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 10 m^2, to determine the overall heat transfer coefficient as a function of operating conditions. Measurements made under particular conditions, for which m_h = 2 kg/s, Th_h, i = 325 degree C, m_c = 0.5 kg/s, and T_c, i = 25 degree C, reveal a water outlet temperature of T_c, o = 150 degree C. What is the overall heat transfer coefficient of the exchanger?