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Heat of combustion. The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy ), is the amount of heat released during the combustion of a specified amount of it. The calorific value is the total energy released as heat when a substance undergoes complete combustion with oxygen under standard ...
The tonne of oil equivalent ( toe) is a unit of energy defined as the amount of energy released by burning one tonne of crude oil. It is approximately 42 gigajoules or 11.630 megawatt-hours, although as different crude oils have different calorific values, the exact value is defined by convention; several slightly different definitions exist.
Energy density. In physics, energy density is the amount of energy stored in a given system or region of space per unit volume. Often only the useful or extractable energy is measured. It is sometimes confused with stored energy per unit mass, which is called specific energy or gravimetric energy density .
The energy content of biofuel is the chemical energy contained in a given biofuel, measured per unit mass of that fuel, as specific energy, or per unit of volume of the fuel, as energy density . A biofuel is a fuel produced from recently living organisms. Biofuels include bioethanol, an alcohol made by fermentation —often used as a gasoline ...
Wobbe index. The Wobbe index (WI) or Wobbe number [1] is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities. If is the higher heating value, or higher calorific value, and is the specific ...
Liquefied petroleum gas. Liquefied petroleum gas, also referred to as liquid petroleum gas ( LPG or LP gas ), is a fuel gas which contains a flammable mixture of hydrocarbon gases, specifically propane, n -butane and isobutane. It can sometimes contain some propylene, butylene, and isobutene. [ 1][ 2][ 3]
Solid fuel. A fire made of charcoal briquettes. Solid fuel refers to various forms of solid material that can be burnt to release energy, providing heat and light through the process of combustion. Solid fuels can be contrasted with liquid fuels and gaseous fuels. Common examples of solid fuels include wood, charcoal, peat, coal, hexamine fuel ...
Power plant efficiency. The efficiency of a plant is the percentage of the total energy content of a power plant 's fuel that is converted into electricity. The remaining energy is usually lost to the environment as heat unless it is used for district heating . Rating efficiency is complicated by the fact that there are two different ways to ...