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.)

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

A solar energy system designed to provide heat to individual rooms in a building.

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

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

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.

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

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

A popular term for energy produced from renewable energy resources.

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

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

A measure of light quality. The maximum CRI value of 100 is given to natural daylight and incandescent lighting. The closer a lamp's CRI rating is to 100, the better its ability to show true colors to the human eye.

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

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 air that is supplied to the combustion chamber of a furnace.

Thermal energy that is used in agricultural and industrial operations.

The weight of water vapor, per unit weight of dry air.

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 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.