Tutorial 6 - BMCT 2713 THERMODYNAMICS I TUTORIAL 06...

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BMCT 2713 THERMODYNAMICS I TUTORIAL 06 FACULTY OF MECHANICAL ENGINEERING BMCT 2713THERMODYNAMICS I TUTORIAL 06 1. The entropy of a hot baked potato decreases as it cools. Is this a violation of the increase of entropy principle? Explain. 2. Is it possible to create entropy? Is it possible to destroy it? 3. Is it possible for the entropy change of a closed system to be zero during an irreversible process? Explain. 4. Air is compressed by a 12 kW compressor from P 1 to P 2 . The air temperature is maintained constant at 25 o C during this process as a result of heat transfer to the surrounding medium at 10 o C. Determine the rate of entropy change of the air. State the assumption made in solving this problem. 5. During the isothermal heat addition process of a Carnot cycle, 900 kJ of heat is added to the working fluid from a source at 400 o C. Determine: a) The entropy change of the working fluid b) The entropy change of the source c) The total entropy change for the process.
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Christopher Reinemann
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