[EnergyPlus_Support] How many zones for a VAV system

["ooikoonbeng2004" <ooi_kb3@xxxxxxxxxxx>]

Dear all, 

i would like to how to model the ceiling space, space between ceiling 
and the floor of the next storey, that is being used as space for the 
return air, to a vertical return air shaft in the center of a multi- 
storey building, to unitary (packaged) air conditioning units at the 
roof top. 

i need to know this as i do not know what to input in the  
OutsideFaceEnvironment of the ceilings, and floors, of the three zones 
(North, South and Center) of the four stories of this building that is 
being supplied by three packaged air conditioning units at the roof top

The air from the three zones return through the common vertical return 
air shaft. A variable speed drive fan supplies the Variable Air 
volumes for each zone. Each floor of the building is divided into 
three zones, South, Central, and North.  These three zones of the four 
floors are connected vertically to four systems, unitary (packaged) 
air conditioning units with one fan and many compressors each, on the 
roof. The North zone is exposed to more sun load, and is therefore fed 
with two units.  Since each floor is fed with conditioned air from 
three systems, a single system failure will not make a floor devoid of 
air-conditioning. The overall reliability is thus very high. 

This rectangular building has 51.8m width, mostly glass, facing North 
and South. Each upper floor overhangs 1.6m of the lower floor to 
provide shade.   
 
How many zones do in need in my model? 

Much obliged,
ooi

 



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