CS-11 Application of the Rose-Briggs Method to Shell-and-Tube Finned-Tube Condenser Design

J. W. Palen

This report evaluates the Rose-Briggs Method for condensation of pure vapors on integral-finned tubes in gravity-controlled flow. This method predicts the amount of surface blanketed by condensate. It also accounts for separate condensation mechanisms for fin tips, flanks, and roots and for the effect of fin metal conductivity on the wall temperature of the three condensation regions.

Comparison with the HTRI-modified Katz-Beatty Method shows the Rose-Briggs Method to be more sensitive to metal thermal conductivity and more conservative because the Rose-Briggs Method assumes no heat transfer for the flooded region.

HTRI modified the flooding calculation procedure of the Rose-Briggs Method. The improved method predicts HTRI data for mixtures and for pure vapors as well as or better than the modified Katz-Beatty Method.