This is the voltage-ampere requirement of a device designed to convert electric energy to a non-electrical form.

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.

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

see Air-Source Heat Pump.

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

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

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.

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.

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

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

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- ...

Referring to alterations in the environment due to the presence or activities of humans.

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

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

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

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.