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

A type of heating appliance that extracts so much of the available heat content from a combusted fuel that the moisture in the combustion gases condenses before it leaves the furnace. Also this furnace circulates a liquid to cool the furnace's heat exchan ...

Energy derived from resources that are regenerative or for all practical purposes can not be depleted. Types of renewable energy resources include moving water (hydro, tidal and wave power), thermal gradients in ocean water, biomass, geothermal energy, so ...

A solar photovoltaic product that generally consists of groups of PV cells electrically connected together to produce a specified power output under standard test conditions, mounted on a substrate, sealed with an encapsulant, and covered with a protectiv ...

Major energy consuming sectors of the economy. The Commercial Sector includes commercial buildings and private companies. The Industrial Sector includes manufacturers and processors. The Residential Sector includes private homes. The Transportation Sector ...

Materials that prevent or slow down the movement of heat.

The prevailing or average weather conditions of a geographic region.

In reference to wind energy, for any given instant, the power available in the wind is proportional to the cube of the wind velocity; when wind speed doubles, the power availability increases eight times.

A heat exchanger that transfers heat contained in a liquid heat transfer fluid to another liquid.

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

A turbine that generates power from the combustion of a fuel.

The physical measure of the subjective sensation of brightness; measured in lumens.

The production of electrical current from light.

A term used to describe heat energy lost from a water heater tank.

A hydrocarbon gas, C3H8, occurring in crude oil, natural gas, and refinery cracking gas. It is used as a fuel, a solvent, and a refrigerant. Propane liquefies under pressure and is the major component of liquefied petroleum (LPG).

To reduce or avoid the consumption of a resource or commodity.

A heat exchanger that transfers the heat contained in a liquid heat transfer fluid to air.

Large, flat boxes with glass covers and dark-colored metal plates inside that absorb and transfer solar energy to a heat transfer fluid.

Turbines in which the axis of the rotor's rotation is parallel to the wind stream and the ground.

An engine in which fuel is burned (or heat is applied) to the outside of a cylinder; a Stirling engine.