A type of solar thermal collector that has tubes (pipes) that the heat transfer fluid flows through that are connected to a flat absorber plate.

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.

A room that faces south (in the northern hemisphere), or a small structure attached to the south side of a house.

A condition that can occur in a solar collector if the working fluid does not circulate when sun is shining on the collector.

The production of electrical current from light.

The generation of electricity or shaft power by an energy conversion system and the concurrent use of rejected thermal energy from the conversion system as an auxiliary energy source.

The trapping of light by refraction and reflection at critical angles inside a semiconductor device so that it cannot escape the device and must be eventually absorbed by the semiconductor.

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 ...

The prevailing or average weather conditions of a geographic region.

Energy derived from resources that are regenerative or for all practical purposes can not be depleted. Types of renewable energy resources include moving water (hydro, tidal and wave power), thermal gradients in ocean water, biomass, geothermal energy, so ...

A type of home mortgage that takes into account the energy savings of a home that has cost-effective energy saving improvements that will reduce energy costs thereby allowing the homeowner to more income to the mortgage payment. A borrower can qualify for ...

The low effective temperature of the sky on a clear night.

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

An instrument for measuring relative humidity by means of wet and dry-bulb temperatures.

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

Consists of businesses that are not engaged in transportation or manufacturing or other types of industrial activities. Standard Industrial Classification (SIC) codes for commercial establishments are 50 through 87, 89, and 91 through 97.

A type of heating appliance that extracts so much of the available heat content from a combusted fuel that the moisture in the combustion gases condenses before it leaves the furnace. Also this furnace circulates a liquid to cool the furnace's heat exchan ...

The U.S. Government's 12-month financial year, from October to September, of the following calender year; e.g.: FY 1998 extends from Oct. 1, 1997 to Sept. 30, 1988.

The physical measure of the subjective sensation of brightness; measured in lumens.