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Isn't it cheaper to refuel than to have to lug enough fuel around purely by the weight of it and the additional energy required? Plus your crew may need some d
by cyberpunk 2y ago
Isn't it cheaper to refuel than to have to lug enough fuel around purely by the weight of it and the additional energy required?
Plus your crew may need some downtime sometimes.
- bobthepanda 2y agoNo, because ports have docking fees since port space is at a premium.
- cyberpunk 2y agoI find it hard to believe the cost of docking for a few hours to refuel is > the cost of carrying and moving 2x the weight of fuel you would need otherwise. Do you have some idea of the costs?
- ponector 2y agoHow much heavy fuel does a suezmax vessel carry? Less than 1% of the full deadweight, I assume. Costs of carrying fuel are negligible.
- bobthepanda 2y agoShips don’t use all that much fuel. A Panamax ship has a capacity of 2 million gallons of fuel and that would be ~2,600 tons. The total tonnage of a Panamax ship is ~52,000 tons. Most cargo shipping saves fuel by just running slower.
- no_wizard 2y agoThis makes me wonder if the Navy nuclear reactors used on their ships could be used on shipping vessels to lower the cost of shipping in some manner. Perhaps a sky high dream but wouldn’t this effectively given ships unlimited fuel?
- wbl 2y agoWe tried it but ports wouldn't let the ships dock and they were too small. Now it might be easier.
- nradov 2y agoNope. The safety and security issues make nuclear powered merchant vessels a non starter (except for a few niche cases like icebreakers that operate in Russian territorial waters). Few nations are willing to allow an accident or terrorist attack to sink a reactor in one of their harbors. Plus you can't hire qualified nuclear engineers for low wages. A more realistic option would be to build more large reactors on land, then use the heat and power to manufacture synthetic liquid fuel to burn in ship engines. Or to charge batteries for short range vessels.
- no_wizard 2y agoI wonder if there is a nuclear reactor design nowadays that offsets at least some of these fears. I sometimes wonder, though admittedly as a non expert, if some of these fears that linger around nuclear power sources are behind the times. For example, I saw a demonstration of a nuclear powered device (don’t want to say reactor per say) that was taped for a documentary I saw on PBS, it was the size of a water heater or so and had a self protection system in case of something like a rupture, that at least during the demonstration stopped it cold in its tracks preventing meltdown and made any recovered materials from tampering worthless. It was in the testing phase though, and this was at least 5 years ago. My understanding is they wanted it to power critical infrastructure onsite like hospitals but feasibly it could power a home if I recall correctly or possibly a couple homes. Another thing I read about was using some form of partially enriched uranium as energy source for heating homes and water heating. It won’t power one but it’s not (and can’t possibly be if I recall correctly) weapons grade by any stretch of the imagination Maybe we should as a society look a little closer at smaller reactors. Hard to say, I’m no expert
- nradov 2y agoYou might be thinking of radioisotope thermoelectric generators. Those can be useful for generating relatively small amounts of electric power in isolated areas. But they're very inefficient and can't scale up to the level required to propel large ships. The risk of contamination from a sinking would still remain. So not a realistic solution.
- rvba 2y agoYou should also count that in order to refuel the ship needs to take a longer route
- Scoundreller 2y agoThat’s kinda a thing for aviation: see “intermediate stop operations”. Limiting range also lets you use smaller craft with things like smaller fuel tanks. Iceland does quite a business on this sitting between euro and American destinations. Greenland might get into this too. Also probably gets some crews at home each night flying the leg back instead of needing to stay on the mainland for a day/night before doing a later return leg.
- amelius 2y agoHow does the fuel get to Iceland?
- ivan_gammel 2y agoClosest supplier can be Norway. A bit of science fiction maybe, but they could use geothermal and wind energy to produce hydrogen.
- hansvm 2y agoThe incremental cost of a pound of fuel is a rounding error in shipping. You might factor it in, but it'd be very far down the list of priorities. Interestingly, cars have similar economics. Details vary quite a bit, but every 100lb (nearly two full tanks of gas for me) makes you 1% less efficient. It only really matters if you have driving habits that tend to burn that excess energy somewhere, like rolling in hot to a stop light and hitting your brakes rather than anticipating the light cycle and coasting in.
- LtWorf 2y agoYou're perfectly describing swedish drivers. They seem unable to comprehend that the red light 50 meters ahead will soon be their problem.