ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
THE EFFECTS OF NON-UNIFORM HEAT TRANSFER COEFFICIENTS IN THE DESIGN OF FINNED TUBE AIR-COOLED HEAT EXCHANGERS
要約
A theoretical design investigation of annular finned tube air-cooled heat exchangers is presented. The calculations determine the temperature distribution and heat flowrate through seven types of high fin tubes, allowing for the non-uniformity of the fin side heat transfer coefficient. The results are compared with those based on present design methods in which a uniform heat transfer coefficient is assumed on the finned side of the tube. Significant differences (up to 400 percent) are found between these two calculations. The results also show that a reduction in air side velocity does not necessarily decrease the duty of the heat exchanger.