The abrupt and large increase in electrical conductivity exhibited by some metals as the temperature approaches absolute zero.

A device for removing heat from a gas or liquid stream for air conditioning/cooling.

The production of electrical current from light.

The energy lost from the movement of a fluid in a conduit (pipe) due to the disturbances created by the contact of the moving fluid with the surfaces of the conduit, or the additional pressure that a pump must provide to overcome the resistance to fluid f ...

The process of sending or moving electricity from one point to another; usually defines that part of an electric utility's electric power lines from the power plant buss to the last transformer before the customer's connection.

A process for making inexpensive Galium Arsenide (GaAs)photovoltaic cells in which a thin film of GaAs is grown atop a thick, single-crystal GaAs (or other suitable material) substrate and then is cleaved from the substrate and incorporated into a cell, a ...

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 common utility monetary measure equal to one-thousandth of a dollar or a tenth of a cent.

A form of solar concentrating collector that does not track the sun.

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

A slab floor that sits directly on top of the surrounding ground.

A device built into or installed above a combustion appliance to assure the escape of combustion byproducts, to prevent backdrafting of the appliance, or to neutralize the effects of the stack action of the chimney or vent on the operation of the applianc ...

A measure of the surface burning characteristics of a material.

The average time a minority carrier exists before recombination.

A type of power inverter that produce a high quality (nearly sinusoidal) voltage, at minimum current harmonics.

A system in which a working fluid is used over and over without introduction of new fluid, as in a hydronic heating system or mechanical refrigeration system.

Crops grown specifically for their fuel value. These include food crops such as corn and sugarcane, and nonfood crops such as poplar trees and switchgrass. Currently, two energy crops are under development: short-rotation woody crops, which are fast-growi ...

A device that reduces heat loss at night and during cloudy periods and heat gain during the day in warm weather. A movable insulator could be an insulative shade, shutter panel, or curtain.

The prevailing or average weather conditions of a geographic region.

Any machine capable of producing power to do work. An electric or hydraulic motor, steam engine or similar drive, acting directly on the deck machinery. Note—In a diesel electric motor is the prime mover.