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

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

Water saturated or strongly impregnated with salt.

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

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

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

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

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

Energy systems supply individual, or small-groups, of energy loads.

The process or technologies for producing energy by harnessing the temperature differences (thermal gradients) between ocean surface waters and that of ocean depths. Warm surface water is pumped through an evaporator containing a working fluid in a closed ...

Energy terms

A building structural element that is built onto a building's exterior along the inner edges of all the windows, and extending from the ground to the eaves. Wingwalls help ventilate rooms that have only one exterior wall which leads to poor cross ventilat ...

That portion of supply air that is drawn from outside, plus any recirculated air that has been treated to maintain a desired air quality.

A type of impulse hydropower turbine where water passes through nozzles and strikes cups arranged on the periphery of a runner, or wheel, which causes the runner to rotate, producing mechanical energy. The runner is fixed on a shaft, and the rotational mo ...

A generic term for liquefied and pressurized gas, ordinarily butane, propane, or a mixture of the two, contained in a cylinder for domestic use.

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

The purpose for which useful energy or work is consumed.

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.

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