蒸发式冷凝器强化传热实验研究

Evaporative condenser has been widely used in industry for its energy-conversation, water-conservation and compact structure. The methods of heat transfer enhancement for the evaporative condensers were theoretically analyzed. The experimental apparatus were built up, by which we could test the heat transfer performance of the evaporative condensers and visually study on the distribution of the water film. Packing material was installed between the condensing coil and the inlet louvers in evaporative condenser, Results indicate that, under the same operating conditions, the increases for overall heat and mass transfer coefficient are 7%～17% and 35%～63% respectively, which are mainly due to the reducing of the circulating water temperature and the increasing of heat transfer coefficient between water film and air by 30%～66%.Vision investigations indicate that, twisted tube coils can get better distribution of the water film than plain tube coils, which is benefit for the increases for heat transfer coefficients of the evaporative condensers.