Chapter 8, Problem 8.49P

Cooling water flows through the $\text{25}.\text{4-mm}$ -diameter thin-walled tubes of a steam condenser at 1 m/s. and a surface temperature of 350 K is maintained by the condensing steam. The water inlet temperature is 290 K. and the tubes are $\text{5 m}$ long.

(a) What is the water outlet temperature? Evaluate water properties at an assumed average mean temperature, $T_m=300$ K.
(b) Was the assumed value for $T_m$ , reasonable? If not, repeat the calculation using properties evaluated at a more appropriate temperature.
(c) A range of tube lengths from 4 to 7 in is available lo the engineer designing this condenser. Generate a plot to show what coolant mean velocities are possible if the water outlet temperature is w remain at the value found for part (b). All other conditions remain the same.