(a)
The thickness of the insulation needed to reduce the heat loss by 95 percent.
(a)

Explanation of Solution
Given:
Thermal conductivity of the steel pipe
Heat transfer coefficient inside the pipe
Heat transfer coefficient outside the pipe
Inner diameter of the pipe
Outer diameter of the pipe
Calculation:
Determine the inner surface area of the pipe.
Determine the outer surface area of the pipe.
Determine the surface area of the insulation.
Determine the individual thermal resistances.
Determine the steady rate of heat loss from the steam per meter pipe length in case of no insulation.
Determine the diameter of insulated material.
Determine the thickness of insulation.
Thus, the thickness of insulation is
(b)
The thickness of the insulation needed to reduce the exposed surface temperature of insulated pipe to
(b)

Explanation of Solution
Determine the diameter of insulated material.
Determine the thickness of the insulation.
Thus, the thickness of insulation is
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Chapter 17 Solutions
Fundamentals Of Thermal-fluid Sciences In Si Units
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