A heat exchanger that transfers the heat contained in a liquid heat transfer fluid to air.

The ratio of power produced by a wind energy conversion device to the power in a reference area of the free windstream.

A measure of the efficacy (efficiency) of lamps. It indicates the amount of light (lumens) emitted by the lamp for each unit of electrical power (Watts) used.

A solar collector that uses reflective surfaces to concentrate sunlight onto a small area, where it is absorbed and converted to heat or, in the case of solar photovoltaic (PV) devices, into electricity. Concentrators can increase the power flux of sunlig ...

The losses that result from inherent resistance in electrical conductors and transformation inefficiencies in distribution transformers in a transmission and distribution network.

A tubular material used to encase and protect one or more electrical conductors.

A class of energy producer that produces both heat and electricity from a single fuel.

Large, flat boxes with glass covers and dark-colored metal plates inside that absorb and transfer solar energy to a heat transfer fluid.

Turbines in which the axis of the rotor's rotation is parallel to the wind stream and the ground.

A device used to maintain a specified humidity in a conditioned space.

Glass, plastic panels, or plastic sheets that reduce air infiltration and some heat loss when attached to either the interior or exterior of existing windows.

A heat source, such as a space heater, used to provide more heat than that provided by a primary heating source.

An air conditioning system that has two ducts, one is heated and the other is cooled, so that air of the correct temperature is provided by mixing varying amounts of air from each duct.

A common utility monetary measure equal to one-thousandth of a dollar or a tenth of a cent.

A water heater that releases hot water from the top of the tank when a hot water tap is opened. To replace that hot water, cold water enters the bottom of the tank to ensure a full tank.

The process of modifying a building's structure.

The storage of compressed air in a container for use to operate a prime mover for electricity generation.

A type of High-Intensity Discharge (HID) lamp that uses sodium under high pressure as the primary light-producing element. These high efficiency lights produce a golden white color and are used for interior industrial applications, such as in warehouses a ...

Methyl Tertiary Butyl Ether (MTBE) is an ether compound used as a gasoline blending component to raise the oxygen content of gasoline. MTBE is made by combining isobutylene (from various refining and chemical processes) and methanol (usually made from nat ...

The measure of closeness in shape between a waveform and it's fundamental component.