Q2: Total mark=100 A blanket is made of silk with thickness of 2 mm. The density of the silk is p=1097 kg/m' and its the

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Q2 Total Mark 100 A Blanket Is Made Of Silk With Thickness Of 2 Mm The Density Of The Silk Is P 1097 Kg M And Its The 1 (40.91 KiB) Viewed 42 times

Q2: Total mark=100 A blanket is made of silk with thickness of 2 mm. The density of the silk is p=1097 kg/m' and its thermal conductivity is k=0.083 W/m.K. It has been decided to reduce the weight of the blanket using a multi-layer of 0.1 mm thick silk with 1.5 mm thick air space between layers (k=0.026 W/m.K, p=1.24 kg/m²). Determine a) The number of 0.1 mm thick layers required to have the same rate of heat loss through the blanket, (80 Marks) b) The percentage decrease/increase in the weight and volume of the blanket when the multi- layer thin silk fabric is used. (20 Marks)