A shell and tube type heat exchanger consists of 135 thin walled tubes in a double pass arrangement, each of 12.5 mm diameter with total heat transfer area 47.5 m 2 . The water (the tube side fluid)...

A shell and tube type heat exchanger consists of 135 thin walled tubes in a double pass arrangement, each of 12.5 mm diameter with total heat transfer area 47.5 m². The water (the tube side fluid) enters the heat exchanger at 15°C and 6.5 kg/s and is heated by exhaust gas entering at 200°C and 5 kg/s. The gas may be assumed to have the properties of atmospheric air, the overall heat transfer coefficient is approximated as 200 W/ m².K. What are gas and water outlet temperatures ?