Buildings.Fluid.CHPs.BaseClasses.Functions

Information

This package contains functions for used in the blocks. The functions are used in the blocks Buildings.Fluid.CHPs.BaseClasses.

Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).

Package Content

Name	Description
polynomialtrivariate	Polynominal function used for efficiency calculation

Buildings.Fluid.CHPs.BaseClasses.Functions.polynomialtrivariate

Polynominal function used for efficiency calculation

Information

This function computes a trivariate fifth order polynomial. The polynomial has the form

y = a₁ + a₂ x₁² + a₃ x₁ + a₄ x₂² + a₅ x₂ + a₆ x₃² + a₇ x₃ + a₈ x₁² x₂² + a₉ x₁ x₂
+ a₁₀ x₁ x₂² + a₁₁ x₁² x₂ + a₁₂ x₁² x₃² + a₁₃ x₁ x₃ + a₁₄ x₁ x₃² + a₁₅ x₁² x₃ + a₁₆ x₂² x₃² + a₁₇ x₂ x₃ + a₁₈ x₂ x₃²
+ a₁₉ x₂² x₃ + a₂₀ x₁² x₂² x₃² + a₂₁ x₁² x₂² x₃ + a₂₂ x₁² x₂ x₃² + a₂₃ x₁ x₂² x₃² + a₂₄ x₁² x₂ x₃ + a₂₅ x₁ x₂² x₃ + a₂₆ x₁ x₂ x₃² + a₂₇ x₁ x₂ x₃

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

Inputs

Type	Name	Description
Real	x1	Independent variable
Real	x2	Independent variable
Real	x3	Independent variable
Real	a[27]	Coefficients

Outputs

Type	Name	Description
Real	y	Result

Modelica definition

function polynomialtrivariate "Polynominal function used for efficiency calculation" extends Modelica.Icons.Function; input Real x1 "Independent variable"; input Real x2 "Independent variable"; input Real x3 "Independent variable"; input Real a[27] "Coefficients"; output Real y "Result"; protected Real x1Sq = x1^2; Real x2Sq = x2^2; Real x3Sq = x3^2; algorithm y := a[1] + a[2]*x1Sq + a[3]*x1 + a[4]*x2Sq + a[5]*x2 + a[6]*x3Sq + a[7]*x3 + a[8]*x1Sq*x2Sq + a[9]*x1*x2 + a[10]*x1*x2Sq + a[11]*x1Sq*x2 + a[12]*x1Sq*x3Sq + a[13]*x1*x3 + a[14]*x1*x3Sq + a[15]*x1Sq*x3 + a[16]*x2Sq*x3Sq + a[17]*x2*x3 + a[18]*x2*x3Sq + a[19]*x2Sq*x3 + a[20]*x1Sq*x2Sq*x3Sq + a[21]*x1Sq*x2Sq*x3 + a[22]*x1Sq*x2*x3Sq + a[23]*x1*x2Sq*x3Sq + a[24]*x1Sq*x2*x3 + a[25]*x1*x2Sq*x3 + a[26]*x1*x2*x3Sq + a[27]*x1*x2*x3; end polynomialtrivariate;