Problem • Engine I Referring to the schematic energy flow diagram of a typical automobile engine as shown in Figure. (A) What is the heat lost to the cold reservoir? (B) Calculate the entropy changes in the hot reservoir, the cold reservoir, and the engine, respectively. (C) What is the thermal efficiency of the engine? (D) Compute the Reversible (Carnot) efficiency and the Second-Law Efficiency Hot reservoir 460K (187 C) Heat 1200J Engine system Useful work 320) Cold reservoir 325K (52"C)

Problem • Engine I Referring to the schematic energy flow diagram of a typical automobile engine as shown in Figure. (A) What is the heat lost to the cold reservoir? (B) Calculate the entropy changes in the hot reservoir, the cold reservoir, and the engine, respectively. (C) What is the thermal efficiency of the engine? (D) Compute the Reversible (Carnot) efficiency and the Second-Law Efficiency Hot reservoir 460K (187 C) Heat 1200J Engine system Useful work 320) Cold reservoir 325K (52"C)

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.

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Problem
• Engine I Referring to the schematic energy flow diagram of a typical automobile
engine as shown in Figure. (A) What is the heat lost to the cold reservoir? (B)
Calculate the entropy changes in the hot reservoir, the cold reservoir, and the
engine, respectively. (C) What is the thermal efficiency of the engine? (D)
Compute the Reversible (Carnot) efficiency and the Second-Law Efficiency
Hot reservoir
460K (187C)
Heat 1200 J
Useful work
320I
Engine
system
Cold reservoir
325K (52°C)

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