.BuildSysPro.IBPSA.Media.Specialized.Air.PerfectGas.sublimationPressureIce_der .BuildSysPro.IBPSA.Media.Specialized.Air.PerfectGas.sublimationPressureIce_derfunction sublimationPressureIce_der = Modelica.Media.Air.MoistAir.sublimationPressureIce_der;