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[EnergyPlus_Support] simultaneous heating and cooling in the condenser loop

All,

I am referring to the example 
HVACTemplate-5ZoneWaterToAirHeatPumpTowerBoiler.idf. The cooling tower 
and the boiler configuration from the HVAC template always results in a 
simultaneous heating and cooling.

The loop water temperature range is specified in 
HVACTemplate:Plant:MixedWaterLoop. Everytime the water loop temperature 
falls below the temperature range specified, the boiler should be ON. 
But unfortunately, the cooler is also ON during the same condition. This 
obviously results in exaggerated gas consumption.

I cannot understand why the control scheme cannot prevent the cooler 
from operating. I can confirm that during those times, the plant loop is 
on heating demand. The plant equipment availability scheme should only 
make the boiler available, and make the cooling tower unavailable. I 
tried to trick this by specifying a gap in the heating and cooling 
demand, so that there is no equipment is available during zero demand. 
But this does not help.

Note that I have to disable the insulation of the external walls so that 
the temperature falls below 20 degC. I use Boise weather to run the test 
simulation for two weeks summer and winter.

Question: is there anything I can do other than using EMS?

Thanks,

Ery


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