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Category Scope

44 Energy Production and Conversion

Includes specific energy conversion systems, e.g., fuel cells; and solar, geothermal, windpower, and waterwave conversion systems; energy storage; and traditional power generators. For technologies related to nuclear energy production see 73 Nuclear Physics. For related information see also 07 Aircraft Propulsion and Power; 20 Spacecraft Propulsion and Power; and 28 Propellants and Fuels.


Energy Production – The production of electricity, combustible fuels, nuclear and thermonuclear fuels, and heating and cooling by renewable resources.

Energy Conversion – The change of a working substance or natural power into a more useable form of energy such as electricity or mechanical motion. NASA Thesaurus, Washington, DC: National Aeronautics and Space Administration.

NASA Interest

Exhaustive Interest : Techniques, equipment, and systems that may provide power or fuel for aircraft, space vehicles, launch vehicles, satellites, orbital stations, extraterrestrial bases.

Selective Interest : Earth based energy production and conversion, energy for transportation, and new developments in energy technology (new sources, high efficiency units, etc.); lightweight, low cost power units with potential for aerospace application.

Negative Interest : Solar, wind, nuclear and hydroelectric power plants for routine commercial applications; coal energy conversion.


Input Subjects of Specific Interest

  • alternative energy sources
  • Brayton cycle turbines (applications)
  • chemical energy conversion devices
  • electric batteries (applications)
  • electric energy conversion devices
  • energy management technology
  • energy production
  • energy storage
  • fuel cells
  • generators (applications)
  • geophysical energy conversion devices
  • hybrid energy conversion devices
  • magnetohydrodynamic (MHD) energy conversion device
  • microwave energy conversion devices
  • microwave energy transmission
  • photovoltaic energy conversion devices
  • silicon cells (applications)
  • solar cells (energy conversion)
  • solar generators
  • solar heating (space applications)
  • solar panels (energy conversion)
  • solar power (space applications)
  • thermionic energy conversion devices
  • thermoelectricity
  • windpower