A heat absorbing reaction or a reaction that requires heat.

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

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

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

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.

Houses that have earth berms around exterior walls.

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

Draft that is caused by temperature differences in the air.

A term used for a wind energy conversion device that produces electricity; typically having one, two, or three blades.

The cutting of a grid pattern of grooves in a semiconductor material, generally for the purpose of making interconnections.

A type of wind turbine in which the axis of rotation is perpendicular to the wind stream and the ground.

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.

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 thin sheet of material (metal) of a heat exchanger that conducts heat to a fluid.

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

A device for converting a solid fuel to a gaseous fuel.

The process of transmitting electricity over one or more separately owned electric transmission and distribution systems. (See Wholesale and Retail Wheeling.)

Waste material from households and businesses in a community that is not regulated as hazardous.

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.

The visible portion of the electromagnetic spectrum with wavelengths from 0.4 to 0.76 microns