MAN B&W L28/32H, Руководство пользователя

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08028-0D\H5250\94.08.12
B 13 00 0
The charge air cooler and the lubricating oil cooler are
siuated parallelly in order to have the lowest possible
cooling water inlet temperature for both coolers.
The HT-circuit is cooled by adjustment of water from
the LT-circuit, taken from the lubricating oil cooler
outlet. Thus the amount of cooling water through the
cooling system is always adjusted to the engine load.
High Temperature Circuit
The built-on engine driven HT-circulating pump of the
centrifugal type, pumps water through a distributing
pipe to bottom of the cooling water space between
the liner and the frame of each cylinder unit. The water
is led out through bores in the top of the frame via the
cooling water guide jacket to the bore cooled cylinder
head for cooling of this and the valve seats.
From the cylinder heads the water is led through a
common outlet pipe to the thermostatic valve, and
depending on the engine load, a smaller or larger
amount of the water will be led to the external system
or be re-circulated.
Internal Cooling Water System 1
L28/32H
99.48
1613443-9.2
Page 2 (2)
Optionals
Alternatively the engine can be equipped with the
following:
– Thermostatic valve on outlet LT-system
– Engine driven pump for LT-system
– Preheater arrangement in HT-system
Branches for:
– External preheating
– Alternator cooling
If the alternator is cooled by water, the pipes for this
can be integrated on the GenSet.
Data
For heat dissipation and pump capacities,
See D 10 05 0, "List of Capacities".
Set points and operating levels for temperature and
pressure are stated in B 19 00 0, "Operating Data and
Set Points".
Other design data are stated in B 13 00 0, "Design
Data for the External Cooling Water System".