The Heat Transfer Performance with Pumping Power for a Particle Bed Heat Exchanger

입자층(粒子層)을 이용한 열교환기(熱交換器)에서 소요동력(所要動力)에 따른 전열특성(傳熱特性)에 관(關)한 연구(硏究)

In order to improve the performance of heat exchanger, fluidized bed is often employed. The experiments are carried out in fluidized double pipe parallel flow heat exchanger in which finned tube is vertically immersed. And the heat transfer coefficients between the heated tube and fluidized bed of alumina beads(dp=0.41, 0.54, 0.65, 0.77mm) are calculated as a function of air fluidized velocity and pumping power. The effects of particle size, static bed height and pumping power on the heat transfer coefficients are investigated. And the heat transfer coefficients are compared with that of single phase forced convection heat exchanger. In particular, the heat transfer performance of each type heat exchanger is evaluated in relation to the pumping power.