RE: [EnergyPlus_Support] Re: \[EnergyPlus_Support\] Outlet and Inlet differ by more than tolerance\?

[YuanLu Li <yli006@xxxxxxxxxxx>]

Hi,  YunPeng
 
May I ask you  on how often was the message during the simulation.
 
If it is only once or twice during initialization, or schedule value change and without stopping the simulation, may be the warning can be ignored.
 
In most digital systems, the calculation is done in steps.  When there is a step demand change, the last feedback value and the present new predicted value do not match within the tolerance, and hence created a warning.  If you do have a .csv result, you can look at the result and may see a small overshot at the time the warning is issued.
 
Making the simulation time interval smaller, (larger timestep value, maximum 60) or changing the tolerance may stop the warning.  However, if the simulation was successful and the warnings are only a few (not more than 3 or 4 a day.), it can be ignored.  Once a day will give you 365 warnings.

If you post the IDF file, we can study the problem in more detail.
 

 Dr. Li, Yuan-Lu  

 

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To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: hyp@xxxxxxxxxxxxxxxxx
Date: Sat, 19 Dec 2009 18:07:33 +0800
Subject: [EnergyPlus_Support] Re: \[EnergyPlus_Support\] Outlet and Inlet differ by more than tolerance\?

 

thank you dashamir, I'll try it!

dashamir marini å??é??:
>
>
> Hello
>
> From first view of Warning message seems that mass flow rate among out
> and in node at PlantSupplySide exceed tolerance value which you have
> input in your idf file. That means some leakage may have occured in
> demand side (distribution system or zone equipments) of your system.
> Usually this happen for air system flow, and I'm not sure if it can
> happen for water flow too.
> One my suggestion would be: try to increase tolerance value just to
> understand if this warning will occure more of course without
> exceeding limit values. If happen again try to check control objects
> in idf file.
>
> that is my opinion
>
> good luck
>
> Dashamir
>
>
Hi all!
The following warning means? where should I change the urguments of the
idf file?

** Warning ** PlantSupplySide: Error (CheckLoopExitNode) -- Mass Flow
Rate Calculation in PlantLoop=PLANTLPSPLSIDE CHW CHILLED WATER LOOP,
Outlet and Inlet differ by more than tolerance.


--
ã??Give my best wishes to you!
Respectfully yours, YunPeng Hu
Huazhong University of Science and Technology
Wuhan, Hubei, China
hyp@xxxxxxxxxx.edu.cn
hyp6789@163.com

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