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A
British thermal unit (Btu) is an English standard
unit of energy. One Btu is the amount of thermal energy
necessary to raise the temperature of one pound of
pure liquid water by one degree Fahrenheit at the
temperature at which water has its greatest density
(39 degrees Fahrenheit). This is equivalent to approximately
1055 joule (or 1055 watt-seconds).
The
Btu is often used as a quantitative specification
for the energy-producing or energy-transferring capability
of heating and cooling systems such as furnaces, ovens,
refrigerators, and air conditioners. The heat output
of equipment is often specified so that it can be
considered when planning the size of climate control
systems in buildings. 3.7 Btus per hour is equivalent
to 1 watt of heat dissipation. |
