Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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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 m…
Question

Case 1:  1 kg of water initially at 20 C is heated to 100 C by contact with a heat reservoir at 100 C.

Assume Cp  for water is constant at 4.2 kJ/ kg *K.

  1. What is the entropy change of the water?
  2. What is the entropy change of the reservoir?
  3. What is ΔSTotal ?

Case 2: Now, as an alternative, 1 kg of water at 20 C is first heated to 60 C by contact with a heat reservoir at 60 C, and then this water is heated from  60 C to 100 C by contact with a heat reservoir at 100 C.

  1. What is the entropy change of the water?
  2. What is the entropy change of the reservoir?
  3. What is ΔSTotal ?
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