Re: [EnergyPlus_Support] Limited Cooling Capacity

[Fred Buhl <wfbuhl@xxxxxxx>]

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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