.ClaRa_Obsolete.Components.Furnace.BaseClasses.HopperBase.RadiationTimeConstant .ClaRa_Obsolete.Components.Furnace.BaseClasses.HopperBase.RadiationTimeConstantmodel RadiationTimeConstant = ClaRa.Components.Furnace.GeneralTransportPhenomena.ThermalCapacities.ThermalLowPass;