Calculation of List of Capacities and Exhaust Gas Data
Updated engine and capacities data is available
from the CEAS program on www.marine.man.eu
→ ’Two-Stroke’ → ’CEAS Engine Calculations’.
This chapter describes the necessary auxiliary ma-
chinery capacities to be used for a nominally rated
engine. The capacities given are valid for seawater
cooling system and central cooling water system,
respectively. For derated engine, i.e. with a speci-
fied MCR different from the nominally rated MCR
point, the list of capacities will be different from the
nominal capacities.
Furthermore, among others, the exhaust gas data
depends on the ambient temperature conditions.
Based on examples for a derated engine, the way
of how to calculate the derated capacities, fresh-
water production and exhaust gas amounts and
temperatures will be described in details.
Nomenclature
In the following description and examples of the auxiliary machinery capacities, freshwater generator pro-
duction and exhaust gas data, the below nomenclatures are used:
Fig. 6.01.01: Nomenclature of basic engine ratings
Fig. 6.01.02: Nomenclature of coolers and volume flows, etc.
Engine configurations related to SFOC
The engine type is available in the following ver-
sion only with respect to the efficiency of the tur-
bocharger:
With high efficiency turbocharger, which is the
basic design and for which the lists of capacities
Section 6.03 are calculated.
Engine ratings Point / Index Power Speed
Nominal MCR point L
1
P
L1
n
L1
Specified MCR point M P
M
n
M
Service point S P
S
n
S
Parameters
Q = Heat dissipation
V = Volume flow
M = Mass flow
T = Temperature
Cooler index
air scavenge air cooler
lub lube oil cooler
jw jacket water cooler
cent central cooler
Flow index
sw seawater flow
cw cooling/central water flow
exh exhaust gas
fw freshwater
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