[EnergyPlus_Support] Missing Temperature Set-point

["anarui.oliveira" <anarui.oliveira@xxxxxxxxx>]

Hi.

Some time ago I had a problem with achieving set-points in a 
simulation, and it is happening again in a another model. It is only 
happening with the cooling set-point, but in this case deviations go 
as high as 5ºC (which is quite a lot).
Whenever the timestep (detailed reporting) goes down to the minimum 
(1min) while failing to achieve set-points, is it likely to be the 
same numeric problem identified the last time (regarding load 
estimates to achieve set-points)?

The model is using central Air Handling Units with min=max flow, unit 
ventilators with ON/OFF fans and Water Loops with Intermittent 
working Pumps, so I suppose it is to expect that air and water flows 
graphics look setp-wise and are constant=maximum whenever 
conditioning is being asked?
Unmet Load is always zero (even when temperature set-points are 
failing), and cooling loads are below the equipment maximum 
capacities (both plant and local equipment).

It also uses exhaust fans to correct the return flow to the central 
AHUs (because they have heat recovery systems).
To correctly perform zone control, these fans should have higher 
priority than direct air and local unit ventilators ?

Is there any other checking procedure you could advise me to detect 
eventual causes of this problem?

Thanks in advance.
It took quite a lot of work to implement the model, so it would 
really be nice if I could actually get it to work properly.
All help appreciated!

Regards,
Ana Rui.


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