[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Controlling Chillers in Series



Thanks Jim. I'm not sure I understand very well how does the temperature drop at each chiller is controlled when both chillers are on. 


2013/11/19 Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
 

Santiago,

Perhaps you should use one setpoint manager, plus a PlantEquipmentOperation: object to define the range of operation for each chiller.

 

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Santiago Velez
Sent: Tuesday, November 19, 2013 8:20 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Controlling Chillers in Series

 

 

Dear forum, I'm having some trouble controlling a Chilled water loop with two air cooled chillers in series. I would appreciate some comments on the approach. 

 I setted a 'schedule setpoint manager' at the outlet node of each of the chillers  and a 'scheduled setpoint manager' for the CHW Loop Supply Side Outlet. The goal is to have a water temperature drop of 5 C on each. And I've also setted a control scheme to have only the first chiller operating for the first half of the load and the second coming on for the rest of the load. 

 

I'am reporting temperatures at outlet of supply side of the CHW Loop and outlet of each chiller.

Cooling Load is met at all times and  CHW Loop setpoint is controlled correctly. The problem is each chillers temperature drop is not what I've intended, instead of 5C in each I'm having approximately 3 C in the firs, 7C in the second. This two values vary slightly with time. Chiller capacities and flow are autosized.

 

Any thoughts? any available examples on how two control this setup and what I should expect?

 

Thanks in advance,


Santiago.

 

 




__._,_.___


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.



Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___