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 ...

One millionth of a meter (10-6 m).

A system of astronomical time in which the sun crosses the true north-south meridian at 12 noon, and which differs from local time according to longitude, time zone, and equation of time.

The number of cycles through which an alternating current passes per second; in the U.S. the standard for electricity generation is 60 cycles per second (60 Hertz).

Infrared or radiant heat.

An electrical device that resists electric current flow.

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

Standardized codes used to classify businesses by type of activity they engage in.

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

A utility owned by stockholders or other investors; sometimes referred to as a private utility, in contrast to a public utility that is owned by a government agency or cooperative.

A particle of light that acts as an individual unit of energy.

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

In reference to solar photovoltaic devices, the growth of one crystal on the surface of another crystal. The growth of the deposited crystal is oriented by the lattice structure of the original crystal.

A load management objective that moves loads from on-peak periods to off-peak periods.

The process of burning; the oxidation of a material by applying heat, which unites oxygen with a material or fuel.

The temperature of the air as measured by a standard thermometer.

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 ...

A building with more than 50 percent of its floorspace used for commercial activities, which include stores, offices, schools, churches, libraries, museums, health care facilities, warehouses, and government buildings except those on military bases.

Ethyl alcohol (C2H5OH)

An unregulated subsidiary of an electric utility that is allowed to generate and sell wholesale power as an independent energy producer, and is exempt from the Public Utility Holding Company Act of 1935.