Water at the rate of 0.8 kg/s at 93 °C is forced through a 5 cm ID copper tube at a suitable velocity. The wall thickness is 0.8 mm. Air at 15 °C and atmospheric pressure is forced over the outside of the tube at a velocity of 15 m/s in a direction normal to the axis of the tube. What is the heat loss per length of tube in W/m?