A system capable of rotating about one axis.

A furnace/combustion chamber in which finely ground fuel is blown in spirals in the combustion chamber to maximize combustion efficiency.

The process of breaking down organic material; reduction of the net energy level and change in physical and chemical composition of organic material.

An air heater in which air is blown over electric resistance heating coils.

The concept of capturing and converting the energy available in the motion of ocean waves to energy.

A unit or measure of electricity supply or consumption of 1,000 Watts over the period of one hour; equivalent to 3,412 Btu.

The arithmetic wind speed over a specified time period and height above the ground (the majority of U.S. National Weather Service anemometers are at 20 feet (6.1 meters).

The coldest months of the year; months where average daily temperatures fall below 65 degrees Fahrenheit creating demand for indoor space heating.

The trapping of light inside a semiconductor material by refracting and reflecting the light at critical angles; trapped light will travel further in the material, greatly increasing the probability of absorption and hence of producing charge carriers.

A registered trademark name for houses built with tires, aluminum cans, and earth.

The wind speed with 50 percent probability of occurring.

The distance between similar points on successive waves.

Standardized weights or volumes for heating fuels.

A material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy. These films are retrofitted on existing windows.

An electrochemical battery that uses lead and lead oxide for electrodes and sulfuric acid for the electrolyte.

This is an independent regulatory agency within the U.S. DOE that has jurisdiction over interstate electricity sales, wholesale electric rates, natural gas pricing, oil pipeline rates, and gas pipeline certification. It also licenses and inspects private, ...

A heat exchanger for recovering heat from flue gases for heating water or air.

The quantity of heat necessary to raise the temperature of a specific mass of a substance by one degree.

A type of motor that has a rotor with electrical windings connected through slip rings to the external power circuit. An external resistance controller in the rotor circuit allows the performance of the motor to be tailored to the needs of the system and ...

A room heat delivery (or exchanger) component of a hydronic (hot water or steam) heating system; hot water or steam is delivered to it by natural convection or by a pump from a boiler.