ENERC wrote:Some figures for a cruise liner with data collected on board:
- 4000 customers
- 1000 crew (sailors, catering, animation, laundry, maintenance, ... in 24 / 24)
- 50 tons of fuel oil / day at berth
- 150 tons of fuel / day cruising (24 hours of navigation)
If we look at the dock, 50 tons give about 50 * 10,64 * (40% yield) = 212 MWh, or 42 kWh per day per person.
This is huge compared to 4000 / 365 = 11 kWh per day for an average home. (pools and desalinization surely).
a) Do you have the source of these numbers?
b) We must not compare the luxury (liner) and the (more or less) useful (cargo, car, house ...) ... and we must compare it all in primary energy (the fuel is one, not electricity).
What are the 4000 kWh that you retain for the average home? If it's electricity, as I suppose, it's not good ...
In short, we should compare these 42 kWh consumption of a luxurious hotel (ie something that provides the same benefits: sauna, spa, swimming pool, large kitchen ...) ... the difference will certainly be much less important than with a standard home ...
ENERC wrote:The liner has a cruising speed of about 21 knots (40 km / h). It travels about 1000 km per day.
The consumption of displacement per passenger is therefore:
(150-50) * 1000 / 5000 / 1000 * 100 = 2 liters to 100.
And 3 liters at 100 including consumption at the quay (lighting, air conditioning, kitchens, laundry, desalination of sea water, ...)
Or 3,75 l / 100 excluding crew members.
c) That's it: it's not so polluting that it finally!
We arrive at the same orders of magnitude as the planes (but 40km / h VS 900 km / h ... so a plane is still much better, but there is no spa in an airplane ... )