Marine Installation Manual
2021-08
4-4
4 Ancillary Systems
4.2 Cooling water system
X72DF
4.2
Cooling water system
The latest version of the
Marine Installation Drawing Set
relevant for the
cooling water system (DG 9721) is provided on the WinGD webpage under the
following link:
Freshwater cooling
system
The main engine high-temperature (HT) and low-temperature (LT) cooling cir
-
cuits use freshwater as their cooling medium. As such, the HT and LT circuits
are integrated in the ship’s central freshwater cooling system.
Advantage of freshwater
over seawater
Freshwater cooling systems reduce the amount of seawater pipework and its as
-
sociated problems like scaling and corrosion. Freshwater provides for more effi
-
cient cooling as it allows a higher heat load than seawater, i.e. freshwater can be
heated up to a higher temperature level and, along with a lower flow rate, allows
the same cooling effect to be obtained. Thereby the overall running costs are re
-
duced.
Separate HT circuit
with own cooler
The central freshwater cooling system for the WinGD X72DF runs with
single-stage scavenge air cooler and separate HT circuit. The HT circuit must be
completely separate from the LT circuit. A dedicated HT water cooler is applied
for heat exchange between HT and LT circuit without flow medium mixing.
shows the general installation principle.
Figure 4
-
2 Separate HT cooling water circuit
NOTE
For detailed cooling design and the necessary data for this arrange
-
ment please refer to MIDS and GTD respectively.
SM-0106
HT circuit
LT circuit
freshwater
Cylinder cooling
water cooler
