A passage for surplus water to flow over or around a dam.

Electric power plant or utility capacity on line and running at low power in excess of actual load.

A photovoltaic device where incident sunlight is split into different spectral regions, with an optical apparatus, that are directed to individual photovoltaic cells that are optimized for converting that spectrum to electricity.

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 ...

A deposition process whereby heat is used to break molecules into elemental sources that are then spray deposited on a substrate.

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

A process used to apply photovoltaic semi-conductor material to a substrate by a physical vapor deposition process where high-energy ions are used to bombard elemental sources of semiconductor material, which eject vapors of atoms that are then deposited ...

A type of inverter that produces square wave output.; consists of a DC source, four switches, and the load. The switches are power semiconductors that can carry a large current and withstand a high voltage rating. The switches are turned on and off at a c ...

This is another name for an induction motor. The motors consist of a rotor inside a stator. The rotor has laminated, thin flat steel discs, stacked with channels along the length. If the casting composed of bars and attached end rings were viewed without ...

A smokestack or flue for exhausting the products of combustion from a combustion appliance.

Sensible and latent heat contained in combustion gases and vapor emitted to the atmosphere.

The tendency of the sunlight to electricity conversion efficiency of amorphous silicon photovoltaic devices to degrade (drop) upon initial exposure to light.

A condition that can occur in a solar collector if the working fluid does not circulate when sun is shining on the collector.

In reference to a wind turbine, a condition when the rotor stops turning.

A power source/generator that operates independently of or is not connected to an electric transmission and distribution network; used to meet a load(s) physically close to the generator.

An inverter that operates independent of or is not connected to an electric transmission and distribution network.

Air with a weight of 0.075 pounds per cubic foot with an equivalent density of dry air at a temperature of 86 degrees Fahrenheit and standard barometric pressure of 29.92 inches of mercury.

In refrigeration, an evaporating temperature of 5 degrees Fahrenheit (F), a condensing temperature of 86 degrees F., liquid temperature before expansion of 77 degrees F., and suction temperature of 12 degrees F.

A column of gas at standard conditions of temperature and pressure (32 degrees Fahrenheit and one atmosphere).

Standardized codes used to classify businesses by type of activity they engage in.