7-107 A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the surroundings temper- ature of 27°C. Assume constant specific heats at 300 K. (a) Determine the entropy change of the air in the tank dur- ing the process, in kJ/K, (b) determine the net entropy change of the universe due to this process, in kJ/K, and (c) sketch the processes for the air in the tank and the surroundings on a single T-s diagram. Be sure to label the initial and final states for both processes.

7-107 A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the surroundings temper- ature of 27°C. Assume constant specific heats at 300 K. (a) Determine the entropy change of the air in the tank dur- ing the process, in kJ/K, (b) determine the net entropy change of the universe due to this process, in kJ/K, and (c) sketch the processes for the air in the tank and the surroundings on a single T-s diagram. Be sure to label the initial and final states for both processes.

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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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

7-107 A constant-volume tank contains 5 kg of air at 100
kPa and 327°C. The air is cooled to the surroundings temper-
ature of 27°C. Assume constant specific heats at 300 K.
(a) Determine the entropy change of the air in the tank dur-
ing the process, in kJ/K, (b) determine the net entropy change
of the universe due to this process, in kJ/K, and (c) sketch the
processes for the air in the tank and the surroundings on a
single T-s diagram. Be sure to label the initial and final states
for both processes.

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