Exergy annihilation

One of two ways in which exergy analysis assists is by pinpointing and quantifying both the annihilations ("consumptions") of exergy, used to drive processes, and the effluent losses of exergy. These are the true inefficiencies, and therefore they point the way to improvement of a system, and they stimulate creativity, leading to entirely new concepts—new technology. 

Exergy, which anything has when it is not in complete equilibrium with our environment, does represent the capacity to cause change for us it can be transferred from one thing to any other, completely in the ideal limit. In actuality, to accomplish changes for us some exergy is invariably annihilated, irreversibly used up because it is needed to make the changes occur. 

Exergy Balances. Writing a steady-state balance for exergy is just like writing a steady-state energy balance except for one major difference. While energy is conserved, exergy can be annihilated (not lost, but actually consumed), and so the balance must contain a destruction term ... 

The denominator exceeds the numerator by the amount of exergy consumed (annihilated) by the transformation plus the amount lost in effluents. 

The Exergy Flowing along the Shaft is said to be Annihilated the Carnot Efficiency is Zero... 

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