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한성필(S.-P. Han),박태균(T.-K. Park),김내현(N.-H. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Thermal performance analysis was conducted for the cross-flow enthalpy heat exchanger. Appropriate heat transfer coefficient and friction factor equations for laminar channel flow were selected, and the heat exchanger was analyzed using the unmixed cross-flow ε-NTU relationship. It is shown that the simple approach reasonably predict the available heat transfer and the pressure drop data. Additional issues on the entrance length, fin efficiency, mass transfer through the membrane paper are discussed.
신태룡(T.-R. Shin),이응렬(E.-R. Lee),한성필(S.-P. Han),김내현(N.-H. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The air and water flow distribution are experimentally studied for a round header - microchannel tube configuration. The number of tubes were 10 and 30. The effects of tube outlet direction, tube protrusion depth, mass flux, and quality are investigated. For the downward flow configuration, the water flow distribution is significantly affected by the tube protrusion depth. For flush-mounted configuration, most of the water flows at the frontal part of the header. As the protrusion depth increases, the water is forced to the rear part of the header. However, for the upward flow configuration, the effect of the protrusion depth is negligible. As the mass flux or the quality increases, the water flow is forced to the rear part of the header. Negligible difference on the water flow distribution is observed between the parallel flow and the reverse flow configuration.