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 amount of energy produced as a percentage of the amount of energy consumed.

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

A solar photovoltaic device with a specified area.

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

The type of alternative current generated by alternating current generators, rotary inverters, and solid-state inverters.

Strips of material used to separate multiple panes of glass within the windows.

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

A type of insulation that is molded or expanded to produce coarse, closed cells containing air. The rigid cellular structure provides thermal and acoustical insulation, strength with low weight, and coverage with few heat loss paths. Often used to insulat ...

The process of controlling indoor moisture levels and condensation.

A type of anaerobic digester that has a horizontal tank in which a constant volume of material is added and forces material in the tank to move through the tank and be digested.

A national trade association of solar energy equipment manufacturers, retailers, suppliers, installers, and consultants.

The period marked by successive crossing of the earth's meridian by the sun; the hour angle of the sun at a point of observance (apparent time) is corrected to true (solar) time by taking into account the variation in the earth's orbit and rate of rotatio ...

The damping of interior temperature fluctuations by massive construction.

The weight of water vapor, per unit weight of dry air.

The apparent angle of the sun north or south of the eath's equatorial plane. The earth's rotation on its axis causes a daily change in the declination.

The monochromatic irradiance of a surface per unit bandwidth at a particular wavelength, usually expressed in Watts per square meter-nanometer bandwidth.

Usually refers to ethanol to 160 to 200 proof.

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