[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [EnergyPlus_Support] Crazy Plant Loop
Hi Miguel,
As per our knowledge, there are no known issues as of yet with the pumping scheme/control in plant loops. However, it is always possible that there could be a bug and it is just not manifesting in any of our test files. In order to look into the issue more clearly, please upload your file into the files area of the group or send the file directly to me at sankar.padhmanabhan@xxxxxxxxxxx , or else explain how to reproduce the error.
I would be more than happy to look into the file and fix any bug that may exist.
Thanks
Sankar
S.K.Padhmanabhan
Research Associate
Mechanical & Aerospace Engineering
Oklahoma State University,
Stillwater, OK - 74075
Ph: (405)744-4380
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx on behalf of Miguel Angel Pascual
Sent: Wed 12/21/2005 8:09 PM
To: EnergyPlus_Support@yahoogroups. com
Subject: [EnergyPlus_Support] Crazy Plant Loop
Dear group,
We are experiencing big problems with a Heating Plant Loop. The system consists of two simple boilers + bypass with an intermitent variable flow pump.
On the demand side, we have 4 pipe induction units equipped with heating and cooling coils.
At the begining we had several problems with the HVAC max iterations warnings. Sometimes at the moments when the non-convergence occurred there were very big gas consumptions.
We could get rid of the warnings switching the boiler to variable flow and autosizing the coils.
While we were starting to think that life was beautiful we noticed that some zone heating coils were demanding heat (flow) with no heating load at the zone (summer period).
To avoid this energy consumption, we modified the availability schedule of the plant loop, setting it off for the summer period. This way the boilers are off but the pump is still working regardless of the plant schedule.
Now, we have run out of ideas. Can anybody suggest anything?
Two weeks ago we tried to simulate a similar system but with a GSHP. We had the same problem: the pump was running at the off hours of the plant loop. This problem can be easily reproduced in the GSHP example (just modifying the plant loop availabillity schedule).
So, is there any problem with plant loops? Or have we misunderstood any plant loop concept?
Thanks in advance,
Miguel Angel Pascual
---
Sent via BlackBerry
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.idf and press the "search" button.
Yahoo! Groups Links
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
Get Bzzzy! (real tools to help you find a job). Welcome to the Sweet Life.
http://us.click.yahoo.com/KIlPFB/vlQLAA/TtwFAA/dkFolB/TM
--------------------------------------------------------------------~->
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.idf and press the "search" button.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/