THE HEAT AND MASS TRANSFER CHARACTERISTICS IN A VERTICAL-TUBE EVAPORATIVE CONDENSER

摘要

Evaporative cooling is used to reduce temperature in different fluids in industrial and air conditioning processes. The processes of coolers involve two phase flow between air and water, the heat-mass transfer and its coupled process. In this study, the heat and mass transfer characteristics in a verticaltube evaporative condenser have been investigated. A steady-state, one-dimensional model of cooler performance was formulated and validated by experimental measurement taken in this exchanger. The heat resistance at the air-water interface predominates over all other heat resistance and the heat and mass transfer coefficients occur at the airwater interface. With the enhancing experiment of the spring inserts, the heat and mass transfer coefficients might be increased 5% to 17%. The findings may provide more information to the design of vertical-tube evaporative condensers.