Heat Transfer – A Practical Approach-Solution Manual 2nd. Edition by Yunus A. Çengel | 9780071151504 | 0071151508 | Holooly

Heat Transfer – A Practical Approach-Solution Manual [EXP-6588]

358 SOLVED PROBLEMS

Question: 1.121

2.5 kg of liquid water initially at 18°C is to be heated to 96°C in a teapot equipped with a 1200-W electric heating element inside. The teapot is 0.8 kg and has an average specific heat of 0.6 kJ/kg · °C. Taking the specific heat of water to be 4.18 kJ/kg · °C and disregarding any heat loss from

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Cold water is to be heated in a 1200-W teapot. The...

Question: 3.38.E

A 0.03-in-thick copper plate (k = 223 Btu/h · ft · °F) is sandwiched between two 0.1-in.-thick epoxy boards (k = 0.15 Btu/h · ft · °F) that are 7 in. × 9 in. in size. Determine the effective thermal conductivity of the board along its 9-in.-long side. What fraction of the heat conducted along that

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A thin copper plate is sandwiched between two laye...

Question: 1.132

A 0.2-L glass of water at 20°C is to be cooled with ice to 5°C. Determine how much ice needs to be added to the water, in grams, if the ice is at 0°C. Also, determine how much water would be needed if the cooling is to be done with cold water at 0°C. The melting temperature and the heat of fusion

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A 0.2-L glass of water at 20°C is to be cooled wit...

Question: 1.92

A 0.3-cm-thick, 12-cm-high, and 18-cm-long circuit board houses 80 closely spaced logic chips on one side, each dissipating 0.06 W. The board is impregnated with copper fillings and has an effective thermal conductivity of 16 W/m · °C. All the heat generated in the chips is conducted across the

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A circuit board houses 80 closely spaced logic chi...

Question: 1.28

A 1-m^3 rigid tank contains hydrogen at 250 kPa and 420 K. The gas is now cooled until its temperature drops to 300 K. Determine (a) the final pressure in the tank and (b) the amount of heat transfer from the tank.

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The hydrogen gas in a rigid tank is cooled until i...

Question: 3.48

A 1-mm-thick copper plate (k = 386 W/m · °C) is sandwiched between two 5-mm-thick epoxy boards (k = 0.26 W/m · °C) that are 15 cm × 20 cm in size. If the thermal contact conductance on both sides of the copper plate is estimated to be 6000 W/m · °C, determine the error involved in the total thermal

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A thin copper plate is sandwiched between two epox...

Question: 1.102

A 1.4-m-long, 0.2-cm-diameter electrical wire extends across a room that is maintained at 20°C. Heat is generated in the wire as a result of resistance heating, and the surface temperature of the wire is measured to be 240°C in steady operation. Also, the voltage drop and electric current through

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The convection heat transfer coefficient for heat ...

Question: 1.32.E

A 10- ft ^3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the surroundings. Neglecting the energy stored in the paddle wheel, determine the work done by the

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A paddle wheel in an oxygen tank is rotated until ...

Question: 3.54

A 10-cm-thick wall is to be constructed with 2.5-m long wood studs (k = 0.11 W/m · °C) that have a cross section of 10 cm × 10 cm. At some point the builder ran out of those studs and started using pairs of 2.5-m-long wood studs that have a cross section of 5 cm × 10 cm nailed to each other instead

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A wall is to be constructed of 10-cm thick wood st...

Question: 3.56.E

A 10-in.-thick, 30-ft-long, and 10-ft-high wall is to be constructed using 9-in.-long solid bricks (k = 0.40 Btu/h · ft · °F) of cross section 7 in. × 7 in., or identical size bricks with nine square air holes (k = 0.015 Btu/h · ft · °F) that are 9 in. long and have a cross section of 1.5 in. × 1.5

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A wall is to be constructed using solid bricks or ...

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