Re: [EnergyPlus_Support] using economizer

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

This can happen if the economizer mixed air set point is too low, 
causing the economizer to bring in too much cool air which then must 
be offset by additional heating coil operation.  Check the setpoint 
on the mixed air node.  This must be set by using a setpoint manager. 
 See the 5ZoneAuto.idf example for assistance.  You can use report 
variable "System Node Setpoint Temp" to verify the setpoint on HVAC 
nodes.

Mike

On 23 Sep 2003, at 17:23, Roberto Lollini wrote:

> I am trying to set the CONTROLLER:OUTSIDE AIR, but I found a very
> strange thing: when I set the EconomizerChoice on NO ECONOMISER the
> gas facility consumption become the half with respect to the
> simulation using ECONOMIZER. I can't understand how with the
> economizer "on" the gas consumption is two time the case without it.
> Could anyone please help me to understand this behaviour? Here
> attached the relative part of my input file.
> 
> Thank you very much,
> Roberto
> !- =========== ALL OBJECTS IN CLASS: CONTROLLER:OUTSIDE AIR
> !===========
> 
> CONTROLLER:OUTSIDE AIR,
> 
> outside air controller, !- Name
> 
> ECONOMIZER, !- EconomizerChoice
> 
> RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> 
> RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> 
> NO LOCKOUT, !- Lockout
> 
> FIXED MINIMUM, !- MinimumLimit
> 
> oa mixer vendita outlet node, !- Control_Node
> 
> oa vendita mixer inlet node, !- Actuated_Node
> 
> 0.0065, !- minimum outside air flow rate {m3/s}
> 
> autosize, !- maximum outside air flow rate {m3/s}
> 
> 24, !- temperature limit {C}
> 
> 10, !- temperature lower limit {C}
> 
> 0, !- enthalpy limit {J/kg}
> 
> vendita reliefair mixer outlet node, !- Relief_Air_Outlet_Node
> 
> primary air loop vendita inlet node, !- Return_Air_Node
> 
> min oa vendita sched; !- Minimum Outside Air Schedule Name
> 
> 
> 
> CONTROLLER:OUTSIDE AIR,
> 
> outside air controller galleria, !- Name
> 
> ECONOMIZER, !- EconomizerChoice
> 
> RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> 
> RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> 
> NO LOCKOUT, !- Lockout
> 
> FIXED MINIMUM, !- MinimumLimit
> 
> oa mixer galleria outlet node, !- Control_Node
> 
> oa galleria mixer inlet node, !- Actuated_Node
> 
> 0.0115, !- minimum outside air flow rate {m3/s}
> 
> autosize, !- maximum outside air flow rate {m3/s}
> 
> 24, !- temperature limit {C}
> 
> 10, !- temperature lower limit {C}
> 
> 0, !- enthalpy limit {J/kg}
> 
> galleria reliefair mixer outlet node, !- Relief_Air_Outlet_Node
> 
> primary air loop galleria inlet node, !- Return_Air_Node
> 
> min oa galleria sched; !- Minimum Outside Air Schedule Name
> 
> 
> 
> CONTROLLER:OUTSIDE AIR,
> 
> outside air controller uffici, !- Name
> 
> ECONOMIZER, !- EconomizerChoice
> 
> RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> 
> RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> 
> NO LOCKOUT, !- Lockout
> 
> FIXED MINIMUM, !- MinimumLimit
> 
> oa mixer uffici outlet node, !- Control_Node
> 
> oa uffici mixer inlet node, !- Actuated_Node
> 
> 0.011, !- minimum outside air flow rate {m3/s}
> 
> autosize, !- maximum outside air flow rate {m3/s}
> 
> 24, !- temperature limit {C}
> 
> 10, !- temperature lower limit {C}
> 
> 0, !- enthalpy limit {J/kg}
> 
> uffici reliefair mixer outlet node, !- Relief_Air_Outlet_Node
> 
> primary air loop uffici inlet node, !- Return_Air_Node
> 
> min oa uffici sched; !- Minimum Outside Air Schedule Name
> 
> 
> [Non-text portions of this message have been removed]
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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