ISSN Online: 2377-424X
International Heat Transfer Conference 3
A NEW CONCEPT TO THE GENERAL UNDERSTANDING OF THE EFFECT OF LONGITUDINAL CONDUCTION FOR MULTISTREAM COUNTER FLOW HEAT EXCHANGERS
摘要
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.