A heat exchanger design is generally considered good if o hA on hot and cold fluid sides are about..

A heat exchanger design is generally considered good if ohA
on hot and cold fluid sides are about the same. Because of very low values of
heat transfer coefficients with gas flows compared to those for liquid flows, a
considerable amount of surface area is needed on the gas side. It can be
achieved by increasing either the fin density or the fin height, or both. High
fin height may be structurally very weak. An alternative way is to put two
layers of fins in between liquid tubes as shown in the Fig. P4.8a. Figure P4.8b
represents a general unit fin section. Show that the fin efficiency for
View complete question »

A heat exchanger design is generally considered good if ohA
on hot and cold fluid sides are about the same. Because of very low values of
heat transfer coefficients with gas flows compared to those for liquid flows, a
considerable amount of surface area is needed on the gas side. It can be
achieved by increasing either the fin density or the fin height, or both. High
fin height may be structurally very weak. An alternative way is to put two
layers of fins in between liquid tubes as shown in the Fig. P4.8a. Figure P4.8b
represents a general unit fin section. Show that the fin efficiency for this
fin is

Perform the analysis using the solutions presented in the
text for thin fins with (a) an adiabatic fin tip, and (b) finite heat transfer
at the fin tip without solving any

differential equations. Make an appropriate energy balance
at the T‘ point. Mention explicitly any additional assumptions that are needed
for your analysis.

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