Buildings.Fluid.Utilities

Information

Package Content

Name	Description
extendedPolynomial	Polynomial that is linearly extended at user specified values
polynomial	Polynomial, used because OpenModelica 1.4.3 does not expand the sum() into a scalar
Examples	Collection of models that illustrate model use and test models
BaseClasses	Package with base classes for Buildings.Fluid.Utilities

Buildings.Fluid.Utilities.extendedPolynomial

Information

y = ∑_i=1ⁿ c_i x^i-1

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Default	Description
Real	x		x value
Real	c[:]		Polynomial coefficients
Real	xMin		Minimum x value for polynomial
Real	xMax		Maximum x value for polynomial

Outputs

Type	Name	Description
Real	y	y value

Modelica definition

function extendedPolynomial 
  "Polynomial that is linearly extended at user specified values"
  annotation(derivative=BaseClasses.der_extendedPolynomial);
  extends Modelica.Icons.Function;
  input Real x "x value";
  input Real[:] c "Polynomial coefficients";
  input Real xMin "Minimum x value for polynomial";
  input Real xMax "Maximum x value for polynomial";
  output Real y "y value";
protected 
 Integer N = size(c,1) "Number of coefficients";
algorithm 
if x < xMin then
   y := c[1];
   for i in 2:N loop
     y := y + xMin^(i - 1)*c[i] + (x - xMin)*(i - 1)*xMin^(i - 2)*c[i];
   end for;
  elseif x < xMax then
   y := c[1];
   for i in 2:N loop
     y := y + x^(i - 1)*c[i];
  end for;
  else
     y := c[1];
     for i in 2:N loop
       y := y + xMax^(i - 1)*c[i] + (x - xMax)*(i - 1)*xMax^(i - 2)*c[i];
    end for;
  end if;
end extendedPolynomial;

Buildings.Fluid.Utilities.polynomial

Information

Function that computes

y = ∑_i=1ⁿ c_i x^i-1

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Default	Description
Real	c[:]		Coefficients
Real	x		Independent variable

Outputs

Type	Name	Description
Real	y	Dependent variable

Modelica definition

function polynomial 
  "Polynomial, used because OpenModelica 1.4.3 does not expand the sum() into a scalar"
  extends Modelica.Icons.Function;
  input Real[:] c "Coefficients";
  input Real x "Independent variable";
  output Real y "Dependent variable";
algorithm 
 y := c[1];
 for i in 2 : size(c,1) loop
   y := y + x^(i-1) * c[i];
 end for;
end polynomial;