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Unformatted text preview: outside of a 2mlong, 3.2cmouterdiameter vertical tube
maintained at 15°C. Determine (a) the average heat transfer FIGURE P10–77
10–78E Saturated steam at 100°F is condensed on a 6fthigh
vertical plate that is maintained at 80°F. Determine the rate of
heat transfer from the steam to the plate and the rate of condensation per foot width of the plate.
10–79 Saturated refrigerant134a vapor at 35°C is to be condensed on the outer surface of a 7mlong, 1.5cmdiameter
horizontal tube that is maintained at a temperature of 25°C.
Determine the rate at which the refrigerant will condense, in
kg/min.
10–80 Repeat Problem 10–79 for a tube diameter of 3 cm. 10–81 Saturated steam at 270.1 kPa condenses inside a horizontal, 6mlong, 3cminternaldiameter pipe whose surface is
maintained at 110°C. Assuming low vapor velocity, determine cen58933_ch10.qxd 9/4/2002 12:38 PM Page 559 559
CHAPTER 10 the average heat transfer coefficient and the rate of condensation of the steam inside the pipe.
Answers: 3345 W/m2 · °C, 0.0174 kg/s 10–82 A 1.5cmdiameter silver sphere initially at
30°C is suspended in a room filled with saturated steam at 100°C. Using the lumped system analysis, determine how long it will take for the temperature of the ball to
rise to 50°C. Also, determine the amount of steam that condenses during this process and verify that the lumped system
analysis is applicable.
10–83 Repeat Problem 10–82 for a 3cmdiameter copper ball.
10–84 You have probably noticed that water vapor that condenses on a canned drink slides down, clearing the surface for
further condensation. Therefore, condensation in this case can
be considered to be dropwise. Determine the condensation heat
transfer coefficient on a cold canned drink at 5°C that is placed
in a large container filled with saturated steam at 95°C.
Steam
95°C 5°C FIGURE P10–84 behind the refrigerator. Heat transfer from the outer surface of
the coil to the surroundings is by natura...
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This note was uploaded on 01/28/2010 for the course HEAT ENG taught by Professor Ghaz during the Spring '10 term at University of Guelph.
 Spring '10
 Ghaz

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