.AixLib.Fluid.BoilerCHP.ModularCHP.BaseClasses.ModularCHP_PowerUnit.Medium_Fuel .AixLib.Fluid.BoilerCHP.ModularCHP.BaseClasses.ModularCHP_PowerUnit.Medium_Fuelpackage Medium_Fuel = AixLib.DataBase.CHP.ModularCHPEngineMedia.NaturalGasMixture_TypeAachen;