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 the relationship between energy output of a system and the energy inputs needed to operate it.
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 can be expressed as:
ER = Eo / Ei (2)
where
ER = energy ratio
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