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

A space heating device that burns pellets; are more efficient, clean burning, and easier to operate relative to conventional cord wood burning appliances.

A way of joining photovoltaic cells by connecting positive leads to negative leads; such a configuration increases the voltage.

Energy supplied during periods of relatively high system demands as specified by the supplier.

The ability of a building construction assembly (partition, wall, floor, etc.) to resist the passage of fire. The rating is expressed in hours.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

The period of low energy demand, as opposed to maximum, or peak, demand.

A device consisting of two dissimilar conductors with their ends connected together. When the two junctions are at different temperatures, a small voltage is generated.

The transfer of heat through a material by the transfer of kinetic energy from particle to particle; the flow of heat between two materials of different temperatures that are in direct physical contact.

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

The concept of capturing and converting the energy available in the motion of ocean waves to energy.

A unit of rate of operation. Electrical Hp: a measure of time rate of mechanical energy output; usually applied to electric motors as the maximum output; 1 electrical Hp is equal to 0.746 kilowatts or 2,545 Btu per hour. Shaft Hp: a measure of the actual ...

A device that removes contaminants, by mechanical filtration, from the fresh air stream before the air enters the living space. Filters can be installed as part of a heating/cooling system through which air flows for the purpose of removing particulates b ...

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

The transfer of heat through matter or space by means of electromagnetic waves.

A water heater that heats water before it is directly distributed for end use as required; a demand water heater.

The force that pulls a wind turbine blade, as opposed to drag.

A type of motor that has a rotor with electrical windings connected through slip rings to the external power circuit. An external resistance controller in the rotor circuit allows the performance of the motor to be tailored to the needs of the system and ...

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

The ratio of a photovoltaic cell's actual power to its power if both current and voltage were at their maxima. A key characteristic in evaluating cell performance.