Abstract

Abstract Part I of this paper, somewhat historical in nature, is intended to outline the several chronological steps of development which led to the air preheater, and to show why this equipment is a logical component of most modern plants. Part II comprises brief descriptions of the principal types of air preheaters available. Part III is a discussion of the conditions affecting the selection of a preheater and an outline of the economic problem. Part IV explains by example the economic determination of the optimum size of plate heater for a specific application, and shows the characteristics of an air preheater as applied to a large boiler. General conclusions are summarized and a method of procedure for selecting a heater is proposed. Part V records the detailed calculations corresponding to Part IV, so that this paper may be used as a text or guide in making analyses of similar problems where other basic conditions apply.

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