Abstract
The basic feature of the paper is the development of the exact characteristic equation for a feedheating train composed of a number of cascaded heater groups in which each heater is taken to be of a rather general type. With the aid of this equation a systematic computational procedure may be devised which permits the variation of the train performance resulting from changes in the heater characteristics to be exactly and easily determined. A differential method, suitable for most practical analyses, and based on a series expansion of the characteristic equation, is also presented in some detail. The relation of the content of the paper to the ultimate objective of estimating variations in cycle heat rate resulting from changes in feedheating train performance is discussed in Appendix III.
Appendix II contains an example of a complete feedheating calculation and compares the results of exact analyses of variations with those obtained by the differential method.
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