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

The addition of dopants to a semiconductor.

A unit of pressure for a fluid, commonly used in water pumping and hydropower to express height a pump must lift water, or the distance water falls. Total head accounts for friction head losses, etc.

Classifications of fires developed by the National Fire Protection Association.

A system capable of rotating about one axis.

A material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy. These films are retrofitted on existing windows.

The quantity of heat necessary to raise the temperature of a specific mass of a substance by one degree.

A raw material that can be converted to one or more products.

Energy produced by the conversion of biomass directly to heat or to a liquid or gas that can be converted to energy.

This is an independent regulatory agency within the U.S. DOE that has jurisdiction over interstate electricity sales, wholesale electric rates, natural gas pricing, oil pipeline rates, and gas pipeline certification. It also licenses and inspects private, ...

A seal used to prevent the leakage of fluids, and also maintain the pressure in an enclosure.

The effect of cooling by the radiation of heat from a building to the night sky.

A type of turbine in which combusted, pressurized gas is directed against a series of blades connected to a shaft, which forces the shaft to turn to produce mechanical energy.

A turbine that is driven by high velocity jets of water or steam from a nozzle directed to vanes or buckets attached to a wheel. (A pelton wheel is an impulse hydroturbine).

Energy supplied during periods of relatively high system demands as specified by the supplier.

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 ...

A measure of the efficiency of an appliance's energy efficiency.

Site planning that accounts for natural solar heating and cooling processes and their relationship to building shape, orientation, and siting.

The energy developed through the use of heat energy.

A layer of semiconductor material, such as copper indium diselenide or gallium arsenide, a few microns or less in thickness, used to make solar photovoltaic cells.