. The wall of a cold room consists of a layer of cork sandwiched between the outer and inner walls of wood, the wood walls being each 30 mm thick. The inside atmosphere of the room is maintained at -20°C when the external atmospheric temperature is 25°C, and the heat loss through the wall is 42 W/m². Taking the thermal conductivity of wood and cork as 0.20 W/m-K and 0.05 W/m-K respectively, and the rate of heat transfer between each exposed wood surface and their respective atmospheres as 15 W/m²-K. Calculate the thickness of the cork in mm.
. The wall of a cold room consists of a layer of cork sandwiched between the outer and inner walls of wood, the wood walls being each 30 mm thick. The inside atmosphere of the room is maintained at -20°C when the external atmospheric temperature is 25°C, and the heat loss through the wall is 42 W/m². Taking the thermal conductivity of wood and cork as 0.20 W/m-K and 0.05 W/m-K respectively, and the rate of heat transfer between each exposed wood surface and their respective atmospheres as 15 W/m²-K. Calculate the thickness of the cork in mm.
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
Related questions
Question
![1.
2.
The wall of a cold room consists of a layer of cork sandwiched between the
outer and inner walls of wood, the wood walls being each 30 mm thick. The
inside atmosphere of the room is maintained at -20°C when the external
atmospheric temperature is 25°C, and the heat loss through the wall is 42
W/m². Taking the thermal conductivity of wood and cork as 0.20 W/m-K
and 0.05 W/m-K respectively, and the rate of heat transfer between each
exposed wood surface and their respective atmospheres as 15 W/m²-K.
Calculate the thickness of the cork in mm.
Calculate the conductive heat transport through the layered wall in kW of a
furnace wall of 1 ft² consist of 0.5 in. thick stainless steel inner layer covered
with 2 in. outside insulation layer of insulation board. The inside surface
temperature of the steel is 800 K and the outside surface temperature of the
insulation board is 350 K. The thermal conductivity of the stainless steel is
11 BTU/hr - ft.-°F and the thermal conductivity of the insulation board is 0.4
BTU/hr - ft.-°F.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5f7f1617-0f71-4340-a08d-83f0c9fae809%2Fcc25e777-e7d5-4641-acb7-3de44a995342%2Fy507559_processed.png&w=3840&q=75)
Transcribed Image Text:1.
2.
The wall of a cold room consists of a layer of cork sandwiched between the
outer and inner walls of wood, the wood walls being each 30 mm thick. The
inside atmosphere of the room is maintained at -20°C when the external
atmospheric temperature is 25°C, and the heat loss through the wall is 42
W/m². Taking the thermal conductivity of wood and cork as 0.20 W/m-K
and 0.05 W/m-K respectively, and the rate of heat transfer between each
exposed wood surface and their respective atmospheres as 15 W/m²-K.
Calculate the thickness of the cork in mm.
Calculate the conductive heat transport through the layered wall in kW of a
furnace wall of 1 ft² consist of 0.5 in. thick stainless steel inner layer covered
with 2 in. outside insulation layer of insulation board. The inside surface
temperature of the steel is 800 K and the outside surface temperature of the
insulation board is 350 K. The thermal conductivity of the stainless steel is
11 BTU/hr - ft.-°F and the thermal conductivity of the insulation board is 0.4
BTU/hr - ft.-°F.
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