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 rate of flow of the wind undisturbed by obstacles.

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

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

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

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

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 ...

Material such as brick, rock, or stone.

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

One thousand kilowatts, or 1 million watts; standard measure of electric power plant generating capacity.

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

The maximum value of natural solar insolation.

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

A pole used to assist in raising a tower.

Fuels that cannot be easily made or "renewed," such as oil, natural gas, and coal.

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

A discontinuance of electric power supply.

An index that combines sensible temperature and air humidity to arrive at a number that closely responds to the effective temperature; used to relate temperature and humidity to levels of comfort.

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