In the shell of a shell-and-tube heat exchanger with two shell passes and eight tube passes, 12.6 kg/s of water is heated from 80°C to 150°C. Hot exhaust gases having roughly the same physical properties as air enter the tubes at 340°C and leave at 180°C. The total surface area, based on the outer tube surface, is 930 m². Determine 

(a) The log mean temperature difference if the heat exchanger is the simple counter flow type

(b) The correction factor F for the actual arrangement

(c) The effectiveness of the heat exchanger

(d) The average overall heat transfer coefficient