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A container has a 4 mm thick metal wall and is lined insider with a 1.5 mm-thick plastic. The inside temperature is 80oC and the outside ambient temperature is 25oC. When ambient air flow is high, heat loss on the outside is a combined convection and radiation and the overall coefficient is 50 W/m^2·K. Thermal resistance inside is negligible. Thermal conductivity of the metal is 60 W/m·K and that of the plastic is 0.08 W/m·K. "Wind chill temperature" is defined as the air temperature under calm conditions with the same heat loss rates.   1)Calculate the heat loss rate. 2) What is the "wind chill" temperature for the above scenario if the outside combined coefficient is 20 W/m K when the wind is calm

A container has a 4 mm thick metal wall and is lined insider with a 1.5 mm-thick plastic. The inside temperature is 80oC and the outside ambient temperature is 25oC. When ambient air flow is high, heat loss on the outside is a combined convection and radiation and the overall coefficient is 50 W/m^2·K. Thermal resistance inside is negligible. Thermal conductivity of the metal is 60 W/m·K and that of the plastic is 0.08 W/m·K. "Wind chill temperature" is defined as the air temperature under calm conditions with the same heat loss rates.   1)Calculate the heat loss rate. 2) What is the "wind chill" temperature for the above scenario if the outside combined coefficient is 20 W/m K when the wind is calm

Elements Of Electromagnetics
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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A container has a 4 mm thick metal wall and is lined insider with a 1.5 mm-thick plastic. The
inside temperature is 80oC and the outside ambient temperature is 25oC. When ambient air
flow is high, heat loss on the outside is a combined convection and radiation and the overall
coefficient is 50 W/m^2·K. Thermal resistance inside is negligible. Thermal conductivity of the
metal is 60 W/m·K and that of the plastic is 0.08 W/m·K. "Wind chill temperature" is defined
as the air temperature under calm conditions with the same heat loss rates.
 
1)Calculate the heat loss rate.
2) What is the "wind chill" temperature for the above scenario if the outside combined
coefficient is 20 W/m K when the wind is calm
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