[EnergyPlus_Support] Re: Limited Cooling Capacity

["Florian Stift" <florian.stift@xxxxxxxxx>]

Fred,

Thanks for your quick answer!

My problem is that I want to get the air temperatures of a zone with 
a limited cooling capacity from any ideal system.
I do not need to define any supply air temperatures or maximum flow 
rates.

Basically I just want to limit the cooling capacity to e.g. 2kW, to 
examine the resulting zone air temperatures. I used to use BLAST, 
where it was quite easy to do that (limit the cooling capacity in the 
controls tab). 

Do you have any idea how to simulate that within EnergyPlus?

Your help is greatly appreciated.




--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Fred Buhl <wfbuhl@...> 
wrote:
>
> Florian,
> 
> Since one  can't  set the cooling  capacity of Purchased Air  
directly,  
> (one  can  only  set
> the maximum flow rate) I assume you are comparing "Purchased Air 
> Sensible Cooling Rate"
> with "Zone/Sys Sensible Cooling Load". "Zone/Sys Sensible Cooling 
Load" 
> is calculated
> after the zone temperature is updated at the end of the HVAC 
timestep; 
> "Purchased Air Sensible Cooling Rate"
> is calculated using the zone (or return) temperature befor the 
update. 
> If the zone temperature is
> tightly controlled, there will be no difference. If the zone 
temperature 
> is rising, the zone load
> will be larger than the Purchased Air output.
> 
> Fred Buhl
> 
> Florian Stift wrote:
> > I am interested in the air temperatures of a zone in response to 
a 
> > limited cooling capacity. I don't want to take any system loads 
into 
> > account.
> >
> > When limiting the cooling capacity using the Purchased Air 
Option, the 
> > air temperature exceeds its setpoints as I supposed but 
the "Zone/Sys 
> > Sensible Cooling Load" is higher than the limited cooling 
capacity. How 
> > can simulation results outrun the cooling capacity entered?
> >
> > Thanks for your help!
> >
> >  
> >
> >
> >
> >
> >
> > 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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