Buildings.Fluid.HeatExchangers.BaseClasses.Internal

Information

Function that internally solves a scalar equation.

Extends from Modelica.Media.Common.OneNonLinearEquation (Determine solution of a non-linear algebraic equation in one unknown without derivatives in a reliable and efficient way).

Package Content

Name	Description
f_nonlinear
Inherited
f_nonlinear_Data	Data specific for function f_nonlinear
solve	Solve f_nonlinear(x_zero)=y_zero; f_nonlinear(x_min) - y_zero and f_nonlinear(x_max)-y_zero must have different sign

Buildings.Fluid.HeatExchangers.BaseClasses.Internal.f_nonlinear

Information

Inputs

Type	Name	Default	Description
Real	x		Independent variable of function
Real	p	0.0	disregaded variables (here always used for pressure)
Real	X[:]	fill(0, 0)	disregaded variables (her always used for composition)
f_nonlinear_Data	f_nonlinear_data		Additional data for the function

Outputs

Type	Name	Description
Real	y	= f_nonlinear(x)

Modelica definition

redeclare function extends f_nonlinear
algorithm 
assert(x>0, "NTU needs to be strictly positive.
Received NTU = "
               + String(x) + "
         Z   = "
               + String(p));
  y := epsilon_ntuZ(NTU=x, Z=p,
       flowRegime=Buildings.Fluid.Types.HeatExchangerFlowRegime.CrossFlowUnmixed);
end f_nonlinear;