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

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 ...

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

The negative pole or electrode of an electrolytic cell, vacuum tube, etc., where electrons enter (current leaves) the system; the opposite of an anode.

Energy terms

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

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

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

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

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 ...

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

Water saturated or strongly impregnated with salt.

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

The interior heat gain due to heat conduction, convection, and radiation from the exterior into the interior, and from occupants and appliances.

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

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 ...

Heat stored above room temperature (in a solar heating system).

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.