Buildings.Fluid.Actuators.BaseClasses.Examples

Information

Extends from Buildings.BaseClasses.BaseIconExamples (Icon for Examples packages).

Package Content

Name	Description
EqualPercentageDerivativeCheck
ExponentialDerivativeCheck

Buildings.Fluid.Actuators.BaseClasses.Examples.EqualPercentageDerivativeCheck

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
Real	R	50	Rangeability
Real	delta	0.01	Value where transition occurs
Real	l	0.001	Leakage

Modelica definition

model EqualPercentageDerivativeCheck


 parameter Real R = 50 "Rangeability";
 parameter Real delta = 0.01 "Value where transition occurs";
 parameter Real l = 0.001 "Leakage";
  Real x;
  Real y;
initial equation 
   y=x;
equation 
  x=Buildings.Fluid.Actuators.BaseClasses.equalPercentage(time, R, l, delta);
  der(y)=der(x);
  assert(abs(x-y) < 1E-2, "Model has an error");

end EqualPercentageDerivativeCheck;

Buildings.Fluid.Actuators.BaseClasses.Examples.ExponentialDerivativeCheck

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
Real	a	-1.51	Coefficient a for damper characteristics
Real	b	0.105*90	Coefficient b for damper characteristics
Real	yL	15/90	Lower value for damper curve
Real	yU	55/90	Upper value for damper curve
Real	k0	1E6	Flow coefficient for y=0, k0 = pressure drop divided by dynamic pressure
Real	k1	0.45	Flow coefficient for y=1, k1 = pressure drop divided by dynamic pressure
Real	cL[3]		Polynomial coefficients for curve fit for y < yL
Real	cU[3]		Polynomial coefficients for curve fit for y > yU

Modelica definition

model ExponentialDerivativeCheck


  parameter Real a(unit="")=-1.51 "Coefficient a for damper characteristics";
  parameter Real b(unit="")=0.105*90 "Coefficient b for damper characteristics";
  parameter Real yL = 15/90 "Lower value for damper curve";
  parameter Real yU = 55/90 "Upper value for damper curve";
  parameter Real k0(min=0) = 1E6 
    "Flow coefficient for y=0, k0 = pressure drop divided by dynamic pressure";
  parameter Real k1(min=0) = 0.45 
    "Flow coefficient for y=1, k1 = pressure drop divided by dynamic pressure";
  parameter Real[3] cL(fixed=false) 
    "Polynomial coefficients for curve fit for y < yL";
  parameter Real[3] cU(fixed=false) 
    "Polynomial coefficients for curve fit for y > yU";

  Real x;
  Real y;
initial equation 
 cL[1] = (ln(k0) - b - a)/yL^2;
 cL[2] = (-b*yL - 2*ln(k0) + 2*b + 2*a)/yL;
 cL[3] = ln(k0);

 cU[1] = (ln(k1) - a)/(yU^2 - 2*yU + 1);
 cU[2] = (-b*yU^2 - 2*ln(k1)*yU - (-2*b - 2*a)*yU - b)/(yU^2 - 2*yU + 1);
 cU[3] = (ln(k1)*yU^2 + b*yU^2 + (-2*b - 2*a)*yU + b + a)/(yU^2 - 2*yU + 1);

   y=x;
equation 
  x=Buildings.Fluid.Actuators.BaseClasses.exponentialDamper(y=time,a=a,b=b,cL=cL,cU=cU,yL=yL,yU=yU);
  der(y)=der(x);
  assert(abs(x-y) < 1E-2, "Model has an error");
end ExponentialDerivativeCheck;