A type of combustion heating appliance in which the combustion gases are vented to the outside, either with a fan (forced) or by natural convection.

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.

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 ...

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

The overall rate of heat loss from a building by means of transmission plus infiltration, expressed in Btu per hour, per degree temperature difference between the inside and outside.

A metric unit of energy or work; the energy produced by a force of one Newton operating through a distance of one meter; 1 Joule per second equals 1 Watt or 0.737 foot-pounds; 1 Btu equals 1,055 Joules.

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 ...

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

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

The relationship of a building to true south, as specified by the direction of its longest axis.

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

A type of vertical-axis wind machine that has long, thin blades in the shape of loops connected to the top and bottom of the axle; often called an "eggbeater windmill."

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.

A method for making sheets of polycrystalline silicon in which silicon dendrites are slowly withdrawn from a melt of silicon whereupon a web of silicon forms between the dendrites and solidifies as it rises from the melt and cools.

Energy produced by the internal heat of the earth; geothermal heat sources include: hydrothermal convective systems; pressurized water reservoirs; hot dry rocks; manual gradients; and magma. Geothermal energy can be used directly for heating or to produce ...

Any process that uses solar radiation to produce useful heat.

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

The angular position of the sun at solar noon with respect to the plane of the equator.

A power line for supplying electricity within a specified area.

The interior heat gain due to heat conduction, convection, and radiation from the exterior into the interior, and from occupants and appliances.