[EnergyPlus_Support] About temperature control

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Hi,all
	I¡¯ve create a model using Standard VAV system without 
outside 	air, hot water reheat coils,purchased cooling and heating. 
All equipment is autosized. Zone temp control is dual setpoint with 
deadband. Zone heating setpoint is 20¡æ,coolint setpoint is 26¡æ.VAV 
supply air temp setpoint seasonal change is 13 ¡æ in summer and 16¡æ 
in winter.
	1.I simulate for all year and find that some days in summer 
are too cold(21¡æ~22¡æ).I check the VAV damper,it is in minimum air 
fraction.It seems that the supply air is too cold to control the zone 
to temp setpoint.Can VAV reheat coil heat the cold air to remain zone 
setpoint temperature?How to adjust this days to zone temperature?I 
check the vav reheat coil,it is off.
	2.I run the example 5ZoneEngChill.idf for all year.I found 
in some day,such as Apr 3,the main heating coil is on at sometime,but 
the main heating coil scheduled off .I¡¯m puzzled.Does it has a 
priority problem?On the other side,if in winter require 
cooling,system can turn on the cooling coil although it is scheduled 
off?
	3.The design day are controlled well,but for all year,some 
days are controlled bad.At present I just want to control the zone to 
temperature setpoint and gain the corresponding thermal comfort. 
Taking no account of other.Does the VAV templet achieve aim?Can you 
recommend other HVAC system?

	Thanks in advance.
         pch




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