A shell and tube heat exchanger is made up of a single 27-in shell and 2 tube passes. The tubes are 1½ 14 BWG with a 1 7/8-in in triangular pitch. City water passes through the shell of the heat exchanger. The water enters at 70°C with a mass flow rate of 20 kg/s. Liquid hexane passes through the tubes at a flow rate of 45 kg/s. The hexane enters the heat exchanger at 20°C. The heat exchanger is 5 m long and there are 3 baffles per meter. Determine the

a. Fluid outlet temperatures and the pressure drop (kPa) for each fluid stream for a clean heat exchanger.

b. Fluid outlet temperatures and the pressure drop (kPa) for each fluid stream for a clean heat exchanger if a square tube pitch is used instead of triangular.