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

A device that cuts off the flow of hot or cold air to or from a room as controlled by a thermostat.

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

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

A device that cools air by removing moisture from it.

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.

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

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.

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.

As defined by the Energy Security Act (PL 96-294) of 1980, "any organic matter which is available on a renewable basis, including agricultural crops and agricultural wastes and residues, wood and wood wastes and residues, animal wastes, municipal wastes, ...

The maximum load that a motor is capable of supplying.

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

A program of the U.S. Department of Energy (DOE) that implements energy legislation and presidential directives. FEMP provides project financing, technical guidance and assistance, coordination and reporting, and new initiatives for the federal government ...

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).

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 ...

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

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 ...

Energy systems supply individual, or small-groups, of energy loads.