Re: [EnergyPlus_Support] Mass flow rate problems using energy plus 1.2.2

["Michael J. Witte" <mjwitte@xxxxxxxx>]

The error message references the demand side of the chilled water loop.  Check 
coil controllers.  Is there a bypass on the demand side?  If you cannot find 
the problem, please upload the zipped idf file to the yahoo files are in the 
Problem Submittals folder.

Mike
 

On 27 Sep 2005, at 16:31, patrik_789 wrote:

> Dear all,
> 
> I calculated a system with the new version of energy plus 1.2.2., 
> which was created with/for the old version of energy plus 1.2.1, 
> Using version 1.2.1 there haven `t been any relevant error massages, 
> but using version 1.2.2 the following error massage appears:
> 
> ** Warning ** Error -- Mass Flow Rate Calculation in Plant 
> Loop=CHILLED WATER LOOP, Outlet and Inlet differ by more than 
> tolerance.
>    **   ~~~   ** Loop inlet node=CN010, flow rate=7.740642072192259E-
> 002
>    **   ~~~   ** Loop outlet node=CN001, flow rate=0.154812841443845
>    ** Severe  ** Inlet parameters for plant demand side splitter are 
> not physically possible
>    **   ~~~   ** Problem in input for plant demand side CHILLED 
> WATER LOOP
>    **   ~~~   ** The maximum flow out of the splitter is less than 
> the minimum inlet flow
>    **   ~~~   ** Flow rate inputs for the loop do not match flow 
> requirements of the various branches/components
>    **   ~~~   ** Check your flow rates and make sure that flow 
> balances between the splitter inlet and outlets
> 
> I already controlled all my nodes, branches, mixers, splitters and 
> the order of the branches in the branch lists and in the mixers/ 
> splitters. The results were ok.
> After this I controlled the mass flow rates in the chilled water 
> loop, which is connected with two condenser loops by two chillers. 
> (Those chillers are controlled by two HEAT EXCHANGER:HYDRONIC:FREE 
> COOLING- objects), but  I did not find any error.
> May you have any idea, what the problem could be or could you give 
> me a hint to resolve this problem?
> 
> Best regards,
> 
> Patrik     
> 
> 
> 
> 
> 
> 
> 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
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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