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

A type of lamp having a lens of heavy durable glass that focuses the light. They have longer lifetimes with less lumen depreciation than standard incandescents.

A heat absorbing reaction or a reaction that requires heat.

A heat exchanger coil in which a fluid such as water is circulated and a fan blows air over the coil to distribute heat or cool air to the different rooms.

To heat a gaseous mixture to the temperature at which combustion takes place.

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

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

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

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

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

The production of an electric current in a conductor by the variation of a magnetic field in its vicinity.

The amount of energy service or useful energy delivered per unit of energy input. Often used in reference to lighting systems, where the visible light output of a luminary is relative to power input; expressed in lumens per Watt; the higher the efficacy v ...

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.

A group of organic compounds composed of carbon, hydrogen, and oxygen; a series of molecules composed of a hydrocarbon plus a hydroxyl group; includes methanol, ethanol, isopropyl alcohol and others.

A compound used to make certain types of solar photovoltaic cells.

A power line for supplying electricity within a specified area.

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 means to increase the thermal efficiency of a steam electric generating system by converting some waste heat from the condenser into electricity. The heat engine in a bottoming cycle would be a condensing turbine similar in principle to a steam turbine ...

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 ...