Chapter 11, Problem 11.9P

A tinned-tube, cross-how heat exchanger is to use theexhaust of a gas turbine to heat pressurized water. Laboratory measurements are performed on a prototype version of the exchanger, which has a surface area of ${\text{10 m}}^2$ , to determine the overall heat transfer coefficient as afunction of operating conditions. Measurements madeunder particular conditions, tor which ${\stackrel{\dot{}}{m}}_h=2\text{ kg/s}$ , $T_{h,i}=325°C$ , ${\stackrel{\dot{}}{m}}_c=0.\text{5 kg/s}$ , and $T_{c,i}=25°C$ , reveal a water outlet temperature of $T_{c,o}=150°C$ . What is theoverall heat transfer coefficient of the exchanger?