The processes that a work input/output system undergoes and in which the initial and final states are identical.

A material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy. These films are retrofitted on existing windows.

A type of motor designed to operate precisely at the synchronous speed with no slip in the full-load speeds (rpm).

An idealized process in which a working fluid (water, air, ammonia, etc) successively changes its state (from a liquid to a gas and back to a liquid) for the purpose of producing useful work or energy, or transferring energy.

A unit or measure of electricity supply or consumption of 1,000 Watts over the period of one hour; equivalent to 3,412 Btu.

A form of thermal energy resulting from combustion, chemical reaction, friction, or movement of electricity. As a thermodynamic condition, heat, at a constant pressure, is equal to internal or intrinsic energy plus pressure times volume.

Any gaseous, liquid, or solid fuel used for indoor space heating.

A room heat delivery (or exchanger) component of a hydronic (hot water or steam) heating system; hot water or steam is delivered to it by natural convection or by a pump from a boiler.

The energy developed through the use of heat energy.

The quantity of heat necessary to raise the temperature of a specific mass of a substance by one degree.

A statement of the electric rate(s), terms, and conditions for electricity sale or supply.

The space within a building or structure that is normally occupied by people, and that may be conditioned (heated, cooled and/or ventilated).

A measure of the efficiency of an appliance's energy efficiency.

The standard method for calculating residential cooling loads developed by the Air-Conditioning and Refrigeration Institute (ARI) and the Air Conditioning Contractors of America (ACCA) based largely on the American Society of Heating, Refrigeration, and A ...

The structural elements (walls, roof, floor, foundation) of a building that encloses conditioned space; the building shell.

The amount of solar radiation striking a surface per unit of time and area.

All the components of the appliance used to condition interior air of a building.

A device that releases pressure within a radiator when the pressure inside exceeds the operating limits of the vent.

The wheeling of electric power in amounts and at prices that generally have been negotiated in longterm contracts between the generator and a distributor or very large consumer of power.

The flow of heat from one area to another by conduction, convection, and/or radiation. Heat flows naturally from a warmer to a cooler material or space.