blockCoolingCoilValve

Cooling coil valve position control sequence
Diagram of CoolingCoilValveOpen the diagram
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Information

Control sequence that outputs the cooling coil valve position. The implementation is according to the ALC EIKON control sequence implementation in one of LBNL buildings.

Parameters

TypeNameDefaultDescription
Controller
Realalc_prop_k1/100Recorded proportional controller gain
Realalc_int_k0.5/100Recorded integral controller gain
Modelica.Units.SI.TemperatureTSupHighLim50*(5/9) - 32*(5/9) + 273.15Recorded minimum supply air temperature for defining the upper limit of the valve position
Modelica.Units.SI.TemperatureTSupHigLim42*(5/9) - 32*(5/9) + 273.15Recorded maximum supply air temperature for defining the upper limit of the valve position
Modelica.Units.SI.Timeinterval15Recorded interval at which integration part of the output gets updated
Advanced › Parameters
Realalc_k_unit_conv9/5Unit converter for controller gains from the ALC control logic
Enable
Modelica.Units.SI.TemperatureTOutCooCut50*(5/9) - 32*(5/9) + 273.15Recorded outdoor air temperature cooling threshold
Modelica.Units.SI.TemperatureTOutDelta2*(5/9) - 32*(5/9) + 273.15Recorded outdoor air temperature cooling threshold hysteresis delta
RealFanFeeCut15/100Recorded fan feedback threshold
RealFanFeeDelta10/100Recorded fan feedback threshold hysteresis delta
Advanced › Controller
BooleanreverseActingfalseController reverse action
Realkalc_prop_k*alc_k_unit_convProportional controller gain
RealTik*interval/(alc_int_k*alc_k_unit_conv)Integral controller gain
RealuMax1Maximum controller signal
RealuMin0Minimum controller signal

Connectors

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Interfaces.BooleanInputuFanStaOptional additional status signal
Buildings.Controls.OBC.CDL.Interfaces.RealInputuFanFeeSupply fan feedback
Buildings.Controls.OBC.CDL.Interfaces.RealInputTSupMeasured supply air temperature (SAT)
Buildings.Controls.OBC.CDL.Interfaces.RealInputTSupSetSupply air temperature setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealInputTOutMeasured outdoor air temperature
Buildings.Controls.OBC.CDL.Interfaces.RealOutputyCooValCooling valve control signal

Components

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Reals.PIDWithResetlimPICustom PI controller
Buildings.Controls.OBC.CDL.Reals.LinehigLimDefines lower limit of the cooling valve signal at low range SATs

Revisions

  • August 29, 2023, by Hongxiang Fu:
    Because of the removal of Logical.And3 based on ASHRAE 231P, replaced it with a stack of two Logical.And blocks. This is for #2465.
  • April 09, 2018, by Milica Grahovac:
    First implementation.