
(Case 1)
Interpretation: The overall heat transfer coefficient based on the inside as well as the outside area of the given condenser tube is to be calculated.
Concept Introduction:
The rate of heat transfer is written as:
Here,
Further the thermal resistance can be written as:
Here,
Overall heat transfer coefficient for the inner surface is calculated as:
Overall heat transfer coefficient for the outer surface is calculated as:
(Case 1)

Answer to Problem 11.1P
Overall heat transfer coefficient for the inner surface is,
Overall heat transfer coefficient for the outer surface is,
Explanation of Solution
Given information:
Temperature of the water flowing inside the tube,
Condenser tube is
Temperature of the saturated steam flowing outside of the tube,
Inside heat transfer coefficient,
Outside heat transfer coefficient,
Thermal conductivity of the tube material,
For a
Calculate the inner and outer area for the unit length of the pipe as:
Now, calculate the thermal resistance for the given tube using equation (2) as:
Use equation (3) to calculate the overall heat transfer coefficient for the inner surface as:
Use equation (4) to calculate the overall heat transfer coefficient for the outer surface as:
(case 2)
Interpretation: The overall heat transfer coefficient based on the inside as well as the outside area of the given steel pipe is to be calculated.
Concept Introduction:
The rate of heat transfer is written as:
Here,
Further the thermal resistance can be written as:
Here,
Overall heat transfer coefficient for the inner surface is calculated as:
Overall heat transfer coefficient for the outer surface is calculated as:
(case 2)

Answer to Problem 11.1P
Overall heat transfer coefficient for the inner surface is,
Overall heat transfer coefficient for the outer surface is,
Explanation of Solution
Given information:
Temperature of the air flowing inside the pipe,
Velocity of air flowing inside the pipe,
Outside diameter of the steel pipe,
Thickness of the pipe wall,
Inside heat transfer coefficient,
Outside heat transfer coefficient,
Thermal conductivity of the pipe material,
For the given steel pipe, its inner and outer radius is taken as:
Calculate the inner and outer area for the unit length of the pipe as:
Now, calculate the thermal resistance for the given tube using equation (2) as:
Use equation (3) to calculate the overall heat transfer coefficient for the inner surface as:
Use equation (4) to calculate the overall heat transfer coefficient for the outer surface as:
(case 3)
Interpretation:The overall heat transfer coefficient based on the inside as well as the outside area of the given schedule 40 steel pipe is to be calculated.
Concept Introduction:
The rate of heat transfer is written as:
Here,
Further, the thermal resistance can be written as:
Here,
Overall heat transfer coefficient for the inner surface is calculated as:
Overall heat transfer coefficient for the outer surface is calculated as:
(case 3)

Answer to Problem 11.1P
Overall heat transfer coefficient for the inner surface is,
Overall heat transfer coefficient for the outer surface is,
Explanation of Solution
Given information:
Gauge pressure of condensation,
1-in. Schedule 40 steel pipe is used.
Temperature of the oil flowing inside the pipe,
Inside heat transfer coefficient,
Outside heat transfer coefficient,
Thermal conductivity of the pipe material,
For the given 1-in. Schedule 40 steel pipe, its inner and outer radius is taken as:
Calculate the inner and outer area for the unit length of the pipe as:
Now, calculate the thermal resistance for the given tube using equation (2) as:
Use equation (3) to calculate the overall heat transfer coefficient for the inner surface as:
Use equation (4) to calculate the overall heat transfer coefficient for the outer surface as:
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Chapter 11 Solutions
Unit Operations of Chemical Engineering
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