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Design and Application Considerations for Heat Exchangers with Enhanced Boiling Surfaces

DOI: 10.1615/ICHMT.1981.AdvCourseHeatExch.140
pages 175-191

R. Antonelli
Union Carbide Benelux BV, Antwerp, Belgium

P. S. O'Neill
Union Carbide Corporation, Tonawanda, New York 14150, USA


Design practice for bare shell-tube reboilers, evaporators, and refrigerant chilled condensers in hydrocarbon services for the Chemical Process Industries is well established, based on more than 50 years of experience. Application of enhanced evaporator tubing such as Union Carbide Corporation "High Flux" in the CPI is relatively more recent, but design procedures have evolved rapidly, for a wide range of enhanced exchanger types, orientations and fluid flow conditions.
This paper surveys and compares design procedures and heat transfer correlations developed for common High Flux exchanger services with those for bare tube. In horizontal shellside evaporators, the relative insensitivity of the enhanced boiling film coefficients to local mass velocity, quality, and tube spacing is discussed. Sizing procedures for large bundles operating at small temperature differences are reviewed. An example is given for an enhanced tube vertical thermosiphon reboiler, showing the individual resistances.
Enhanced surface application examples encountered over the past 10 years in refinery and light hydrocarbon services are given, and the more important design considerations and operation of each type are discussed.

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