Abstract
Cooling towers are necessary units used to cool down hot water from industrial processes. These units use high air volume metric flow rate and make up water. These are the disadvantages of using cooling towers. This research applied bubbling technique to cool down hot water. The bubble column was used in this study at different air flow rate. Hot water filled in the column was set at 40°C. Water loss and the reduction of temperature of water were observed. The results showed that the highest evaporation rate of water and the shortest of bubbling time were observed at the highest air flow rate. On the other hand, the lowest amount of air used was observed at the lowest of air flow rate which is the optimum condition of this study. In addition, the rate of heat transfer increases when the turbulent flow in the bubble column was formed.
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