Circle the following statements as true or false. (a) T F Overall extended surface efficiency is…

Circle the following statements as true or false.

(a) T F Overall extended surface efficiency is always higher
than the fin efficiency in a plate-fin exchanger.

(b) T F The fin efficiency of low-finned tubes is higher
than that of the highfinned tubes if the only difference is the fin height.

(c) T F The fin efficiency is determined from the parameter
m‘, where m = (2h/k)1=2. In this equation, k is the thermal conductivity of the
fluid that flows over the finned surface.

(d) T F The fin efficiency of a specified fin is higher for
water flows compared to air flows at the same velocity.

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