The angle that a solar collector is positioned from horizontal.

A power plant that generates power by combusting a fuel.

A plastic foam insulation product, pressed or extruded into board-like forms, used as sheathing and insulation for interior basement or crawl space walls or beneath a basement slab; can also be used for exterior applications inside or outside foundations, ...

A chemical element that can be used as a fuel since it has a very high energy content.

Methyl Tertiary Butyl Ether (MTBE) is an ether compound used as a gasoline blending component to raise the oxygen content of gasoline. MTBE is made by combining isobutylene (from various refining and chemical processes) and methanol (usually made from nat ...

An electric current taking a shorter or different path than intended.

A heat source, such as a space heater, used to provide more heat than that provided by a primary heating source.

The power required to energize the magnetic field of a generator.

The flow rate in these systems is 1/8 to 1/5 the rate of most solar water heating systems. The low-flow systems take advantage of stratification in the storage tank and theoretically allows for the use of smaller diameter piping to and from the collector ...

A measure of the moisture content of air; may be expressed as absolute, mixing ratio, saturation deficit, relative, or specific.

Legal documents that regulate construction to protect the health, safety, and welfare of people. Codes establish minimum standards but do not guarantee efficiency or quality.

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 ...

The solar power density incident on a surface of stated area and orientation, usually expressed as Watts per square meter or Btu per square foot per hour.

One horsepower provided over one hour; equal to 0.745 kilowatt-hour or 2,545 Btu.

A power plant that produces electricity by the force of water falling through a hydro turbine that spins a generator.

A measure of the probability that a system demand will exceed capacity during a given period; often expressed as the estimated number of days over a long period, frequently 10 years or the life of the system.

A type of heating system that provides heat from the resistance of an electrical current flowing through a conductor.

The demand of a consumer of electricity at the time of a power supplier's peak system demand.

This type of heat pump is known as an air-to air system.

A curve that displays load values on the horizontal axis in descending order of magnitude against the percent of time (on the vertical axis) that the load values are exceeded.