A device used by energy auditors to pressurize a building to locate places of air leakage and energy loss.

A building energy auditing technique used to determine and/or locate air leaks in a building shell or envelope.

The measure of seasonal or annual efficiency of a heat pump operating in the heating mode. It takes into account the variations in temperature that can occur within a season and is the average number of Btu of heat delivered for every watt-hour of electri ...

As defined in the Energy Security Act (P.L. 96-294; 1980) as "any organic matter, including sewage, sewage sludge, and industrial or commercial waste, and mixtures of such matter and inorganic refuse from any publicly or privately operated municipal waste ...

Turbines in which the rotor speed increases and decreases with changing wind speed, producing electricity with a variable frequency.

The unit of magnetic field intensity equal to 1 dyne per unit pole.

A power line for supplying electricity within a specified area.

Under the First Law of Thermodynamics, efficiency is the ratio of work or energy output to work or energy input, and cannot exceed 100 percent. Efficiency under the Second Law of Thermodynamics is determined by the ratio of the theoretical minimum energy ...

A WECS that is used to grind grain, and that typically has a high-solidity rotor; commonly used to refer to all types of WECS.

Draft that is caused by temperature differences in the air.

The rate of heat production by a steady current in any part of an electrical circuit that is proportional to the resistance and to the square of the current, or, the internal energy of an ideal gas depends only on its temperature.

Generation of energy at the location where all or most of it will be used.

A turbine that uses water pressure to rotate its blades; the primary types are the Pelton wheel, for high heads (pressure); the Francis turbine, for low to medium heads; and the Kaplan for a wide range of heads. Primarily used to power an electric generat ...

A material that can be used to store thermal energy as latent heat. Various types of materials have been and are being investigated such as inorganic salts, eutectic compounds, and parrafins, for a variety of applications, including solar energy storage ( ...

Gasoline fuel additives such as ethanol, ETBE, or MTBE that add extra oxygen to gasoline to reduce carbon monoxide pollution produced by vehicles.

The first law states that energy can not be created or destroyed; the second law states that when a free exchange of heat occurs between two materials, the heat always moves from the warmer to the cooler material.

An air conditioner consisting of one or more assemblies that move, clean, cool, and dehumidify air.

A profile of how the wind speed changes with height above the surface of the ground or water.

A material used to seal gaps around windows and exterior doors.

The approximate energy producing capacity of a power plant, under specified conditions, usually during periods of highest load.