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Re: [EnergyPlus_Support] Re: System Sizing Questions
I apologize for the long delay in answering this question.
The baseboard heat is not sizing properly, partly because it does not know how
to account for the ventilation load. You will have to manually size the
baseboard heat, or put two baseboard units in the zone. They will both try to
size to meet the entire load, so this should provide adequate heating. This
will result in some extra hot water pumping power, but the units will control
to consume the proper amount of heating.
COIL:WATER:COOLING does not always size properly. Use
COIL:Water:DetailedFlatCooling instead. I will send you the modified input
file in a separate message.
Mike
On 10 Oct 2005, at 14:25, zhaicq98 wrote:
> I found some node connection errors in the file (I put the return fan
> in the outside air system) and I have corrected them. I can generate
> the .svg file and it looks correct. However, the system sizing is
> still not right. The supply air temperature setpoint and indoor
> thermostat setppint are still not met. I have re-upload the file,
> with only one thermal zone and one air handling unit, called
> Autosize_New.idf.
>
> Thanks in advance for your help.
>
> -Chaoqin
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "zhaicq98" <chaoqinz@a...>
> wrote:
> >
> > I am modeling a mixed-function building, with offices and labs. The
> > offices are served by a VAV system and the labs by CAV + induced
> > terminal units.
> >
> > I let Energyplus handle the equipment sizing issue, since I do not
> > really know what the sizes should be. However, I am getting very
> > strange results: the supply air temperature setpoint can not be
> > maintained (I set it as 11.7oC) most of the time during winter and
> > summer. The indoor temperature is getting very high in the summer,
> > and sometimes low in the winter.
> >
> > I tried to increase the sizing factor, but it did not help. I also
> > tried to increase the water flow rate in the cooling coil, and
> > change sizing conditions (design air inlet and outlet conditions)
> > for the coil, it still did not work. In addition, when I increased
> > the coil sizing, I got lots of warnings with regard to the maximum
> > iteration. I do not understand what the problem is and what else I
> > should do.
> >
> > I have uploaded the file, namely Autosize.idf, into the files area.
> > Please, give me some hint here. I will greatly appreciate it.
> >
> > Thanks,
> > Chaoqin
> >
>
>
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>
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>
> Attachments are not allowed -- please post any files to the appropriate folder
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>
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>
> Yahoo! Groups Links
>
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>
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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