Water (c= 4180 j/kg. °c) is to be heated by solar heated hot air (cp = 1010 j/kg•°c) in a double-pipe counterflow heat exchanger. air enters the heat exchanger at 90°c at a rate of 0.3 kg/s, while water enters at 22°c at a rate of 0.1 kg/s. the overall heat transfer coefficient based on the inner side of the tube is given to be 80 w/m.°c. the length of the tube is 12 m and the internal diameter of the tube is 1.2 cm. determine the outlet temperatures of the water and the air.( 27.3°c, 82.7°c)