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 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 production of electrical current from light.

To reduce or avoid the consumption of a resource or commodity.

An engine in which fuel is burned (or heat is applied) to the outside of a cylinder; a Stirling engine.

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).

Major energy consuming sectors of the economy. The Commercial Sector includes commercial buildings and private companies. The Industrial Sector includes manufacturers and processors. The Residential Sector includes private homes. The Transportation Sector ...

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

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

A heat exchanger that transfers the heat contained in a liquid heat transfer fluid to air.

A class of energy producer that produces both heat and electricity from a single fuel.

In reference to wind energy, for any given instant, the power available in the wind is proportional to the cube of the wind velocity; when wind speed doubles, the power availability increases eight times.

The abrupt and large increase in electrical conductivity exhibited by some metals as the temperature approaches absolute zero.

A solar photovoltaic product that generally consists of groups of PV cells electrically connected together to produce a specified power output under standard test conditions, mounted on a substrate, sealed with an encapsulant, and covered with a protectiv ...

In refrigeration, an evaporating temperature of 5 degrees Fahrenheit (F), a condensing temperature of 86 degrees F., liquid temperature before expansion of 77 degrees F., and suction temperature of 12 degrees F.

Transmit high-voltage electricity from the transformer to the electric distribution system.

A turbine that generates power from the combustion of a fuel.

The ratio of the electric power produced by a photovoltaic device to the power of the sunlight incident on the device.

A type of photovoltaic device in which the electricity induced in the cell is used immediately within the cell to produce a chemical, such as hydrogen, which can then be withdrawn for use.

Turbines in which the axis of the rotor's rotation is parallel to the wind stream and the ground.