An instrument for measuring solar radiation.

A building energy auditing technique for locating areas of low insulation in a building envelope by means of a thermographic scanner.

The ratio of fuel energy input as heat per unit of net work output; a measure of a power plant thermal efficiency, generally expressed as Btu per net kilowatt-hour.

A mainly flat surface for transmitting radiant energy.

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

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 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.

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

Energy output from a system that equals energy input.

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).

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 ...

The area of glass that fits in the window frame.

The addition of dopants to a semiconductor.

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

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

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

The replacement of a non-functional or ineffective lamp with a new, more efficient lamp.

Classifications of fires developed by the National Fire Protection Association.

A type of incandescent lamp with an interior coating of aluminum that reflects light to the front of the bulb. They are designed to spread light over specific areas.