.BuildSysPro.IBPSA.ThermalZones.ReducedOrder.Examples.SimpleRoomFourElementsTraceSubstance.Medium .BuildSysPro.IBPSA.ThermalZones.ReducedOrder.Examples.SimpleRoomFourElementsTraceSubstance.Mediumpackage Medium = IBPSA.Media.Air(extraPropertiesNames = {"C_flow"});