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[EnergyPlus_Support] Re: Unitary DX for cooling - not sizing well

The " Loads Convergence Tolerance Value" is a fraction of the load and the default seems to be 0.04. Do you have a suggestion on how big this value can be without affecting the results?

0.04 means 4% difference between two consecutive iterations, correct?
0.1 would mean 10% difference, correct?

Homero


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> Certainly, if things are not reaching convergence (and thus 
> terminates too early) it may not be sizing properly.  You might 
> change your convergence tolerances, report during warmup (to see what 
> is happening) or try to determine what is causing the warmup 
> convergence problems.
> 
> While the helpdesk staff don't terribly like large problems that 
> aren't "focused" to the actual problem and can be dealt with quickly, 
> we will tolerate larger problems in the name of solving the issue....
> 
> At 01:19 PM 6/10/2012, Jean marais wrote:
> >I have compared the design zone loads and air flows calculated in 
> >the eio file to the size of the DX capacity (also in the eio file) 
> >for the cooling design day. They seem undersized in some of my zones 
> >where there is a high solar heat gain.
> >
> >I don't want to send the idf to the help desk, because it is 
> >terribly big and takes 45 min to simulate. That being said, this 
> >model has a thick slab with internal heat source which causes very 
> >small fail rates for the default load convergence tolerances. Could 
> >this be part of the problem?
>



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