Consider an adiabatic, reversible compressor that takes in air at 100 kPa, 300 K and compresses it to 2000 kPa. Treat air as an ideal gas with constant specific heat. a. How much work is required per kg of air? b. The compressor is fitted with an intercooler so that the air is first compressed to 1000 kPa, then cooled to 300 K in an intercooler, and finally compressed to 2000 kPa. How much work is required per kg of air?

Consider an adiabatic, reversible compressor that takes in air at 100 kPa, 300 K and compresses it to 2000 kPa. Treat air as an ideal gas with constant specific heat. a. How much work is required per kg of air? b. The compressor is fitted with an intercooler so that the air is first compressed to 1000 kPa, then cooled to 300 K in an intercooler, and finally compressed to 2000 kPa. How much work is required per kg of air?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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,