Liquid carbon dioxide enters the tubes of a shell and tube heat exchanger at a temperature of 0°C and a flow rate of 30 kg/s. The carbon dioxide is heated with a flow of city water that enters the shell side of the heat exchanger at a temperature of 40°C and a flow rate of 31 kg/s. The heat exchanger is a single shell, two-tube pass configuration with a 25 in shell. The tubes are ¾-in 10 BWG laid out on a 1-in triangular pitch. The heat exchanger is 2 m long and contains 2 baffles per meter of length. Determine

a. The outlet temperatures and pressure drops of each fluid in the heat exchanger for the case of a brand new heat exchanger just put into service

b. The outlet temperatures of each fluid after the heat exchanger has been in continuous service for one year without maintenance

c. If the outlet temperature of the carbon dioxide must be 20°C or higher, is this heat exchanger sufficient for the required duty?