Water flows through a horizontal coil heated from the outside by high temperature flue gases. As it passes through the coil, the water changes state from liquid at 200kpa and 80℃ to vapor at 100 kpa and 125℃. Its entering velocity is 3 m/s and exit velocity is 200 m/s. Determine the heat transferred through the coil per unit mass. Enthalpies inlet and outlet streams are: 334. 9 kj/kg; outlet at 2726. 5 kj/kg.