2 A co-current (same direction) heat exchanger has one line with 5 kg/s of n-butane at 120°C and 5 bar entering. The other line is cooling water entering at 20°C and 1 bar. The heat exchanger is long...

Extracted text: 2 A co-current (same direction) heat exchanger has one line with 5 kg/s of n-butane at 120°C and 5 bar entering. The other line is cooling water entering at 20°C and 1 bar. The heat exchanger is long enough so that the two flows exit at the same temperature of 80°C. Calculate: The flow rate of cooling water needed, in kg/s. b. The process efficiency of the heat exchanger. а.