Re: [EnergyPlus_Support] How the dual setpoint contorl works?

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Dual setpoint with deaband operates as follows:

Heating - If the zone temperature is predicted to fall below the heating 
setpoint for the current timestep, then heating is requested from the HVAC 
system to maintain the zone at the heating setpoint.  

Cooling - If the zone temperature is predicted to rise above the cooling 
setpoint, then cooling is requested from the HVAC system to maintain the 
cooling setpoint.  

Deadband - If the zone temperature is predicted to remain in the deadband 
between the heating and cooling setpoints, no heating or cooling is requested 
from the HVAC system.  Depending on the system type, the sytem may continue to 
provide air flow which causes some heating or cooling even when the temperature 
is in the deadband.  For example, a furnace with DX cooling with continous 
supply fan operation.  The furnace and cooling coil will remain off, but 
unconditioned mixed air will be supplied to the zone.  

Note that the "Zone/Sys Heating/Cooling" report variables indicate the actual 
impact of the HVAC system on the zone, not the load requested.

Mike


On 22 Dec 2004, at 23:05, Ali_Ajmi wrote:

> 
> Dear All
> Could any one explaine to me how the cotrol of the zone would work if i select a
> dual setpoint with deadband and both cooling and heating sechdual are setted. I
> mean it would works cooling and heating or only heating and cooling?
> 
> Regards
> Ali
> 
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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