The actual power rating that is developed by a motor before losses occur.

A byproduct of low-temperature carbonization of a solid fuel.

An energy system in which the fuel production equipment is in close proximity, or connected to, the fuel using equipment.

A container that holds rock used as the thermal mass to store solar energy in a solar heating system.

An inverter that operates independent of or is not connected to an electric transmission and distribution network.

Turbines in which the axis of the rotor's rotation is parallel to the wind stream and the ground.

A heat exchanger that transfers heat contained in a liquid heat transfer fluid to another liquid.

A type of power inverter that produce a high quality (nearly sinusoidal) voltage, at minimum current harmonics.

A unit of work done by the force of one dyne acting through a distance of one centimeter.

A value that describes the ability of a material to conduct heat. The number of Btu that flow through 1 square foot of material, in one hour. It is the reciprocal of the R-Value (U-Value = 1/R-Value).

A term used to describe heat energy lost from a water heater tank.

A solar collector that uses reflective surfaces to concentrate sunlight onto a small area, where it is absorbed and converted to heat or, in the case of solar photovoltaic (PV) devices, into electricity. Concentrators can increase the power flux of sunlig ...

The abrupt and large increase in electrical conductivity exhibited by some metals as the temperature approaches absolute zero.

A heat exchanger that transfers the heat contained in a liquid heat transfer fluid to air.

The use of two or more different fuels (e.g. wood and coal) simultaneously in the same combustion chamber of a power plant.

A form of solar concentrating collector that does not track the sun.

The production of hydrogen using a photoelectrochemical cell.

The process by which a power plant, apparatus, or building is approved for operation based on observed or measured operation that meets design specifications.

The nominal voltage for which a conductor or electrical appliance is designed; the reference voltage for identification and not necessarily the precise voltage at which it operates.

The duct(s) of a forced air heating/cooling system through which heated or cooled air is supplied to rooms by the action of the fan of the central heating or cooling unit.