A tube in which combustion gases from a combustion appliance are vented out of the appliance to the outdoors.

The mean wind speed over a specified period of time.

A non-crystalline semiconductor material that has no long-range order.

These are separate and distinct organizational agencies within the U.S. DOE that market power at federal multipurpose water projects at lowest possible rates to consumers consistent with sound business principles. There are five PMA's: Alaska Power Admini ...

A unit of electrical measurement equal to the product of a volt and an ampere.

A generic term for liquefied and pressurized gas, ordinarily butane, propane, or a mixture of the two, contained in a cylinder for domestic use.

An electricity supplier rate structure in which the per unit price of electricity decreases as the amount of energy increases. Normally only available to very large consumers.

The ratio of solar collector array area to actual land area.

The pressure corresponding to the outlet velocity of a fan; the kinetic energy per unit volume of flowing air.

A total life cycle cost divided into equal amounts.

A method for making sheets of polycrystalline silicon in which silicon dendrites are slowly withdrawn from a melt of silicon whereupon a web of silicon forms between the dendrites and solidifies as it rises from the melt and cools.

The process of moving air (changing) into and out of an interior space either by natural or mechanically induced (forced) means.

A type of municipal solid waste (MSW) incineration facility in which MSW is burned with only minor presorting to remove oversize, hazardous, or explosive materials. Mass burn facilities can be large, with capacities of 3000 tons (2.7 million kg) of MSW pe ...

The factor, when multiplied by the monthly degree-days, that yields the monthly space heating load.

An abbreviation for one thousand cubic feet of natural gas with a heat content of 1,000,000 Btus, or 10 therms.

The ratio of the maximum demand on an electricity generating and distribution system to the total connected load on the system; usually expressed as a percentage.

The amount of BTU's/hour or kW's produced by a heating system from the burning of a fuel.

A solar thermal collector that has an absorber that does not have a glazed covering. Solar swimming pool heater systems usually use unglazed collectors because they circulate relatively large volumes of water through the collector and capture nearly 80 pe ...

Any process that uses solar radiation to produce useful heat.

A naturally occurring radioactive gas found in the U.S. in nearly all types of soil, rock, and water. It can migrate into most buildings. Studies have linked high concentrations of radon to lung cancer.