Question

Problem 5. An iron pipe carrying hot air at 50 $^\circ$C is surrounded by cool air at 0 $^\circ$C. How much can the heat loss from the pipe be reduced if the outside surface of the pipe is covered with a layer of insulation? Give your answer in % reduction. Neglect heat radiation and contact resistance between the pipe and the insulation. Include sketches of the given system and of the equivalent thermal circuit(s). Material properties: $k_{iron} = 80 \frac{W}{m\cdot K}$ $k_{insulation} = 0.1 \frac{W}{m\cdot K}$ 1000 mm = 100 cm = 1 m hot air: $h_i = 20 \frac{W}{m^2 \cdot K}$ cool air: $h_o = 80 \frac{W}{m^2 \cdot K}$ Iron pipe: inside diameter = 4 cm; pipe wall thickness = 6 mm; insulation thickness = 10 mm

          Problem 5.
An iron pipe carrying hot air at 50 $^\circ$C is surrounded by cool air at 0 $^\circ$C. How much can the heat loss
from the pipe be reduced if the outside surface of the pipe is covered with a layer of insulation? Give
your answer in % reduction. Neglect heat radiation and contact resistance between the pipe and the
insulation. Include sketches of the given system and of the equivalent thermal circuit(s).
Material properties: $k_{iron} = 80 \frac{W}{m\cdot K}$ 
$k_{insulation} = 0.1 \frac{W}{m\cdot K}$
1000 mm = 100 cm = 1 m
hot air: $h_i = 20 \frac{W}{m^2 \cdot K}$
cool air: $h_o = 80 \frac{W}{m^2 \cdot K}$
Iron pipe: inside diameter = 4 cm; pipe wall thickness = 6 mm; insulation thickness = 10 mm

Problem 5.
An iron pipe carrying hot air at 50 ^∘C is surrounded by cool air at 0 ^∘C. How much can the heat loss
from the pipe be reduced if the outside surface of the pipe is covered with a layer of insulation? Give
your answer in % reduction. Neglect heat radiation and contact resistance between the pipe and the
insulation. Include sketches of the given system and of the equivalent thermal circuit(s).
Material properties: kiron = 80 (W)/(m· K)
kinsulation = 0.1 (W)/(m· K)
1000 mm = 100 cm = 1 m
hot air: hi = 20 (W)/(m^2 · K)
cool air: ho = 80 (W)/(m^2 · K)
Iron pipe: inside diameter = 4 cm; pipe wall thickness = 6 mm; insulation thickness = 10 mm

Added by Kimberly T.

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