The gaseous byproducts of the combustion of a fuel.

The sum of sensible heat and latent heat in a substance above a base temperature, typically 32 degrees Fahrenheit.

Water heated for residential washing, bathing, etc.

The physical material upon which a photovoltaic cell is applied.

A hydrocarbon gas, C3H8, occurring in crude oil, natural gas, and refinery cracking gas. It is used as a fuel, a solvent, and a refrigerant. Propane liquefies under pressure and is the major component of liquefied petroleum (LPG).

A system where heat is supplied to areas of a building from a single appliance through a network of ducts or pipes.

Major energy consuming sectors of the economy. The Commercial Sector includes commercial buildings and private companies. The Industrial Sector includes manufacturers and processors. The Residential Sector includes private homes. The Transportation Sector ...

The flow of electrical energy (electricity) in a conductor, measured in amperes.

A popular term for highly insulating window with a heat loss so low it performs better than an insulated wall in winter, since the sunlight that it admits is greater than its heat loss over a 24 hour period.

The amount of energy an energy storage device or system can store.

A self-contained toilet that use the process of aerobic decomposition (composting) to break down feces into humus and odorless gases.

The process of changing the structure of the electric power industry from one of guaranteed monopoly over service territories, as established by the Public Utility Holding Company Act of 1935, to one of open competition between power suppliers for custome ...

The component of a central air conditioner that is designed to remove heat absorbed by the refrigerant and transfer it outside the conditioned space.

Electric power plant or utility capacity on line and running at low power in excess of actual load.

A device used to regulate motor speed, or, in a wind energy conversion system, to control the rotational speed of the rotor.

A type of furnace in which fuel is spread, automatically or mechanically, across the furnace grate.

The demand on an energy producing system; the energy consumption or requirement of a piece or group of equipment.

Methyl Tertiary Butyl Ether (MTBE) is an ether compound used as a gasoline blending component to raise the oxygen content of gasoline. MTBE is made by combining isobutylene (from various refining and chemical processes) and methanol (usually made from nat ...

A water heater that releases hot water from the top of the tank when a hot water tap is opened. To replace that hot water, cold water enters the bottom of the tank to ensure a full tank.

The temperature that a system is designed to maintain (inside) or operate against (outside) under the most extreme conditions.