To disconnect a transmission and/or distribution line; a power line that is not carrying a current; to open a circuit.

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.

A term used for the transparent or translucent material in a window. This material (i.e. glass, plastic films, coated glass) is used for admitting solar energy and light through windows.

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

A combustion heating appliance that vents the combustion by-products directly into the heated space. The latest models have oxygen-sensors that shut off the unit when the oxygen level in the room falls below a safe level.

The grilled opening into a room by which the amount of warm air from a furnace can be directed or controlled; may include a damper.

A measure of the heating requirements of a building expressed in Btu per degree-day.

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

A method of preventing oxidation of the exposed metal in structures by imposing between the structure and the ground a small electrical voltage.

A device that cools air by removing moisture from it.

In reference to solar energy systems, the angle that a solar collector is positioned above horizontal.

The maximum load that a motor is capable of supplying.

Consist of three main layers. The top layer is near ambient and has low salt content. The bottom layer is hot, typically 160 F to 212 F (71 C to 100 C), and is very salty. The important gradient zone separates these zones. The gradient zone acts as a tran ...

An interior wall made of water filled containers for absorbing and storing solar energy.

Discharging a battery to 20 percent or less of its full charge capacity.

A popular term for "non-conventional" transportation fuels derived from natural gas (propane, compressed natural gas, methanol, etc.) or biomass materials (ethanol, methanol).

A slender threadlike spike of pure crystalline material, such as silicon.

A standard unit of electrical power equal to one thousand watts, or to the energy consumption at a rate of 1000 Joules per second.

The transformation on a compound or material into one or more substances by heat alone (without oxidation). Often called destructive distillation. Pyrolysis of biomass is the thermal degradation of the material in the absence of reacting gases, and occus ...

The weight of a material per unit of volume compared to the weight of the same volume of water.