The fresh water cooling system is divided into a high temperature (HT) and a low temperature
(LT) circuit. The HT water circulates through cylinder jackets, cylinder heads and the 1st stage
of the charge air cooler, while the LT water circulates through the 2nd stage of the charge air
cooler and through the lubricating oil cooler.
A two-stage charge air cooler enables more efficient heat recovery and heating of cold
combustion air.
Temperature control valves regulate the temperature of the water out from the engine, by
circulating some water back to the cooling water pump inlet. The HT temperature control valve
is mounted on the engine, while the LT temperature control valve is mounted in the external
LT circuit after the engine. The LT temperature control valve (4V09) is electrically controlled
for exact adjustment of the charge air receiver temperature.
9.2.1
Engine driven circulating pumps
The LT and HT cooling water pumps are engine driven. The engine driven pumps are located
at the free end of the engine.
Pump curves for engine driven pumps are shown in the diagrams. The nominal pressure and
capacity can be found in the chapter Technical data.
Fig 9-3
Pump curves for engine driven HT- and LT- water pumps
9-4
Wärtsilä 34DF Product Guide - a16 - 23 September 2016
Wärtsilä 34DF Product Guide
9. Cooling Water System
Summary of Contents for WARTSILA 34DF
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