A method for making sheets of polycrystalline silicon (for solar photovlotaic devices) in which molten silicon is drawn upward by capillary action through a mold.

Fans in which the direction of the flow of the air from inlet to outlet remains unchanged; includes propeller, tubaxail, and vaneaxial type fans.

An outdoor temperature, usually 20 to 45 degrees Fahrenheit, at which a heatpump's output equals the heating demand. Below the balance point, supplementary heat is needed.

The angle between true south and the point on the horizon directly below the sun.

The fibrous material remaining after the extraction of juice from sugarcane; often burned by sugar mills as a source of energy.

Single-celled organisms, free-living or parasitic, that break down the wastes and bodies of dead organisms, making their components available for reuse by other organisms.

A generator producing alternating current by the rotation of its rotor, and which is powered by a primary mover.

An energy storage device composed of one or more electrolyte cells.

The non-combustible residue of a combusted substance composed primarily of alkali and metal oxides.

A solar day; an interval between successive transits of the sun's center across an observer's meridian; the time thus measured is not equal to clock time.

A heat exchanger element enclosed in a boiler. Water is circulated with a pump through the jacket where it picks up heat from the combustion chamber after which the heated water circulates to heat distribution devices. A water jacket is also an enclosed w ...

The amount of heat given off by a person at rest in a comfortable environment; approximately 50 Btu per hour (Btu/h).

A device for conditioning air in an interior space. A Room Air Conditioner is a unit designed for installation in the wall or window of a room to deliver conditioned air without ducts. A Unitary Air Conditioner is composed of one or more assemblies that u ...

An instrument for measuring the force or velocity of wind; a wind guage.

The ratio of light output of a fluorescent lamp operated on a ballast to the light output of a lamp operated on a standard or reference ballast.

An air infiltration measurement technique developed by the Brookhaven National Laboratory to measure changes over time (one week to five months) when determining a building's air infiltration rate. This test cannot locate exact points of infiltration, but ...

The amount of money needed to purchase equipment, buildings, tools, and other manufactured goods that can be used in production.

The conversion of one form of energy into another by the action of plants or microorganisms. The conversion of biomass to ethanol, methanol, or methane.

The pressure of the air at sea level; one standard atmosphere at zero degrees centigrade is equal to 14.695 pounds per square inch (1.033 kilograms per square centimeter).

An air pollution control device used to filter particulates from waste combustion gases; a chamber containing a bag filter.