Fuels that cannot be easily made or "renewed," such as oil, natural gas, and coal.

A device that transfers heat by the continuous evaporation and condensation of an internal fluid.

A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related.

A power source/generator that operates independently of or is not connected to an electric transmission and distribution network; used to meet a load(s) physically close to the generator.

The angle at which a solar collector or module is set to face the sun relative to a horizontal position. The tilt angle can be set or adjusted to maximize seasonal or annual energy collection.

A unit of electricity consumption of one Watt over the period of one hour.

A device used to transfer heat from a fluid (liquid or gas) to another fluid where the two fluids are physically separated.

The average power output of a wind energy conversion system at a given mean wind speed based on a Raleigh frequency distribution.

The process of changing from one physical state (solid, liquid, or gas) to another, with a necessary or coincidental input or release of energy.

A popular term used to describe the increase in average global temperatures due to the greenhouse effect.

The fine liquid or solid particles contained in combustion gases. The quantity and size of particulates emitted by cars, power and industrial plants, wood stoves, etc are regulated by the U.S. Environmental Protection Agency.

The loss of heat as the water circulates through a water heater tank and inlet and outlet pipes.

A device for measuring power consumption.

A machine for converting mechanical energy into electrical energy by magneto-electric induction; may be used as a motor.

SMES technology uses the superconducting characteristics of low-temperature materials to produce intense magnetic fields to store energy. SMES has been proposed as a storage option to support large-scale use of photovoltaics and wind as a means to smooth ...

The amount of kinetic energy gained by an electron when accelerated through an electric potential difference of 1 Volt; equivalent to 1.603 x 10

As a component of a heating or cooling appliance, rows of tubing or pipe with fins attached through which a heat transfer fluid is circulated and to deliver heat or cooling energy to a building.

A term applied to warm-air heating systems that deliver heated air to rooms by means of registers or baseboards located along exterior walls.

Air that is taken from the outdoors.

Energy available from the movement of the wind across a landscape caused by the heating of the atmosphere, earth, and oceans by the sun.