An exterior door that protects the primary door.

An electrochemical device that converts chemical energy directly into electricity.

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 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.

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

A type of photovoltaic device in which the electricity induced in the cell is used immediately within the cell to produce a chemical, such as hydrogen, which can then be withdrawn for use.

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

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.

The average time a minority carrier exists before recombination.

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

The height above the ground that a horizontal axis wind turbine's hub is located.

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

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

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

An empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically it is the luminous flux emitted with a solid angle (1 steradian) by a point so ...

The process of modifying a building's structure.

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 total amount of electricity produced by a power plant.

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