Derivative of dew point temperature calculation for moist air.
function der_pW_TDewPoi_amb extends Modelica.Icons.Function; input Modelica.SIunits.Temperature T "Dew point temperature"; input Real dT; output Real dp_w "Differential of water vapor partial pressure"; end der_pW_TDewPoi_amb;
extends Annex60.Utilities.Psychrometrics.Functions.BaseClasses.pW_TDewPoi_amb
as this gives a compile time error in OpenModelica as the input argument T
cannot be found.