Question

Water at a flow rate of 60 kg/s enters the shell-side
of a baffled shell-and-tube heat exchanger at 35 °C and leaves at
25 °C. The heat will be transferred to 150 kg/s of raw water coming
from a supply at 15 °C. You are requested to design the heat
exchanger for this purpose. A single shell and single tube pass is
preferable. The tube diameter is ¾ in. (19 mm outer diameter with
16 mm inner diameter) and tubes are laid out on 1 in. square pitch.
The water velocity in a single tube is 2.5 m/s. Maximum length of
the heat exchanger 5 m is required because of space limitations.
The tube material has k=70 W/m·K. Assume a total fouling resistance
of 0.000176 m2·K/W. Baffle spacing is 650 mm. Reasonable design
assumption can be made along with the calculation if it is needed.
Calculate: The number of tubes, shell diameter, overall heat
transfer coefficient and the length of the heat exchanger. Is this
design acceptable?

please help me.course name is heat exchangers.

Answer #1

A shell and-tube heat exchanger is required for the following
service:
Hot stream
Cold Stream
Aromatic Stream
Cooling Water
inlet Temperature (oC)
85
20
outlet Temperature (oC)
40
35
Mass Flowrate x heat Capacity (kW/oC)
85.2
Hot Stream
cold stream (Cooling water)
Heat Capacity (J/kg K)
2840
4193
Density (kg/m3)
750
999
Viscosity (cP)
0.34
1.016
Thermal conductivity (W/m.K)
0.19
0.594
Fouling Factor (m2.oC/W
0.00018
0.000176
? The cooling water is allocated to the tube-side of the
exchanger.
? It...

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Molecular weight:44.0
Heat capacity of gas phase: 0.036+4.23
x10-5T (in kJ/moleoC, T is
in oC)
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(W/m K)
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s) 0.721 0.029
130oC 1.93x10-5kg/(m
s) 0.738 0.025
80oC 1.72x10-5kg/(m
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80oC 472x10-6kg/(m
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