see Solar Spectrum above.

A commonly used analysis for reporting fuel properties; may be on a dry (moisture free) basis, as "fired", or on an ash and moisture free basis. Fractions usually reported include: volatile matter, fixed carbon, moisture, ash, and heating value (higher he ...

The air that is supplied to the combustion chamber of a furnace.

The percentage of a building's seasonal energy requirements that can be met by a solar energy device(s) or system(s).

The damping of interior temperature fluctuations by massive construction.

Pounds/force per square inch absolute.

A generator with a single armature coil, which may have many turns and the alternating current output consists of a succession of cycles.

That amount of cooling energy to be supplied (or heat and humidity removed) based on the sensible and latent loads.

The mean distance a free electron or hole moves before recombining with another hole or electron.

The fine particulate matter entrained in the flue gases of a combustion power plant.

A chemical element, of atomic number 14, that is semi-metallic, and an excellent semiconductor material used in solar photovoltaic devices; commonly found in sand.

A plot of a wind energy conversion device's power output versus wind speed.

One layer of glass in a window frame. It has very little insulating value (R-1) and provides only a thin barrier to the outside and can account for considerable heat loss and gain.

That portion of an electricity supply system used to deliver electricity from points on the transmission system to consumers.

A water and energy conserving device that limits the amount of water that a faucet or showerhead can deliver.

The region between an n-layer and a p-layer in a single material, photovoltaic cell.

A measure of light quality. The maximum CRI value of 100 is given to natural daylight and incandescent lighting. The closer a lamp's CRI rating is to 100, the better its ability to show true colors to the human eye.

The interior area of a building, calculated in square feet or meters.

The quantity of heat that a cooling appliance is capable of removing from a room in one hour.

A fuel gas with a heating value between 90 and 200 Btu per cubic foot.