An open-loop solar heating system in which the heat transfer fluid from the collector loop and the piping drain into a drain whenever freezing conditions occur.

The outer casing of a window that sits in a designated opening of a structure and holds the window panes in place.

A self-contained toilet that use the process of aerobic decomposition (composting) to break down feces into humus and odorless gases.

Sensible and latent heat contained in combustion gases and vapor emitted to the atmosphere.

An exterior door that protects the primary door.

A type of heating system in which the heat transfer fluid circulates from the heating component to a heat exchanger that is immersed in a heat storage media, passing its heat to the storage media without physically contacting it.

The flow of electrical energy (electricity) in a conductor, measured in amperes.

Water heated for residential washing, bathing, etc.

Natural gas (methane) that has been compressed to a higher pressure gaseous state by a compressor; used in CNG vehicles.

A tubular material used to encase and protect one or more electrical conductors.

The nominal voltage for which a conductor or electrical appliance is designed; the reference voltage for identification and not necessarily the precise voltage at which it operates.

The ratio of available energy per pound; usually used to compare storage batteries.

The push or pull that alters the motion of a moving body or moves a stationairy body; the unit of force is the dyne or poundal; force is equal to mass time velocity divided by time.

A value that describes the ability of a material to conduct heat. The number of Btu that flow through 1 square foot of material, in one hour. It is the reciprocal of the R-Value (U-Value = 1/R-Value).

A means to increase the thermal efficiency of a steam electric generating system by increasing temperatures and interposing a device, such as a gas turbine, between the heat source and the conventional steam-turbine generator to convert some of the additi ...

The force per unit area acting on the surface of a solid boundary parallel to the flow.

An investment in a power plant or demand side management measures or programs, that become uneconomical due to increased competition in the electric power market. For example, an electric power plant may produce power that is more costly than what the mar ...

In reference to a wind turbine, a condition when the rotor stops turning.

Infrared or radiant heat.

A family of chemicals composed primarily of carbon, hydrogen, chlorine, and fluorine whose principal applications are as refrigerants and industrial cleansers and whose principal drawback is the tendency to destroy the Earth's protective ozone layer.