Conversion factors for oil. The number of barrels of crude oil per tonne varies widely, depending upon the source. There are differing definitions in the literature of a tonne of oil equivalent (toe). It is derived from the formula for kinetic energy: Ek = ½ mv2, where m is the mass of the object in motion and v is its velocity. [The DOE/EIA and OECD/IEA assumptions are summarized in Table 1.]. By definition: It is to be noted that a 1 GWe plant does not normally generate 1 GWyr of electricity per year. Measured energy is often expressed in SI units as joules per gram (J/g), kilojoules per kilogram (kJ/kg), or joules per kilogram (J/kg), depending on the … Specific energy is defined as energy per unit mass.

. Update Contact Information, Librarians In a fairly widely used specification of a nominal value, the energy content of 1 tonne of coal equivalent is set equal to 7 x 109 calories [e.g., Ref. For the United States in 1995, the average was 20.9 MBtu/ton (3). A joule is the metric, or more accurately, the International System of Units (SI) measurement of energy. Three different q values are plotted on the specific energy diagram above. Join an APS Unit This is often particularly important where fuel gradations are concerned. It can help determine things like combustion times in engines and other large mechanics, and also helps food researchers draw conclusions about nutritive compositions and energy profiles of various meals and food items. Light, another form of energy, has no mass. 1 ton of coal (equiv) = 26.6 GJ = 25.2 MBtu. This average, together with the nominal equivalence of 5.8 MBtu/bbl, corresponds to a heat content for crude oil of 42.5 MBtu/tonne. Get instant definitions for any word that hits you anywhere on the web! Efficiency for fossil fuel and nuclear sources. Donate to APS, Renew Membership Referees Things that are weightless, like light, often require a slightly different calculation and measuring rubric. Thus, in a traditional definition, one calorie is the amount of heat required to raise the temperature of 1 gram of water by 1°C, from 14.5 °C to 15.5 °C. The numerical value of specific energy in Chaldean Numerology is: 8, The numerical value of specific energy in Pythagorean Numerology is: 9. How to say specific energy in sign language? Although one mole of a substance has a definite molar mass, the mole is tecnically an adimensional unit, a pure number. Primary energy and end-use energy. Then, at a level of precision that makes the particular choice of "calorie" irrelevant: 1 tonne of coal (equiv) = 29.3 GJ = 27.8 MBtu. When this is done, the energy corresponding to 1 kWh of electricity depends upon the conversion efficiency, and is typically above 10,000 Btu. A BTU is the energy required to raise the temperature of one pound of water by 1°F. In considering energy consumption for electricity generation, a separation is sometimes made between the electrical energy consumed at the point of use (converted from electricity sales at the rate of 3412 Btu/kWh) and the energy lost to heat in electricity generation and transmission. An earlier attempt by chemists to define energy was the calorie, the energy required to raise the temperature of one gram of water by 1°C. Energy equivalent for non-fossil fuel sources. From the standpoint of energy resources, the interesting number is the primary energy---the total energy consumed at the generating plant, whether used efficiently or wasted.

Concentration by mass is the measurement of a quantity per unit mass, and to this extent specific energy may be thought of as the concentration of energy per unit mass. The ratio of the actual electricity generated to the amount which would be generated were the plant to operate at full capacity for one year is the capacity factor. This is not an exact measurement, however, as the energy required depends slightly on the starting temperature of the water. Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. Measured energy is often expressed in SI units as joules per gram (J/g), kilojoules per kilogram (kJ/kg), or joules per kilogram (J/kg), depending on the system under study. Several definitions of the calorie are now in common use, including (2): The International Table (IT) calorie has been adopted in the publications of the Energy Information Administration of the U.S. Department of Energy (DOE/EIA) (3) and of the International Energy Agency of the Organization for Economic Co-operation and Development (OECD/IEA) (4). The heat content of crude oil from different countries varies from about 5.6 million Btu (MBtu) per barrel to about 6.3 MBtu (5). Editorial Office: 1 Research Road, Ridge, NY 11961-2701 | Phone: 631.591.4000 As for the calorie, there is a family of "Btu's" in relatively common use, including: Again, the IT unit is the one used in DOE/EIA publications. What are the Different Types of Energy Management Software? The concept is also usually important to aerodynamics and the automotive industry, as well as food scientists and researchers. [More precisely, 1 kWh = 3412.14 Btu (IT).]. Thanks for your vote!

The energy equivalent can be considered to be an alternate energy unit, precisely related to units such as the joule, calorie, or Btu. Media Energy equivalents for oil and coal are discussed in succeeding paragraphs, below, and are listed in Table 1. As seen in Table 1, this nominal heat content is considerably higher than the average heat content of coal as presently consumed in the United States; it is, however, fairly close to the average heat content of coal used in the early 1950s (3). Thus, it is usually desirable to consider energy budgets in terms of the energy content of the resource originally consumed, i.e., the primary energy and not the end-use energy.