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2012 Guidelines on the method of calculation of the attained Energy Efficiency Ddesign index (EEDI) for new ships

  dd-mm-yyyy = Entry into force
DocumentMEPC/Res.212(63)01-01-2013
RevokesMEPC.1/Circ.68131-12-2012 Expired
Amended byMEPC/Res.224(64)02-10-2012

 

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2012 Guidelines on the method of calculation of the attained Energy Efficiency Ddesign index (EEDI) for new ships

  dd-mm-yyyy = Entry into force
DocumentMEPC/Res.212(63)01-01-2013
RevokesMEPC.1/Circ.68131-12-2012 Expired
Amended byMEPC/Res.224(64)02-10-2012

 

1 Definitions

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1 - Definitions

MARPOL means the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 relating thereto, as amended. For the purpose of these Guidelines, the definitions in "REGULATIONS ON ENERGY EFFICIENCY FOR SHIPS" (RESOLUTION MEPC. 203(62)) apply.

2 Energy Efficiency Design Index (EEDI) including the equation

2 - Energy Efficiency Design Index (EEDI) including the equation

The attained new ship Energy Efficiency Design Index (EEDI) is a measure of ships energy efficiency (g/t*nm) and calculated by the following formula:



* If part of the Normal Maximum Sea Load is provided by shaft generators, SFCME and CFME may – for that part of the power – be used instead of SFCAE and CFAE

** In case of PPTI(i)>0, the average weighted value of (SFCME.CFME) and (SFCAE.CFAE ) to be used for calculation of Peff

Note: This formula may not be able to apply to diesel-electric propulsion, turbine propulsion or hybrid propulsion system.

Where:

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2 - Energy Efficiency Design Index (EEDI) including the equation

The attained new ship Energy Efficiency Design Index (EEDI) is a measure of ships energy efficiency (g/t*nm) and calculated by the following formula:



* If part of the Normal Maximum Sea Load is provided by shaft generators, SFCME and CFME may – for that part of the power – be used instead of SFCAE and CFAE

** In case of PPTI(i)>0, the average weighted value of (SFCME.CFME) and (SFCAE.CFAE ) to be used for calculation of Peff

Note: This formula may not be able to apply to diesel-electric propulsion, turbine propulsion or hybrid propulsion system.

Where:

2.1 Conversion factor between fuel consumption and CO2 emission

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2.1 - CF ; conversion factor between fuel consumption and CO2 emission

CF is a non-dimensional conversion factor between fuel consumption measured in g and CO2 emission also measured in g based on carbon
content. The subscripts MEi and AEi refer to the main and auxiliary engine(s) respectively. CF corresponds to the fuel used when determining SFC listed in the applicable test report included in a Technical File as defined in paragraph 1.3.15 of NOx Technical Code ("test report included in a NOx technical file" hereafter). The value of CF is as follows:

Type of fuel

Reference

Carbon
content

CF
(t-CO2/t-Fuel)

1Diesel/Gas OilISO 8217 Grades DMX through DMB

0.8744

3.206

2Light Fuel Oil (LFO) ISO 8217 Grades RMA through RMD

0.8594

3.151

3Heavy Fuel Oil (HFO)ISO 8217 Grades RME through RMK

0.8493

3.114

4Liquefied Petroleum Gas (LPG)Propane

0.8182

3.000

Butane

0.8264

3.030

5Liquefied Natural Gas (LNG) 

0.7500

2.750


2.10 Availability factor

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2.10feff(i) is the availability factor of each innovative energy efficiency technology.
feff(i) for waste energy recovery system should be one (1.0)1.


1EEDI calculation should be based on the normal sea-going condition outside Emission Control Area designated under paragraph 6 of regulation 13 in MARPOL ANNEX VI.

2.11 Capacity factor for any technical/regulatory limitation

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2.11 fi is the capacity factor for any technical/regulatory limitation on capacity, and should be assumed to be one (1.0) if no necessity of the factor is granted.

2.11.1 The capacity correction factor, fi, for ice-classed ships should be taken as the lesser value of fi0 and fi,max as tabulated in Table 2, but not less than fi,min = 1.0. For further information on approximate correspondence between ice classes, see HELCOM Recommendation 25/71.

Table 2: Capacity correction factor fi for ice-classed ships

Ship type

fj0

fj,min depending on the ice class

IA Super

IA

IB

IC

Tanker

2.10LPP  -0.11

1.71LPP-0.08

1.47LPP-0.06

1.27LPP-0.04

Bulk carrier

2.10LPP  -0.11

1.80LPP-0.09

1.54LPP-0.07

1.31LPP-0.05

General cargo ship

2.18LPP  -0.11

1.77LPP-0.08

1.51LPP-0.06

1.28LPP-0.04

Containership

2.10LPP-0.11

1.71LPP-0.08

1.47LPP-0.06

1.27LPP-0.04

Gas carrier

1.25

2.10LPP-0.12

1.60LPP-0.08

1.25LPP-0.04

 

2.11.2fi VSE for ship specific voluntary structural enhancement is expressed by the following formula:

Where


For this calculation the same displacement (¿) for reference and enhanced design should be taken.

DWT before enhancements (DWTreference design) is the deadweight prior to application of the structural enhancements. DWT after enhancements (DWTenhanced design) is the deadweight following the application of voluntary structural enhancement. A change of material (e.g. from aluminum alloy to steel) between reference design and enhanced design should not be allowed for the fi VSE calculation. A change in grade of the same material (e.g. in steel type, grades, properties and condition) should also not be allowed.

In each case, two sets of structural plans of the ship should be submitted to the verifier for assessment. One set for the ship without voluntary structural enhancement; the other set for the same ship with voluntary structural enhancement. (Alternatively, one set of structural plans of the reference design with annotations of voluntary structural enhancement should also be acceptable.) Both sets of structural plans should comply with the applicable regulations for the ship type and intended trade.

2.11.3 for bulk carriers and oil tankers, built in accordance with Common Structural Rules (CSR) of the classification societies and assigned the class notation CSR, the following capacity correction factor fiCSR should apply:

fiCSR = 1 + (0.08 · LWTCSR / DWTCSR)

Where, DWTCSR is the deadweight determined by paragraph 2.4 and LWTCSR is the light weight of the ship.

2.11.4 for other ship types, fi should be taken as 1.0.


1HELCOM Recommendation 25/7 may be found at http://www.helcom.fi.

2.12 Cubic capacity correction factor

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2.12 fc is the cubic capacity correction factor and should be assumed to be one (1.0) if no necessity of the factor is granted.

2.12.1 for chemical tankers, as defined in regulation 1.16.1 of MARPOL Annex II, the following cubic capacity correction factor fc should apply:

fc = R-0.7 - 0.014, where R is less than 0.98

or

fc = 1.000, where R is 0.98 and above;

where: R is the capacity ratio of the deadweight of the ship (tonnes) as determined by paragraph 2.4 divided by the total cubic capacity of the cargo tanks of the ship (m3).

2.12.2 for gas carriers having direct diesel driven propulsion system constructed or adapted and used for the carriage in bulk of liquefied natural gas, the following cubic capacity correction factor fcLNG should apply:

fcLNG = R-0.56

where, R is capacity ratio of deadweight of the ship (tonnes) as determined by paragraph 2.4 divided by the total cubic capacity of the cargo tanks of the ship (m3).

2.13 Length between perpendiculars, Lpp

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2.13Length between perpendiculars, Lpp means 96 per cent of the total length on a waterline at 85 per cent of the least moulded depth measured from the top of the keel, or the length from the foreside of the stem to the axis of the rudder stock on that waterline, if that were greater. In ships designed with a rake of keel the waterline on which this length is measured should be parallel to the designed waterline. The length between perpendiculars (Lpp) should be measured in metres.

2.2 Ship speed

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2.2 - Vref ; ship speed

Vref is the ship speed, measured in nautical miles per hour (knot), on deep water in the condition corresponding to the Capacity as defined in paragraphs 2.3.1 and 2.3.3 (in case of passenger ships and ro-ro passenger ships, this condition should be summer load draught as provided in paragraph 2.4) at the shaft power of the engine(s) as defined in paragraph 2.5 and assuming the weather is calm with no wind and no waves.

2.3 Capacity

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2.3 - Capacity

Capacity is defined as follows:

2.3.1 For bulk carriers, tankers, gas tankers, ro-ro cargo ships, general cargo ships, refrigerated cargo carrier and combination carriers, deadweight should be used as Capacity.

2.3.2 For passenger ships and ro-ro passenger ships, gross tonnage in accordance with the International Convention of Tonnage Measurement of Ships 1969, Annex I, regulation 3 should be used as Capacity.

2.3.3 For containerships, 70 per cent of the deadweight (DWT) should be used as Capacity. EEDI values for containerships are calculated as follows:

  1. attained EEDI is calculated in accordance with the EEDI formula using 70 per cent deadweight for Capacity.

  2. estimated index value in the Guidelines for calculation of the reference line is calculated using 70 per cent deadweight as:



  3. parameters a and c for containerships in Table 2 of regulation 21 of MARPOL Annex VI are determined by plotting the estimated index value against 100 per cent deadweight i.e. a=174.22 and c=0.201 were determined.

  4. required EEDI for a new containership is calculated using 100 per cent deadweight as:


    Required EEDI = (1-X/100) · a · 100% deadweight –c


    Where X is the reduction factor (in percentage) in accordance with Table 1 in regulation 21 of MARPOL Annex VI relating to the applicable phase and size of new containership.

2.4 Deadweight

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2.4 - Deadweight

Deadweight means the difference in tonnes between the displacement of a ship in water of relative density of 1,025 kg/m3 at the summer load draught and the lightweight of the ship. The summer load draught should be taken as the maximum summer draught as certified in the stability booklet approved by the Administration or an organization recognized by it.

2.5 Power of main and auxiliary engines

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2.5 - Power of main and auxiliary engines

P is the power of the main and auxiliary engines, measured in kW. The subscripts ME and AE refer to the main and auxiliary engine(s), respectively. The summation on i is for all engines with the number of engines (nME).
(See diagram in appendix 1.)

2.5.1 - power of main engines
PME(i) is 75 per cent of the rated installed power (MCR1) for each main engine (i).

The influence of additional shaft power take off or shaft power take in is defined in the following paragraphs.

2.5.2 - shaft generator
In case where shaft generator(s) are installed, PPTO(i) is 75 per cent of the rated electrical output power of each shaft generator.

For calculation of the effect of shaft generators two options are available:

Option 1:

  1. The maximum allowable deduction for the calculation of  is to be no more than PAE as defined in paragraph 2.5.6. For this case, is calculated as:



or

Option 2:

  1. Where an engine is installed with a higher rated power output than that which the propulsion system is limited to by verified technical means, then the value of is 75 per cent of that limited power for determining the reference speed, Vref and for EEDI calculation.


    The following figure gives guidance for determination of :

2.5.3 - shaft motor
In case where shaft motor(s) are installed, PPTI(i) is 75 per cent of the rated power consumption of each shaft motor divided by the weighted average efficiency of the generator(s), as follows:

Where:


PSM,max(i) is the rated power consumption of each shaft motor
 is the weighted average efficiency of the generator(s)

 

The propulsion power at which vref is measured, is:

Where:

 is the efficiency of each shaft motor installed

Where the total propulsion power as defined above is higher than 75 per cent of the power the propulsion system is limited to by verified technical means, then 75 per cent of the limited power is to be used as the total propulsion power for determining the reference speed, Vref and for EEDI calculation.

In case of combined PTI/PTO, the normal operational mode at sea will determine which of these to be used in the calculation.

Note: The shaft motor's chain efficiency may be taken into consideration to account for the energy losses in the equipment from the switchboard to the shaft motor, if the chain efficiency of the shaft motor is given in a verified document.

2.5.4 - Output of innovative mechanical energy efficient technology
Peff(i) is the output of the innovative mechanical energy efficient technology for propulsion at 75 per cent main engine power.

Mechanical recovered waste energy directly coupled to shafts need not be measured, since the effect of the technology is directly reflected in the Vref.

In case of a ship equipped dual-fuel engine or a number of engines, the CFME and SFCME should be the power weighted average of all the main engines.

2.5.5 -Auxiliary power reduction
PAEeff (i) is the auxiliary power reduction due to innovative electrical energy efficient technology measured at PME(i).

2.5.6 -Power of auxiliary engines
PAE is the required auxiliary engine power to supply normal maximum sea load including necessary power for propulsion machinery/systems and accommodation, e.g. main engine pumps, navigational systems and equipment and living on board, but excluding the power not for propulsion machinery/systems, e.g. thrusters, cargo pumps, cargo gear, ballast pumps, maintaining cargo, e.g. reefers and cargo hold fans, in the condition where the ship engaged in voyage at the speed (Vref) under the condition as mentioned in paragraph 2.2.

  1. For ships with a total propulsion power  of 10,000 kW or above, PAE is defined as:





  2. For ships with a total propulsion power  below 10,000 kW, PAE is defined as:




  3. For ship where the PAE value calculated by paragraph 2.5.6.1 or 2.5.6.2 is significantly different from the total power used at normal seagoing, e.g. in cases of passenger ships (see NOTE under the formula of EEDI), the PAE value should be estimated by the consumed electric power (excluding propulsion) in conditions when the ship is engaged in a voyage at reference speed (Vref) as given in the electric power table2, divided by the average efficiency of the generator(s) weighted by power (see appendix 2).


1 The value of MCR specified on the EIAPP certificate should be used for calculation. If the main engines are not required to have an EIAPP certificate, the MCR on the nameplate should be used.
2 The electric power table should be examined and validated by the verifier. Where ambient conditions affect any electrical load in the power table the contractual ambient conditions leading to the maximum design electrical load of the installed system for the ship in general should apply.

2.6 Capacity and P should be consistent with each other

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2.6 - Vref, Capacity and P should be consistent with each other.

2.7 SFC ; Specific fuel consumption

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2.7 - SFC ; Specific fuel consumption

SFC is the certified specific fuel consumption, measured in g/kWh, of the engines. The subscripts ME(i) and AE(i) refer to the main and auxiliary engine(s), respectively. For engines certified to the E2 or E3 test cycles of the NOx Technical Code 2008, the engine Specific Fuel Consumption (SFCME(i)) is that recorded in the test report included in a NOx technical file for the engine(s) at 75 per cent of MCR power of its torque rating. For engines certified to the D2 or C1 test cycles of the NOx Technical Code 2008, the engine Specific Fuel Consumption (SFCAE(i)) is that recorded on the test report included in a NOx technical file at the engine(s) 50 per cent of MCR power or torque rating.

The SFC should be corrected to the value corresponding to the ISO standard reference conditions using the standard lower calorific value of the fuel oil (42,700kJ/kg), referring to ISO 15550:2002 and ISO 3046-1:2002.

For ships where the PAE value calculated by paragraphs 2.5.6.1 and 2.5.6.2 is significantly different from the total power used at normal seagoing, e.g. conventional passenger ships, the Specific Fuel Consumption (SFCAE) of the auxiliary generators is that recorded in the test report included in a NOx technical file for the engine(s) at 75 per cent of MCR power of its torque rating.

SFCAE is the power-weighted average among SFC AE(i) of the respective engines i.

For those engines which do not have a test report included in a NOx technical file because its power is below 130 kW, the SFC specified by the manufacturer and endorsed by a competent authority should be used.

At the design stage, in case of unavailability of test report in the NOx file, the SFC specified by the manufacturer and endorsed by a competent authority should be used.

For LNG driven engines of which SFC is measured in kJ/kWh should be corrected to the SFC value of g/kWh using the standard lower calorific value of the LNG (48,000 kJ/kg), referring to the 2006 IPCC Guidelines.

2.8 Correction factor for ship specific design elements

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2.8 - fj ; Correction factor for ship specific design elements

fj is a correction factor to account for ship specific design elements:

2.8.1 The power correction factor, fj, for ice-classed ships should be taken as the greater value of fj0 and fj,min as tabulated in Table 1 but not greater than fj,max = 1.0.

For further information on approximate correspondence between ice classes, see HELCOM Recommendation 25/71.

Table 1: Correction factor for power fj for ice-classed ships

Ship type

fj0

fj,min depending on the ice class

IA Super

IA

IB

IC

Tanker0.15LPP0.300.27LPP0.210.45LPP0.130.70LPP0.06
Bulk carrier0.47LPP0.090.58LPP0.070.73LPP0.040.87LPP0.02
General cargo ship0.31LPP0.160.43LPP0.120.56LPP0.090.67LPP0.07

2.8.2 The factor fj, for shuttle tankers with propulsion redundancy should be fj = 0.77. This correction factors applies to shuttle tankers with propulsion redundancy between 80,000 and 160,000 deadweight. The Shuttle Tankers with Propulsion Redundancy are tankers used for loading of crude oil from offshore installations equipped with dual-engine and twin-propellers need to meet the requirements for dynamic positioning and redundancy propulsion class notation.

2.8.3 For other ship types, fj should be taken as 1.0.


1HELCOM Recommendation 25/7 may be found at http://www.helcom.fi.

2.9 Non-dimensional coefficient

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2.9 fw is a non-dimensional coefficient indicating the decrease of speed in representative sea conditions of wave height, wave frequency and wind speed (e.g. Beaufort Scale 6), and is determined as follows:

2.9.1 for attained EEDI calculated under regulations 20 and 21 of MARPOL Annex VI, fw is 1.00;

2.9.2 when fw is calculated according to the subparagraph .2.1 or .2.2 below, the value for attained EEDI calculated by the formula in paragraph 2 using the obtained fw should be referred to as "attained EEDIweather";

  1.  fw can be determined by conducting the ship specific simulation on its performance at representative sea conditions. The simulation methodology should be based on the Guidelines developed by the Organization and the method and outcome for an individual ship should be verified by the Administration or an organization recognized by the Administration; and

  2. in cases where a simulation is not conducted, fw should be taken from the "Standard fw " table/curve. A "Standard fw " table/curve is provided in the Guidelines1 for each ship type defined in paragraph 1, and expressed as a function of Capacity (e.g. deadweight). The "Standard fw " table/curve is based on data of actual speed reduction of as many existing ships as possible under the representative sea condition.

fw and attained EEDIweather, if calculated, with the representative sea conditions under which those values are determined, should be indicated in the EEDI Technical File to make a distinction with the attained EEDI calculated under regulations 20 and 21 of MARPOL Annex VI.


1Guidelines for the calculation of the coefficient fw for the decrease of ship speed in respective sea conditions will be developed.

Appendix 1 A generic and simplified marine power plant

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Appendix 1 - A generic and simplified marine power plant

 

Note 1: Mechanical recovered waste energy directly coupled to shafts need not be measured, since the effect of the technology is directly reflected in the Vref .


Note 2: In case of combined PTI/PTO, the normal operational mode at sea will determine which of these to be used in the calculation.

Appendix 2 Guidelines for te development of electric power tables for EEDI (EPT-EEDI)

Appendix 2 - Guidelines for te development of electric power tables for EEDI (EPT-EEDI)

 

 

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Appendix 2 - Guidelines for te development of electric power tables for EEDI (EPT-EEDI)

 

 

1 Introduction to "Electric Power Table for EEDI"

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1 - Introduction to the document "Electric Power Table for EEDI"

1.1 This appendix contains a guideline for the document "Electric Power Table for EEDI" which is similar to the actual shipyards' load balance document, utilizing well defined criteria, providing standard format, clear loads definition and grouping, standard load factors, etc. A number of new definitions (in particular the "groups") are introduced, giving an apparent greater complexity to the calculation process. However, this intermediate step to the final calculation of PAE stimulates all the parties to a deep investigation through the global figure of the auxiliary load, allowing comparisons between different ships and technologies and eventually identifying potential efficiencies improvements.

2 Auxiliary load power definition

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2 - Auxiliary load power definition

2.2 PAE is to be calculated as indicated in paragraph 2.5.6 of the Guidelines, together with the following additional three conditions:

  1. no emergency situations (e.g. "no fire", "no flood", "no blackout", "no partial blackout");

  2. evaluation time frame of 24 hours (to account loads with intermittent use); and

  3. ship fully loaded of passenger and/or cargo and crew.

3 Definition of the data

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3 - Definition of the data to be included in the Electric Power Table for EEDI

3.1 The Electric power table for EEDI calculation should contain the following data elements, as appropriate:

  1. Load's group;

  2. Load's description;

  3. Load's identification tag;

  4. Load's electric circuit Identification;

  5. Load's mechanical rated power "Pm" [kW];

  6. Load's electric motor rated output power [kW];

  7. Load's electric motor efficiency "e" [/];

  8. Load's Rated electric power "Pr" [kW];

  9. Service factor of load "kl" [/];

  10. Service factor of duty "kd" [/];

  11. Service factor of time "kt" [/];

  12. Service total factor of use "ku" [/], where ku=kl·kd·kt;

  13. Load's necessary power "Pload" [kW], where Pload=Pr·ku;

  14. Notes;

  15. Group's necessary power [kW]; and

  16. Auxiliaries load's power PAE [kW].

4 Data to be included in the Electric Power Table for EEDI

4 - Data to be included in the Electric Power Table for EEDI

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4 - Data to be included in the Electric Power Table for EEDI

4.1 Load groups

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Load groups

4.1 The Loads are put into defined groups, allowing a proper breakdown of the auxiliaries. This eases the verification process and makes it possible to identify those areas where load reductions might be possible. The groups are listed below:

1A-

Hull, Deck, Navigation and Safety services;

 

2B-

Propulsion service auxiliaries;

 

3C-

Auxiliary Engine and Main Engine Services;

 

4D-

Ship's General services;

 

5E-

Ventilation for Engine-rooms and Auxiliaries room;

 

6F-

Air Conditioning services;

 

7G-

Galleys, refrigeration and Laundries services;

 

8H-

Accommodation services;

 

9I-

Lighting and socket services;

 

10L-

Entertainment services;

 

11N-

Cargo loads; and

 

12M-Miscellaneous.

 

All the ship's loads have to be delineated in the document, excluding only PAeff, the shaft motors and shaft motors chain (while the propulsion services auxiliaries are partially included below in paragraph 4.1.2 B). Some loads (i.e. thrusters, cargo pumps, cargo gear, ballast pumps, maintaining cargo, reefers and cargo hold fans) still are included in the group for sake of transparency, however their service factor is zero in order to comply with rows 4 and 5 of paragraph 2.5.6 of the Guidelines, therefore making it easier to verify that all the loads have been considered in the document and there are no loads left out of the measurement.

4.1.1 A - Hull, Deck, Navigation and safety services

  1. loads included in the Hull services typically are: ICCP systems, mooring equipment, various doors, ballasting systems, Bilge systems, Stabilizing equipment, etc. Ballasting systems are indicated with service factor equal to zero to comply with row 5 of paragraph 2.5.6 of the Guidelines;

  2. loads included in the deck services typically are: deck and balcony washing systems, rescue systems, cranes, etc.;

  3. loads included in the navigation services typically are: navigation systems, navigation's external and internal communication systems, steering systems, etc.; and

  4. loads included in the safety services typically are: active and passive fire systems, emergency shutdown systems, public address systems, etc.

4.1.2 B - Propulsion service auxiliaries
This group typically includes: propulsion secondary cooling systems such as LT cooling pumps dedicated to shaft motors, LT cooling pumps dedicated to propulsion converters, propulsion UPSs, etc. Propulsion service Loads do not include shaft motors (PTI(i)) and the auxiliaries which are part of them (shaft motor own cooling fans and pump, etc.) and the shaft motor chain losses and auxiliaries which are part of them (i.e. shaft motor converters including relevant auxiliaries such as converter own cooling fans and pumps, shaft motor transformers including relevant auxiliaries losses such as propulsion transformer own cooling fans and pumps, shaft motor Harmonic filter including relevant auxiliaries losses, shaft motor excitation system including the relevant auxiliaries consumed power, etc.). Propulsion service auxiliaries include manoeuvring propulsion equipments such as manoeuvring thrusters and their auxiliaries whose service factor is to be set to zero.

4.1.3 C – Auxiliary Engine and Main Engine Services
This group includes: cooling systems, i.e. pumps and fans for cooling circuits dedicated to alternators or propulsion shaft engines (seawater, technical water dedicated pumps, etc.), lubricating and fuel systems feeding, transfer, treatment and storage, ventilation system for combustion air supply, etc.

4.1.4 D – Ship's General services
This group includes Loads which provide general services which can be shared between shaft motor, auxiliary engines and main engine and accommodation support systems. Loads typically included in this group are: Cooling systems, i.e. pumping seawater, technical water main circuits, compressed air systems, fresh water generators, automation systems, etc.

4.1.5 E - Ventilation for Engine-rooms and Auxiliaries room
This group includes all fans providing ventilation for engine-rooms and auxiliary rooms that typically are: Engine-rooms cooling supply-exhaust fans, auxiliary rooms supply and exhaust fans. All the fans serving accommodation areas or supplying combustion air are not included in this group. This group does not include cargo hold fans, and garage supply and exhaust fans.

4.1.6 F - Air Conditioning services
All Loads that make up the air conditioning service that typically are: air conditioning chillers, air conditioning cooling and heating fluids transfer and treatment, air conditioning's air handling units ventilation, air conditioning re-heating systems with associated pumping, etc. The air conditioning chillers service factor of load, service factor of time and service factor of duty are to be set as 1 (kl=1, kt=1 and kd=1) in order to avoid the detailed validation of the heat load dissipation document (i.e. the chiller's electric motor rated power is to be used). However, kd is to represent the use of spare chillers (e.g. four chillers are installed and one out four is spare then kd=0 for the spare chiller and kd=1 for the remaining three chillers), but only when the number of spare chillers is clearly demonstrated via the heat load dissipation document.

4.1.7 G - Galleys, refrigeration and Laundries services
All Loads related to the galleys, pantries refrigeration and laundry services that typically are: Galleys various machines, cooking appliances, galleys' cleaning machines, galleys auxiliaries, refrigerated room systems including refrigeration compressors with auxiliaries, air coolers, etc.

4.1.8 H - Accommodation services
All Loads related to the accommodation services of passengers and crew that typically are: crew and passengers' transportation systems, i.e. lifts, escalators, etc., environmental services, i.e. black and grey water collecting, transfer, treatment, storage, discharge, waste systems including collecting, transfer, treatment, storage, etc., accommodation fluids transfers, i.e. sanitary hot and cold water pumping, etc., treatment units, pools systems, saunas, gym equipments, etc.

4.1.9 I - Lighting and socket services
All Loads related to the lighting, entertainment and socket services. As the quantity of lighting circuits and sockets within the ship may be significantly high, it is not practically feasible to list all the lighting circuits and points in the EPT for EEDI. Therefore circuits should be grouped into subgroups aimed to identify possible improvements of efficient use of power. The subgroups are:

  1. Lighting for 1) cabins, 2) corridors, 3) technical rooms/stairs, 4) public spaces/stairs, 5) engine-rooms and auxiliaries' room, 6) external areas, 7) garages and 8) cargo spaces. All have to be divided by main vertical zone; and

  2. Power sockets for 1) cabins, 2) corridors, 3) technical rooms/stairs, 4) public spaces/stairs, 5) engine-rooms and auxiliaries' room, 6) garages and 7) cargo spaces. All have to be divided by main vertical zone.

The calculation criteria for complex groups (e.g. cabin lighting and power sockets) subgroups are to be included via an explanatory note, indicating the load composition (e.g. lights of typical cabins, TV, hair dryer, fridge, etc., typical cabins).

4.1.10 L – Entertainment services
This group includes all Loads related to the entertainment services that typically are: public spaces audio and video equipments, theatre stage equipments, IT systems for offices, video games, etc.

4.1.11 N – Cargo Loads
This group will contain all cargo loads such as cargo pumps, cargo gear, maintaining cargo, cargo reefers loads, cargo hold fans and garage fans for sake of transparency. However, the service factor of this group is to be set to zero.

4.1.12 M – Miscellaneous
This group will contain all loads which have not been associated to the above-mentioned groups but still are contributing to the overall load calculation of the normal maximum sea load.

4.10 Service factor of duty "kd" [/]

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Service factor of duty "kd" [/]

4.10 Factor of duty is to be used when a function is provided by more than one load. As all loads have to be included in the EPT for EEDI, this factor provides a correct summation of the loads. For example when two pumps serve the same circuit and they run in duty/stand-by their Kd factor will be ½ and ½. When three compressors serves the same circuit and one runs in duty and two in stand-by, then kd is 1/3, 1/3 and 1/3.

4.11 Service factor of time "kt" [/]

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Service factor of time "kt" [/]

4.11 A factor of time based on the shipyard's evaluation about the load duty along 24 hours of ship's navigation as defined at paragraph 3. For example the Entertainment loads operate at their power for a limited period of time, 4 hours out 24 hours; as a consequence kt=4/24. For example, the seawater cooling pumps operate at their power all the time during the navigation at Vref. As a consequence kt=1.

4.12 Service total factor of use "ku" [/]

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Service total factor of use "ku" [/]

4.12 The total factor of use that takes into consideration all the service factors: ku=kl·kd·kt.

4.13 Loads necessary power "Pload" [kW]

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Loads necessary power "Pload" [kW]

4.13 The individual user contribution to the auxiliary load power is Pload=Pr·ku.

4.14 Notes

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Notes

4.14 A note, as free text, could be included in the document to provide explanations to the verifier.

4.15 Groups necessary power [kW]

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Groups necessary power [kW]

4.15 The summation of the "Loads necessary power" from group A to N. This is an intermediate step which is not strictly necessary for the calculation of PAE. However, it is useful to allow a quantitative analysis of the PAE, providing a standard breakdown for analysis and potential improvements of energy saving.

4.16 Auxiliaries load's power PAE [kW]

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Auxiliaries load's power PAE [kW]

4.16 Auxiliaries load's power PAE is the summation of the "Load's necessary power" of all the loads divided by the average efficiency of the generator(s) weighted by power.

PAE=SPload(i)/( average efficiency of the generator(s) weighted by power)

4.2 Loads description

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Loads description

4.2 This identifies the loads (for example "seawater pump").

4.3 Loads identification tag

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Loads identification tag

4.3 This tag identifies the loads according to the shipyard's standards tagging system. For example, the "PTI1 fresh water pump" identification tag is "SYYIA/C" for an example ship and shipyard. This data provides a unique identifier for each load.

4.4 Loads electric circuit Identification

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Loads electric circuit Identification

4.4 This is the tag of the electric circuit supplying the load. Such information allows the data validation process.

4.5 Loads mechanical rated power "Pm"

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Loads mechanical rated power "Pm"

4.5 This data is to be indicated in the document only when th electric load is made by an electric motor driving a mechanical load (for example a fan, a pump, etc.). This is the rated power of the mechanical device driven by an electric motor.

4.6 Loads electric motor rated output power [kW]

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Loads electric motor rated output power [kW]

4.6 The output power of the electric motor as per maker's name plate or technical specification. This data does not take part of the calculation but is useful to highlight potential over rating of the combination motor-mechanical load.

4.7 Loads electric motor efficiency "e" [/]

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Loads electric motor efficiency "e" [/]

4.7 This data is to be entered in the document only when the electric load is made by an electric motor driving a mechanical load.

4.8 Loads rated electric power "Pr" [kW]

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Loads rated electric power "Pr" [kW]

4.8 Typically the maximum electric power absorbed at the load electric terminals at which the load has been designed for its service, as indicated on the maker's name plate and/or maker's technical specification. When the electric load is made by an electric motor driving a mechanical load the load's rated electric power is: Pr=Pm/e [kW].

4.9 Service factor of load "kl" [/]

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Service factor of load "kl" [/]

4.9 Provides the reduction from the loads rated electric power to loads necessary electric power that is to be made when the load absorb less power than its rated power. For example, in case of electric motor driving a mechanical load, a fan could be designed with some power margin, leading to the fact that the fan rated mechanical power exceeds the power requested by the duct system it serves. Another example is when a pump rated power exceed the power needed for pumping in its delivery fluid circuit. Another example in case of electric self-regulating semi-conductors electric heating system is oversized and the rated power exceeds the power absorbed, according a factor kl.

5 Layout and organization of the data

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5 - Layout and organization of the data indicated in the "Electric power table for EEDI"

The document "Electric power table for EEDI" is to include general information (i.e. ship's name, project name, document references, etc.) and a table with:

  1. one row containing column titles;

  2. one Column for table row ID;

  3. one Column for the groups identification ("A", "B", etc.) as indicated in paragraphs 4.1.1 to 4.1.12 of this guideline;

  4. one Column for the group descriptions as indicated in paragraphs 4.1.1 to 4.1.12 of this guideline;

  5. one column each for items in paragraphs 4.2 to 4.14 of this guideline (e.g. "load tag", etc.);

  6. one row dedicated to each individual load;

  7. the summation results (i.e. summation of powers) including data from paragraphs 4.15 to 4.16 of this guideline; and

  8. explanatory notes.

An example of an Electric Power Table for EEDI for a cruise postal vessel which transports passenger and have a car garage and reefer holds for fish trade transportation is indicated
below. The data indicated and the type of ship is for reference only.

See Annex / Zie bijlage

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