
The amount of heat lost from the steam and the amount of money this facility will save a year as a result of insulating the steam pipes.

Explanation of Solution
Given:
The diameter of the section
The length of the section
The temperature of wind
The temperature of surface
The emissivity
The time of heat transfer
The average temperature of the surfaces
The efficiency of steam generator
The Unit cost of energy is
The velocity of air is
Calculation:
Calculate the film temperature
Refer Table A-22 “Properties of air at 1 atm pressure”.
Obtain the following properties of air corresponding to the temperature of
Calculate the Reynolds number
Calculate the Nusselt number
Calculate the heat transfer coefficient
Calculate the heat loss by convection
Calculate the heat loss by radiation
Calculate the total heat loss
Calculate the amount of heat loss from the steam during a 10-hour work day using the relation.
Calculate the total amount of heat
Calculate the amount of gas
Calculate the money saved
Thus, The amount of heat lost from the steam is
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Chapter 19 Solutions
Fundamentals of Thermal-Fluid Sciences
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