Chapter 6 Cooling Water System
4. Heat Exchanger
4LHA Series
4.
Heat
Exchanger
4-1
Heat
exchanger
construction
The
heat exchanger cools the hot fresh water
that
has
cooled
the inside of the engine
with
sea
water.
The
inside of the heat exchanger cooling pipe consists of
36 small
dia.
tubes and baffle plates.
The
sea
water flows through the small dia tubes and the
fresh water flows through the maze formed by the baffle
plates.
There
is a reservoir at the bottom of the cooling pipe which
serves
as the fresh water tank. There is an exhaust water
passageway
(line) in the resenroir which forms a water
cooled
exhaust gas manifold.
The
filler cap on top of the heat exchanger has a pressure
valve,
which lets off steam through the overflow pipe
when pressure in the fresh water system exceeds the
specified
value. It also takes in air from the overflow pipe
when pressure in the fresh water system drops below the
normal value.
Filler
cap
6-10
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