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[citation needed] Some natural gas-driven home fuel cells can generate eight times more energy per year than the same-sized solar installation, even in the best solar locations [citation needed]. For example, a 5 kW home fuel cell produces about 80 MWh of annual combined electricity and heat, compared to approximately 10MWh generated by a 5 kW ...
They are often much larger than fossil fuel power plants, needing areas of land up to 10 times greater than coal or gas to produce equivalent energy amounts. [252] More than 2000 renewable energy facilities are built, and more are under construction, in areas of environmental importance and threaten the habitats of plant and animal species ...
An advantage of this is the engine can be run using a lean fuel-air mixture. Such a mixture is one in which the amount of fuel is less than the theoretical, stoichiometric or chemically ideal amount needed for combustion with a given amount of air. Fuel economy is then greater and the combustion reaction is more complete.
The orbital phasing can be problematic; once rendezvous has been achieved, low delta-v return windows can be fairly far apart (more than a year, often many years), depending on the body. In general, bodies that are much further away or closer to the Sun than Earth, have more frequent windows for travel, but usually require larger delta-vs.
The landmark rule from South Coast AQMD would phase out more than 1 million natural gas-powered appliances, including those that heat swimming pools and hot tubs, and require them to be replaced ...
The core never reaches high enough temperature for further fusion burning of heavier elements than carbon. [13] Stars of more than 12 solar masses start carbon burning in a non-degenerate core, [14] and after carbon exhaustion proceed with the neon-burning process once contraction of the inert (O, Ne, Na, Mg) core raises the temperature ...
It has nine edges, one edge for each of the pairings of a house with a utility, or more abstractly one edge for each pair of a vertex in one subset and a vertex in the other subset. Planar graphs are the graphs that can be drawn without crossings in the plane, and if such a drawing could be found, it would solve the three utilities puzzle.
On August 3, 2010, Blizzard announced that StarCraft II sold more than one million units worldwide within one day of its release. After two days, when Blizzard began selling the game as a digital download on its website, approximately 500,000 additional units of the game were sold, bringing the total up to 1.5 million worldwide and making it ...