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2300_les16

# 2300_les16 - VI Entropy A Introduction 1 The first law...

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1 Lesson 16, Geof Silcox, Chemical Engineering, University of Utah VI. Entropy A. Introduction 1. The first law: energy cannot be created or destroyed 2. The second law: certain processes do occur and certain processes don’t 3. The magic vortex tube. Will it work or won’t it ? Magic Vortex Tube Compressed air 2 kg at 4 atm, 300 K Hot air 1 kg at 1 atm, 333 K Cold air 1 kg at 1 atm 273 K We need a quantitative answer. This suggests that we are looking for a property (like T, P, u, or V). How can we find such a property? Lesson 16, Geof Silcox, Chemical Engineering, University of Utah VI. Entropy B. The Clausius Inequality Rev. Heat Engine T H T L Q L Q H W out,net For a reversible heat engine, (6-16), is H L rev H L Q Q Q or 0 T T T δ = = v For an irreversible heat engine, with Q H constant, H L irrev L,irrev L,rev H L Q Q Q Q Q or or 0 T T T δ > < < v In general, we have the Clausius inequality, Q 0 T δ v (7-1) H L H L T T Q Q = and

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