A heat exchanger in which two fluids flow in opposite directions for transfer heat energy from one to the other.

A source of power (electricity) that can displace power from another source so that source's power can be transmitted to more distant loads.

The conversion of electric power to visible light by using an electric charge to excite gaseous atoms in a glass tube. These atoms emit ultraviolet radiation that is absorbed by a phosphor coating on the walls of the lamp tube. The phosphor coating produc ...

A coating applied to the surface of the glazing of a window to reduce heat transfer through the window.

Materials with high thermal energy storage capacity contained in or part of a building's walls, floors, or freestanding elements.

A popular term for energy produced from renewable energy resources.

A type of solar thermal system where sunlight is concentrated by a curved reflector onto a pipe containing a working fluid that can be used for process heat or to produce electricity. The world's largest solar thermal electric power plants use solar troug ...

Water in vapor form; used as the working fluid in steam turbines and heating systems.

The potentially useful byproducts of ethanol fermentation process.

A fuel gas with a heating value between 90 and 200 Btu per cubic foot.

A method used to estimate building heating loads by assuming that heat loss and gain is proportional to the equivalent heat-loss coefficient for the building envelope.

The interior area of a building, calculated in square feet or meters.

The quantity of heat that a cooling appliance is capable of removing from a room in one hour.

A solid that contains pores; normally, it refers to interconnected pores that can transmit the flow of fluids. (The term refers to the aquifer geology when discussing sites for CAES.)

A type of high intensity discharge light that has the most lumens per watt of any light source.

Salt mixtures with potential applications as solar thermal energy storage materials.

Those gases, such as water vapor, carbon dioxide, tropospheric ozone, methane, and low level ozone that are transparent to solar radiation, but opaque to long wave radiation, and which contribute to the greenhouse effect.

Strips of material used to separate multiple panes of glass within the windows.

A solar photovoltaic device with a specified area.

The total distribution of electromagnetic radiation emanating from the sun. The different regions of the solar spectrum are described by their wavelength range. The visible region extends from about 390 to 780 nanometers (a nanometer is one billionth of o ...