In reference to solar energy systems, the angle that a solar collector is positioned above horizontal.

The transformation on a compound or material into one or more substances by heat alone (without oxidation). Often called destructive distillation. Pyrolysis of biomass is the thermal degradation of the material in the absence of reacting gases, and occus ...

Energy terms

A unit of apparent power, equal to 1,000 volt-amperes; the mathematical product of the volts and amperes in an electrical circuit.

An enzyme complex, produced by fungi and bacteria, capable of decomposing cellulose into small fragments, primarily glucose.

A long, underground metal or plastic pipe through which air is drawn. As air travels through the pipe it gives up some of its heat to the soil, and enters the house as cooler air.

An air distribution outlet, typically located in the ceiling, which mixes conditioned air with room air.

The overall rate of heat loss from a building by means of transmission plus infiltration, expressed in Btu per hour, per degree temperature difference between the inside and outside.

A mound of dirt next to exterior walls to provide wind protection and insulation.

The downward facing structural element that is directly opposite the floor.

A type of heat pump that transfers heat from outdoor air to indoor air during the heating season, and works in reverse during the cooling season.

Energy produced by the internal heat of the earth; geothermal heat sources include: hydrothermal convective systems; pressurized water reservoirs; hot dry rocks; manual gradients; and magma. Geothermal energy can be used directly for heating or to produce ...

Energy available as a result of motion that varies directly in proportion to an object's mass and the square of its velocity.

The conversion of the complex carbohydrates in organic material into energy.

A generic term for a glazed opening that allows daylight to enter into a building and can be opened for ventilation.

The transparent or opaque sphere in an electric light that the electric light transmits through.

The ratio of solar collector array area to actual land area.

An electricity supplier rate structure in which the per unit price of electricity decreases as the amount of energy increases. Normally only available to very large consumers.

To disconnect a transmission and/or distribution line; a power line that is not carrying a current; to open a circuit.

A metric unit of energy or work; the energy produced by a force of one Newton operating through a distance of one meter; 1 Joule per second equals 1 Watt or 0.737 foot-pounds; 1 Btu equals 1,055 Joules.