What is a BTU?

What is a BTU?

British Thermal Unit -The amount of energy required to heat one pound of water by 1°F.
In North America, the term “BTU” is used to describe the heat value (energy content) of fuels, and also to describe the power of heating and cooling systems.

·  1 watt is approximately 3.41214BTU/h

·  1000BTU/h is approximately 293.07Watts

 

British thermal unit From Wikipedia, the free encyclopedia

In North America, the term “Btu” is used to describe the heat value (energy content) of fuels, and also to describe the power of heating and cooling systems, such as furnaces, stoves, barbecue grills, and air conditioners. When used as a unit of power, Btu per hour (Btu/h) is the correct unit, though this is often abbreviated to just “Btu”.[verification needed]

The unit MBtu was defined as one thousand Btu, presumably from the Roman numeral system where “M” stands for one thousand (1,000). This is easily confused with the SI mega (M) prefix, which multiplies by a factor of one million (1,000,000). To avoid confusion many companies and engineers use MMBtu to represent one million Btu. Alternatively a therm is used representing 100,000 or 105 Btu, and a quad as 1015 Btu. Some companies also use BtuE6 in order to reduce confusion between a thousand Btu vs. a million Btu.[verification needed]

Definitions

A Btu is defined as amount of heat required to raise the temperature of one 1 pound (0.454 kg) of liquid water by 1 °F (0.556 °C) at a constant pressure of one atmosphere. As is the case with the calorie, several different definitions of the Btu exist, which are based on different water temperatures and therefore vary by up to 0.5%: A Btu can be approximated as the heat produced by burning a single wooden match[2] or as the amount of energy it would take to lift a one-pound weight to a height of 778 feet (237 m).[3]