The regenerative heat exchanger with periodic veering of the flow

In the given work numerical simulating of the regenerative heat exchanger with a cyclic flow veering is executed in application to the ventilation system. The heat exchanger contains the grained medium consisting of solid spherical elements, storing heat. During a half cycle the entering cold air passes through the grained medium, heating it up to the room temperature. Then the air flow direction is reversed and during another half cycle the exhaust warm air refunds heat to the grained medium. Unlike the former researches, the case of low thermal diffusivity of spherical elements, when heat transfer is determined by the properties of a grained medium, is investigated. The mathematical model describing a cyclic mode of heat exchanger operation is developed. The basic criteria determining heat transfer and their influence on heat regeneration efficiency are revealed.