An inverter that operates independent of or is not connected to an electric transmission and distribution network.

A device used to protect the user of any electrical system or appliance from shock.

When the temperature of the hydrothermal liquids is over 350 F (177 C), flash-steam technology is generally employed. In these systems, most of the liquid is flashed to steam. The steam is separated from the remaining liquid and used to drive a turbine ge ...

A term used to describe heat energy lost from a water heater tank.

The use of two or more different fuels (e.g. wood and coal) simultaneously in the same combustion chamber of a power plant.

A container that holds rock used as the thermal mass to store solar energy in a solar heating system.

The process by which a power plant, apparatus, or building is approved for operation based on observed or measured operation that meets design specifications.

The interior space of a building that is heated or cooled.

The U.S. Government's 12-month financial year, from October to September, of the following calender year; e.g.: FY 1998 extends from Oct. 1, 1997 to Sept. 30, 1988.

A condition that can occur in a solar collector if the working fluid does not circulate when sun is shining on the collector.

A measure of a fuel's (liquid) ease of self-ignition.

The measure of overall efficiency for a variety of appliances. For water heaters, the energy factor is based on three factors: 1) the recovery efficiency, or how efficiently the heat from the energy source is transferred to the water; 2) standby losses, o ...

A comprehensive legislative package that mandates and encourages energy efficiency standards, alternative fuel use, and the development of renewable energy technologies. Public Law 102-486, October 24th, 1992. Also authorized the Federal Energy Regulatory ...

The physical measure of the subjective sensation of brightness; measured in lumens.

A type of solar thermal collector that has tubes (pipes) that the heat transfer fluid flows through that are connected to a flat absorber plate.

A form of solar concentrating collector that does not track the sun.

The torque at the bottom of a speed (rpm) versus torque curve. The torque developed by the motor is a percentage of the full-load or rated torque. At this torque the speed, the rotational speed of the motor as a percentage of synchronous speed is zero. Th ...

An air conditioning system that comes in two to five pieces: one piece contains the compressor, condenser, and a fan; the others have an evaporator and a fan. The condenser, installed outside the house, connects to several evaporators, one in each room to ...

An energy system in which the fuel production equipment is in close proximity, or connected to, the fuel using equipment.

An instrument for measuring relative humidity by means of wet and dry-bulb temperatures.