A finned-tube, cross-flow heat exchanger is to use the exhaust 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 8 m2 , to determine the overall heat transfer coefficient as a function of operating conditions. Measurements made under particular conditions, for which m 1.5 kg/s h = , Th, i = 325°C, m 0.5 kg/s c = , and Tc, i = 25°C, reveal a water outlet temperature of Tc, o = 125°C. What is the overall heat transfer coefficient of the exchanger?
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