[EnergyPlus_Support] Fan Cycles On For No Reason

["Edward Lyon" <eglyon@xxxxxxx>]

The attached file is a further modification of a project I am working on. I have a single zone with a cycling fan system for heating and cooling. I have been looking at the temperature and mass flow of the output node of the primary air loop.  The flow volume is usually very low because I have an oversized AC system that operates on very short cycles.  However I also observed that the flow volume is maxed at 24 times through the year with no apparent reason for the system to run at all and with neither heating or cooling apparent in the flow temperature.  The first occurance of this problem is approximately 01/03 2am.

1. I think there may be a bug lurking here

2. I don't think EnergyPlus can properly model this system because of the short cycles.  At some times the fan does not really run long enough for the dx to charge and start cooling.  I was considering linking some ventilation air to the fan operation, but with the short cycles, I doubt the outside air volume would be correct.

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