2.19 Consider a 300 mm x 300 mm window in an aircraft. For a temperature difference of 80°C from the inner to the outer surface of the window, calculate the heat loss through L= 10-mm-thick polycarbonate, soda lime glass, and aerogel windows, respectively. The thermal conductivities of the aerogel and polycarbonate are kag = 0.014 W/m-K and ke=0.21 W/m-K, respectively. Evaluate the thermal conductivity of the soda lime glass at 300 K. If the aircraft has 130 windows and the cost to heat the cabin air is $1/kW-h, compare the costs associ- ated with the heat loss through the windows for an 8-hour intercontinental flight.

2.19 Consider a 300 mm x 300 mm window in an aircraft. For a temperature difference of 80°C from the inner to the outer surface of the window, calculate the heat loss through L= 10-mm-thick polycarbonate, soda lime glass, and aerogel windows, respectively. The thermal conductivities of the aerogel and polycarbonate are kag = 0.014 W/m-K and ke=0.21 W/m-K, respectively. Evaluate the thermal conductivity of the soda lime glass at 300 K. If the aircraft has 130 windows and the cost to heat the cabin air is $1/kW-h, compare the costs associ- ated with the heat loss through the windows for an 8-hour intercontinental flight.

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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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

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2.19 Consider a 300 mm x 300 mm window in an aircraft. For
a temperature difference of 80°C from the inner to the
outer surface of the window, calculate the heat loss
through L = 10-mm-thick polycarbonate, soda lime
glass, and aerogel windows, respectively. The thermal
conductivities of the aerogel and polycarbonate are
kag = 0.014 W/m-K and kpe = 0.21 W/m-K, respectively.
Evaluate the thermal conductivity of the soda lime glass
at 300 K. If the aircraft has 130 windows and the cost to
heat the cabin air is $1/kW-h, compare the costs associ-
ated with the heat loss through the windows for an 8-hour
intercontinental flight.

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