The heat-transfer (exchanger) component of a heatpump, located outdoors, from which heat is collected in the heating mode, or expelled in the cooling mode.

The angle at which a solar collector or module is set to face the sun relative to a horizontal position. The tilt angle can be set or adjusted to maximize seasonal or annual energy collection.

Fuels that cannot be easily made or "renewed," such as oil, natural gas, and coal.

A device used to transfer heat from a fluid (liquid or gas) to another fluid where the two fluids are physically separated.

A power source/generator that operates independently of or is not connected to an electric transmission and distribution network; used to meet a load(s) physically close to the generator.

The average power output of a wind energy conversion system at a given mean wind speed based on a Raleigh frequency distribution.

A popular term used to describe the increase in average global temperatures due to the greenhouse effect.

A unit of electricity consumption of one Watt over the period of one hour.

A term applied to warm-air heating systems that deliver heated air to rooms by means of registers or baseboards located along exterior walls.

A machine for converting mechanical energy into electrical energy by magneto-electric induction; may be used as a motor.

Energy available from the movement of the wind across a landscape caused by the heating of the atmosphere, earth, and oceans by the sun.

The amount of kinetic energy gained by an electron when accelerated through an electric potential difference of 1 Volt; equivalent to 1.603 x 10

A device for measuring power consumption.

A device that can be set to automatically turn appliances (lights) off and on at set times.

A structure or media from which heat can be absorbed or extracted.

As a component of a heating or cooling appliance, rows of tubing or pipe with fins attached through which a heat transfer fluid is circulated and to deliver heat or cooling energy to a building.

SMES technology uses the superconducting characteristics of low-temperature materials to produce intense magnetic fields to store energy. SMES has been proposed as a storage option to support large-scale use of photovoltaics and wind as a means to smooth ...

This law states that no device can completely and continuously transform all of the energy supplied to it into useful energy.

A measure of the percent of moisture actually in the air compared with what would be in it if it were fully saturated at that temperature. When the air is fully saturated, its relative humidity is 100 percent.

The loss of heat as the water circulates through a water heater tank and inlet and outlet pipes.