Re: [EnergyPlus_Support] About temperature control

[Fred Buhl <wfbuhl@xxxxxxx>]

The current EnergyPlus program should handle over cooling by VAV systems
correctly (by turning on the reheat coils and reheating to the heating 
setpoint).
If you are using the current version of EnergyPlus, please upload your file.

In 5ZoneEngineChiller, the central heating coil is used all year (in the 
current
example file I am looking at). Confusingly, there is a schedule called 
HeatingCoilAvailSched,
but it is not used. The central heating coil uses the same availability 
schedule as the
reheat coils. The cooling coil appears to be scheduled off in the 
winter, though it
is on for the winter design day.

Make sure all your coils are scheduled on when you want them to be. Also 
check the
pump schedules. If the pump serving a coil is off, the coil won't 
operate even if it
is scheduled on.

Fred Buhl

hbn_pch wrote:
> 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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------------------------------------

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