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Re: [EnergyPlus_Support] HVAC loop convergence exceeded...

Hi Aymeric,
Is the loop autosized? If yes do you have autosizing in all the 
components? There could be a problem when you have autosizing and hard 
number mixed up in the loop. What control type are you using for the 
loop. In variable flow configurations, the simulation some times get 
stuck at some loads. If that happens the chillers tend to turn OFF/ON in 
between iterations. Give a brief description how you have your system 
modeled as in what  type of pump control, loop control etc, which might 
help in identifying the problem.

Thanks
Sankar

aymericnovel wrote:
>
> Good morning,
>
> I have a chilled water loop with 4 chillers in parallel. Each branch
> has a variable speed water pump. The whole water loop is meant to
> perform with variable water flow to adapt to the load.
>
> It looks like it works. Still, the simulation takes a lot of time
> and "HVAC loop maximum iteration exceeded" error message occurs a lot.
> I am pretty sure it is the mass flow balance that does not converge but
> I do not find a solution to solve this.
>
> Does anyone see what would be the trick? (where is convergence criteria
> of massflow by the way?)
>
> Thank you,
> Aymeric
>
>  

-- 
Sankar Padhmanabhan
Graduate Research Assistant
Ph.D Student
Mechanical & Aerospace Engg
Oklahoma State University,
Stillwater, OK-74078
Ph:405-744-2410 (O)


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