A drag-type wind machine that can react to wind from any direction.

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.

Any light source designed specifically to direct light a task or work performed by a person or machine.

A device that measures the intensity of direct beam solar radiation.

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

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

A column of burning combustion gases that are so hot and strong that the heat is lost up the chimney before it can be transferred to the house. A draft brings air to the fire to help keep it burning.

A type of insulation, composed of small diameter pink, yellow, or white glass fibers, formed into blankets or batts, or used in loose-fill and blown-in applications.

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 ( ...

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 ...

Those elements of building used to control the interior climate.

A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system.

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

The heat absorbed or released when a substance undergoes a change in temperature.

The pressure of the steam or water in a boiler as measured; usually expressed in pounds per square inch gauge (psig).

A type of turbine in which combusted, pressurized gas is directed against a series of blades connected to a shaft, which forces the shaft to turn to produce mechanical energy.

The point or outdoor temperature where the heating capacity of a heat pump matches the heating requirements of a building.

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

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

A charge for the maximum rate at which energy is used during peak hours of a billing period. That part of a utility service charged for on the basis of the possible demand as distinguished from the energy actually consumed.