The wind speed and direction in an undisturbed flow.

A type of (geothermal) heat pump that uses well (ground) or surface water as a heat source. Water has a more stable seasonal temperature than air thus making for a more efficient heat source.

A device used by energy auditors to pressurize a building to locate places of air leakage and energy loss.

A power line for supplying electricity within a specified area.

A compound used to make certain types of solar photovoltaic cells.

A type of lamp having a lens of heavy durable glass that focuses the light. They have longer lifetimes with less lumen depreciation than standard incandescents.

A type of wind turbine in which the axis of rotation is perpendicular to the wind stream and the ground.

The unit of illuminance equivalent to 1lumen per square meter.

The production of an electric current in a conductor by the variation of a magnetic field in its vicinity.

The housing around a motor that supports the active parts and protects them. They come in different varieties (open, protected) depending on the degree of protection required.

A material that can be used to store thermal energy as latent heat. Various types of materials have been and are being investigated such as inorganic salts, eutectic compounds, and parrafins, for a variety of applications, including solar energy storage ( ...

Turbines in which the rotor speed increases and decreases with changing wind speed, producing electricity with a variable frequency.

A means to increase the thermal efficiency of a steam electric generating system by converting some waste heat from the condenser into electricity. The heat engine in a bottoming cycle would be a condensing turbine similar in principle to a steam turbine ...

As defined in the Energy Security Act (P.L. 96-294; 1980) as "any organic matter, including sewage, sewage sludge, and industrial or commercial waste, and mixtures of such matter and inorganic refuse from any publicly or privately operated municipal waste ...

The maximum possible voltage across a photovoltaic cell; the voltage across the cell in sunlight when no current is flowing.

A group of organic compounds composed of carbon, hydrogen, and oxygen; a series of molecules composed of a hydrocarbon plus a hydroxyl group; includes methanol, ethanol, isopropyl alcohol and others.

Draft that is caused by temperature differences in the air.

A large number of thermocouples connected in series.

A heat absorbing reaction or a reaction that requires heat.

A light source composed of a metal base, a glass tube filled with an inert gas or a vapor, and base pins to attach to a fixture.