The heat absorbed or released when a substance undergoes a change in temperature.

A drag-type wind machine that can react to wind from any direction.

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.

Those elements of building used to control the interior climate.

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

The first law states that energy can not be created or destroyed; the second law states that when a free exchange of heat occurs between two materials, the heat always moves from the warmer to the cooler material.

A WECS that is used to grind grain, and that typically has a high-solidity rotor; commonly used to refer to all types of WECS.

A large number of thermocouples connected in series.

The pressure of the steam or water in a boiler as measured; usually expressed in pounds per square inch gauge (psig).

The rate of heat production by a steady current in any part of an electrical circuit that is proportional to the resistance and to the square of the current, or, the internal energy of an ideal gas depends only on its temperature.

A charge for the maximum rate at which energy is used during peak hours of a billing period. That part of a utility service charged for on the basis of the possible demand as distinguished from the energy actually consumed.

A building energy auditing technique used to determine and/or locate air leaks in a building shell or envelope.

Draft that is caused by temperature differences in the air.

A type of insulation, composed of small diameter pink, yellow, or white glass fibers, formed into blankets or batts, or used in loose-fill and blown-in applications.

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 ( ...

These brines are hot (300 F to 400 F) (149 C to 204 C) pressurized waters that contain dissolved methane and lie at depths of 10,000 ft (3048 m) to more than 20,000 ft (6096 m) below the earth's surface. The best known geopressured reservoirs lie along th ...

The prescribed level of pollutants allowed in outside or indoor air as established by legislation.

Gasoline fuel additives such as ethanol, ETBE, or MTBE that add extra oxygen to gasoline to reduce carbon monoxide pollution produced by vehicles.

A device for converting a solid fuel to a gaseous fuel.

Waste material from households and businesses in a community that is not regulated as hazardous.