Consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 W/m °C) with 1.5-mm-thick air space (k = 0.026 W/m °C) between the layers. Assuming the inner surface temperature of the jacket to be 28 °C and the surface area to be 1.1 m², determine the rate of heat loss through the jacket when the temperature of the outdoors is -5°C and the heat transfer coefficient at the outer surface is 25 W/m². °C. What would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric?

Consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 W/m °C) with 1.5-mm-thick air space (k = 0.026 W/m °C) between the layers. Assuming the inner surface temperature of the jacket to be 28 °C and the surface area to be 1.1 m², determine the rate of heat loss through the jacket when the temperature of the outdoors is -5°C and the heat transfer coefficient at the outer surface is 25 W/m². °C. What would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 W/m-°C) with
1.5-mm-thick air space (k = 0.026 W/m °C) between the layers. Assuming the inner surface
temperature of the jacket to be 28 °C and the surface area to be 1.1 m², determine the rate of heat
loss through the jacket when the temperature of the outdoors is -5°C and the heat transfer
coefficient at the outer surface is 25 W/m².°C.
What would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic
fabric?

2. Clothing made of several thin layers of fabric with trapped air in between, often called ski
clothing, is commonly used in cold climates because it is light, fashionable, and a very effective
thermal insulator. So it is no surprise that such clothing has largely replaced thick and heavy old-
fashioned coats.
Multilayered
ski jacket
REBUT

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Step 1: To determine the rate of heat loss.

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Step 2: Calculating the heat loss from the thick fabric layers.

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Step 3: Calculating the heat transfer from single-layered material.

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Step 4: Calculating the thickness of wool for same insulation.

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