Exergy vector diagram

Fig. 11.8. Schematic exergy vector diagrams for exergy transfer between an exergy-absorbing process and an exergy-releasing process (a) the combined process is not feasible, (b) the combined process is feasible.

We notice in Fig. 11.9 that no vector of thermal processes can occupy the separating and mixing regimes in the exergy vector diagram. 

Fig. 11.14. Exergy vector diagram for an iron oxide reduction, FeO - Fe + 0.5O2, coupled with a heating process at 2800 K [Ref. 15.].

We examine, as an example, the exergy vector diagram for methanol synthesis to estimate the minimum exergy loss thermodynamically required for the synthesis reaction of methanol from methane [Ref. 16.]. First, we consider a direct (single step) synthesis of methanol from methane through a coupled-and-coupling reaction consisting of the oxidation of methane (objective reaction) and the dissociation of water molecule (coupled reaction) shown, respectively, as follows ... 

Fig. 11.20. Exergy vector diagram of water electrolysis reaction at room temperature.

Any process that occurs in an open system can be represented on an exergy-enthalpy diagram by a vector starting from the origin of the coordinate axes. A non-spontaneous and... 

Fig. 11.6. Reaction vectors in exergy-enthalpy diagrams (a) a non-spontaneous process giving a single reaction vector, (b) coupling and coupled processes leading to a composite reaction vector.

There are three vector regimes in the exergy-enthalpy diagram as described in the following ... 

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