Calculate the R-value for the following materials:
a. 4 in. thick brick
b. 10 cm thick brick
c. 12 in. thick concrete slab
d. 20 cm thick concrete slab
e. 1 cm thick human fat layer
(a)

Find the
Answer to Problem 9P
The
Explanation of Solution
Given data:
The thickness of the brick,
From table 11.3 in the textbook, the thermal conductivity of the brick,
Formula used:
The formula to find
Here,
Calculation:
Substitute
Therefore,
Conclusion:
Hence, the
(b)

Find the
Answer to Problem 9P
The
Explanation of Solution
Given data:
The thickness of the brick,
Calculation:
Substitute
Therefore,
Conclusion:
Hence, the
(c)

Find the
Answer to Problem 9P
The
Explanation of Solution
Given data:
The thickness of the concrete slab,
From Table 11.3 in the textbook, the thermal conductivity of the concrete slab,
Calculation:
Substitute
Therefore,
Conclusion:
Hence, the
(d)

Find the
Answer to Problem 9P
The
Explanation of Solution
Given data:
The thickness of the concrete slab,
Calculation:
Substitute
Therefore,
Conclusion:
Hence, the
(e)

Find the
Answer to Problem 9P
The
Explanation of Solution
Given data:
The thickness of the human fat layer,
From table 11.3 in the textbook, the thermal conductivity of the human fat layer,
Calculation:
Substitute
Therefore,
Conclusion:
Hence, the
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Chapter 11 Solutions
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