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

A type of heat pump that uses sealed horizontal or vertical pipes, buried in the ground, as heat exchangers through which a fluid is circulated to transfer heat.

A heat absorbing reaction or a reaction that requires heat.

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

A holding pond for livestock manure that is designed to anaerobically stabilize manure, and may be designed to capture biogas, with the use of an impermeable, floating cover.

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

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.

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

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

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

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 ...

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.

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

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

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

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

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 group of wind turbines interconnected to a common utility system through a system of transformers, distribution lines, and (usually) one substation. Operation, control, and maintenance functions are often centralized through a network of computerized mo ...

The unit of illuminance equivalent to 1lumen per square meter.