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Engineering and Tech / Thermodynamics: An Engineering Approach 8 / Chapter 7 / Problem 763

Thermodynamics: An Engineering Approach | 8th Edition | ISBN: 9780073398174 | Authors: Yunus A. Cengel

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A 30-kg aluminum block initially at 1408C is brought into

Chapter 7, Problem 763

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QUESTION:

A 30-kg aluminum block initially at 1408C is brought into contact with a 40-kg block of iron at 608C in an insulated enclosure. Determine the final equilibrium temperature and the total entropy change for this process.

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QUESTION:

A 30-kg aluminum block initially at 1408C is brought into contact with a 40-kg block of iron at 608C in an insulated enclosure. Determine the final equilibrium temperature and the total entropy change for this process.

ANSWER:

Step 1 of 4

An aluminum block is brought into contact with an iron block in an insulated enclosure. The final equilibrium temperature and the total entropy change for this process are to be determined.

Assumptions are

1. Both the aluminum and the iron block are incompressible substances with constant specific heats.

2. The system is stationary and thus the kinetic and potential energies are negligible.

3. The system is well-insulated and thus there is no heat transfer.

The specific heat of aluminum at the anticipated average temperature of is . The specific heat of iron at room temperature (the only value available in the tables) is (Table A-3).

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