Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 3
August, 7-12, 1966, Chicago, USA

A NEW CONCEPT TO THE GENERAL UNDERSTANDING OF THE EFFECT OF LONGITUDINAL CONDUCTION FOR MULTISTREAM COUNTER FLOW HEAT EXCHANGERS

Get access (open in a dialog) DOI: 10.1615/IHTC3.820
pages 159-169

Abstrakt

A general understanding of the effect of longitudinal conduction on fluid temperatures for a multistream heat exchanger is obtained from a plot of a characteristic function. Mathematically, three corresponding sets of data are found to be real and distinct except for one possible pair of zero-double-roots for the balanced flow case. This assures four different forms of solutions. The function suggests the importance of the diagonal terms in the exact solutions Therefore, an order of magnitude analysis is made on the basis of this function and the diagonal terms. A new descriptive parameter is derived and the importance of flowrate can be seen. An inefficiency plot is determined from an example analysis of a two stream symmetric case. Performance equations, correction formula, and quantitative design charts are presented. The effect of large temperature differences on the ends is discussed mathematically.