Question

A large steam pipe is covered with 1.5-cm-thick insulating material of thermal conductivity 0.27 J/(s m °C). How much energy is lost every second when the steam is at 205 °C and the outside of the pipe has a temperature of 20°C? The pipe has a circumference of 7.5 m and a length of 80 m. Neglect losses through the ends of the pipe. What is the units as well?

Answer #1

A steam pipe is covered with 1.50 cm thick insulating material
with a thermal conductivity of 0.200 cal/cm·°C·s. How much energy
is lost every second when the steam is at 250°C and the surrounding
air is at 20.0°C? The pipe has a circumference of 800 cm and a
length of 65.0 m. Neglect losses through the ends of the pipe.

A 2 cm thick steel pipe (thermal conductivity = 43 W/[m.C]) with
6 cm inside diameter is being used to convey steam from a boiler to
process equipment for a distance of 40 m. The inside pipe surface
temperature is 115 degrees C, and the outside pipe surface
temperature is 90 degrees C. Calculate the total heat loss to the
surroundings under steady-state conditions.

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