Abstract
Abstract Four types of disk-on-tube extended-surface heat exchangers are discussed in this paper, i.e., interlocking castiron sections of nine disks each; die-cast aluminum-alloy disks each with shroud and hub; two surfaces die-pressed from wrought-iron sheet, each with a flue; and one a sixteen-pronged star. Data for both the cast-iron and aluminum surfaces were obtained from tests of full-sized economizers in conjunction with boiler tests, while data on the wrought-iron disks were obtained from laboratory studies. Details are given of the testing procedure, and the results in terms of effectiveness of the various surfaces are analyzed and correlated.
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