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British thermal unit |
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British thermal unit, abbr. Btu, unit for measuring heat quantity in the customary system of English units of measurement English units of measurement, principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U.S. ..... Click the link for more information. , equal to the amount of heat required to raise the temperature of one pound of water at its maximum density [which occurs at a temperature of 39.1 degrees Fahrenheit (°F;) ] by 1°F;. The Btu may also be defined for the temperature difference between 59°F; and 60°F;. One Btu is approximately equivalent to the following: 251.9 calories; 778.26 foot-pounds; 1055 joules; 107.5 kilogram-meters; 0.0002928 kilowatt-hours. A pound (0.454 kilogram) of good coal when burned should yield 14,000 to 15,000 Btu; a pound of gasoline or other fuel oil, approximately 19,000 Btu. |
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The MRF uses an energy recovery ventilation system that recycles British thermal units to heat the building, recycling two-thirds to three-quarters of its energy. Its heat output in British Thermal Units (BTUs) however, was considered too low to be effective at the time. 73 quadrillion British thermal units annually, according to the U. |
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