Evaluating Entropy (The Tds relations)

That is "Tedious", but without the vowels, of course! Recall from consideration of the Clausius Inequality that we defined entropy as follows:

Tables of 2-phase fluid (Steam, R134a)

Notice that all the properties on the right hand side of this equation T, P, v, u are measurable properties given in the tables, thus this differential equation can be solved numerically, leading to the table values of entropy s.

Liquid (or solid - incompressible)

Ideal Gas

Entropy Equation Summary Sheet

Back to the Clausius Inequality

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Engineering Thermodynamics by Israel Urieli is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License