On Wed, 20 Jul 2011 23:16:19 -0500 OK Don <okd...@gmail.com> wrote: > http://gizmodo.com/5822447/the-worlds-largest-diesel-engine-powers-way-more-than-the-worlds-largest-container-ship
It's the same one posted back in 2003, but it's nice to see it again, and to see the finished product being removed from the assembly room. The article says, "it ... injects 6.5 ounces of diesel in every piston for every cycle." Since it's a two-stroke engine, that's 6.5 ounces per piston per revolution. Since it has 12 cylinders, that' 78 ounces per revolution. Since it runs 102 revolutions/minute, that's 7956 ounces per minute (which is 62.15625 gallons/minute). At that rate, it's 477,360 gallons/hour. The article says it produces 109,000 HP, which is 3.597e+09 ft-lb/min. That is also 4,622,387.7 BTU/min. Since one gallon of diesel has about 120,000 BTU, 62.15625 gallons of diesel has about 7,458,750 BTU. Since the input is 7,458,750 BTU/min and the output is 4,622,387.7 BTU/min, the efficiency is 61.97%. The efficiency seems high, but the fuel consumption seems astronomical. Where do the put all the fuel? At 31 knots, a trip of 3100 nautical miles will take 100 hours, for a total fuel consumption of 47,736,000 gallons. At 7.48 gallons per cubic foot, the fuel tank would have to be 6,381,375 cubic feet. If it were a cube, that would be 185.48 feet on a side. Well, OK, for a ship that's 1300 feet long, that's not too much.... But still! Craig _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
