[EnergyPlus_Support] DX coil water cooled system (rooftop water cooled)

["thaisarquiteta" <thaisaya17@xxxxxxxxxxx>]

Dear all,

I'm modeling a DX coil water cooled system (rooftop water cooled). 
All the nodes seem to be ok and I'm using designer data to represent 
the real system. I need to set constant fans and variable pumps. I'm 
encountering the following problems:
1)	Although I set the air flow (minimum and maximum) in all the 
possible inputs to make the fans constant, the air flow keeps varying.
2)	If at the "UNITARYSYSTEM:HEATPUMP:WATERTOAIR" I set  "Supply 
air fan operating mode schedule" to work constant, the DX cooling 
coil never works. The same problem occurs in the example 
file "HeatPumpWaterto AirEquationFit.idf".
3)	I´m using PUMP:VARIABLE SPEED for the condenser loop, and if 
I set the "Pump Control Type" as intermittent, the cooling tower 
never work, and I have no heat rejection.
4)	I can not use multipliers for the zones neither for the "zone 
group" object because if so, the setpoints of temperature on the 
multiplied zones are not met, and it affects the energy consumption.
The zone multiplier is not a real problem; however, I need the fans 
to be constant and the pumps to be variable and intermittent.
Can anyone help me? Can it be an E+ bug or is it something I'm doing 
wrong?
Any help would be much appreciated!!!

By the way, in other model, the zone group also affects badly the 
outputs of airflow when I use it in conjunction with Underfloor Air 
Distribution.
Thanks a lot,
Thais Aya H. Inatomi



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