New developments in prime-mover and process equipment have created a more urgent need for compact heat-transfer surfaces. This paper presents basic heat-transfer and flow-friction design data for five such surfaces. Three of these are variations of the finned-circular-tube type. The other two are flow inside small rectangular (6:1 aspect ratio) and circular tubes. In addition to the use of conventional nondimensional heat-transfer and flow-friction correlations, the various surfaces are compared on a heat-transfer coefficient versus flow-friction-horsepower basis. The results represent a continuation of a program started in 1945 and bring to a total of 39 the number of compact surfaces for which design data have been reported.

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