British Thermal Unit, BTU

British thermal unit (Btu) The most commonly used industrial heal unit the amount of heat required to raise 1 lb of water through UF under specified conditions. Since the specific heat of water varies, particularly with temperature, the actual value of Btu is dependent on the conditions chosen as stan-... 

Heat is measured in term.s of the calorie, defined as the amount of heat necessary to raise the temperature of 1 gram of water at a pressure of 1 atmosphere firom 15 to 16 °C. This unit is sometimes called the small calorie, or gram calorie, to distinguish it from the large calorie, or kilocalorie, equal to 1000 small calories, which is used in nutritional studies. In mechanical engineering practice in the United States and the United Kingdom, heat is measured in British thermal units (Btu). One Btu is the quantity of heat required to raise the temperature of 1 pound of water 1 ° F and is equal to 252 calories. 

British thermal unit (Btu, International Table) joule (J) 1.0550559 X 10 ... 

The economic value of natural gas is primarily determined by the thermal energy it contains, which is expressed in British thermal units (Btu) or calorific value (CV). Other important physical properties comprise the liquid content, the burning characteristics, the dew point and the compressibility. In order to enable the calculation of these properties from its composition, a natural gas analysis should contain a detailed determination of all of the individual components, even in the low-concentration range. 

The amount of heat input, measured in British thermal units (Btu s), needed to generate a kilowatt hour of electricity with steam turbines decreased by almost 40 percent between 1925 and 1945, and by 35 percent during the period 1945 to 1965. During this period, scale became an important factor in power... 

The definitions above are an abbreviated version of those used in a veiy complex and financially significant exercise with the ultimate goal of estimating resei ves and generating production forecasts in the petroleum industry. Deterministic estimates are derived largely from pore volume calculations to determine volumes of either oil nr gas in-place (OIP, GIP). This volume when multiplied by a recovery factor gives a recoverable quantity of oil or natural gas liquids—commonly oil in standard barrels or natural gas in standard cubic feet at surface conditions. Many prefer to use barrels of oil equivalency (BOE) or total hydrocarbons tor the sum of natural gas, natural gas liquids (NGL), and oil. For comparison purposes 6,000 cubic feet of gas is considered to be equivalent to one standard barrel on a British thermal unit (Btu) basis (42 U.S. gallons). 

British thermal unit Btu is the energy needed to raise the temperature of 1 lb of water 1°F (0.6°C) at sea level. As an example, one lb of solid waste usually contains 4500 to 5000 Btu. Plastic waste contains greater Btu than other materials of waste. 

Thermal energy or heat calorie joule British thermal unit (Btu) M 9 H... 

In the British systems of units, the pound, but never the slug, is taken as the unit of mass and temperature may be expressed either in degrees Centigrade or in degrees Fahrenheit. The units of heat are then, respectively, the pound-calorie and the British thermal unit (Btu). Where the Btu is too small for a given application, the therm (— 105 Btu) is normally used. 

Energy British Thermal Unit (BTU) kilogram-calorie (kcal)... 

Heat Energy kilojoule kJ 0.9478 British thermal unit BTU ... 

Inputs were provided to the cost model for an Alaskan site with an area of 10,000 fU and a soil density of 100 Ib/ft. The specific heat of the soil was 0.20 British thermal units (Btu) per pound per degree Fahrenheit. The HeatTrode centerline distance was 5 ft, and each HeatTrode was installed to a depth of 10 ft (D17162K, p. 12). 

Contaminated feed materials must have a minimum solids content of 60% to facilitate materials handling operations. The vendor advises that the unit has a waste heat value upper limit of approximately 300 British thermal unit (Btu) per pound (Btu/lb). Waste blending or homogenization is recommended as a means to evenly distribute both moisture and Btu content. 

High thermal efficiency with low emissions Cost-effective, low power consumption Produces a medium British thermal unit (Btu), reformate gas Stable operation... 

The heat of combustion can be determined from the °API gravity. Low °API fuels have higher BTU ratings per gallon than high °API gravity fuels. See APPENDIX 1 for °API vs. British Thermal Unit (BTU) nomograph. 

British Thermal Unit (BTU) A measure of the quantity of heat required to raise the temperature of 1 lb of water 1°F. For fuels such as gasoline, kerosene, fuel oil, and residual fuels, the following formulas can be used to determine the BTU/lb ... 

Dr. Mayer already knew the weight of wax needed to heat 1 lb of water by 1°F. His British colleagues had previously determined this quantity, and had called it a British thermal unit (Btu). 

The example just given illustrates how. on a macroscopic scale, heat can he considered a form of energy. Regardless of the material involved, any amount of heat absorbed or released may be quantitatively expressed as an amount of energy. A grum-calorie or heal is equivalent to 4.19 joules, and in the English system, a British thermal unit (Btu) is equivalent to 778 foot-pounds. 

BRITISH THERMAL UNIT (Btu). A unit of heat. The heat required to warm 1 pound of pure water through an interval of 1 degree Fahrenheit. 

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