apes
active solar energy
solar energy to heat a fluid -- either liquid or air -- and then transfer the solar heat directly to the interior space or to a storage system for later use.
ground source heat pump
a heating/cooling system for buildings that uses a type of heat pump to transfer heat to or from the ground
photovoltaic solar cell
an electronic device that converts the energy of light directly into electricity by the photovoltaic effect
fuel cell
a cell producing an electric current directly from a chemical reaction.
wind turbine
a turbine having a large paned wheel rotated by the wind to generate electricity.
electrolysis
chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
geothermal energy
the thermal energy in the Earth's crust which originates from the formation of the planet and from radioactive decay of materials