modelSpeedCorrectionSensible

Sensible heat wheels
Diagram of SpeedCorrectionSensibleOpen the diagram
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Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).

Information

This model calculates the power consumption and the sensible heat exchanger effectiveness correction of a sensible heat wheel when it is in the different rotational speed.

  • The power consumption of this wheel is calculated as

    P = P_nominal * uSpe / eta,

    where P_nominal is the nominal wheel power consumption, uSpe is the wheel speed ratio, and eta is the motor percent full-load efficiency, which is calculated as

    eta = eff(uSpe=x) / eff(uSpe=1),

    where eff(uSpe=x) is the motor efficiency when the speed ratio is x. The efficiency eta is obtained based on a cubic hermite spline interpolation of the motor percent full-load efficiency dataset (see Buildings.Fluid.HeatExchangers.ThermalWheels.Data.Characteristics.MotorEfficiency). Please note that uSpe/eta must be less or equal to 1.

  • The sensible heat exchanger effectiveness correction is calculated based on a cubic hermite spline interpolation of the sensible heat exchanger effectiveness dataset (see Buildings.Fluid.HeatExchangers.ThermalWheels.Data.Characteristics.HeatExchangerEffectiveness).

Parameters

TypeNameDefaultDescription
Buildings.Fluid.HeatExchangers.ThermalWheels.Data.GenericperRecord with performance data
Efficiency
Real[:]xSpeif per.use_defaultMotorEfficiencyCurve then per.relMotEff_default.y else per.relMotEff.uSpex-axis support points of the power efficiency curve
RealyEtaif per.use_defaultMotorEfficiencyCurve then per.relMotEff_default.eta else per.relMotEff.etay-axis support points of the power efficiency curve

Connectors

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Interfaces.RealInputuSpeWheel speed ratio
Buildings.Controls.OBC.CDL.Interfaces.RealOutputPElectric power consumption
Buildings.Controls.OBC.CDL.Interfaces.RealOutputepsSenCorSensible heat exchanger effectiveness correction

Revisions

  • July 9, 2025, by Michael Wetter:
    Refactored implementation to avoid repetitive calculation of derivatives for spline interpolation.
  • May 28, 2024, by Sen Huang:
    First implementation.