4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
11 0
E
n
g
in
e
t
h
e
rm
a
l e
ff
ic
ie
n
c
y
i
n
%
Engine load in % MCR
V TA
B yp as s
∆η
=1%
MCR Maximum Continuous Rating
Figure 5: Improvement of the thermal efficiency with a TCA55-41V on an 7L51/60DF engine
1.3
Low-speed propulsion engines from MAN B&W
The following tables summarize the fuel-saving potential existing for
MAN B&W engines. All SFOC values refer to the SFOC for a load of 100%
for a standard L
1
engine.
SFOC-optimized load range
Tuning method
SFOC change [g/kWh]
35%
50%
65%
80%
100%
High load (85-100%)
Standard L
1
engine
3.5
-1
-3.5
-3.5
0
Partial load (50-85%)
VTA
0.5
-4
-6.5
-4.5
0.5
Low load (25-70%)
VTA
-1.5
-6
-8.5
-3.5
0.5
Standard L
1
engine – turbocharger without adjustable turbine nozzle ring
VTA – turbocharger with adjustable turbine nozzle ring
Table 8: Optimization potential – ME/ME-C Tier II engines, SMCR = L
1
2013-12-04 - de
1 Adjustable turbine nozzle ring (VTA)
1.3 Low-speed propulsion engines from MAN B&W
MAN Diesel & Turbo
1
EN-US
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