25 Feb '14, 8pm

One Giant Cargo Ship Emits As Much As 50 MILLION Cars - #environment

"A car driven 9,000 miles a year emits 3.5 ounces of sulfur oxides--while the engine in a large cargo ship produces 5,500 tons." OK, 5,500 metric tons per year, per large cargo ship, with 280 days of operation annually (noted at the end of the article). Simple math says that's 0.014 metric tons per minute, equivalent to 13.6 kilograms or 30.1 pounds. Even if you assumed that the exhaust gas was cool, the specific volume of sulphur dioxide is 0.368 m3/kg at 1.013 bar and 21C, so that'd be a volume of five cubic meters of sulphur dioxide alone in the exhaust gas, every single second the ship was moving. That's over 1% of the thrust generated by a Pratt & Whitney PW4000 high bypass turbofan such as you'd find on a 747 (1179 kg/sec http://paulcegelski.com/HowJetEngine.htm) -- and that's just the sulphur dioxide volume at room temperature alone. Use a realistic temperature and ...

Full article: http://www.greencarreports.com/news/1020063_pollution-per...

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