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1. Entropy generation is also used to establish criteria for the performance of engineering devices. Explain this point.

1. Entropy generation is also used to establish criteria for the performance of engineering devices. Explain this point.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Q6: 1. Entropy generation is also used to establish criteria for the performance of engineering devices. Explain this point. 2. A well-insulated rigid tank contains 4 kg of a saturated liquid-vapor mixture of water at 250 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this process. 3. Refrigerant-134a at 1 MPa and 100 °C is throttled to a pressure of 0.8 MPa. Determine the reversible work and exergy destroyed during this throttling process. Assume the surroundings to be at 30 °C. 4. Explain Figure Q6-4 FIGURE Q6-4 Thermal efficiency of the ideal Diesel cycle as a function of compression and cutoff ratios (k-1.4). 0.6 0.3 0.4 0.3 0.2 0.1 r. -1 (Otto Typical compression ration leset 8 10 12 14 16 18 20 Compression ratio,
Transcribed Image Text:Q6: 1. Entropy generation is also used to establish criteria for the performance of engineering devices. Explain this point. 2. A well-insulated rigid tank contains 4 kg of a saturated liquid-vapor mixture of water at 250 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this process. 3. Refrigerant-134a at 1 MPa and 100 °C is throttled to a pressure of 0.8 MPa. Determine the reversible work and exergy destroyed during this throttling process. Assume the surroundings to be at 30 °C. 4. Explain Figure Q6-4 FIGURE Q6-4 Thermal efficiency of the ideal Diesel cycle as a function of compression and cutoff ratios (k-1.4). 0.6 0.3 0.4 0.3 0.2 0.1 r. -1 (Otto Typical compression ration leset 8 10 12 14 16 18 20 Compression ratio,
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