The fine liquid or solid particles contained in combustion gases. The quantity and size of particulates emitted by cars, power and industrial plants, wood stoves, etc are regulated by the U.S. Environmental Protection Agency.

An electrical device for converting alternating current to direct current. The chamber in a cooling device where water is separated from the working fluid (for example ammonia).

A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related.

The amount of heat that a material can absorb and store.

The loss of heat as the water circulates through a water heater tank and inlet and outlet pipes.

A fluid used to absorb and transfer heat energy.

The average power output of a wind energy conversion system at a given mean wind speed based on a Raleigh frequency distribution.

The process of implementing measures to reduce peak power demands on a system.

The cost of producing one additional unit of a product.

A power source/generator that operates independently of or is not connected to an electric transmission and distribution network; used to meet a load(s) physically close to the generator.

The process of changing from one physical state (solid, liquid, or gas) to another, with a necessary or coincidental input or release of energy.

A solar absorber surface that has high absorbtance at wavelengths corresponding to that of the solar spectrum and low emittance in the infrared range.

The amount of kinetic energy gained by an electron when accelerated through an electric potential difference of 1 Volt; equivalent to 1.603 x 10

A device used to transfer heat from a fluid (liquid or gas) to another fluid where the two fluids are physically separated.

A popular term used to describe the increase in average global temperatures due to the greenhouse effect.

A device for measuring power consumption.

The labels placed on appliances to enable consumers to compare appliance energy efficiency and energy consumption under specified test conditions as required by the Federal Trade Commission.

A construction material made by compressing earth in a form; used traditionally in many areas of the world and widely throughout North Africa and the Middle East.

A term applied to warm-air heating systems that deliver heated air to rooms by means of registers or baseboards located along exterior walls.

A structure or media from which heat can be absorbed or extracted.