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Re: [EnergyPlus_Support] Economizer does not function properly
Check that the return air temperature is greater than the outside air
temperature and the outside air temperature is between 12.8C and 21.1C,
the economizer should open under these conditions.
CONTROLLER:OUTSIDE AIR,
RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
21.1, !- temperature limit {C}
12.8, !- temperature lower limit {C}
JV Dirkes II wrote:
>
> Dear E+ Forum,
>
> The air handler in my current model has an economizer which is staying
> at the fixed minimum position at all times on the Winter Design Day.
> As a result, the cooling coil operates to create the discharge air
> temperature setpoint. I expect that the economizer should increase
> the outdoor air flow to accomplish the same result, but it does not.
>
> I've shown the critical objects below and hope someone can direct me
> to the problem. Thank you!
>
> p.s., I will upload it, too.
>
> BRANCH,
> Branch_AirLoop_AH1, !- Branch Name
> Autosize, !- Maximum Branch Flow Rate {m3/s}
> OUTSIDE AIR SYSTEM, !- Comp1 Type
> OASystem_AH1, !- Comp1 Name
> NodeOut_RFan_AH1, !- Comp1 Inlet Node Name
> NodeOut_MA_AH1, !- Comp1 Outlet Node Name
> PASSIVE, !- Comp1 Branch Control Type
> DXSystem:AirLoop, !- Comp2 Type
> DXAirLoop_AH1, !- Comp2 Name
> NodeOut_MA_AH1, !- Comp2 Inlet Node Name
> NodeOut_ClgCoilAir_AH1, !- Comp2 Outlet Node Name
> PASSIVE, !- Comp2 Branch Control Type
> FAN:SIMPLE:VARIABLEVOLUME, !- Comp3 Type
> SFan_AH1, !- Comp3 Name
> NodeOut_ClgCoilAir_AH1, !- Comp3 Inlet Node Name
> NodeOut_SF_AH1, !- Comp3 Outlet Node Name
> ACTIVE, !- Comp3 Branch Control Type
> COIL:WATER:SIMPLEHEATING,!- Comp4 Type
> HtgCoil_AH1, !- Comp4 Name
> NodeOut_SF_AH1, !- Comp4 Inlet Node Name
> NodeOut_Air_AH1, !- Comp4 Outlet Node Name
> PASSIVE; !- Comp4 Branch Control Type
>
> SET POINT MANAGER:MIXED AIR,
> SPMgr_MixedAir_AH1, !- Name
> TEMP, !- Control variable:
> NodeOut_Air_AH1, !- reference set point node name
> NodeOut_ClgCoilAir_AH1, !- fan inlet node name
> NodeOut_SF_AH1, !- fan outlet node name
> NodeOut_MA_AH1; !- Name of the set point Node or Node List
>
> CONTROLLER:OUTSIDE AIR,
> OAController_AH1, !- Name
> ECONOMIZER, !- EconomizerChoice
> RETURN AIR TEMP LIMIT, !- ReturnAirTempLimit
> NO RETURN AIR ENTHALPY LIMIT, !- ReturnAirEnthalpyLimit
> NO LOCKOUT, !- Lockout
> FIXED MINIMUM, !- MinimumLimit
> NodeOut_MA_AH1, !- Control_Node
> NodeIn_OA_AH1, !- Actuated_Node
> Autosize, !- minimum outside air flow rate {m3/s}
> Autosize, !- maximum outside air flow rate {m3/s}
> 21.1, !- temperature limit {C}
> 12.8, !- temperature lower limit {C}
> , !- enthalpy limit {J/kg}
> , !- dew point temperature limit {C}
> , !- electronic enthalpy limit curve name
> NodeOut_EA_AH1, !- Relief_Air_Outlet_Node
> NodeOut_RFan_AH1, !- Return_Air_Node
> , !- Minimum Outside Air Schedule Name
> , !- Name of VENTILATION:MECHANICAL object
> , !- Time of Day Economizer Control
> Schedule Name
> NO, !- High Humidity Control Flag
> ParkingLobbies, !- Humidistat Control Zone Name
> 1, !- High Humidity Outside Air Flow Ratio
> Yes; !- Control High Indoor Humidity based on
> Outdoor Humidity Ratio
>
> DXSystem:AirLoop,
> DXAirLoop_AH1, !- Name of DX Cooling Coil System
> SchCpct_AlwaysOn, !- Availability schedule
> NodeOut_MA_AH1, !- DX Cooling Coil System inlet node name
> NodeOut_ClgCoilAir_AH1, !- DX Cooling Coil System outlet node name
> NodeOut_Air_AH1, !- DX Cooling Coil System Control Node
> COIL:DX:COOLINGBypassFactorEmpirical, !- Cooling coil type
> ClgCoil_AH1, !- Cooling coil name
> None, !- Dehumidification Control Type
> Yes, !- Run on Sensible Load
> No; !- Run on Latent Load
>
> SET POINT MANAGER:SCHEDULED,
> SPMgr_Sched_HC_AH1, !- Name
> TEMP, !- Control variable
> SchCpct_DischAir_AH1, !- Schedule Name
> NodeOut_Air_AH1; !- Name of the set point Node or Node List
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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