1- The rear window of an automobile is defogged by passing warm air over its inner surface with (k = 1.4 W/m- K.). If the warm air is at (T∞,i=40 °C) and the corresponding convection coefficient is (hi=30 W/m² .K), what are the inner and outer surface temperatures of (4 mm) thick window glass, if the outside ambient air temperature is (T∞,0=-10 °C) and the associated convection coefficient is (ho=65 W/m².K)?

1- The rear window of an automobile is defogged by passing warm air over its inner surface with (k = 1.4 W/m- K.). If the warm air is at (T∞,i=40 °C) and the corresponding convection coefficient is (hi=30 W/m² .K), what are the inner and outer surface temperatures of (4 mm) thick window glass, if the outside ambient air temperature is (T∞,0=-10 °C) and the associated convection coefficient is (ho=65 W/m².K)?

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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Heat Transfer
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Home Work
1- The rear window of an automobile is defogged by passing warm air over its inner surface
with (k = 1.4 W/m- K.). If the warm air is at (T∞,i=40 °C) and the corresponding convection
coefficient is (hi=30 W/m² .K), what are the inner and outer surface temperatures of (4
mm) thick window glass, if the outside ambient air temperature is (T∞,0=-10 °C) and the
associated convection coefficient is (ho=65 W/m².K)?
2- The walls of a refrigerator are typically constructed by sandwiching a layer of insulation
between sheet metal panels. Consider a wall made from fiberglass insulation of thermal
conductivity (ki= 0.046 W/m.K) and thickness (Li= 50 mm) and steel panels, each of
thermal conductivity (kp= 64 W Q1 .K)_and thick
mm). If the wall separates
refrigerated air at (Too,i=4 °C) from ambient air at
C), what is the heat gain per
X
heat transfer Lec. 3 2021.pdf
X
ㅁㅎ I
(S)

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