3473-11 Lecture Outline 8

3473-11 Lecture Outline 8 - 8 1 of 2 CHE 3473 Fa11 Whiteley...

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8 – 1 of 2 CHE 3473 – Fa11 Whiteley Lecture 8 (9/9/11) Assigned Reading Entropy balance; ideal and lost work; Smith, Van Ness, Abbott 7 th ed. (SVNA7) 3 rd law Ch. 5, pp. 173 - 188 Assignments Handouts (on web unless stated otherwise) HW #3 assigned; due Wed, Sep 14 Outline 1. Inference of entropy as a physical property from the 2 nd law 2. Mathematical statement of the 2 nd law 3. Entropy balance for open systems 4. Ideal and lost work 5. The 3 rd law Key Concepts 1. Unlike energy, entropy is NOT conserved. 2. How nature works: 0 system surroundings total SS S Δ+ Δ = Δ ALWAYS! 3. Entropy balance for an open system calculates the total rate of entropy production for the process. For a completely reversible process, the rate of entropy production is zero. 4. A completely reversible process exhibits the following two characteristics: a. System: process inside the control boundary is reversible b. Surroundings: heat transfer across the control boundary is reversible
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3473-11 Lecture Outline 8 - 8 1 of 2 CHE 3473 Fa11 Whiteley...

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