39
Turbocharger
The turbocharger (TC) unit consists of an exhaust tur-
bine, bearing housing and compressor.
The turbine wheel is rotated by the stream of exhaust
gas entering the turbine housing on its way to the ex-
haust system. The turbine wheel, which is on a common
shaft with the compressor, drives the compressor
wheel. The compressor wheel is located in a compres-
sor housing which is connected between the air pipe
from the air cleaner (ACL) and the engines intake pipe.
Air is sucked in by the compressor wheel from the from
the air cleaner (ACL) and then compressed and forced
in to the engine cylinders at charge pressure after pass-
ing through the seawater-cooled charge air cooler
(CAC). The larger volume of air means that the amount
of fuel that can be injected is greater and the fuel com-
bustion process is more effective. This results in greater
engine output, lower specific fuel consumption and
cleaner emissions.
The turbocharger is lubricated and cooled by the en-
gine’s lubrication system. An external oil line connection
supplies and removes the oil required. The turbine
housing is cooled by freshwater.
Charge air cooler (CAC)
The intake air enters the charge air cooler (CAC) after
compression in the turbocharger. The charge air cooler
lowers the temperature of the air and thereby consider-
ably improves the output ratio as the volume of the air is
reduced. More air (oxygen) can therefore be forced into
the engine’s cylinders and burn more fuel per compres-
sion stroke; thus increasing output. Charge air cooling
also helps reduce the thermal load on the engine.
Turbocharger (TC) and charge air cooler (CAC)
1.
Seawater (inlet)
2.
Seawater (outlet)
3.
Intake pipe with charge air cooler (CAC)
4.
Turbocharger (freshwater cooling)
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