Air is compressed from 120 kPa and 350 K to 1200 kPa and 750 K.a) Calculate the change in specific entropy As of the air using constant specific heat capacitiesat 550 K and equations based on cp, Cv, and the heat capacity ratio k.b) Calculate the change in specific entropy As of the air using equations and table values(A-17), which account for the changes in heat capacities with temperature.c) What will the temperature at the end of the compression process T2, be, if the pressure aftercompression is 1200 kPa, the compression process is isentropic, and you use constant specificheat capacities at 550 K and equations based on Cp, Cv, and the heat capacity ratio k.d) What will the temperature at the end of the compression process T2, be, if the pressure aftercompression is 1200 kPa, the compression process is isentropic, and you account for changesin heat capacities with temperature by using corresponding equations and table values?e) Calculate the deviation between the results for As and T₂ in %

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Answered: Air is compressed from 120 kPa and 350…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Problem 8 Calculate the change in the entropies of the system (AS.99) and the surroundings (ASsur), and the total entropy change (ASotal) when a sample of 1.0 mol of an ideal gas at 300 K and 1.0 bar triples its volume in: a) isothermal reversible expansion b) isothermal expansion against a vacuum (Psurr = 0) c) Will the process in (a) occur spontaneously? What about the process in (b)? Why or why not? %3D
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