Energy British thermal unit

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

The energy available in the steam is expressed in British thermal units per pound, or enthalpy. The velocity of the steam flow through the nozde is calculated from... 

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. 

Air conditioning systems have been traditionally compared and rated by cooling and/or heating capacity and, more recently, energy efficiency. Capacity is expressed in British thermal units per hour (Bttili) or in watts. Energy efficiency is expressed as the operat-... 

NOTE IxlQ " British thermal units = One quadrillion Btus SOURCE Department of Energy, Annual Energy Beview 1997. 

The BTU (British thermal unit) is foe unit of energy most commonly used in foe United States. One joule = 9.48 x 10-4 BTU. What is foe specific heat of water in BTU/lb °F (Specific heat of water is 4,18 J/g - °Q)... 

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. 

Btu (British thermal unit) is the energy required to raise the temperature of 1 lb of water by 1 °F. 

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

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

The energy value of air conditioners is expressed in terms of BTU (British Thermal Unit). 1 BTU equals the amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit at its maximum density, which occurs at a temperature of 39.1 degree Fahrenheit. 1 BTU is equal to approximately 251.9 calories or 1055 joules. 

The specific heat of water is important because it is so high in relation to the specific heat of other materials this fact means that it takes more energy to raise the temperature of water than just about any other material. Therefore, the temperature of the materials to which water has been applied will drop faster than the temperature of water will rise. The specific heat may be reported as die number of calories needed to raise the temperature of one gram of the material 1°C, or the number of British Thermal Units (BTUs) needed to raise one pound of the material, 1°F. Therefore, when water is applied to a fire, it begins absorbing heat from die fire, thereby cooling the fire down while the water heats up. For every BTU absorbed, the temperature of the water will rise 1°F per... 

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. 

QUAD. An energy unit that has come into use in recent years in predicting future energy requirements on a national basis. One quad equals 1015 Btus (British thermal units), which is the energy equivalent of 1012 cuft natural gas, or 182 million barrels of oil, or 42 million tons of coal, or 293 billion kilowatt-hours of electricity. 

Another common set of units used by chemical engineers is the calorie (or British thermal unit) for energy. The units of calorie [1 cal = 4.1868 J where J is the symbol for joule (rhymes with pool) which is a newton-meter with base units of m2. kg. s-2] and British thermal unit (1 Btu = 1.055 056 x 103 J) are not acceptable with SI units. 

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