A solar water or space-heating system in which solar energy is collected, and/or moved by natural convection without using pumps or fans. Passive systems are typically integral collector/storage (ICS; or batch collectors) or thermosyphon systems. The majo ...

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

An aluminum foil fabricated insulator with backings applied to provide a series of closed air spaces with highly reflective surfaces.

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

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

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

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

The amount of heat in a quantity of matter at a specific temperature and pressure.

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.

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

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

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

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.

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 ...

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 ...

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

A mainly flat surface for transmitting radiant energy.

Solar collector thermal performance ratings based on collector efficiencies, usually expressed in Btu per hour for solar collectors under standard test or operating conditions for solar radiation intensity, inlet working fluid temperatures, and ambient te ...

The maximum value of natural solar insolation.

An electric current induced by radiant energy.