Water saturated or strongly impregnated with salt.

The process of decomposing biomass with anaerobic bacteria to produce biogas.

That fraction of annual energy demand supplied by a solar system.

see Air-Source Heat Pump.

A building architectural element (vestibule) with two airtight doors that reduces the amount of air infiltration and exfiltration when the exterior most door is opened.

A movable plate used to control air flow; in a wood stove or fireplace, used to control the amount and direction of air going to the fire.

An ideal substance that absorbs all radiation falling on it, and reflecting nothing.

Electromagnetic radiation in the wavelength range of 4 to 400 nanometers.

A mechanical device used for air circulation and to provide cooling.

The process of determining energy consumption, by various techniques, of a building or facility.

A material or structural element that inhibits air flow into and out of a building's envelope or shell. This is a continuous sheet composed of polyethylene, polypropylene, or extruded polystyrene. The sheet is wrapped around the outside of a house during ...

A unit for measuring the extent that the outdoor daily average temperature (the mean of the maximum and minimum daily dry-bulb temperatures) falls below (in the case of heating, see Heating Degree Day), or falls above (in the case of cooling, see Cooling ...

In reference to solid biomass fuels, such as wood, having zero moisture content.

The maximum heat output (in Btu per hour) released by a burner with a stable flame and satisfactory combustion.

The ratio of light reflected by a surface to the light falling on it.

An opening; in solar collectors, the area through which solar radiation is admitted and directed to the absorber.

The total cost of production divided by the total quantity produced.

A type of hydroturbine in which the entire generator is mounted inside the water passageway as an integral unit with the turbine. These installations can offer significant reductions in the size of the powerhouse.

A measure of seasonal or annual efficiency of a central air conditioner or air conditioning heat pump. It takes into account the variations in temperature that can occur within a season and is the average number of Btu of cooling delivered for every watt- ...

A device that cools air by removing moisture from it.