Breakthrough quick ship. Economical aspects
Breakthrough quick ship.
Economical aspects
Author: David
Judbarovsk, systems engineering, principle inventor, retired
Abstract
Extremely quick
& cheap sea transport of my design can multiple save Capex
vs. present ships. It can be effective used for export: fresh foods, other mass
cargo for a long distance, and as a military quick response. A power
of my ship is proportional to its speed, while for conventional ships it is to
the cube of speed. As idea it goes back to summer, 2018.
Two key elements of
my ship are [1]:
(1) Slightly lower than
sea level, the ship’s nose is tilted back and like a wedge it bends
the upstream water upward in the air, and it substitutes the big water
resistance by the air resistance being in three orders of magnitude less one Such energy effect is inherent for very big velocity..
It is new kind of sea ship, breaking all stereotypes.
(2) to add a thin
pressed air cocoon created around a hull of the ship. It reduces the power
loses by the water viscosity practically to zero.
Power consideration
for my ship
Let be
W (kW) – power
Q (m3/s}- water rate
H (m) – ship’s
draft = nose height submerged
B (m) – ship’s nose
beam submerged
S (m2) = B * H
l (m) nose length submerged
V (m/s) – velocity
= V (km/h) / 3.6
T = l / V
(m/s)
So
W = Q * H = ( l * B
* H / T ) * H = B * H^2 * V = S * H * V
(km/h) / 3.6,
So W = 0.28 * S * H
* V (km/h), hence a power is proportional to a speed !!!.
While for conventional
ships it is W = a * S * V^3 / 2
Economics of
transportation
Let a ship of my
design be
H = 6 m, B = 10 m,
6500 dwt,
and V = 900 km/h
Let abovementioned
air cocoon be consuming 10,000 kW
So for the said
ship of my design :
W = 0.28 * 10 * 36 * 900 = 90,700 kW + ~10,000 kW (for the cocoon)
So W ~= 100,000 kW totally
1.0 ton-km is
OPEX = (if 0.1 USD/kWh) = 100,000 kW * 1 km/ 900 km/h / 6500 dwt = 0.017
kWh =
So OPEX = 0,0017
USD/ ton-km
:
For comparison with
typical dry cargo ships
I can suppose my
ship\s price to be 1.5 times bigger per DWT unit than typical Handysize conventional
ships, and for very large one – 1.8 times
(1) High speed
cargo ship
48,000 dwt, 32,000
kW, 25 knots = 46 km/h
(6,500 / 48,000) *
(900 / 46 ) = 2.65
2.65 * 48,000 /6,500 /1.5 = 13.0 times
better by capital cost .
2.65 * (32,000/
100,000 = 0.85 worse by fuel consume
(2) Low speed cargo
ship
49,000 dwt, 13 knot
= 24 km/h, 27 TO/d ~= 5,300 kW
(6,500 / 49,000) *
(900 / 24) = 5.0, or 89% capital cost saving
5.0 * 49,000 / 6,500 / 1.5 = 25.0, or 96% capital cost saving
5.0 * (5,300 /
100,000) = 0.26.
1 / 0.26 = 3.8
times more fuel consume, but being multiple less by cost than capital one
(3) Very Large cargo
ship of low speed
185,000 dwt, 12,700
kW, 13 kns = 24 km/h
(6500 /185,000) * (900
/ 24) = 1.3
1.3 * 185,000 /6,500 /1.8 = 20.0, or 95% capital cost saving,
but 6 times more
fuel consume, but if quick delivery for long distance and CAPEX being important, my ship is
out of any competition, and can be in demand.
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