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  • Notes
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  • the entropy change of a closed system during an irreversible process isgreater than the integral of $$\delta Q / T$$ evaluated for that process

$$d S \geq \frac{\delta Q}{T}$$

  • entropy generation $$S_{\mathrm{gen}}$$: is the entropy generated during a process

$$\Delta S_{\mathrm{sys}}=S_{2}-S_{1}=\int_{1}^{2} \frac{\delta Q}{T}+S_{\mathrm{gen}}$$

  • Increase of entropy principle: the entropy of an isolated system duringa process always increases or, in the limiting case of a reversible process, remains constant. In other words, it never decreases

$$S_{\mathrm{gen}}=\Delta S_{\mathrm{total}}=\Delta S_{\mathrm{sys}}+\Delta S_{\mathrm{surr}} \geq 0$$

$$S_{\mathrm{gen}} \left\{\begin{array}{l}{>0 \text { Irreversible process }} \\ {=0 \text { Reversible process }} \\ {<0 \text { Impossible process }}\end{array}\right.$$

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