b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a thickness 20 mm, the middle layer having convection heat transfer coefficient, h of 10 W/m2°C and an inner layer of plastic of a thickness 40 mm. If the temperature outside the aeroplane is -60 degrees centigrade at a high altitude and the inside of the fuselage is to be maintained at +20 degrees centigrade, find: i) The heat loss per unit area (Note: Area = 1 m²) ii) The temperature at the common surfaces. Thermal conductivity, k values are: Aluminium alloy = 4 W/m °C Plastic layer = 0.5 W/m °C
b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a thickness 20 mm, the middle layer having convection heat transfer coefficient, h of 10 W/m2°C and an inner layer of plastic of a thickness 40 mm. If the temperature outside the aeroplane is -60 degrees centigrade at a high altitude and the inside of the fuselage is to be maintained at +20 degrees centigrade, find: i) The heat loss per unit area (Note: Area = 1 m²) ii) The temperature at the common surfaces. Thermal conductivity, k values are: Aluminium alloy = 4 W/m °C Plastic layer = 0.5 W/m °C
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Chapter2: Steady Heat Conduction
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![b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a
thickness 20 mm, the middle layer having convection heat transfer coefficient, h of 10 W/m2°C and an inner layer of
plastic of a thickness 40 mm. If the temperature outside the aeroplane is -60 degrees centigrade at a high altitude and
the inside of the fuselage is to be maintained at +20 degrees centigrade, find:
i)
The heat loss per unit area (Note: Area = 1 m²)
ii)
The temperature at the common surfaces.
Thermal conductivity, k values are:
Aluminium alloy
= 4 W/m °C
Plastic layer
= 0.5 W/m °C](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd8d9580c-4d0b-49bc-ba37-39696277403c%2Fb998eb39-7d9a-46ed-a2db-e38e0db875e7%2F1690ffk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a
thickness 20 mm, the middle layer having convection heat transfer coefficient, h of 10 W/m2°C and an inner layer of
plastic of a thickness 40 mm. If the temperature outside the aeroplane is -60 degrees centigrade at a high altitude and
the inside of the fuselage is to be maintained at +20 degrees centigrade, find:
i)
The heat loss per unit area (Note: Area = 1 m²)
ii)
The temperature at the common surfaces.
Thermal conductivity, k values are:
Aluminium alloy
= 4 W/m °C
Plastic layer
= 0.5 W/m °C
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