The angular position of the sun at solar noon with respect to the plane of the equator.

The conversion of biomass into a gas, by biogasification (see above) or thermal gasification, in which hydrogen is produced from high-temperature gasifying and low-temperature pyrolysis of biomass.

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

The pressure corresponding to the outlet velocity of a fan; the kinetic energy per unit volume of flowing air.

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

A material that retards the movement of water vapor through a building element (walls, ceilings) and prevents insulation and structural wood from becoming damp and metals from corroding. Often applied to insulation batts or separately in the form of treat ...

The maximum load that a motor is capable of supplying.

A measure of the heating requirements of a building expressed in Btu per degree-day.

A device used to simulate the angle of the sun for assessing shading potentials of building structures or landscape features.

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

A type of electrical current, the direction of which is reversed at regular intervals or cycles; in the U.S. the standard is 120 reversals or 60 cycles per second; typically abbreviated as AC.

A device that moves and/or circulates air and provides ventilation for a room or a building.

Any process that uses solar radiation to produce useful heat.

The process of determining energy consumption, by various techniques, of a building or facility.

A device used by energy auditors to pressurize a building to locate places of air leakage and energy loss.

An insulation product composed of loose fibers or fiber pellets that are blown into building cavities or attics using special pneumatic equipment.

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

The amount of heat energy that may be converted into useful energy from a fuel.

The weight of a material per unit of volume compared to the weight of the same volume of water.

A two step process where in the first step natural gas is exposed to a high-temperature steam to produce hydrogen, carbon monoxide, and carbon dioxide. The second step is to convert the carbon monoxide with steam to produce additional hydrogen and carbon ...