the building structures during these x
days. That?s said, I?m not only interested in the
steady-state performance after x days as can be done
with EnergyPlus design-day simulation, but also (more)
interested in the transient process during the warm-up
or cool-down period. This is to find the intermediate
temperature profile during the warm-up period before
the steady state. Is it possible to find this kind of
results with energyplus? You mentioned EnergyPlus
could tell us how many warm-up days are needed to
reach the periodic steady state, but I really want to
know the values during those warm-up days to compare
against other softwares.
Best regards,
Zhuo
--- "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> Zhuo:
>
> The design day simulations are repeated for several
> days in order to
> reach a periodic steady state. The "warmup" days
> end when the
> changes in temperatures and loads from one day to
> the next are within
> the tolerances specified in the BUILDING object.
> The number of
> warmup days is reported in the eio output file and
> it is limited to
> 25 days. If the tolerances have not been met within
> 25 days, then a
> warning is issued (Loads Initialization did not
> Converge) and the
> simulation proceeds. So, the design day simulation
> may already be
> doing what you want.
>
> If you prefer more direct control, you can make a
> custom epw weather
> file. The easiest way to do this is to take an
> existing epw file for
> the location you wish to model and use the Weather
> Converter to
> convert it into csv format. You can then edit the
> csv data in a
> spreadsheet program and then convert it back to epw
> format.
>
> Mike
>
>
> On 14 Jan 2003, at 12:51, lengjing lengjing wrote:
>
> > Hi,
> >
> > I抦 trying to compare several softwares
including
> > EnergyPlus in terms of their transient simulation
> > capabilities. I have used EnergyPlus for design
> day
> > analysis before, which is steady state and can be
> done
> > by selecting the location and then the design-day
> > temperature profile is automatically generated by
> > EnergyPlus.
> >
> > However, in order to compare the transient
> performance
> > of EnergyPlus with several other softwares that
> are
> > not based on the epw weather format, I would like
> to
> > use some randomly generated hourly temperature
> values
> > as the same input for all the programs. To put it
> > simple, I want to compare the temperature
> responses of
> > the indoor air and the walls (or even different
> layers
> > of the walls) under both steady-state and
> transient
> > conditions. For example, use a 24-hour temperature
> > data as the periodic weather input and find the
> > temperature responses until the temperatures of
> indoor
> > air and the walls have reached steady states. It
> might
> > take several days, say, x days, for the
> temperatures
> > to reach steady states. Is this possible with
> > EnergyPlus? If so, could you please tell me how to
> put
> > in my own temperature values? If not, can I just
> run a
> > design day and look at the temperatures of air and
> > walls during these x days from warmup until steady
> > state? Thank you very much in advance for your
> help.
> >
> >
> > Regards,
> >
> > Zhuo
> >
> >
> > __________________________________________________
> > Do you Yahoo!?
> > Yahoo! Mail Plus - Powerful. Affordable. Sign up
> now.
> > http://mailplus.yahoo.com
> >
> > ------------------------ Yahoo! Groups Sponsor
> > ---------------------~--> Flexible Keyboard is the
> ideal accessory for
> > PDA users that are on the move.
> >
>
http://us.click.yahoo.com/dCBVZC/WnCFAA/xGHJAA/dkFolB/TM
> >
>
---------------------------------------------------------------------~
> > ->
> >
> > To unsubscribe from this group, send an email to:
> > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> >
> > 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 are of the Support
> Web Site.
> >
> >
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
>
>
>
>
========================================================
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
__________________________________________________
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
http://mailplus.yahoo.com
------------------------ Yahoo! Groups Sponsor ---------------------~-->
Flexible Keyboard is the ideal accessory for PDA users that are on the move.
http://us.click.yahoo.com/dCBVZC/WnCFAA/xGHJAA/dkFolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
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 are of the Support Web Site.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/