A unit of electrical force equal to that amount of electromotive force that will cause a steady current of one ampere to flow through a resistance of one ohm.

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.

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

see Air-Source Heat Pump.

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

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

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 ...

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

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

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

The use of direct, diffuse, or reflected sunlight to provide supplemental lighting for building interiors.

The control of the quality, quantity, and temperature-humidity of the air in an interior space.

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 ...

An insulation product composed of loose fibers or fiber pellets that are blown into building cavities or attics using special pneumatic equipment.

A structural, load-carrying building member with an open web system that supports floors and roofs utilizing wood or specific steels and is designed as a simple span member.

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

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

The process or technologies for producing energy by harnessing the temperature differences (thermal gradients) between ocean surface waters and that of ocean depths. Warm surface water is pumped through an evaporator containing a working fluid in a closed ...