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The energy input might be rendered in several different types depending on the type of propulsion, and normally such energy is presented in liquid fuels, electrical energy or food energy. [ 9 ] [ 10 ] The energy efficiency is also occasionally known as energy intensity . [ 11 ]
However, this does not imply that improved fuel efficiency is worthless if the Jevons paradox occurs; higher fuel efficiency enables greater production and a higher material quality of life. [19] For example, a more efficient steam engine allowed the cheaper transport of goods and people that contributed to the Industrial Revolution .
In fact, International Energy Agency has calculated that the application of energy efficiency measures in the years 1974-2010 has succeeded in avoiding more energy consumption in its member states than is the consumption of any particular fuel, including fossil fuels (i.e. oil, coal and natural gas).
Fossil fuel phase-out is the gradual reduction of the use and production of fossil fuels to zero, to reduce air pollution, limit climate change, and strengthen energy independence. It is part of the ongoing renewable energy transition , but is being hindered by fossil fuel subsidies .
Low speed diesel engines like the MAN S80ME-C7 have achieved an overall energy conversion efficiency of 54.4%, which is the highest conversion of fuel into power by any single-cycle internal or external combustion engine. [9] [10] [11] Engines in large diesel trucks, buses, and newer diesel cars can achieve peak efficiencies around 45%. [12]
A simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%. [5] Typical coal-based power plants operating at steam pressures of 170 bar and 570 °C run at efficiency of 35 to 38%, [6] with state-of-the-art fossil fuel plants at 46% efficiency. [7] Combined-cycle systems can reach higher values.
According to the Global Carbon Project, carbon emissions from fossil fuels hit a record high in 2024 as U.S. crude oil production hit a new record in August 2024, according to the U.S. Energy ...
The U.S. Department of Energy's Fuel Cell Technology Program states that, as of 2011, fuel cells achieved 53–59% efficiency at one-quarter power and 42–53% vehicle efficiency at full power, [106] and a durability of over 120,000 km (75,000 miles) with less than 10% degradation. [107]