A measure of the quality of a light source by expressing the color appearance correlated with a black body.

The time of the day, at a specific location, when the sun reaches its highest, apparent point in the sky; equal to true or due, geographic south.

The ratio of the sum of the noncoincidental maximum demands of two or more loads to their coincidental maximum demands for the same period.

The space between a hanging ceiling and the floor above or roof; usually contains HVAC ducts, electrical wiring, fire suppression system piping, etc.

Pounds/force per square inch absolute.

A solar heating system that uses a liquid as the heat transfer fluid.

see Peak Watt.

The amount of solar energy that passes through a glazing material, expressed as a percentage.

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

The total distribution of electromagnetic radiation emanating from the sun. The different regions of the solar spectrum are described by their wavelength range. The visible region extends from about 390 to 780 nanometers (a nanometer is one billionth of o ...

The process by which sunlight directly enters a building through the windows and is absorbed and stored in massive floors or walls.

A deposition process whereby heat is used to break molecules into elemental sources that are then spray deposited on a substrate.

The potentially useful byproducts of ethanol fermentation process.

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

The conversion of electric power to visible light by using an electric charge to excite gaseous atoms in a glass tube. These atoms emit ultraviolet radiation that is absorbed by a phosphor coating on the walls of the lamp tube. The phosphor coating produc ...

A tax credit granted for specific types of investments.

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

The lower or net heat of combustion for a fuel that assumes that all products of combustion are in a gaseous state. (See Net Heating Value below.)

A solid that contains pores; normally, it refers to interconnected pores that can transmit the flow of fluids. (The term refers to the aquifer geology when discussing sites for CAES.)

A method of financial and economic analysis used to determine present and future values of investments or expenses.