[EnergyPlus_Support] can't meet demand?

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Hi,
  I've run a simulation.I set the thermostic setpoint temp at 21.1
(heating) and 23.9(cooling).Since i use the single 
duct:vav:noreheat,i set the supply air temp setpoint at 26(winter) 
and 12(summer).i found the zone temp is bigger a lot than thermostic 
setpoint while heating(21.1);but the zone temp can't reduce in summer.

So i vary the supply air temp setpoint at 4 in summer.Then the zone 
temp can reduce but is much bigger than thermostic setpoint temp
(23.9).i'am puzzled.How can i adjust it to meet the demand?Can l 
adjust by varying supply air temp?If not,what should i vary?

I've upload my idf.zip.Appreciated your help.

Thanks.
pch





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