.ClaRa.SubSystems.Furnace.HopperSlice_L4_AdditionalAir.Burning_time .ClaRa.SubSystems.Furnace.HopperSlice_L4_AdditionalAir.Burning_timeModel for the buring time
model Burning_time = ClaRa.Components.Furnace.GeneralTransportPhenomena.BurningTime.ConstantBurningTime;