In the double$-$pipe heat exchanger, the

outer pipe is $1(\frac{1}{2})"$Sch steel pipe, while

the inner pipe is $\frac{7}{816}$ BWG copper type.

While benzene flowing through the inner

tube at a speed of $1\mathrm{.}52\frac{m}{second}$ cools

from $60\mathrm{.}6C$ to $26\mathrm{.}1C,$ the cooling water

flowing in the opposite direction in the

annular space at a speed of $1\mathrm{.}22\frac{m}{second}$

enters $15\mathrm{.}6C$ and heats up to $26\mathrm{.}7C.$

What are the heat transfer coefficients of

each stream and the entire pipe length,

which can be $\frac{L}{D}>150,$ ignoring the

resistance coming from the wall, compared

to the outer face of the inner pipe?