Part-II average condensing heat transfer coefficient on horizontal low finned tubes

摘要

A theoretical model was developed to predict the average condensing heat transfer coefficient for film condensation on horizontal low finned tubes. In the present study, the tube is divided into three regions; unflooded, flooded, and dripped ones. Then, the condensed regions, i.e. unflooded and flooded ones are divided into two parts; thin and thick layers. The heat transfer is considered only in the thin layer part. In the dripped region the condensate covers all the fins, thus the rate of heat transfer is neglected. The average heat transfer coefficient for condensation of saturated steam on twelve low finned tubes was determined experimentally. Also, other experimental data for condensation of refrigerants and steam were considered for the sake of comparison with the predicted values. This comparison shows that the deviation of these values were within ±15 and ±17 percent for steam and refrigerants, respectively.