MAN B&W S65ME-C8.2-GI-TII, Project Manual

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MAN B&W 6.04
Page 11 of 12
MAN Diesel MAN B&W S65ME-C8.2-GI-TII 198 88 45-0.1
Calculation of Exhaust Data for Derated Engine
Example 3:
Expected exhaust gas data for a derated 6S65ME-C8.2-GI-TII with 1 high efficiency MAN TCA77-21
turbocharger , high load and fixed pitch propeller.
Based on the engine ratings below, and by means of an example, this chapter will show how to calculate
the expected exhaust gas amount and temperature at service rating, and for a given ambient reference
condition different from ISO.
The calculation is made for the service rating (S) of the diesel engine being 80% of the specified MCR.
Note:
This calculation is based on fuel oil. When operating the ME-GI on fuel gas, the amount of exhaust gas
is higher and the temperature lower in any MCR depending on the actual type of fuel gas. Such calcula-
tions are beyond the scope of this project guide and can be made in CEAS, see Section 20.02.
Nominal MCR, (L
1
) P
L1
: 17,220 kW (100.0%) and 95.0 r/min (100.0%)
Specified MCR, (M) P
M
: 15,498 kW (90.0%) and 90.3 r/min (95.0%)
Service rating, (S) P
S
: 12,398 kW and 83.8 r/min, P
S
= 80.0% of P
M
Reference conditions
Air temperature T
air
.............................................................. 20° C
Scavenge air coolant temperature T
CW
............................... 18° C
Barometric pressure p
bar
...................................................... 1,013 mbar
Exhaust gas backpressure at specified MCR
Δ
p
M
............ 300 mm WC