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

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

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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