Concept explainers
(a)
The rate of heat transfer and the mass rates of water and hydrocarbon streams.
(a)
Explanation of Solution
Given:
The specific heat of hydrocarbon stream
The number of tube
The diameter of tube
The length of tube
The heat transfer coefficient of the tube side
The heat transfer coefficient of the shell side
The inlet temperature of hydrocarbon stream is
The outlet temperature of hydrocarbon stream is
The inlet temperature of water stream is
The outlet temperature of water stream is
Calculation:
Calculate the temperature differences between the hydrocarbon stream and water stream at inlet
Calculate the temperature differences between the hydrocarbon stream and water stream at outlet
Calculate the logarithmic mean temperature
Calculate the overall heat transfer coefficient of the heat exchanger
Calculate the rate of heat transfer
Calculate the mass flow rate of cold fluid stream
Calculate the mass flow rate of hot fluid stream
Thus, The rate of heat transfer and the mass rates of water is
(b)
The magnitude of fouling factor
(b)
Explanation of Solution
Given:
The specific heat of hydrocarbon stream
The number of tube
The diameter of tube
The length of tube
The heat transfer coefficient of the tube side
The heat transfer coefficient of the shell side
The inlet temperature of hydrocarbon stream is
The outlet temperature of hydrocarbon stream is
The inlet temperature of water stream is
Calculation:
Calculate the rate of heat transfer
Calculate the outlet temperature of hot fluid is
Calculate the temperature differences between the hydrocarbon stream and water stream at inlet
Calculate the temperature differences between the hydrocarbon stream and water stream at outlet
Calculate the logarithmic mean temperature
Calculate the ratio P and R using the relation.
Refer Figure 22-19 “Correction factor F charts for common shell-and-tube and cross-flow heat exchangers”.
Obtain the correction factor
Thus, The magnitude of fouling factor is
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Chapter 22 Solutions
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