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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

STUDY ON NONCONDENSABLE VAPOR ACCUMULATION IN AIR-COOLED CONDENSERS

Get access (open in a dialog) DOI: 10.1615/IHTC7.2220
pages 263-268

Résumé

The accumulation of noncondensables from condensing vapor in crossflow multitube heat exchangers with intube condensation results in low local heat transfer coefficients and thus in reduced efficiency. The Berg and Berg [1] analytical method developed for "backflow" was extended to determine the effective length of each tube which is not blanketed by noncondensables. The resulting simultaneous equations for determination of the effective length of the tube were solved numerically. It allowed the development of equations for the maldistribution of vapor and for the total capacity of the unit. The method which is also presented graphically is easily applicable not only for horizontal but also for vertical bundles of tubes, smooth or finned, connected to the common inlet and outlet plenums. Effective heat transfer area predictions were compared with experimental tests, and the agreement was found to be satisfactory.