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A net energy gain is achieved by expending less energy acquiring a source of energy than is contained in the source to be consumed. That is =. Factors to consider when calculating NEG is the type of energy, the way energy is used and acquired, and the methods used to store or transport the energy.
The ratio of the energy released by burning the resulting ethanol fuel to the energy used in the process, is known as the ethanol fuel energy balance (sometimes called "Net energy gain") and studied as part of the wider field of energy economics.
For example, given a process with an EROI of 5, expending 1 unit of energy yields a net energy gain of 4 units. The break-even point happens with an EROI of 1 or a net energy gain of 0. The time to reach this break-even point is called energy payback period (EPP) or energy payback time (EPBT). [27] [28]
U.S. Energy Secretary Jennifer Granholm confirmed that scientists achieved a reaction that created more energy than was used — known as a net energy gain — at the federally-funded Lawrence ...
Scientists with the Department of Energy were recently able to achieve a net energy gain from a nuclear fusion reaction for the second time, the department said Monday. Paul Rhien, a spokesperson ...
A fusion energy gain factor, usually expressed with the symbol Q, is the ratio of fusion power produced in a nuclear fusion reactor to the power required to maintain the plasma in steady state. The condition of Q = 1, when the power being released by the fusion reactions is equal to the required heating power, is referred to as breakeven , or ...
NIF achieved net energy gain [261] in 2013, as defined in the very limited sense as the hot spot at the core of the collapsed target, rather than the whole target. [262] In 2014, Phoenix Nuclear Labs sold a high-yield neutron generator that could sustain 5×10 11 deuterium fusion reactions per second over a 24-hour period. [263]
Sankey diagram of the laser energy to hohlraum x-ray to target capsule energy coupling efficiency. Note the "laser energy" is after conversion to UV, which loses about 50% of the original IR power. The conversion of x-ray heat to energy in the fuel loses another 90% – of the 1.9 MJ of laser light, only about 10 kJ ends up in the fuel itself.