Why must the degrade rectangle in Figure \(21.22 a\) have a greater height than the upgrade rectangle?

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Figure 21.22 For a steady device, the entropy change in the environment must be greater than or equal to zero. (a) Reversible process: = entropy change 0. (b) Irreversible process: entropy change >0 (c) Impossible process: W <0 W <0 Qin Lout entropy change <0 Lin Lout Qin Lout W <0 upgrade degrade kT upgrade degrade T 1 upgrade area entropy change zero degrade area: upgrade area degrade area: entropy would decrease