Answered: T 42.5°C T 21°C shaft, out = 1.016 kW…

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T 42.5°C T 21°C shaft, out = 1.016 kW elec, in Motor hA(T-T

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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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

Data are provided for steady-state operation of an electric motor in figure below, where hA = 5 W/K.

Determine for the motor the rate of entropy production, in W/K.

T 42.5°C
T 21°C
shaft, out = 1.016 kW
elec, in
Motor
hA(T-T

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