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
m^{2}/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
m^{2}/s

Answer #1

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Data for carbon dioxide:
Molecular weight:44.0
Heat capacity of gas phase: 0.036+4.23
x10-5T (in kJ/moleoC, T is
in oC)
Viscosity Pr k
(W/m K)
180oC2.13 x10-5kg/(m
s) 0.721 0.029
130oC 1.93x10-5kg/(m
s) 0.738 0.025
80oC 1.72x10-5kg/(m
s) 0.755 0.020
Approximate density: 2.0 kg/m3
Data for water:
Molecular weight:18.0
Heat capacity for liquid water: 0.0754 kJ/mole
oC
Viscosity:
Viscosity Pr k
(W/m K)
180oC139 x10-6kg/(m
s) 0.94 0.665
130oC 278x10-6kg/(m
s) 1.72 0.682
80oC 472x10-6kg/(m
s) 3.00 0.658
Ideal gas constant:
0.08206 L atm/(mol K)
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from 180 oC to 80...

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