TheNavalArch - Ship Energy Efficiency Design Index (EEDI) Calculator

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thenavalarch
Leak Patrol
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TheNavalArch - Ship Energy Efficiency Design Index (EEDI) Calculator

Postby thenavalarch » Tue Jan 02, 2018 7:59 pm

TheNavalArch launches a beta (testing) version of https://thenavalarch.com/ship-energy-efficiency-design-index-eedi-calculator/. Available till 03rd Feb 2018.

This spreadsheet calculates the Energy Efficiency Design Index (EEDI) of a new ship. EEDI is a measure of carbon emissions of a ship.
[*]Simple user interface with easy inputs
[*]Exhaustively calculates the contribution of all components - Main and Aux Engines, Shaft Generators/Motors, Clean Energy Technologies
[*]Can be used for all types of vessels
[*]Diligently calculates specific factors for different cases - Ice class, Gen Cargo, Bulk Carriers, Ro-Ro vessels etc
[*]Produces a readable PDF report as output
For more details, visit https://thenavalarch.com/ship-energy-efficiency-design-index-eedi-calculator/

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Merlyn
Fleet Engineer
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Joined: Wed Dec 25, 2013 7:19 am
Currently located: South Coast UK

Re: TheNavalArch - Ship Energy Efficiency Design Index (EEDI) Calculator

Postby Merlyn » Thu Jan 04, 2018 3:56 am

I read your publication with interest but are all your calculations of a theoretical nature solely?
Are you actually performing smoke emission testing physically to compare the supposedly applied formulae that you are using?
If so what's the varying differential factor or is it a constant?
Are you using a four or five gas smoke meter?
Always been my experience that actual physical readings are always higher than the calculated ones.
What's the calibration timings for the smokemeters you are using?
Over here it's six or twelve months mandatory periods.
Are you referring to a collective exhaust discharge or a straight off the manifold measurement for each engine?
And why not LNG / DE / CDOG etc engines or any dual fuel ones as they all have a measurable discharge lower reading.
Would you not agree that on a lot of occasions calculated measurements do not always match actual physically taken ones?
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Big Pete
Engineering Mentor
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Currently located: Solihull, England

Re: TheNavalArch - Ship Energy Efficiency Design Index (EEDI) Calculator

Postby Big Pete » Fri Jan 05, 2018 12:35 am

In my experience I would say that calculated measurements are almost always higher than measured ones, the calculation is on the basis that every component in the system is "perfect", and that only happens on the "Test Bed", not at all representative of the real world.
The parameters for most Test Bed trials are chosen by the engine makers to give them the most favourable results, for emissions or fuel consumption, or whatever they are trying to demonstrate on that particular run.
We only have to look at Vokswagen and the other German Car makers who all conspired together to evade US emissions controls.
Real life is always different from the Test Bed and theoretical calculations.
BP
It is always better to ask a stupid question than to do a stupid thing.

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Merlyn
Fleet Engineer
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Joined: Wed Dec 25, 2013 7:19 am
Currently located: South Coast UK

Re: TheNavalArch - Ship Energy Efficiency Design Index (EEDI) Calculator

Postby Merlyn » Fri Jan 05, 2018 5:32 am

Agreed Big Pete 100%
Same as times given for engine/ gearboxes etc etc overhauls major /minor ones.
All times quoted are referred to sometimes by owner/operators?
This is blatantly an attempt to reduce repair costing.
What they conveniently forget is all times quoted are for new engines straight off the manufacturing batch run.
In the real world it's vastly different as those of us in the trade proper are aware of.
Sheared exhaust manifold studs for one.
Drilling and tapping in inaccessible places whilst stood on ones head.
Diamond hard hot spots created in the casting being drilled by a lifetime of high temperatures down to cold causing drills to wander off center despite using center drills to start the process off.
Stripping components on a Dyno. or a factory floor is somewhat different to an installed engine tight up against bulkheads/ other fittings etc.
Or designed overhead gantries not in the right place.
I maintain that in order to be a satisfactory designer/theoretical person you should have been forced to work on the tools properly or else you cannot and will not ever understand the job and it's inherent problems it can and will bring in real life.
Sadly I have to say people I went to school with, went to get the tickets with and worked with had they done a twenty year apprenticeship would never had made it and spent a lifetime hiding in a drawing office stinking of aftershave to cover up all the bulshit flying around.
Transmission ends.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Merlyn
Fleet Engineer
Posts: 797
Joined: Wed Dec 25, 2013 7:19 am
Currently located: South Coast UK

Re: TheNavalArch - Ship Energy Efficiency Design Index (EEDI) Calculator

Postby Merlyn » Wed Jan 17, 2018 6:37 am

Just had a manufacturers circular arrived, new software must be downloaded ( at a cost ) by May 2018 to all certified smokemeters over here as they are struggling to measure some of the newer CR emissions outputs.
Heading towards that target of just compressed air discharge to atmosphere methinks.
Don't know why diesels are being slagged off here, the newer the engine the less goes up the funnel for sure.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.


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