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

The transfer of heat by means of air currents.

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

Pounds/force per square inch absolute.

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

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

see Peak Watt.

Solar energy systems that collect or absorb solar energy for useful purposes. Can be used to generate high temperature heat (for electricity production and/or process heat), medium temperature heat (for process and space/water heating and electricity gene ...

The two times of the year when the sun is apparently farthest north and south of the earth's equator; usually occurring on or around June 21 (summer solstice in northern hemisphere, winter solstice for southern hemisphere) and December 21 (winter solstice ...

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

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

A tax credit granted for specific types of investments.

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

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

The potentially useful byproducts of ethanol fermentation process.

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.)

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 renewable energy system that includes two different types of renewable energy technologies that produce the same type of energy; for e.g., a wind turbine and a solar photovoltaic array combined to meet a power demand.

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.)