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Energy Balance and Energy Ratio

Energy balance and energy payback ratio.

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The terms "energy balance" and "energy payback ratio", or "energy ratio", are used to describe system energy output related to system energy input.

The energy balance can be expressed as

Eo = dE + Ei                    (1)

or

dE = Eo - Ei                     (1b)

where

dE = energy balance

Eo = energy output

Ei = energy input

The energy ratio - system energy output to system energy input - can be expressed as

ER = Eo / Ei                      (2)

where

ER = energy ratio

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