Heat is to be transferred from one process stream to another by means of a double pipe heat exchanger. The hot fluid flows in a $1 \mathrm{in}$. Sch. 40 tube, which is inside (and concentric with) a 2 in. Sch. 40 tube, with the cold fluid flowing in the annulus between the tubes, in the opposite direction. If both tubes are to carry the fluids at a velocity of $8 \mathrm{ft} / \mathrm{s}$ and the total equivalent length of the tubes is $1300 \mathrm{ft}$, what pump power is required to circulate the colder fluid? The cold fluid properties at an average temperature are $ho=55 \mathrm{lb}_{\mathrm{m}} / \mathrm{ft}^{3}$, $\mu=8 \mathrm{cP}$.