Homework 8(1)

# Homework 8(1) - EML 3007 Homework 8 Due Tuesday:59 pm...

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EML 3007 Homework 8 Due Tuesday, April 28, 11:59 pm Important Reading Chapter 16 : sections 16-1, 16-2, 16-3, 16-4 Problems from the Textbook: Chapter 16 : 16-28E, 16-45, 16-53 Problem 16-28E : The north wall of an electrically heated home is 20 ft long, 10 ft high, and 1 ft thick, and is made of brick whose thermal conductivity is k = 0.42 Btu/h-ft-°F. On a certain winter night, the temperatures of the inner and the outer surfaces of the wall are measured to be about 62 °F and 25 °F, respectively, for a period of 8 h. Determine (a) the rate of heat loss through the wall that night and (b) the cost of that heat loss to the home owner if the cost of electricity is \$0.07/kWh. Problem 16-45 : A transistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit board. the transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 W/m 2 -K. If the air temperature is 55 °C and the transistor case temperature is not to exceed 70 °C, determine the amount of power this transistor can dissipate safely.

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