A device for conditioning air in an interior space. A Room Air Conditioner is a unit designed for installation in the wall or window of a room to deliver conditioned air without ducts. A Unitary Air Conditioner is composed of one or more assemblies that u ...

Any number of solar photovoltaic modules or solar thermal collectors or reflectors connected together to provide electrical or thermal energy.

Fans in which the direction of the flow of the air from inlet to outlet remains unchanged; includes propeller, tubaxail, and vaneaxial type fans.

The device in an air conditioner that distributes the filtered air from the return duct over the cooling coil/heat exchanger. This circulated air is cooled/heated and then sent through the supply duct, past dampers, and through supply diffusers to the liv ...

A reserve appliance; for example, a standby generator for a home or commercial building.

A turbine in which the flow of a steam or gas is essentially parallel to the rotor axis.

A vessel or tank where heat produced from the combustion of fuels such as natural gas, fuel oil, or coal is used to generate hot water or steam for applications ranging from building space heating to electric power production or industrial process heat.

A solar day; an interval between successive transits of the sun's center across an observer's meridian; the time thus measured is not equal to clock time.

The pressure of the air at sea level; one standard atmosphere at zero degrees centigrade is equal to 14.695 pounds per square inch (1.033 kilograms per square centimeter).

A heat exchanger element enclosed in a boiler. Water is circulated with a pump through the jacket where it picks up heat from the combustion chamber after which the heated water circulates to heat distribution devices. A water jacket is also an enclosed w ...

The minimum demand experienced by a power plant.

The load that a power generation unit or other electrical apparatus or heating unit is rated by the manufacture to be able to meet or supply.

The incremental cost to an electric power producer to generate or purchase a unit of electricity or capacity or both.

A type of radiant heating system where the radiator is located along an exterior wall where the wall meets the floor.

An electrical device that adjusts the leading current of an applied alternating current to balance the lag of the circuit to provide a high power factor.

A type of air compressor in which air is compressed in a series of stages as it flows axaily through a decreasing tubular area.

The water that is forced into a boiler to take the place of that which is evaporated in the generation of steam.

The difference between net electrical system capability and system maximum load requirements (peak load); the margin of capability available to provide for scheduled maintenance, emergency outages, system operating requirements and unforeseen loads.

The action of light on a biological system that results in the dissociation of a substrate, usually water, to produce hydrogen.

A passive or mechanical device used to ventilate an attic space, primarily to reduce heat buildup and moisture condensation.