Question

Liquid carbon dioxide at a flow rate of 100 000 kg/hr is to be heated from 0°C to 20°C in a 1-2 shell and tube heat exchanger. Water is available at a flow rate of 113 000 kg/hr and a temperature of 40°C. A 25-in. (635 mm)-ID 1-2 shell and tube exchanger having 3/4-in., 10 BWG tubes laid out on a 1-in. triangular pitch is available. The tubes are 2 m long and the exchanger contains three baffles. Determine expected outlet temperatures and pressure drops when the exchanger is new. Route the carbon dioxide through the tubes and take the CO2 properties to be

At 0°C:    Cp = 2 470 J/(kg·K)      Sp. Gr. = 0.926

                 k_f = 0.104 5 W/(m·K)        ν = 1.08 x 10-7 m²/s

At 10°C:   Cp = 3 140 J/(kg·K)       Sp. Gr. = 0.860

                 k_f = 0.097 1 W/(m·K)         ν = 1.01 x 10-7 m²/s

Answer 1