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

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.

An engine in which fuel is burned (or heat is applied) to the outside of a cylinder; a Stirling engine.

An electrochemical device that converts chemical energy directly into electricity.

A solar photovoltaic product that generally consists of groups of PV cells electrically connected together to produce a specified power output under standard test conditions, mounted on a substrate, sealed with an encapsulant, and covered with a protectiv ...

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

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.

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

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

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

An exterior door that protects the primary door.

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.

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

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

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.

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

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.

The average time a minority carrier exists before recombination.

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

A type of hydroelectric facility that uses the river flow with very little alteration and little or no impoundment of the water.