On Sat, 23 Jul 2011 13:51:02 -0600 Craig <diese...@pisquared.net> wrote:
I made some mistakes, see below: > 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's 78 ounces per revolution. > > Since it runs 102 revolutions/minute, that's 7956 ounces per minute > (which is 62.15625 gallons/minute). So far so good. :-) > At that rate, it's 477,360 gallons/hour. It's 477,360 OUNCES/hour, which is 3729.375 gallons/hour, or 89,505 gallons/day. > 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%. If you change to bunker oil at 140,000 BTU/gallon, the efficiency is only 53.12%, still high. > The efficiency seems high, but the fuel consumption seems astronomical. > Where do they 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 3729.375 gallons/hour, the total fuel consumption is 372,937.5 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. The fuel tank would then be 49858 cubic feet, a cube 36.81 feet on a side. Boy, one little mistake will throw the whole thing off! Reminds me of my high school calculus teacher who had us work out test problems on the front sides of our pages of paper and then fold the test in half vertically so the back side of the last page was showing and then write our answers there. That was all he looked at when grading. 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
