Man B&W L35MC6-TII - Correction of Exhaust Gas Data for Ambient Conditions

MAN B&W 6.04
Page 9 of 12
MAN Diesel
MAN B&W S46MC-C8, S42MC7, S35MC7,
L35MC6, S26MC6
198 63 69-4.0
∆m
M%
: change of specific exhaust gas amount, in
% of specific gas amount at nominal MCR
(L
1
), see Fig. 6.04.07.
∆T
M
: change in exhaust gas temperature after
turbocharger relative to the L1 value, in °C,
see Fig. 6.04.08. (P
O
= P
M
)
∆T
O
: extra change in exhaust gas temperature
when optimising point O lower than 100% M:
P
O%
= (P
O
/P
M
) x 100%.
∆T
O
=  0.3 x (100  P
O%
) = 0 [6]
as P
O%
= 100 for this engine type
b) Correction for actual ambient conditions and
backpressure
For ambient conditions other than ISO
3046-1:2002 (E) and and backpressure other
than 300 mm WC at specified MCR point (M),
the correction factors stated in the table in
Fig. 6.04.09 may be used as a guide, and the
corresponding relative change in the exhaust
gas data may be found from equations [7] and
[8], shown in Fig. 6.04.10.
Parameter Change
Change of
exhaust gas
temperature
Change of
exhaust gas
amount
Blower inlet temperature + 10° C + 16.0° C  4.1 %
Blower inlet pressure (barometric pressure) + 10 mbar  0.1° C + 0.3 %
Charge air coolant temperature (seawater temperature) + 10° C + 1.0° C + 1.9 %
Exhaust gas back pressure at the specified MCR point + 100 mm WC + 5.0° C 1.1 %
Fig. 6.04.09: Correction of exhaust gas data for ambient conditions and exhaust gas back pressure
∆m
M%
= 14 x ln (P
M
/P
L1
) – 24 x ln (n
M
/n
L1
)
Fig. 6.04.07: Change of specific exhaust gas amount,
∆m
M%
in % of L
1
value and independent of P
O
∆T
M
= 15 x ln (P
M
/P
L1
) + 45 x ln (n
M
/n
L1
)
Fig. 6.04.08: Change of exhaust gas temperature, ∆T
M
in point M, in °C after turbocharger relative to L
1
value
178 51 11-7.2
178 51 13-0.2
L
4
L
1
L
3
L
2
P
M%
M
110%
100%
90%
80%
70%
80% 85% 90% 95%
M%
Specified MCR engine speed, % of L
1
60%
105% 100% 110%
n
Specified MCR power, % of L
1
0 °C
∆T
m
10 °C
8 °C
6 °C
4 °C
12 °C
2 °C
L
2
L
4
L
1
L
3
P
M%
110%
100%
90%
80%
70%
80% 85% 90% 95%
M%
Specified MCR engine speed, % of L
1
60%
105% 100% 110%
n
∆m
M%
M
1%
0%
1%
2%
3%
Specified MCR power, % of L
1