The component of a combustion device that regulates the amount of air entering the combustion chamber.

A type of electrical current, the direction of which is reversed at regular intervals or cycles; in the U.S. the standard is 120 reversals or 60 cycles per second; typically abbreviated as AC.

A process for carrying out a reaction in which the reactants are fed in discrete and successive charges.

A quantity of (solid) biomass fuel equal to 2,400 pounds bone dry.

The action of light on a biological system that results in the dissociation of a substrate, usually water, to produce hydrogen.

A unit of measure for an electrical current; the amount of current that flows in a circuit at an electromotive force of one Volt and at a resistance of one Ohm. Abbreviated as amp.

A component of a electrochemical battery. A 'primary' cell consists of two dissimilar elements, known as 'electrodes,' immersed in a liquid or paste known as the 'electrolyte.' A direct current of 1-1.5 volts will be produced by this cell. A 'secondary' c ...

The temperature at which a material ignites.

A chemical change in a substance that results from the passage of an electric current through an electrolyte. The production of commercial hydrogen by separating the elements of water, hydrogen, and oxygen, by charging the water with an electrical current ...

A type of heating fuel derived by refining crude oil that has a boiling range at atmospheric pressure from 400 degrees to 550 degrees F.

The power conduit of an electric power plant; the starting point of the electric transmission system.

The usually unfinished space above a ceiling and below a roof.

In reference to solar energy systems, the angle at which direct sunlight strikes a surface; the angle between the direction of the sun and the perpindicular to the surface. Sunlight with an incident angle of 90 degrees tends to be absorbed, while lower an ...

In a solar energy system, refers to all components other than the collector. In terms of costs, it includes design costs, land, site preparation, system installation, support structures, power conditioning, operation and maintenance costs, indirect storag ...

The chemical element commonly used as the dopant in solar photovoltaic device or cell material.

A thin coating of a material applied to a photovoltaic cell surface that reduces the light reflection and increases light transmission.

Two metals of different coefficients of expansion welded together so that the piece will bend in one direction when heated, and in the other when cooled, and can be used to open or close electrical circuits, as in thermostats.

A method of predicting heating and/or cooling loads using instantaneous load calculation at different outdoor dry-bulb temperatures, and multiplying the result by the number of hours of occurrence of each temperature.

42 U.S. gallons (306 pounds of oil, or 5.78 million Btu).

A device, such as a steel plate, used to check, retard, or divert a flow of a material.