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• Electric acceleration
  ...lerate the exit velocity so far. Different fuel mixtures produce different energy, cryogenic hydrogen/oxygen seams to have the greatest. ...s density is too high the charges will "jam up" the engine causing reduced efficiency. Heavy gasses like Xenon and Krypton are a way to increase gas mass without
  5 KB (841 words) - 04:02, 21 January 2009
• Greenhouse
  ...ter, depending on the plant species. This makes natural lighting far more energy efficient. ...tely after harvest, the space does not sit idle. This improves production efficiency. Choice of crops in rotation, as well as staggered plantings of the same c
  21 KB (3,373 words) - 04:02, 21 January 2009
• Hydrogen
  ...el at greater [[velocities]] at a given [[temperature]] and the propellant efficiency of a rocket known as [[specific impulse]] depends on the [[exhaust velocity ...allenges to using such a fuel, it has the potential to produce vastly more energy than the H₂ + O₂ burn.
  4 KB (671 words) - 04:02, 21 January 2009
• ISRU solar cells
  # An anti-reflective layer significantly increases efficiency. Amorphous silicon yields lower efficiency cells (8% versus 14%) but vapor deposition techniques can be used during ma
  4 KB (579 words) - 04:02, 21 January 2009
• Model 3 A Radiation Cooled Greenhouse
  e is the efficiency of the collector<br> ...use they operate in a warmer environment, collect heat with better overall efficiency, and can be made with lower emissivity materials such as metal and fibergla
  9 KB (1,591 words) - 04:02, 21 January 2009
• Pure electric propulsion
  ...specific impulse]] while pure electric propulsion implies a greater energy efficiency for a given specific impulse as a consequence of reduced entropy in the [[r
  721 bytes (115 words) - 04:02, 21 January 2009
• Radioisotope thermoelectric generator
  ...hermoelectric device that converts thermal energy directly into electrical energy using the Seebeck effect. It is made of two kinds of metal (or semiconducto ...plunging into the Tonga trench in the Pacific Ocean. The US Department of Energy has conducted seawater tests and determined that the graphite casing, which
  10 KB (1,596 words) - 04:43, 24 August 2010
• Solar panels
  ...Shaped_Fixed_Array.jpg|thumb|A Solar Panel Array Shaped to Catch the Most Energy During the Day]] ...ll developed technique, with extensive industrial experience. The highest efficiency crystalline PV cells are produced using this method. However, it produces
  14 KB (2,351 words) - 04:02, 21 January 2009
• The Fundamentals of space Travel
  ...c propulsions. Electric propulsion trades [[energy efficiency]] for [[fuel efficiency]]. A more fundamental problem then producing a better electric engine is pr
  10 KB (1,764 words) - 04:02, 21 January 2009
• Thermodynamic cycle
  ...es and return to the same state. They are used as a means to transfer heat energy into work. Some common thermodynamic cycles are the [[Carnot Cycle]], the [ ...easily be built on a small scale while maintaining performance in terms of efficiency cost and power production. A cheaper alternative for small scale power prod
  4 KB (711 words) - 04:02, 21 January 2009
• Water electrolysis
  ...is also high-temperature electrolysis (100 to 850 °C) which has a higher efficiency. ...d atoms from recombining, plus an additional 0.47V to overcome the binding energy of the water molecules. This is 1.70V. Electrical resistance makes it worth
  2 KB (344 words) - 04:02, 21 January 2009