Alternating current in which three separate pulses are present, identical in frequency and voltage, but separated 120 degrees in phase.

The energy developed through the use of heat energy.

The force that pulls a wind turbine blade, as opposed to drag.

The quantity of heat necessary to raise the temperature of a specific mass of a substance by one degree.

A unit of rate of operation. Electrical Hp: a measure of time rate of mechanical energy output; usually applied to electric motors as the maximum output; 1 electrical Hp is equal to 0.746 kilowatts or 2,545 Btu per hour. Shaft Hp: a measure of the actual ...

To exceed the design capacity of a device.

A type of heat pump that uses the ground, ground water, or ponds as a heat source and heat sink, rather than outside air. Ground or water temperatures are more constant and are warmer in winter and cooler in summer than air temperatures. Geothermal heat p ...

The trapping of light inside a semiconductor material by refracting and reflecting the light at critical angles; trapped light will travel further in the material, greatly increasing the probability of absorption and hence of producing charge carriers.

The processes that a work input/output system undergoes and in which the initial and final states are identical.

The flow of heat from one area to another by conduction, convection, and/or radiation. Heat flows naturally from a warmer to a cooler material or space.

A room heat delivery (or exchanger) component of a hydronic (hot water or steam) heating system; hot water or steam is delivered to it by natural convection or by a pump from a boiler.

The transfer of heat through matter or space by means of electromagnetic waves.

The standard method for calculating residential cooling loads developed by the Air-Conditioning and Refrigeration Institute (ARI) and the Air Conditioning Contractors of America (ACCA) based largely on the American Society of Heating, Refrigeration, and A ...

Any coefficient used to calculate heat transmission by conduction, convection, or radiation through materials or structures.

A material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy. These films are retrofitted on existing windows.

A furnace/combustion chamber in which finely ground fuel is blown in spirals in the combustion chamber to maximize combustion efficiency.

A type of window glass that contains special tints that cause the window to absorb as much as 45% of incoming solar energy, to reduce heat gain in an interior space. Part of the absorbed heat will continue to be passed through the window by conduction and ...

The structural elements (walls, roof, floor, foundation) of a building that encloses conditioned space; the building shell.

The space within a building or structure that is normally occupied by people, and that may be conditioned (heated, cooled and/or ventilated).

A device that releases pressure within a radiator when the pressure inside exceeds the operating limits of the vent.