Derivative of specific heat capacity wrt. pressure at constant specific enthalpy in vapor region for given pressure and specific enthalpy
function dcp2ph_Ph input Units.SI.AbsolutePressure p "Pressure"; input Units.SI.SpecificEnthalpy h "Specific enthalpy"; output Real dcpph "Derivative of specific heat capacity wrt. pressure at constant specific enthalpy"; end dcp2ph_Ph;