2011.10 DNV-SDARI Ship Fuel Savings
Post on 26-Jul-2015
66 Views
Preview:
DESCRIPTION
Transcript
, an
Guideline for Fuel Saving MeasuresReturn on Investment Calculator
for Bulk Carriers
Content
14 October 2011 By SDARI and DNV
• Introduction• 14 Fuel Saving Measures• Return on Investment Calculation• Advisory Services• Concluding remarks
Tough market
The cost of fuel has increased drastically the last year
Most analysts indicate further increase in fuel oil prices
Market conditions are challenging, with low charter rates in the bulk carrier segment
The outlook is not positive, considering the large number of bulk carriers in the orderbook
Being able to cut cost, e.g. by saving fuel may be the
differentiator needed to stay in business!
14 October 2011 By SDARI and DNV
FREIGHT RATES
BUNKER PRICES
5-10% fuel saving potential
Fuel is currently between 60% - 70% of a bulk carriers total operating expenses
DNV presented the abatement curves in 2009, which identified a large potential in the area “Propulsion Efficiency Devices” .
This project hasconcludedthat fuel saving of up to 5-10% canbe achieved
14 October 2011
Average marginal CO2 reduction cost per option - Bulker
Baseline: 348 mill tonnes per year
-100
-50
0
50
100
150
200
250
300
0 50 100 150 200
CO2 reduction (million tons per year)
Co
st p
er
ton
CO
2 a
vert
ed
($
/to
n)
Voyage execution
Engine monitoring
Contra-rotating propellers
Propulsion efficiency devices
Trim/draftPropeller condition
Frequency convertors
Air cavity/lubrication
Weather routing
Hull condition
Reduce auxiliary power
Kite
Speed reduction (port efficiency)
Cold ironing
Exhaust gas boilers on aux (not shown)
Fixed sails/wings
Speed reduction (fleet increase)
Fuel cells as aux engineLight system
Electronic engine control
Gas fuelled
Waste heat recovery
2
Solar panel (not shown)Wind generator (not shown)
By SDARI and DNV
A jungle of fuel saving measures
A NUMBER OF DEVICES ON THE MARKETMany questions are raised:
• How does the device work?
• Are different devices compatible?• Will the yard have capability to install?
• What is the reduction in fuel consumption?
• How much will a certain device cost?• How can cost/benefit be calculated?
14 October 2011 By SDARI and DNV
Mewis duct
Becker Marine Systems
Energopac
Wärtsilä
Wake equalizing duct
Schneekluth
Contra-rotating propeller
Wärtsilä and IHI Marine Utd.
Propeller Boss Cap Fin
MOTech
A Guide through the jungle
SDARI and DNV have worked together in a joint project to produce a detailed guideline covering:
•Description, including compatibility•Requirements from classification
•Complexity of manufacturing
•Range of expected fuel saving•Expected maintenance needs
•Indication of price range
Describes fourteen of the most relevant fuel saving measures.
An independent guideline, of the most relevant measures, covering the important aspects
14 October 2011 By SDARI and DNV
Content
14 October 2011 By SDARI and DNV
• Introduction• 14 Fuel Saving Measures• Return on Investment Calculation• Advisory Services• Concluding remarks
Scope of Guideline
Mewis Duct
14 October 2011 By SDARI and DNV
We are covering the most important issues for a number of different fuel saving measures and in the following a brief description of each measure will be given
Pre-swirl stator
Propeller nozzle
Propeller boss cap fins
Contra-rotating propeller
Propeller rudder transition bulb
Pre-duct
Also considered are: - Rudder profile- Propeller design- Hull shape- Main engine- Auxiliary engine
- Waste heat recovery system
- Openings –arrangement and design
Mewis duct
• Design:– Vertically offset mounted duct – Integrated asymmetric fin– The MD should be optimized for the given
ship
• Class requirements– The connection to the hull structure will be
evaluated– For ice classed vessels special consideration
are required
• Manufacturing:– May, according to inventor, be retrofitted
without changes to the propeller
• Compatibility:
14 October 2011 By SDARI and DNV
Installed Mewis Duct
Mewis duct
• Effect: – Wake equalizing duct gives improved wake
flow characteristics– Pre swirl fins give improved tangential inflow
speeds to the propeller
• Saving potential: – 5-8% of power
• Means of validation:– Model tests– Computational Fluid Dynamics (CFD)– Full-scale trials
• Cost:– 170-290 kUSD, depending on ship size– Design cost of 140 kUSD per series
14 October 2011 By SDARI and DNV
CFD plots in plane after Mewis duct and before propeller. Courtesy of Becker Marine Systems
Link to overview of fuel saving measures
Propeller boss cap fins
• Design:– Consists of small fins attached to the
propeller hub– Number of fins equal to the number of
propeller blades– The propeller cap turbine is a proposed
improvement, with curved blades
• Class requirements:– No specific requirements
• Manufacturing:– Installed instead of a normal cap– Yard must consider strength of connecting
bolts and clearance to the rudder
• Compatibility:
14 October 2011 By SDARI and DNV
Propeller boss cap fins (PBCF)
Propeller boss cap fins
• Effect: – Recovers the energy from the rotating fluid coming of the propeller hub– Reduces the hub vortex generation – Reduces risk of cavitation– Increased overall propeller efficiency
• Saving potential: – 2-4% of power
• Means of validation:– Model tests– CFD
• Cost:– From 67 (Handy size) to 170 (205K DWT) kUSD – Design cost of 72 kUSD per series
14 October 2011 By SDARI and DNV
Link to overview of fuel saving measures
Compatibility Summary
14 October 2011 By SDARI and DNV
Content
14 October 2011 By SDARI and DNV
• Introduction• 14 Fuel Saving Measures• Return on Investment Calculation• Advisory Services• Concluding remarks
Return on Investment Calc.
The characteristics of the fuel saving measures is entered, based on information in the Guideline
Investment cost is a required input while maintenance cost and re-sale impact are optional
14 October 2011 By SDARI and DNV
Return on Investment Calc.
An operating profile is entered, and there are two alternatives for specifying fuel consumption:
Alt. 1 – specifying
•ME size, •MCR and
•SFOC
or the simpler
Alt. 2 – only specifying ton/day
14 October 2011 By SDARI and DNV
Return on Investment Calc.
Several fuel price scenarios can be entered and used in the analysis:
•High•Medium
•Low
•Custom
14 October 2011 By SDARI and DNV
Bulk carrier example
Fuel Consumption •32 tons/day laden
•25 tons/day in ballast
Based on information in the guideline:
•Propeller Boss Cap Fins is selected•Est. reduction in fuel consumption:3% laden / 2% ballast•Est. investment cost USD 47 000 / ship
•Est. maintenance cost USD 5000 / ship
Conservative fuel price scenario, starting at 550 with an annual growth of 2%
Selected numbers are only for illustration
14 October 2011 By SDARI and DNV
Profitable after 5 months!
Estimated fuel saving 228 tons / yr.
USD 47,000 investment gives a
net present value: USD 269’ USD
Cash flow plot shows that the measure is profitable after 5 months
Cost sensitivity is also calculated, to take into account possible cost over runs, showing that with a 40% over run, it still becomes profitable in less than a year!
Selected numbers are only for illustration
14 October 2011 By SDARI and DNV
.. and Emission Reductions
Emission reductions are also calculated – based on standard IMO values
The reductions are estimated for:•CO2
•SOx
•NOx
•Particle matters (PM)
In Appendix 2, in the report, the details on the ROI tool is described
14 October 2011 By SDARI and DNV
Content
14 October 2011 By SDARI and DNV
• Introduction• 14 Fuel Saving Measures• Return on Investment Calculation• Advisory Services• Concluding remarks
© Det Norske Veritas AS. All rights reserved.
Fuel saving measures
10 August 2011
22
Level 1Fuel saving measures – Screening and Return on Investment
� Deliverables- Short list of recommended fuel saving measures – typically 3-4
- Return on Investment calculation for selected measures
� Scope of work- Apply Guide and Return on Investment tool for fuel saving measures to
prepare a short list of measures with high potential for saving and / or short payback time
- The assessment considers the ship characteristics and operation
� Input- Ship main dimensions, engine power, type of propulsion, rudder and possible
appendages
- Ship operational profile
- Nice to have: Any other available data like model test results and engine characteristics
© Det Norske Veritas AS. All rights reserved.
Fuel saving measures
10 August 2011
23
Level 2Fuel saving measures – Recommended fuel saving strategy
� Deliverables- Updated estimate of saving for selected measures- Recommended strategy for fuel saving, which could include one
or more measures
� Scope of work- Obtain detailed information regarding saving potential, installation
and maintenance cost for the short list of measures. This includescontacting suppliers and a thorough review of availabletechnical data
- Optional risk assessment or technology qualification may becarried out for measures with limited operational history for thesubject vessel type and trade
- A more accurate Return on Investment analysis is carried out for the selected measure
� Input- Short list of fuel saving measures- Other relevant input from the owner, e.g. previous experience with fuel saving measures,
cooperation with or preference for specific yards or suppliers
© Det Norske Veritas AS. All rights reserved.
Fuel saving measures
10 August 2011
24
Level 3Validation of fuel saving by analysis
� Purpose- Validate fuel saving and optionally provide speed power curve
� Deliverables- Calculated fuel saving for selected measure- Optional speed power curves with and without installed measure
� Scope of work- Calculation of required power by modeling a self propelled ship in calm water for a number of
speeds by computational fluid dynamics at full scale- Determine speed power curves both for original and modified vessel
� Input- Detailed geometrical description of the ship hull, propeller and appendages, as well as
selected fuel saving measure- Relevant selection of combinations of speed and draft / trim to assess savings (based on
operational profile)
© Det Norske Veritas AS. All rights reserved.
Hydrodynamic Analyses for Ship Performance Predictions
14 December 2010
25
Level 4Trim Optimization� Purpose:
- Calculate how the hull resistance is influenced by differnent trim and drafts
� Deliverables: - A) Trim Recommendation table (Avoid/Fair/Good)- B) Onboard trim optimization tool
� Scope of Work- Advanced CFD calculation for analyzing changes in wave-making resistance and in
frictional resistance and comparison to even keel base case.
� Input- Hull Geometry and Loading Manual- Operational profile: speed and loading conditions
26
Contact
Please contact your local Customer Service Manager or DNV Maritime Advisory / NTANO362@dnv.com for a quote.
14 October 2011 By SDARI and DNV
Content
14 October 2011 By SDARI and DNV
• Introduction• 14 Fuel Saving Measures• Return on Investment Calculation• Advisory Services• Concluding remarks
Disclaimer
14 October 2011 By SDARI and DNV
The Guideline for the Fuel Saving Devices and the Return of Investment Calculator (the "SDARI and DNV Products") are developed by SDARI and DNV and provided to our clients free of charge. We have taken all reasonable care in the development of the SDARI and DNV Products, but SDARI / DNV cannot guarantee that the SDARI and DNV Products will function error free or that estimated fuel savings will be met. Therefore, SDARI and DNV disclaim any responsibility, liability and consequences in relation to the use of the SDARI and DNV Products.
© SDARI and DNV
Concluding remarks
We believe this Guideline and the Return on Investment calculator will be useful in our clients endeavours to save fuel and reduce shipping’s
environmental impact, and we therefore offer it free of charge to our clients.
14 October 2011 By SDARI and DNV
30
Safeguarding life, property and the environment
www.dnv.com
top related