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[EnergyPlus_Support] simulation comparion

Hi all,

Given that replacing a VAV system with a Fancoil plus Outdoor-air 
system, (any other parts and setpoints in the building kept all the 
same) , which one  would consume less energy typically in practice ? 

 An all-air system usually uses much more energy than a water-air 
system,even though it is an energy-efficient VAV system, doesn't it?

In my simulation, it is the Fancoil+fresh air system that uses less 
electricity. The central AHU fan in VAV system consumes about 10 times 
as the summation of all the fancoil's fans. I noticed "Delta Pressure" 
can influnce the simulation results signifcantly in the 
Fan:simple:variableVlolume object, as a approx proportional 
relationship. Since it can not be autosized , I use an estimated value 
of 1300Pa for a 8000m2 building.

Eventhough I use a small value there, say, 300Pa, the VAV still use 
more energy. I guess it could be right since transporting air could 
lead to a larger energy usage than water. Could anyone expirienced give 
your inlight on this issue?  

Thank you.
Eric






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