Concept explainers
The thickness of the insulation.
The money saved by the insulation during the time period.
Explanation of Solution
Given:
The temperature
The length
The diameter
The ambient air temperature
The pipe temperature
The effective sky temperature
The time period
The emissivity
The thermal conductivity
Calculation:
Refer table
Obtain the following properties of air corresponding to the temperature of
Calculate the volume expansion coefficient
Calculate the heat loss
Calculate the heat loss
Calculate the total amount of heat loss using the relation.
Calculate the reduction in heat loss due to insulation.
Calculate the energy
Calculate the money saved using the relation.
Calculate the characteristics length
Calculate the Rayleigh number
Calculate the Nusselt number
Calculate the heat transfer coefficient
Calculate the area
Calculate the heat loss
Calculate the heat loss
Solve all the above Equations to obtain the values.
Thus, thickness of the insulation in pipe is
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Chapter 20 Solutions
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