The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.

see Peak Watt.

A turbine that has a runner with attached blades similar to a propeller used to drive a ship. As water passes over the curved propeller blades, it causes rotation of the shaft.

In reference to solar photovoltaic cell manufacure, a method of growing a large-size, high-quality crystal whereby coils heat a polycrystalline ingot placed atop a single-crystal seed. As the coils are slowly raised the molten interface beneath the coils ...

Fabricated as a single structure.

A type of solar photovoltaic device made in a continuous process of pulling material from a molten bath of photovoltaic material, such as silicon, to form a thin sheet of material.

A type of building ventilation system that uses fans or blowers to provide fresh air to rooms when the forces of air pressure and gravity are not enough to circulate air through a building.

The region between an n-layer and a p-layer in a single material, photovoltaic cell.

An axail flow fan mounted in a section of duct to move conditioned air.

Recombination occurring in the emitter region of a photovoltaic cell.

A single photovoltaic device.

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 ...

A generator with a single armature coil, which may have many turns and the alternating current output consists of a succession of cycles.

Solar Two is a retrofit of the Solar One project (see above). It is demonstrating the technical feasibility and power potential of a solar power tower using advanced molten-salt technology to store energy. Solar Two retains several of the main components ...

An arrangement of photovoltaic cells or material mounted on a rigid flat surface with the cells exposed freely to incoming sunlight.

A machine supplied with external energy that is converted into force and/or motion.

The tank of a water heater.

A type of house that has massive amounts of insulation, airtight construction, and controlled ventilation without sacrificing comfort, health, or aesthetics.

The amount of money required to secure a specified cash flow at a future date at a specified return.

A type of furnace in which fuel is spread, automatically or mechanically, across the furnace grate.