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Национальный университет кораблестроения им. адм. Макарова

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s90mec7

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MAN B&W	2.05

Page of 1

Diagram for actual project

This figure contains a layout diagram that can be used for constructing the load diagram for an actual project, using the % figures stated and the inclinations of the lines.

			!æ		!æ
				!æ	æ
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æ æ æ

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178 37 73-2.2

Fig. 2.05.01: Construction of layout diagram

MAN B&W S90MC-C/ME-C7

MAN Diesel	198 41 58-6.1

MAN B&W	2.06

	Page of 1

Specific Fuel Oil Consumption, ME versus MC engines

As previously mentioned the main feature of the ME engine is that the fuel injection and the exhaust valve timing are optimised automatically over the entire power range, and with a minimum speed down to around 15% of the L1 speed.

Comparing the specific fuel oil comsumption (SFOC) of the ME and the MC engines, it can be seen from the figure below that the great advantage of the ME engine is a lower SFOC at part loads.

It is also noted that the lowest SFOC for the ME engine is at 70% of O, whereas it was at 80% of O for the MC engine.

For the ME engine only the turbocharger matching and the compression ratio (shims under the piston rod) remain as variables to be determined by the engine maker / MAN Diesel.

The calculation of the expected specific fuel oil consumption (SFOC) can be carried out by means of the following figures for fixed pitch propel-

ler and for controllable pitch propeller, constant speed. Throughout the whole load area the SFOC of the engine depends on where the matching point (O) is chosen.

SFOC g/kWh

0 -1

-2

-3

-4 ME

-5 50% 60% 70% 80% 90% 100% 110%

Engine power, % of matching point O

198 97 38 9.2

Fig. 2.06.01: Example of part load SFOC curves for ME and MC with fixed pitch propeller

MAN B&W ME/ME-C/ME-GI

MAN Diesel	198 38 36-3.3

MAN B&W	2.07

	Page of 1

SFOC for High Efficiency/Conventional Turbochargers

This section is not applicable

MAN Diesel	198 53 11-3.0

MAN B&W	2.08

SFOC reference conditions and guarantee

SFOC at reference conditions

The SFOC is given in g/kWh based on the reference ambient conditions stated in ISO 3046:2002(E) and ISO 15550:2002(E):

1,000 mbar ambient air pressure

25 °C ambient air temperature

25 °C scavenge air coolant temperature

and is related to a fuel oil with a lower calorific value of 42,700 kJ/kg (~10,200 kcal/kg).

Any discrepancies between g/kWh and g/BHPh are due to the rounding of numbers for the latter.

For lower calorific values and for ambient conditions that are different from the ISO reference conditions, the SFOC will be adjusted according to the conversion factors in the table below.

		With	Without
		pmax	pmax
		adjusted	adjusted
	Condition	SFOC	SFOC
Parameter	change	change	change
Scav. air coolant	per 10 °C rise	+ 0.60%	+ 0.41%
temperature
Blower inlet tem-	per 10 °C rise	+ 0.20%	+ 0.71%
perature
Blower inlet	per 10 mbar	0.02%	0.05%
pressure	rise	0.02%	0.05%
pressure	rise
Fuel oil lower	rise 1%	1.00%	1.00%
calorific value	(42,700 kJ/kg)	1.00%	1.00%

With for instance 1 °C increase of the scavenge air coolant temperature, a corresponding 1 °C increase of the scavenge air temperature will occur and involves an SFOC increase of 0.06% if pmax is adjusted to the same value.

Page of 2

SFOC guarantee

The SFOC guarantee refers to the above ISO reference conditions and lower calorific value. It is guaranteed for the power speed combination in the matching point (O) and the engine running ‘Fuel economy mode’ in compliance with IMO NOx emission limitations.

The SFOC guarantee is given with a tolerance of 5%

Recommended cooling water temperature during normal operation

In general, it is recommended to operate the main engine with the lowest possible cooling water temperature to the air coolers, as this will reduce the fuel consumption of the engine, i.e. the engine performance will be improved.

However, shipyards often specify a constant (maximum) central cooling water temperature of 36 °C, not only for tropical ambient temperature conditions, but also for lower ambient temperature conditions. The purpose is probably to reduce the electric power consumption of the

cooling water pumps and/or to reduce water condensation in the air coolers.

Thus, when operating with 36 °C cooling water instead of for example 10 °C (to the air coolers), the specific fuel oil consumption will increase by approx. 2 g/kWh.

MAN B&W ME/ME-C/ME-GI/ME-B engines K98MC/MC-C6/7, S90MC-C7/8, K90MC-C6, S80MC6, S80MC-C7/8, K80MC-C6, S70MC6, S60MC6, S50MC6, S46MC-C6/7, S42MC7, S35MC7, L35MC6, S26MC6

MAN Diesel

198 68 15-2.0

MAN B&W	2.08

	Page of 2

Examples of graphic calculation of SFOC

The following diagrams b and c valid for fixed pitch propeller and constant speed, respectively, show the reduction of SFOC in g/kWh, relative to the SFOC for the nominal MCR L1 rating.

The solid lines are valid at 100, 70 and 50% of the matching point (O).

Point O is drawn into the above mentioned Diagram b or c. A straight line along the constant mep curves (parallel to L1 L3) is drawn through point O. The intersections of this line and the curves indicate the reduction in specific fuel oil consumption at 100, 70 and 50% of the matching point, related to the SFOC stated for the nominal MCR L1 rating.

An example of the calculated SFOC curves for an engine with fixed pitch propeller are shown in Diagram a, and are valid for two alternative engine ratings:

•Matching point O1, at 100% of M

•Matching point O2 at 90% of M See fig. 2.10.01.

90% is a typical chosen matching point, randomly chosen between 85 100% in order to reduce SFOC at part load running.

MAN B&W ME/ME-C/ME-GI engines

MAN Diesel	198 38 37-5.5

MAN B&W Diesel A/S				2.09

					Page 1 of 2
SFOC Calculations for S90ME-C

Data at nominel MCR (L1)				SFOC at nominal MCR (L1)
Engine	kW		r/min		g/kWh
6S90ME-C	29,340		76		167


Data matching point (O):

Power: 100% of (O)		kW

Speed: 100% of (O)		r/min

SFOC found:		g/kWh

SFOC				Diagram a
SFOC
g/kWh			Part Load SFOC curve
+4
+4
+3
+3
+2
+2
+1
+1
0				Nominal SFOC
0				Nominal SFOC
-1
-1
-2
-2
-3
-3
-4
-4
-5
-5
-6
-6
-7
-7
-8
-8
-9
-9
-10
-10
-11
-11
-12
-12
-13
-13
-14
-14
-15
-15
-16
-16
40%	50%	60%		70%	80%	90%	100%	110%
						% of specified MCR

178 23 44-9.1

Fig. 2.09.01: SFOC for S90ME-C

S90ME-C

198 43 31-1.0

MAN B&W Diesel A/S	2.09

Page 2 of 2

SFOC for S90ME-C with fixed pitch propeller

																																																														Power, % of L1
																																																				=0.15							eed	lines
																																														=0.20													eed	lines
																																														=0.20										ant		ship sp
																																																				=0.20	=0.20		onst							100%
																																																				=0.20	=0.20	C								100%
																																																														90%
Diagram b																																						l	in		L1
																																						l	in
																																					a
																																			in									t																		80%
																																		m										t
																																	o										in
																														e		n									o
																														e									gp
																											to		th									in
																										e	to									h
																										e									tc													p
																							tiv											a														p
																							tiv										m													e
																					la									%															m
																				e										%
																			h	r									0
																			h									0
																	W									t		1																				%														70%
																/k										t																					0															70%
																g									in																			-7	0
														in									o																					-7	1
												C		in						g		p																		-5		-6							%
												C								g																						-6							%
											O								in																			4										5
										F								h																				4								9
									f	S							tc																			-3		-
									f							a																				-3
							n	o					%		m																			-2																%
						tio							%																			-1																	0
						tio						0																				-1																9
				c								7																			0
			u																												0
		d								g
e										g																																									%
R									in																	-12																									%											60%
R								h																		-12																								5												60%
							tc																		11																								8
						a																		-
					m																-10
		%																		9																																%
	0																		8																																0
5					t									5		-6	-7	-																																8
					t											-6	-7
			in
		o												-
p										-6	-7
							-4	-5			-7
																																																														50%
						-3
			-2
																																																						Nominal propeller curve


																																																														40%
																																																					75%	80%			85%		90%	95%	100%	105%
																																																														Speed, % of L1

178 26 92-3.0

Fig. 2.09.02

SFOC for S90ME-C with constant speed

Diagram b

tiv

-7

-5

-3

-2

tio

-1

-12

-10

-6

-7

-5

-6

-3

-4

-2

-1

																	Power, % of L1
							=0.15							eed	lines
	=0.20													eed	lines
	=0.20										ant		ship sp
							=0.20	=0.20		onst							100%
							=0.20	=0.20	C								100%
																	90%
																	80%
			p
	e
m																	70%
		0															70%
0			%
1				%
			5
	9				%
				0
			9														60%
				8		%											60%
					5
							%
						0
					8
																	50%
																	40%
								75%	80%			85%		90%	95%	100%	105%
																	Speed, % of L1

178 26 93-5.0

Fig. 2.09.03

S90ME-C

198 43 31-1.0

MAN B&W Diesel A/S	2.10

SFOC calculations, example

Data at nominel MCR (L1): 6S90ME-C

Power 100%	29,340 kW

Speed 100%	76 r/min

Nominal SFOC:

High efficiency turbocharger	167 g/kWh

Page 1 of 2

Data of specified MCR =	M1	M2
Power	24,939	22,445	kW

Speed	73.7	71.2	r/min

SFOC found:	162.8	160.7	g/kWh

M1 power is selected as 85% of L1 = 24,939 kW M1 speed is selected as 97% of L1 = 73.7 r/min

M2 is in this example selected on the same propeller curve as M1

If the power of M2 were selected as 76.5% of L1 = 22,445 kW and the corresponding speed is 93.7% of that in L1 = 71.2 r/min

The savings in g/kWh compared to SFOC in L1:

Power in			Matching point		SFOC
					saving


M1	= 85%	1	85% x 100% = 85.0%		4.2
		2	85% x 70% = 59.5%		9.2
	of L1
		3	85% x 50%	= 42.5%	5.1

M2 = 76.5%		4	76.5% x 100%	= 76.5%	6.3
		5	76.5% x 70%	= 53.6%	11.3
	of L1
		6	76.5% x 50%	= 38.3%	6.8

Diagram a

SFOC

g/kWh Part Load SFOC curve +4

0								Nominal SFOC
0								Nominal SFOC
-1
-1
-2
-2
-3
-3											M1
-4											M1
-4											1
											1
-5
-5	3
	3
-6
-6	6								M2	4
-7	6								M2	4
-7
-8
-8
-9
-9					2
-10					2


-11
-11					5
-12					5


-13
-13
-14
-14
-15
-15
-16
-16	40%			50%	60%			70%		80%	90%			100%	110%
30%	40%			50%	60%			70%		80%	90%			100%	110%
													% of specified MCR
			42.5				59.5					85
			42.5				59.5					85

		38.3				53.6				76.5

178 50 89-0.0

Fig. 2.10.01: Examples of SFOC for different specified MCR points for 6S90ME-C with fixed pitch propeller, high efficiency turbocharger

S90ME-C

198 42 81-8.0

MAN B&W Diesel A/S	2.10

Page 2 of 2

Example of matching point

																																																									Power, % of L1
																																															=0.15							eed	lines
																																											=0.20											eed	lines
																																											=0.20								ant		ship sp
																																															=0.20	=0.20		onst							100%
																																															=0.20	=0.20	C								100%
																																																							M1		90%
																																																							M1
Diagram b																																inal				in			L1
																																				in					t																80%

																														m																									M2
																												e		no									oin																M2
																												e								g		p
																											h									g
																										o	t								in
																										o								h
																								e	t							c
																								e							t													p
																							iv							a														p
																						t								m													e
																				la								%														m
																			e									%
																	h		r								0
																	h									0
															/kW									t		1																		0%													70%
															g								in																		-7	0
														in								o																			-7	1
											C			in					g		p																-5			-6					%
											C								g																					-6					%
										O								in																	4									5
									F								h																		4								9
								f	S							tc																	-3		-
								f							a																		-3
						n		o						m																-2																%
						n							%																	-2																%
					tio								%																	-1															0
					tio							0																		-1														9
			c								7																		0
		u																											0
	d								g
e									g															-12																					85%												60%
R							chin																	-12																					85%												60%
						t																	-11																1
					a															-10																			1
				m																-10
	%																		9																												%
50																		8																							4					0
50				t										5	-6	-7	-																								4					8
																-7

		in
	o													-
p									-6	-7													2
						-4		-5		-7
																																																									50%
					-3																						5
		-2
																																																	Nominal propeller curve

									3
									3
													6
																																																									40%
																																																75%	80%			85%		90%	95%	100%	105%
																																																									Speed, % of L1

178 50 88-9.0

Fig. 2.10.02: SFOC for engine with fixed pitch propeller and matching point at 85% L1

Diagram b

tiv

-7

-5

-3

-2

tio

-1

-12

-10

-6

-7

-5

-6

-3

-4

-2

-1

																	Power, % of L1
							=0.15							eed	lines
	=0.20													eed	lines
	=0.20										ant		ship sp
							=0.20	=0.20		onst							100%
							=0.20	=0.20	C								100%
																	90%
																	80%
			p
	e
m																	70%
		0															70%
0			%
1				%
			5
	9				%
				0
			9														60%
				8		%											60%
					5
							%
						0
					8
																	50%
																	40%
								75%	80%			85%		90%	95%	100%	105%
																	Speed, % of L1

178 26 93-5.0

Fig. 2.10.03: SFOC for engine with constant speed

S90ME-C

198 42 80-6.0

MAN B&W	2.11

	Page of 1

Fuel Consumption at an Arbitrary Load

Once the matching point (O) of the engine has been chosen, the specific fuel oil consumption at an arbitrary point S1, S2 or S3 can be estimated based on the SFOC at point ‘1’ and ‘2’.

These SFOC values can be calculated by using the graphs for the relevant engine type for the propeller curve I and for the constant speed curve II, giving the SFOC at points 1 and 2, respectively.

Next the SFOC for point S1 can be calculated as an interpolation between the SFOC in points ‘1’ and ‘2’, and for point S3 as an extrapolation.

The SFOC curve through points S2, on the left of point 1, is symmetrical about point 1, i.e. at speeds lower than that of point 1, the SFOC will also increase.

The above mentioned method provides only an approximate value. A more precise indication of the expected SFOC at any load can be calculated by using our computer program. This is a service which is available to our customers on request.

		0OWER OF ! -

	!-




3	3	3


)	))


		3PEED OF !

198 95 96 2.2

Fig. 2.11.01: SFOC at an arbitrary load

MAN B&W ME/ME-C/ME-GI/ME-B engines

MAN Diesel	198 38 43-4.4

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