A motor in which a three phase (or any multiphase) alternating current (i.e. the working current) is supplied to iron-cored coils (or windings) within the stator. As a result, a rotating magnetic field is set up, which induces a magnetizing current in the ...

A unit of pressure for a fluid, commonly used in water pumping and hydropower to express height a pump must lift water, or the distance water falls. Total head accounts for friction head losses, etc.

The process of managing the consumption of energy, generally to optimize available and planned generation resources.

A heating system where heat is supplied (radiated) into a room by means of heated surfaces, such as electric resistance elements, hot water (hydronic) radiators, etc.

A description of how well people in a lighted space can see to do visual tasks and how visually comfortable they feel in that space.

The regular periodic arrangement of atoms or molecules in a crystal of semiconductor material.

The thermodynamic cycle that is an ideal standard for comparing performance of heat-engines, steam power plants, steam turbines, and heat pump systems that use a condensable vapor as the working fluid; efficiency is measured as work done divided by sensib ...

The trapping of light inside a semiconductor material by refracting and reflecting the light at critical angles; trapped light will travel further in the material, greatly increasing the probability of absorption and hence of producing charge carriers.

A company or individual that is not directly regulated as a utility. These entities produce power for their own use and/or sell it to regulated utilities.

A device that captures the heat from the exhaust air from a building and transfers it to the supply/fresh fresh air entering the building to preheat the air and increase overall heating efficiency.

Site planning that accounts for natural solar heating and cooling processes and their relationship to building shape, orientation, and siting.

States that energy cannot be created or destroyed, but only changed from one form to another. First Law efficiency measures the fraction of energy supplied to a device or process that it delivers in its output. Also called the law of conservation of energ ...

The process of the absorption of heat from one location and its transfer to another for rejection or recuperation.

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

Features and vegetation on the outside of or surrounding a building for aesthetics and energy conservation.

A WECS designed to produce electricity.

A wood-burning appliance for space and/or water heating and/or cooking.

The transmission of electricity through power lines.

An electrical inverter that inverts direct current electricity to alternating current electricity, and that uses another alternating current source, such as an electric power transmission and distribution network (grid), for voltage and frequency referenc ...

This designates the resistance of a material to heat conduction. The greater the R-value the larger the number.