Thermodynamics For Dummies by Mike Pauken

Author:Mike Pauken
Language: eng
Format: epub, pdf
Publisher: Wiley
Published: 2011-06-28T16:00:00+00:00

Irreversibility (I) is a thermodynamic concept that’s quantified by the following statements:

Irreversibility is the difference between the work output or input of a reversible process and an actual work process (Wrev – Wact).

Irreversibility is equivalent to the availability destroyed (Adestroy) in a system during a process.

Irreversibility is proportional to the entropy a system generates (Sgen)during a process.

Because many different processes generate irreversibility, it can be calculated several ways. You can summarize the three basic statements about irreversibility stated in the preceding list like this:

I = Adestroy = T0Sgen = (Wrev – Wact)

For a closed system, the irreversibility is calculated with this equation:

I = T0(ΔSsys – Sin + Sout)

In this equation, the entropy in (Sin) and the entropy out (Sout) terms are due to heat transfer across the system boundaries, such that the irreversibility can be calculated using this equation:

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