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This idea is very similar to one I posted called ch&p buses. Except for ferries.
The ferry has a huge tank full of water that is heated by engine exhaust gases.
Once the water is nice and hot it is pumped into port to feed a district heating system or provide low grade heat to industries located
near to the port.
I think this might be more efficient than the bus, as don't boats use less power per tonne/kilometer? So wouldn't this mean a smaller fraction of the total mass of the boat would be needed to hold the water than with the bus?
The bus version
ch_26p_20bus
Original Idea [humanzee, Jul 03 2008]
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I though this idea was to use waste heat to heat the water under the ferry therefore aid motion . |
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This process is pretty baked on an industrial scale, its called "Cogeneration". But I've never seen it applied to vehicles. |
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For a bus, the extra fuel required to accelerate the huge mass of water would probably negate the gains. But many ships already require carrying ballast water, so if the hot water tank doubles as ballast it might work. |
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i wonder if freighters/tankers could use this trick to heat their ballast to the point at which it becomes inhospitable to life. that way, when they dump, the water will be clear of foreign organisms. free boiled water... |
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What about the poor fish? |
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//What about the poor fish//
Tasty pre-poached seafood. |
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//water that is heated by engine exhaust gases// |
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Erm, large marine engines are cooled by pumping seawater through them, then dumping the seawater back overboard. Keeping that heated water would be easy to do (and already baked somewhere, I thought), so this is a good concept. |
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But getting heat out of the exhaust gasses is a whole 'nother heat-exchanger of fish. Still, it could be done, and would add to the engine-water's heat. |
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(I've often wondered why those fishermen on _Deadliest_Catch_ don't use the hot water from the engines to melt the Bering Sea ice off their crab boats.) |
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