exergy

4 9.9

The largest useful amount of energy a system can give when it reaches the same condition as its surroundings

noun
/ˈɛksərdʒi/

Specialized

: exergía

The concept of exergy helps us understand how efficiently a system can convert energy into work.
exergy analysis

Again, another setup is the exergy kind of discussion.

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Examples

Electricity has the highest exergy, and low-grade waste heat the lowest.

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To travel one meter will need 908 Joules - this is the exergy per meter.

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The supplied energy is zero, but the real energy use is the exergy use.

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As technology improves, we can get higher exergy from the same fuels.

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I think what would be a more accurate measure is the exergy intensity of GDP.

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Then they are a net exergy producer (turning near zero exergy solar radiation into high exergy electricity).

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Diesel has an exergy of 30-50%, depending on the efficiency of the engine; gasoline 15-25%.

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Diesel has an exergy of 30-50%, depending on the efficiency of the engine; gasoline has 15-25%.

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In sustainability studies, analyzing the exergy of different energy sources is crucial for improving efficiency.
A higher exergy value indicates that a system can provide more useful energy compared to its environmental interactions.

Surface Forms

exergy singular

exergies plural

Morphology

exergy = energy (semi-transparent) = ex + energy

Formally built from the familiar word 'energy' with the prefix 'ex-'; however, the precise thermodynamic sense ('maximum useful work') is technical and not fully inferable by an average learner.

Etymology

Exergy combines the prefix ex- ('out of') with energy, so it literally means the part of energy you can 'take out' and use. That's why exergy refers to the most useful work you can get from a system as it comes into balance with its surroundings.