An electrochemical device that converts chemical energy directly into electricity.

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

The ratio of the electric power produced by a photovoltaic device to the power of the sunlight incident on the device.

An exterior door that protects the primary door.

A small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.

A tubular material used to encase and protect one or more electrical conductors.

The ratio of power produced by a wind energy conversion device to the power in a reference area of the free windstream.

A water heater that releases hot water from the top of the tank when a hot water tap is opened. To replace that hot water, cold water enters the bottom of the tank to ensure a full tank.

The storage of compressed air in a container for use to operate a prime mover for electricity generation.

Glass, plastic panels, or plastic sheets that reduce air infiltration and some heat loss when attached to either the interior or exterior of existing windows.

A device used to maintain a specified humidity in a conditioned space.

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

A measure of the efficacy (efficiency) of lamps. It indicates the amount of light (lumens) emitted by the lamp for each unit of electrical power (Watts) used.

Large, flat boxes with glass covers and dark-colored metal plates inside that absorb and transfer solar energy to a heat transfer fluid.

A heat source, such as a space heater, used to provide more heat than that provided by a primary heating source.

An air conditioning system that has two ducts, one is heated and the other is cooled, so that air of the correct temperature is provided by mixing varying amounts of air from each duct.

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

Methyl Tertiary Butyl Ether (MTBE) is an ether compound used as a gasoline blending component to raise the oxygen content of gasoline. MTBE is made by combining isobutylene (from various refining and chemical processes) and methanol (usually made from nat ...

In refrigeration, an evaporating temperature of 5 degrees Fahrenheit (F), a condensing temperature of 86 degrees F., liquid temperature before expansion of 77 degrees F., and suction temperature of 12 degrees F.

As defined by the Comprehensive National Energy Act of 1992 (or the Energy Policy Act; EPAct): any organic matter from a plant which is planted for the exclusive purpose of being used to produce energy." This does not include wood or agricultural wastes o ...