A water heater that heats water before it is directly distributed for end use as required; a demand water heater.

The process in which a solid fuel is converted into a gas; also known as pyrolitic distillation or pyrolysis. Production of a clean fuel gas makes a wide variety of power options available.

A refined petroleum product suitable for use as a fuel in internal combustion engines.

A device that tracks the movement of the sun; used to orient solar concentrating systems.

The quantity of heat produced to change a unit weight of a liquid to vapor with no change in temperature.

A furnace/combustion chamber in which finely ground fuel is blown in spirals in the combustion chamber to maximize combustion efficiency.

A device for converting mechanical energy to electrical energy.

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 ...

A class of power generator that is not a regulated utility and that has generating plants for the purpose of supplying electric power required in the conduct of their industrial and commercial operations.

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.

A mechanical/electrical device used to pull air out of an interior space; usually located in the highest location of a building, in the ceiling, and venting to the attic or directly to the outside.

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

A heating system, such as a solar water heater or geothermal heatpump, in which the working fluid is heated and used directly; in an open-loop solar system, the domestic water is circulated in the collector loop.

A device for converting continuous circular motion into reciprocating rectilinear motion.

The process of managing the consumption of energy, generally to optimize available and planned generation resources.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

A form of thermal energy resulting from combustion, chemical reaction, friction, or movement of electricity. As a thermodynamic condition, heat, at a constant pressure, is equal to internal or intrinsic energy plus pressure times volume.

Features and vegetation on the outside of or surrounding a building for aesthetics and energy conservation.

The concept of capturing and converting the energy available in the motion of ocean waves to energy.

The trapping of light inside a semiconductor material by refracting and reflecting the light at critical angles; trapped light will travel further in the material, greatly increasing the probability of absorption and hence of producing charge carriers.