b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a t

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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 T 1 (24.07 KiB) Viewed 35 times

b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a thickness 10 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) [8 Marks] [3 marks] The temperature at the common surfaces. Thermal conductivity, k values are: Aluminium alloy = 4 W/m °C Plastic layer = 0.5 W/m °C