The angle that a solar collector is positioned from horizontal.

The process of removing moisture; involves evaporation.

The physical process by which a liquid or solid is transformed into the gaseous state. For this process a mechanical device uses the outside air's heat to evaporate water that is held by pads inside the cooler. The heat is drawn out of the air through thi ...

The fluid, liquid (water or water/antifreeze solution) or air, used to absorb solar energy and transfer it for direct use, indirect heating of interior air or domestic water, and/or to a heat storage medium.

The lowest wind speed at which a wind turbine begins producing useable power.

In reference to solar thermal collectors, the condition where the heat transfer fluid is flowing through the collector loop under normal operating conditions.

The push or pull that alters the motion of a moving body or moves a stationairy body; the unit of force is the dyne or poundal; force is equal to mass time velocity divided by time.

A type of house that has massive amounts of insulation, airtight construction, and controlled ventilation without sacrificing comfort, health, or aesthetics.

One pound of water in vapor phase; is NOT steam pressure, which is expressed as pounds per square inch (psi).

A slightly sloped roof, usually with a tar and gravel cover. Most commercial buildings use this kind of roof.

Pounds/force per square inch gauge.

A self-contained toilet that use the process of aerobic decomposition (composting) to break down feces into humus and odorless gases.

A building heating, ventilation, and/or air conditioning system that distributes conditioned air to individual zones or rooms.

The loss in static pressure of a fluid (liquid or gas) in a system due to friction from obstructions in pipes, from valves, fittings, regulators, burners, etc, or by a breech or rupture of the system. Pressurization Testing

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

A term for the process of transmitting electricity over transmission lines not owned by the supplier of the electricity to a retail customer of the supplier. With retail wheeling, an electricity consumer can secure their own supply of electricity from a b ...

An energy band in a semiconductor in which electrons can move freely in a solid, producing a net transport of charge.

The amount of heated air, or heating capacity, to be supplied by a heating system; usually the maximum amount to be delivered based on a specified number of heating degree days or design outside temperature.

Metal, usually galvanized sheet metal, used to provide protection against infiltration of precipitation into a roof or exterior wall; usually placed around roof penetrations such as chimneys.

A device that removes airborne particles from breathable air. Negative ions are produced and give up their negative charge to the particles. These new negative particles are then attracted to the positive particles surrounding them. This accumulation proc ...