The unit price of a good or service estimated from some base year in order to provide a consistent means of comparison.

Individual rooms or zones in a building where temperature is controlled separately from other rooms or zones.

The process of characterizing the wind resource, and its energy potential, for a specific site or geographical area.

The addition of dopants to a semiconductor.

A hydrocarbon gas obtained from underground sources, often in association with petroleum and coal deposits. It generally contains a high percentage of methane, varying amounts of ethane, and inert gases; used as a heating fuel.

A measure of the efficiency of converting a fuel to energy and useful work; useful work and energy output divided by higher heating value of input fuel times 100 (for percent).

An elementary particle of an atom with a negative electrical charge and a mass of 1/1837 of a proton; electrons surround the positively charged nucleus of an atom and determine the chemical properties of an atom.

Energy output from a system that equals energy input.

Materials with various qualities that are applied to glass windows before installation. These coatings reduce radiant heat transfer through the window and also reflects outside heat and a portion of the incoming solar energy, thus reducing heat gain. The ...

An instrument for measuring solar radiation.

Classifications of fires developed by the National Fire Protection Association.

A mainly flat surface for transmitting radiant energy.

A solar energy conversion device that has a bowl shaped dish covered with a highly reflective surface that tracks the sun and concentrates sunlight on a fixed absorber, thereby achieving high temperatures, for process heating or to operate a heat (Stirlin ...

One thousand kilowatt-hours or 1 million watt-hours.

The electrical power that oscillates between the magnetic field of an inductor and the electrical field of a capacitor. Reactive power is never converted to non-electrical power. Calculated as the square root of the difference between the square of the ki ...

The process of using heat that is rejected in one part of a cycle for another function or in another part of the cycle.

Material such as brick, rock, or stone.

The minimum temperature at which combustion of a solid or fluid can occur.

The ratio of the minimum amount of work or energy required to perform a task to the amount actually used.

A device that produces mechanical energy directly from two heat reservoirs of different temperatures. A machine that converts thermal energy to mechanical energy, such as a steam engine or turbine.