Energy Balance and Energy Ratio

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The terms "energy balance" and "energy payback ratio", or "energy ratio", are used to describe the relationship between energy output of a system and the energy inputs needed to operate it.

The energy balance can be expressed as:

E_o = dE + E_i         (1)

or

dE = E_o - E_i          (1b)

where

dE = energy balance

E_o = energy output

E_i = energy input

The energy ratio can be expressed as:

ER = E_o / E_i         (2)

where

ER = energy ratio

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