Material such as brick, rock, or stone.

The value of a personal portfolio, product, or investment after depreciation and interest on debt capital are subtracted from operating income. It can also be thought of as the equivalent worth of all cash flows relative to a base point called the present ...

The total amount of electric energy loss in an electric system between the generation source and points of delivery.

A unit or measure of solar radiation; 1 calorie per square meter or 3.69 Btu per square foot.

A unit of rate of operation. Electrical Hp: a measure of time rate of mechanical energy output; usually applied to electric motors as the maximum output; 1 electrical Hp is equal to 0.746 kilowatts or 2,545 Btu per hour. Shaft Hp: a measure of the actual ...

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 process of producing electricity by transforming other forms or sources of energy into electrical energy; measured in kilowatt-hours.

A corporation, person, agency, authority or other legal entity that owns and/or operates facilities for the generation, transmission, distribution or sale of electricity primarily for use by the public.

A measure of the average amount of a specified pollutant or material emitted for a specific type of fuel or process.

A type of cooling system that uses a charging and discharging cycle with a thermal or latent heat storage subsystem.

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

Those privately or publicly owned establishments that generate, transmit, distribute, or sell electricity.

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.

The amount (percent) of light that is reflected by a surface relative to the amount that strikes it.

The maximum value of natural solar insolation.

A lamp where the light beam is focused 2 inches ahead of the lamp reducing the amount of light trapped in the fixture.

A device that transfers heat by the continuous evaporation and condensation of an internal fluid.

An electric current induced by radiant energy.

Thermosyphon systems use a separate storage tank located above the collector. Liquid warmed in the collector rises naturally above the collector, where it is kept until it is needed. The liquid can be either water or a glycol solution. If the fluid is wat ...

A measure of the effective cooling capacity of a refrigerator, expressed in Btu per hour or in tons, where one (1) ton of capacity is equal to the heat required to melt 2,000 pounds of ice in 24 hours or 12,000 Btu per hour.