This function is used as a guard for property functions using pTX as an input. Property functions for two-phase media using pressure and temperature as inputs shall not be used close to the phase boundary in order to avoid errors and high deviations for just small deviations in the input arguments. The refrigerant state can not be determined in the two-phase region using pressure and temperature.
function phaseBoundaryAssert
extends Modelica.Icons.Function;
input SI.Pressure p "Refrigerant pressure";
input SI.Temperature T "Refrigerant temperature";
end phaseBoundaryAssert;