Trans RINA, Vol 156, Part B2, Intl J Small Craft Tech, Jul-Dec 2014
Table 5: Fishing Operation Type One Typical Engine Loads during different Vessel Operations Vessel Operation
Duration (hrs)
Steaming to fishing grounds Setting of fishing gear Retrieval of fishing gear
Steaming between fishing locations
2-15 1-3 1-3
1-2
Speed (knots)
7-8.5 4-6 0-6
7-8.5
Froude Number (on LWL)
0.34-0.36 0.17-0.26 0-0.26
0.34-0.36 Vessel at anchor or mooring 13-17 0 0 Operation
Steaming to fishing grounds
Duration (hrs)
0.08-2
Setting of fishing gear 1-3
Retrieval of fishing gear 1-3
Steaming between fishing locations
Vessel at anchor or mooring
Speed (knots)
7-8
4-5 0-5
Froude Number (on LWL)
0.31-0.38
0.18-0.24 0-0.24
0 0 0 18-20 0 0
Propulsion Engine Loads (% of Max RPM) 75-80 50-60 50-60
75-80 0
Propulsion Engine Loads (% of Max RPM)
75-80
50-60 50-60
75-80 0
Auxiliary Engine Loads (% of Max RPM) 0-50 0-50 0-50
0-50 0-50
Table 6: Fishing Operation Type Two Typical Engine Loads during different Vessel Operations Vessel
0-50
0-50 0-50
0-50 0-50
Auxiliary Engine Loads (% of Max RPM)
Estimated Fuel use (L/h)
10-40 15-25 15-25
10-40 3-10
Estimated Fuel use (L/h)
10-40
15-25 15-25
10-40 3-10
From Table 5 and Table 6, we can see that for southern rock-lobster vessels, the following were observed:
they spend a large portion of their time sitting at anchor;
steaming speeds of the vessels are at the higher end of the displacement regime; and
they retrieve their fishing gear at varying speeds between 0 and 6 kn.
3.4. ENERGY BREAKDOWN OF SOUTHERN ROCK-LOBSTER VESSEL
To further investigate the best options for reducing diesel consumption of these vessels, an energy breakdown of the systems aboard each vessel was estimated. Using assumptions and the equipment specifications (such as for engines, generators and pumps) of the vessels surveyed, an energy breakdown for the vessel systems using the chemical potential energy is shown in Figure 4.
Diesel Fuel Input 100%
Prime Mover 85‐90%
Gear Box 42.5‐45%
Propulsor 75‐79%
Shaft and
bearing losses less than 1%
Alternator 5%
24 V Electrical System
Steering Gear Shaft Driven
Hydraulic Pump 5%
Heat Losses 55‐58.5%
Anchor Winch Pot Hauler
Flood Lights
Auxiliary Engine
10‐15%
Alternator 3.5‐5.25%
Heat Losses 6.5‐9.75%
240V Electrical System
Refirgeration system
(if installed)
RSW stystem pumps (if installed)
Effective Thrust 7.5‐7.9%
Propulsor Losses
18‐19% Vessel
Navigation Systems
Battery Bank
Figure 4: Chemical Energy Breakdown of Southern Rock-Lobster Vessel
©2014: The Royal Institution of Naval Architects
B-61
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