A refined petroleum product suitable for use as a fuel in internal combustion engines.

A material used to seal gaps around windows and exterior doors.

A thin sheet of material (metal) of a heat exchanger that conducts heat to a fluid.

The ratio of a photovoltaic cell's actual power to its power if both current and voltage were at their maxima. A key characteristic in evaluating cell performance.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

A measure of air purity that is equal to one complete air change (in an interior space).

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 ( ...

The maximum load that a device is capable of carrying.

The decomposition of organic material to alcohol, methane, etc., by organisms, such as yeast or bacteria, usually in the absence of oxygen.

Ventilation that is created by the differences in the distribution of air pressures around a building. Air moves from areas of high pressure to areas of low pressure with gravity and wind pressure affecting the airflow. The placement and control of doors ...

A battery-powered electrically driven vehicle.

A water heater that heats water before it is directly distributed for end use as required; a demand water heater.

The sum of all the costs both recurring and nonrecurring, related to a product, structure, system, or service during its life span or specified time period.

The use of devices to limit or prevent the release of pollution into the atmosphere.

A federal agency established in 1933 to develop the Tennessee river valley region of the southeastern U.S., and which is now nation's largest power producer.

A profile of how the wind speed changes with height above the surface of the ground or water.

The point or outdoor temperature where the heating capacity of a heat pump matches the heating requirements of a building.

The transfer of heat through a material by the transfer of kinetic energy from particle to particle; the flow of heat between two materials of different temperatures that are in direct physical contact.

The storage of heat energy during utility off-peak times at night, for use during the next day without incurring daytime peak electric rates.

A mechanical/electrical device used to pull air out of an interior space; usually located in the highest location of a building, in the ceiling, and venting to the attic or directly to the outside.