9.3.6 Temperature control valve for heat recovery (4V02)
The temperature control valve after the heat recovery controls the maximum temperature of the water that
is mixed with HT water from the engine outlet before the HT pump. The control valve can be either self-
actuated or electrically actuated.
The set-point is usually somewhere close to 75 ºC.
9.3.7 Coolers for other equipment and MDF coolers
The engine driven LT circulating pump can supply cooling water to one or two small coolers installed in
parallel to the engine, for example a MDF cooler or a reduction gear cooler. This is only possible for engines
operating on MDF, because the LT temperature control valve cannot be built on the engine to control the
temperature after the engine. Separate circulating pumps are required for larger flows.
Design guidelines for the MDF cooler are given in chapter Fuel system.
9.3.8 Fresh water central cooler (4E08)
Design data:
see chapter Technical DataFresh water flow
see chapter Technical DataHeat to be dissipated
max. 60 kPa (0.6 bar)Pressure drop on fresh water side
acc. to cooler manufacturer, normally 1.2 - 1.5 x the fresh water flowSea-water flow
acc. to pump head, normally 80 - 140 kPa (0.8 - 1.4 bar)Pressure drop on sea-water side, norm.
max. 38°CFresh water temperature after cooler
15%Margin (heat rate, fouling)
Figure 9.7 Central cooler main dimensions. Example for guidance only
Weight [kg]D [mm]C [mm]B [mm]A [mm]Number of cylinders
120021507004257206
123021507004257209
1250215070042572012
1310215095042572016
As an alternative for the central coolers of the plate or of the tube type a box cooler can be installed. The
principle of box cooling is very simple. Cooling water is forced through a U-tube-bundle, which is placed
in a sea-chest having inlet- and outlet-grids. Cooling effect is reached by natural circulation of the surrounding
Product Guide Wärtsilä 34DF - 3/2012 93
Product Guide
9. Cooling Water System
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