
Concept explainers
(a)
The rate of heat transfer through the wall made of solid bricks.
(a)

Explanation of Solution
Given:
Thickness of the wall is 10 in.
Height of the wall is 10 ft.
Length of the wall is 30 ft.
Thermal conductivity of the solid bricks is
Cross section of the solid brick is
Thermal conductivity of the bricks with air holes is
Cross section of the brick used with air holes is
Length of the bricks is 9 in.
Thickness of plaster is 0.5 in.
Thermal conductivity of the plaster is
Indoor temperature is
Outdoor temperature is
The inside heat transfer coefficient is
The outside heat transfer coefficient is
Calculation:
The total thermal resistance of the arrangement is,
The rate of heat transfer through the wall per
The total rate of heat transfer through the entire wall is,
Thus, the rate of heat transfer through the wall made of solid bricks is
(b)
The rate of heat transfer through the wall made of bricks with air holes.
(b)

Explanation of Solution
Calculation:
The total thermal resistance of the arrangement is,
The rate of heat transfer through the wall per
The total rate of heat transfer through the entire wall is,
Thus, the rate of heat transfer through the wall made of bricks with air holes is
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Chapter 17 Solutions
Fundamentals of Thermal-Fluid Sciences
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