[EnergyPlus_Support] Re: Ice storage system in EnergyPlus

["mingming_zuo" <mingming_zuo@xxxxxxxxx>]

Thank you,Mike! However, this configuration will do affect the 
efficiency of downstream chiller because of lower inlet water 
temperature, I really wonder what difference will this configuration 
make when compared to a real chiller upstream and ice tank priority 
configuration? Moreover, when I tried to check inlet and outlet 
temperatures of both chillers and ice tanks, even the loop outlet 
temperature has achieved -5C and the tank has been fully charged, 
there is still some energy consumption of chillers, is it confusing?
My pump's ration of pump in flow is 0, so I don't think additional 
heat will add to this loop.Or is there any possible reason for this 
instance? Thank you again and I am looking forward to your answer!




--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> The ice storage units currently only work with component set point 
based 
> control, they do not work with load based controls. 
> 
> The only way to model ice tank priority would be to create a 
second 
> instance of the chiller which is downstream of the ice tank.  Then 
use 
> the setpoint manager schedules to operate only one of the two 
chillers.
> 
> Mike
> 
> 
> mingming_zuo wrote:
> > Hi all, I tried to model ice storage system with different kinds 
of 
> > operation strategy in energyplus such as ice tank 
priority,chiller 
> > priority.By doing these work, i come to a question:what control 
> > strategy of plants in a loop can energyplus achieve? Can it just 
act as 
> > it is said in the input&output reference? I think it may not be 
the 
> > fact. I would like to share some of my failure with you, which 
may help 
> > us have a good understanding of energyplus and make better use 
of it.In 
> > one of my several models, the chiller and ice tank is configured 
in 
> > series with the chiller upstream.Two operation schemes,one is 
Cooling 
> > Load Range Based Operation and the other is Component Setpoint 
Based 
> > Operation, are also defined in the Plant-condenser 
control.Cooling Load 
> > Range Based Operation is set to run during peak hours while 
Component 
> > Setpoint Based Operation runs during the night time. Moreover, 
we 
> > define ,in plant equipment list,the ice tank first and then the 
main 
> > chiller, hoping the ice tank will satisfy the cooling load 
> > first.However the results of this model is really disapointed 
and the 
> > chiller still has its priority in satisfying the cooling load. I 
also 
> > upload an idf file named IceStorage-Series-ChillerUpstream.idf 
which is 
> > an example file with some related parts redefined.I hope it can 
help us 
> > to learn more.
> >
> >
> >
> > 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.
> >
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf 
under the Documentation link and press the "search" button.
> >  
> > Yahoo! Groups Links
> >
> >
> >
> >
>



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