
Concept explainers
(a)
The rate of heat transfer in the heat exchanger before any fouling occurs.
(a)

Explanation of Solution
Given:
The temperature of glycerin inlet
The temperature of glycerin out
The temperature of hot water inlet
The temperature of hot water out
The diameter of tube is
The length of tube is
The convection heat transfer coefficient of on the glycerin
The convection heat transfer coefficient of on the water
Calculation:
Calculate the temperature differences between the glycerin and water at inlet
Calculate the temperature differences between the glycerin and water at outlet
Calculate the logarithmic mean temperature
Calculate the ratio P and R using the relation.
Refer Figure 22-2 “Correction factor F charts for common shell-and-tube and cross-flow heat exchangers”.
Obtain the correction factor
Calculate the actual overall heat transfer coefficient
Calculate the heat transfer
Thus, the rate of heat transfer in the heat exchanger before any fouling occurs is
(b)
The rate of heat transfer in the heat exchanger after fouling.
(b)

Explanation of Solution
Given:
The temperature of glycerin inlet
The temperature of glycerin out
The temperature of hot water inlet
The temperature of hot water out
The diameter of tube is
The length of tube is
The convection heat transfer coefficient of on the glycerin
The convection heat transfer coefficient of on the water
The fouling factor
Calculation:
Calculate the thermal resistance of the heat exchanger with a fouling factor
Calculate the heat transfer
Thus, the rate of heat transfer in the heat exchanger after fouling occurs is
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Chapter 22 Solutions
Fundamentals of Thermal-Fluid Sciences
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