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Re: [EnergyPlus_Support] Re: load analysis
On 8 Sep 2005, at 15:33, hbn_pch wrote:
> i'm sorry that i did't describe the my building model clearly.I just
> want to gain the building envelope load(including solar gain),so i
> did't add any other gain such as infiltration,ventilation,internal
> gain, etc.According to your suggestion ,i checked the model setting
> again,but i can't determin where the problem is.The weather file is
> download from web(nanjing)and the clearness in summer design day is
> 1.The temp range is 10 in summer design.i choose do desing day
> simulation as yes and the temperature setpoints in summer is 25.
It is difficult to guess what may be wrong. Please upload the idf file
(zipped) to the files area of the yahoo group or e-mail to energyplus-
support@xxxxxxxx
>
> Another problem:i search former issues and find that if the warning
> (inside surface heat balance can not convergence)is few,then the
> value is valid,otherwise ,the value is not valid.But how many warning
> is considered to few?I simulate for annul simulation and there are
> fifteen warning.Is the warning valid?
>
If using 15 minute time steps, this represents only 0.04% of the year. Most
likely, this is valid. If warnings are occuring for more than 1 or 2% of the
year, then I would be concerned. But that is just an educated guess, not based
on anything factual.
> Third problem:i have ask a problem about the roof shading.But i'm
> puzzled.In i/o,it said that the surface:shading:attached is used for
> wall or roof.but how to define the shading for roof?horizontal or
> vertical shading?if horizontal,then how to define the base surface,it
> is impending.
I am not sure that I understand the question. Surface:shading:attached is only
required when using solar distribution "MinimalShadowing". In this case, the
shading surface only casts shadows on the "base surface", which in this case
would be the roof if I understand the problem correctly.
However, it is highly recommended that one of the "FullExterior" options be
used. In that case, Surface:Shading:Detached:Fixed or
Surface:Shading:Detached:Building may be used. These shading surface types do
not have a "base surface" input. Their shadows are global to any surface.
Mike
>
> thanks very much.
> pch
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@g...> wrote:
> > Check the location and design day objects (time zone, clearness),
> check the
> > thermostat schedules, check the internal gain schedules. Does the
> cooling
> > design day have a range of temperature, or is it constant? Is the
> clearness >
> > 0? In the RUN CONTROL, set "Do design day simulation" to YES, and
> turn on
> > reporting of thermostat setpoints, internal gains, weather data,
> etc. This
> > should help determine where the problem is.
> >
> > Mike
> >
> >
> > On 6 Sep 2005, at 16:32, hbn_pch wrote:
> >
> > > Dear all,
> > > i'm puzzled for the zone design cooling load after a
> simulation.i
> > > found that time of the peak cooling load of some zones is
> intricate.for
> > > example:
> > >
> > > Zone Sizing, 1F_9, Cooling, 895.09 , 0.66339E-01, 0.66339E-
> 01,
> > > SUMDAY, 00:15:00, 29.600 , 0.19897E-01
> > >
> > > Zone Sizing, 1F_4, Cooling, 1253.5 , 0.92903E-01, 0.92903E-
> 01,
> > > SUMDAY, 00:30:00, 29.600 , 0.19897E-01
> > >
> > > these two zones faces west,but the time of peak is 00:15:00,is it
> > > possibel?
> > >
> > > thanks
> > > pch
> > >
> > >
> > >
> > >
> > >
> > >
> > > 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
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