A type of heat pump that uses the ground, ground water, or ponds as a heat source and heat sink, rather than outside air. Ground or water temperatures are more constant and are warmer in winter and cooler in summer than air temperatures. Geothermal heat p ...

A device used to control temperatures; used to control the operation of heating and cooling devices by turning the device on or off when a specified temperature is reached.

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

A type of heating system where heat, resulting when electric current flows through an "element" or conductor, such as Nichrome, which has a high resistance, is radiated to a room.

The energy developed through the use of heat energy.

The amount of energy derived from an electrical source per unit quantity of electricity passing through the source.2. Electrical potential; voltage.

The amount of heat produced from the complete combustion of a unit of fuel. The higher (or gross) heating value is that when all products of combustion are cooled to the pre-combustion temperature, water vapor formed during combustion is condensed, and ne ...

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

The change in heat content that occurs with a change in phase and without change in temperature.

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

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

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

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

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

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

A gas or liquid used to move heat energy from one place to another; a refrigerant.

Alternating current in which three separate pulses are present, identical in frequency and voltage, but separated 120 degrees in phase.

The process of breaking down organic material; reduction of the net energy level and change in physical and chemical composition of organic material.