A mixture of substances that has a melting point lower than that of any mixture of the same substances in other proportions.

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

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 prevailing or average weather conditions of a geographic region.

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

The volume of a unit weight of a substance at a specific temperature and pressure.

A container that holds rock used as the thermal mass to store solar energy in a solar heating system.

The use of two or more different fuels (e.g. wood and coal) simultaneously in the same combustion chamber of a power plant.

A type of High-Intensity Discharge (HID) lamp that uses sodium under high pressure as the primary light-producing element. These high efficiency lights produce a golden white color and are used for interior industrial applications, such as in warehouses a ...

An air conditioning system that comes in two to five pieces: one piece contains the compressor, condenser, and a fan; the others have an evaporator and a fan. The condenser, installed outside the house, connects to several evaporators, one in each room to ...

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

The liquid resulting when water vapor contacts a cool surface; also the liquid resulting when a vaporized working fluid (such as a refrigerant) is cooled or depressurized.

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

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.

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 ...

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.

The total amount of electricity produced by a power plant.

A material formed from the incomplete combustion or destructive distillation (carbonization) of organic material in a kiln or retort, and having a high energy density, being nearly pure carbon. (If produced from coal, it is coke.) Used for cooking, the ma ...

The interior space of a building that is heated or cooled.

The process of degrading organic material (biomass) by microorganisms in aerobic conditions.