Buildings.HeatExchangers.CoolingTowers.Correlations.Examples

Information

Package Content

Name	Description
YorkCalc	Example for yorkCalc correlation
YorkCalcDerivativeCheck

Buildings.HeatExchangers.CoolingTowers.Correlations.Examples.YorkCalc

Parameters

Type	Name	Default	Description
Temperature	TRan	5.56	Range temperature (water in - water out) [K]
Temperature	TAirInWB	25.55 + 273.15	Inlet air wet bulb temperature [K]

Modelica definition

model YorkCalc "Example for yorkCalc correlation" 
  
  parameter Modelica.SIunits.Temperature TRan = 5.56 
    "Range temperature (water in - water out)";
  parameter Modelica.SIunits.Temperature TAirInWB = 25.55 + 273.15 
    "Inlet air wet bulb temperature";
  Modelica.SIunits.MassFraction x "Independent variable";
  Modelica.SIunits.Temperature TApp_Wat 
    "Approach temperature as a function of FRWat";
  Modelica.SIunits.Temperature TApp_Air 
    "Approach temperature as a function of FRAir";
  
equation 
  x = 0.25+time;
  TApp_Wat=Buildings.HeatExchangers.CoolingTowers.Correlations.yorkCalc(TRan=TRan,
                                                                    TWB=TAirInWB,
                                                                    FRWat=x,
                                                                    FRAir=1);
  TApp_Air=Buildings.HeatExchangers.CoolingTowers.Correlations.yorkCalc(TRan=TRan,
                                                                    TWB=TAirInWB,
                                                                    FRWat=1,
                                                                    FRAir=x);
  
end YorkCalc;

Buildings.HeatExchangers.CoolingTowers.Correlations.Examples.YorkCalcDerivativeCheck

Information

This example checks whether the function derivative is implemented correctly. If the derivative implementation is not correct, the model will stop with an assert statement.

Parameters

Type	Name	Default	Description
Temperature	TRan	5.56	Range temperature (water in - water out) [K]
Temperature	TAirInWB	35.55 + 273.15	Inlet air wet bulb temperature [K]

Modelica definition

model YorkCalcDerivativeCheck 
  
  parameter Modelica.SIunits.Temperature TRan = 5.56 
    "Range temperature (water in - water out)";
  parameter Modelica.SIunits.Temperature TAirInWB = 35.55 + 273.15 
    "Inlet air wet bulb temperature";
  Real x;
  Real y;
initial equation 
   y=x;
equation 
  x=CoolingTowers.Correlations.yorkCalc(TRan=TRan,      TWB=TAirInWB,
                                                        FRWat=time,
                                                        FRAir=1.1);
  der(y)=der(x);
  assert(abs(x-y) < 1E-2, "Model has an error");
end YorkCalcDerivativeCheck;