modelOffDesignOperation

Calculation of operation for non-nominal/off-design conditions
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Information

This model calculates the adiabatic efficiency (reference is the higher heating value (includes vaporization enthalpy)) at off-design conditions for an operating point from a characteristic chart in dependency on:

  • Nominal return temperature (TColdNom)
  • Nominal temperature difference (TColdNom-THotNom)
  • Relative temperature difference
  • Relative water mass flow

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.HeatFlowRateQ_flow_nominal50000Design thermal capacity
Design
Modelica.Units.SI.TemperatureTSup_nominal273.15 + 80Design supply temperature
Modelica.Units.SI.TemperatureTRet_nominal273.15 + 60Design return temperature
Advanced
StringfilenameModelicaServices.ExternalReferences.loadResource("modelica://AixLib/Resources/Data/Fluid/BoilerCHP/BaseClasses/GenericBoiler/Boiler_Generic_Characteristic_Chart.sdf")Filename for generic boiler curves

Connectors

TypeNameDefaultDescription
AixLib.Controls.Interfaces.BoilerControlBusboiBusBoiler bus

Components

TypeNameDefaultDescription
Modelica.Blocks.Math.AdddTMeaMeasured temperature spread
Modelica.Blocks.Math.DivisionrelMFlowCalculate relative mass flow rate
Modelica.Blocks.Sources.ConstantconMFlowNomNominal mass flow rate
Modelica.Blocks.Routing.Multiplex4multiplex4
SDF.NDTableboiEffCharacteristic chart of adiabatic efficiency
Modelica.Blocks.Math.DivisionrelTemSprRelative temperature spread
Modelica.Blocks.Sources.ConstantdT_nominalNominal temperature spread

Contents

NameDescription
MediumMedium in the component

Revisions

  • June, 2023 by Moritz Zuschlag; David Jansen
    First Implementation (see issue #1147)