Water flows through a tube of 1 cm internal diameter and length 18 m with a velocity of 0.14 m/s. The outside surface of the tube is heated electrically so that it is subjected to uniform heat flux circumferentially and axially. The mean inlet and exit temperatures of the water are 15°C and 85°C, respectively. The temperature of the inner surface of the tube at the inlet of water is 50°C. Disregard the thermal resistance of the tube wall. The magnitude of heat transferred by the tube to the water will be___ kW. (round off to one decimal place). (The kinematic viscosity and thermal conductivity of water are 10-6 m2/s and 0.6 W/m.K, respectively)