TAILIEUCHUNG - Heat Transfer Handbook part 86

Heat Transfer Handbook part 86. The Heat Transfer Handbook provides succinct hard data, formulas, and specifications for the critical aspects of heat transfer, offering a reliable, hands-on resource for solving day-to-day issues across a variety of applications. | COMPACT HEAT EXCHANGERS 845 d Bar and plate e Bar and plate f Bar and plate Header g Formed plate fin h Formed plate fin i Dimpled strut tube Figure Some compact heat exchanger elements. Courtesy of Harrison Radiator Division. 3. Surfaces with flow normal to banks of smooth tubes. Unlike the radial low fin tubes smooth round tubes are expanded into fins that can accept a number of tube rows as shown in Fig. . Holes may be stamped in the fin with a drawn hub or foot to improve contact resistance or as a spacer between successive fins as shown or brazed directly to the fin with or without a hub. Other types reduce the flow resistance outside the tubes by using flattened tubes and brazing as indicated in Fig. and c. Flat tubing is made from strips similar to the manufacture of welded circular tubing but is much thinner and is joined by soldering or brazing rather than welding. 846 HEAT EXCHANGERS The designation considers staggered S and in-line I arrangements of ti l s and identifies transverse and longitudinal pitch ratios. The suffix s indicates data correlation from steady-state tests. All other data were correlated from a transient technique. Examples include the surface s which is a staggered arrangement with data obtained via steady-state tests with transverse pitch-to-diameter ratio of and longitudinal pitch-to-diameter ratio of T25. The urrface has nn inline arrangement with data obtained from transient tests with both transverse and longitudinal pitch-to-diameter ratios . 4. Plate fin surfaces. These are shown in Figs. through i. a The plain fin is characterized by long uninterrupted flow passages and is designated by a numeral that indicates the number offins per inch. The suffix T is appended when the passages are of definite trianguaar luqTe. Exampees are the surfaces and . b The louvered fin is characterized by fins that are cut and bent into the flow stream at frequent intervals

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