Acronym for American Society of Heating, Refrigerating and Air- Conditioning Engineers.

A long slender tube that holds fissionable material (fuel) for nuclear reactor use. Fuel rods are assembled into bundles called fuel elements or assemblies, which are loaded individually into the reac [..]

The total amount of solar radiation (direct, diffuse, and reflected) striking a surface exposed to the sky.

Energy which is not obtained from depletable energy sources. [See California Code of Regulations, Title 24, Section 2-5302]

Degree of hotness or coldness measured on one of several arbitrary scales based on some observable phenomenon (such as the expansion).

The ratio of the radiation absorbed by a surface to the total energy falling on that surface described as a percentage.

A charge paid by all market participants withdrawing energy from the ISO controlled grid. The access charge will recover the portion of a utility's transmission revenue requirement not recovered [..]

Solar radiation used by special equipment to provide space heating, hot water or electricity.

A system designed to convert solar radiation into usable energy for space, water heating, or other uses. It requires a mechanical device, usually a pump or fan, to collect the sun's energy.

A standard rating term that was used to rate the efficiency of heat pumps in California. ACOP was replaced by Heating Seasonal Performance Factor (HSPF) in 1988.