[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] Mixed air setpoint manager -- bad mixed air setpoint calculation
My guess is that one of the node names in the SET POINT MANAGER:MIXED AIR is
incorrect.
Mike
On 23 Feb 2007 at 19:54, brianstreby wrote:
> My mixed air setpoint manager is calculating a very low setpoint, i.e.
> less than freezing, subsequently causing the economizer to suck in
> lots of cold air in the winter.
>
> For the first ten minute time step on Dec 15, relevant system node
> temperatures are as follows:
>
> Outdoor Dry Bulb [C]: 1.7
> Return air temp[C]: 13.2 (after return fan)
> Mixed air setpoint temp [C]: -5.3 <---------- !!!
> Mixed air temp [C]: 1.7
> Supply fan inlet temperature [C]: 1.7
> Supply fan outlet temperature [C]: 1.9
> Temperature at reference setpoint node[C]: 12.7
>
> Question 1: What could possibly cause this?
> Question 2: I am usig 6 time steps per hour and noticed big
> fluctuations from one time step to another for a number of output
> variables. What could be causing this instability?
>
> Many thanks,
>
> Brian
>
>
>
>
> 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 - Join or create groups, clubs, forums & communities. Links
>
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
------------------------ Yahoo! Groups Sponsor --------------------~-->
Great things are happening at Yahoo! Groups. See the new email design.
http://us.click.yahoo.com/lOt0.A/hOaOAA/yQLSAA/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/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx
<*> 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/